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annotate src/process-unix.c @ 5697:40fbceabaafd
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| author | Stephen J. Turnbull <stephen@xemacs.org> |
|---|---|
| date | Mon, 24 Dec 2012 03:08:33 +0900 |
| parents | 56144c8593a8 |
| children | a216b3c2b09e |
| rev | line source |
|---|---|
| 428 | 1 /* Asynchronous subprocess implementation for UNIX |
| 2 Copyright (C) 1985, 1986, 1987, 1988, 1992, 1993, 1994, 1995 | |
| 3 Free Software Foundation, Inc. | |
| 4 Copyright (C) 1995 Sun Microsystems, Inc. | |
| 1330 | 5 Copyright (C) 1995, 1996, 2001, 2002, 2003 Ben Wing. |
| 428 | 6 |
| 7 This file is part of XEmacs. | |
| 8 | |
|
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9 XEmacs is free software: you can redistribute it and/or modify it |
| 428 | 10 under the terms of the GNU General Public License as published by the |
|
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11 Free Software Foundation, either version 3 of the License, or (at your |
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12 option) any later version. |
| 428 | 13 |
| 14 XEmacs is distributed in the hope that it will be useful, but WITHOUT | |
| 15 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 17 for more details. | |
| 18 | |
| 19 You should have received a copy of the GNU General Public License | |
|
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20 along with XEmacs. If not, see <http://www.gnu.org/licenses/>. */ |
| 428 | 21 |
| 771 | 22 /* Mule-ized as of 6-14-00 */ |
| 428 | 23 |
| 24 /* This file has been split into process.c and process-unix.c by | |
| 25 Kirill M. Katsnelson <kkm@kis.ru>, so please bash him and not | |
| 26 the original author(s) */ | |
| 27 | |
| 440 | 28 /* The IPv6 support is derived from the code for GNU Emacs-20.3 |
| 29 written by Wolfgang S. Rupprecht */ | |
| 30 | |
| 428 | 31 #include <config.h> |
| 32 | |
| 33 #include "lisp.h" | |
| 34 | |
| 35 #include "buffer.h" | |
| 36 #include "events.h" | |
| 37 #include "frame.h" | |
| 38 #include "hash.h" | |
| 39 #include "lstream.h" | |
| 40 #include "opaque.h" | |
| 41 #include "process.h" | |
| 42 #include "procimpl.h" | |
| 43 #include "sysdep.h" | |
| 44 #include "window.h" | |
| 45 #include "file-coding.h" | |
| 46 | |
| 47 #include <setjmp.h> | |
| 853 | 48 #include "sysdir.h" |
| 428 | 49 #include "sysfile.h" |
| 50 #include "sysproc.h" | |
| 859 | 51 #include "syssignal.h" |
| 428 | 52 #include "systime.h" |
| 53 #include "systty.h" | |
| 54 #include "syswait.h" | |
| 55 | |
| 442 | 56 #ifdef HPUX |
| 57 #include <grp.h> /* See grantpt fixups for HPUX below. */ | |
| 58 #endif | |
| 428 | 59 |
| 502 | 60 #if defined (HAVE_GETADDRINFO) && defined (HAVE_GETNAMEINFO) |
| 61 #define USE_GETADDRINFO | |
| 62 #endif | |
| 63 | |
| 64 | |
| 428 | 65 /* |
| 66 * Implementation-specific data. Pointed to by Lisp_Process->process_data | |
| 67 */ | |
| 68 | |
| 69 struct unix_process_data | |
| 70 { | |
| 71 /* Non-0 if this is really a ToolTalk channel. */ | |
| 72 int connected_via_filedesc_p; | |
| 73 /* Descriptor by which we read from this process. -1 for dead process */ | |
| 74 int infd; | |
| 853 | 75 /* Descriptor by which we read stderr from this process. -1 for |
| 76 dead process */ | |
| 77 int errfd; | |
| 428 | 78 /* Descriptor for the tty which this process is using. |
| 79 -1 if we didn't record it (on some systems, there's no need). */ | |
| 80 int subtty; | |
| 81 /* Non-false if communicating through a pty. */ | |
| 82 char pty_flag; | |
| 83 }; | |
| 853 | 84 #define UNIX_DATA(p) ((struct unix_process_data*) ((p)->process_data)) |
| 428 | 85 |
| 86 | |
| 87 | |
| 88 /**********************************************************************/ | |
| 89 /* Static helper routines */ | |
| 90 /**********************************************************************/ | |
| 91 | |
| 92 static SIGTYPE | |
| 2286 | 93 close_safely_handler (int SIG_ARG_MAYBE_UNUSED (signo)) |
| 428 | 94 { |
| 95 EMACS_REESTABLISH_SIGNAL (signo, close_safely_handler); | |
| 96 SIGRETURN; | |
| 97 } | |
| 98 | |
| 99 static void | |
| 100 close_safely (int fd) | |
| 101 { | |
| 102 stop_interrupts (); | |
| 613 | 103 set_timeout_signal (SIGALRM, close_safely_handler); |
| 428 | 104 alarm (1); |
| 771 | 105 retry_close (fd); |
| 428 | 106 alarm (0); |
| 107 start_interrupts (); | |
| 108 } | |
| 109 | |
| 110 static void | |
| 111 close_descriptor_pair (int in, int out) | |
| 112 { | |
| 113 if (in >= 0) | |
| 771 | 114 retry_close (in); |
| 428 | 115 if (out != in && out >= 0) |
| 771 | 116 retry_close (out); |
| 428 | 117 } |
| 118 | |
| 119 /* Close all descriptors currently in use for communication | |
| 120 with subprocess. This is used in a newly-forked subprocess | |
| 121 to get rid of irrelevant descriptors. */ | |
| 122 | |
| 123 static int | |
| 2286 | 124 close_process_descs_mapfun (const void *UNUSED (key), void *contents, |
| 125 void *UNUSED (arg)) | |
| 428 | 126 { |
| 5013 | 127 Lisp_Object proc = GET_LISP_FROM_VOID (contents); |
| 853 | 128 USID vaffan, culo; |
| 129 | |
| 130 event_stream_delete_io_streams (XPROCESS (proc)->pipe_instream, | |
| 131 XPROCESS (proc)->pipe_outstream, | |
| 132 XPROCESS (proc)->pipe_errstream, | |
| 133 &vaffan, &culo); | |
| 428 | 134 return 0; |
| 135 } | |
| 136 | |
| 137 void | |
| 138 close_process_descs (void) | |
| 139 { | |
| 140 maphash (close_process_descs_mapfun, usid_to_process, 0); | |
| 141 } | |
| 142 | |
| 143 /* connect to an existing file descriptor. This is very similar to | |
| 144 open-network-stream except that it assumes that the connection has | |
| 145 already been initialized. It is currently used for ToolTalk | |
| 146 communication. */ | |
| 147 | |
| 148 /* This function used to be visible on the Lisp level, but there is no | |
| 149 real point in doing that. Here is the doc string: | |
| 150 | |
| 442 | 151 "Connect to an existing file descriptor. |
| 152 Return a subprocess-object to represent the connection. | |
| 153 Input and output work as for subprocesses; `delete-process' closes it. | |
| 154 Args are NAME BUFFER INFD OUTFD. | |
| 155 NAME is name for process. It is modified if necessary to make it unique. | |
| 156 BUFFER is the buffer (or buffer-name) to associate with the process. | |
| 157 Process output goes at end of that buffer, unless you specify | |
| 158 an output stream or filter function to handle the output. | |
| 159 BUFFER may also be nil, meaning that this process is not associated | |
| 160 with any buffer. | |
| 161 INFD and OUTFD specify the file descriptors to use for input and | |
| 428 | 162 output, respectively." |
| 163 */ | |
| 164 | |
| 165 Lisp_Object | |
| 166 connect_to_file_descriptor (Lisp_Object name, Lisp_Object buffer, | |
| 167 Lisp_Object infd, Lisp_Object outfd) | |
| 168 { | |
| 169 /* This function can GC */ | |
| 170 Lisp_Object proc; | |
| 4123 | 171 EMACS_INT inch; |
| 428 | 172 |
| 173 CHECK_STRING (name); | |
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174 CHECK_FIXNUM (infd); |
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175 CHECK_FIXNUM (outfd); |
| 428 | 176 |
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177 inch = XFIXNUM (infd); |
| 442 | 178 if (get_process_from_usid (FD_TO_USID (inch))) |
| 179 invalid_operation ("There is already a process connected to fd", infd); | |
| 428 | 180 if (!NILP (buffer)) |
| 181 buffer = Fget_buffer_create (buffer); | |
| 182 proc = make_process_internal (name); | |
| 183 | |
| 184 XPROCESS (proc)->pid = Fcons (infd, name); | |
| 185 XPROCESS (proc)->buffer = buffer; | |
| 853 | 186 init_process_io_handles (XPROCESS (proc), (void *) inch, |
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187 (void *) XFIXNUM (outfd), (void *) -1, 0); |
| 428 | 188 UNIX_DATA (XPROCESS (proc))->connected_via_filedesc_p = 1; |
| 189 | |
| 853 | 190 event_stream_select_process (XPROCESS (proc), 1, 1); |
| 428 | 191 |
| 192 return proc; | |
| 193 } | |
| 194 | |
| 442 | 195 static int allocate_pty_the_old_fashioned_way (void); |
| 196 | |
| 197 /* The file name of the (slave) pty opened by allocate_pty(). */ | |
| 198 #ifndef MAX_PTYNAME_LEN | |
| 199 #define MAX_PTYNAME_LEN 64 | |
| 200 #endif | |
| 867 | 201 static Ibyte pty_name[MAX_PTYNAME_LEN]; |
| 428 | 202 |
| 203 /* Open an available pty, returning a file descriptor. | |
| 204 Return -1 on failure. | |
| 205 The file name of the terminal corresponding to the pty | |
| 442 | 206 is left in the variable `pty_name'. */ |
| 428 | 207 |
| 208 static int | |
| 209 allocate_pty (void) | |
| 210 { | |
| 442 | 211 /* Unix98 standardized grantpt, unlockpt, and ptsname, but not the |
| 212 functions required to open a master pty in the first place :-( | |
| 213 | |
| 214 Modern Unix systems all seems to have convenience methods to open | |
| 215 a master pty fd in one function call, but there is little | |
| 216 agreement on how to do it. | |
| 217 | |
| 218 allocate_pty() tries all the different known easy ways of opening | |
| 219 a pty. In case of failure, we resort to the old BSD-style pty | |
| 220 grovelling code in allocate_pty_the_old_fashioned_way(). */ | |
| 221 int master_fd = -1; | |
| 771 | 222 const Extbyte *slave_name = NULL; |
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223 const Ascbyte *clone = NULL; |
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224 static const Ascbyte * const clones[] = |
| 771 | 225 /* Different pty master clone devices */ |
| 442 | 226 { |
| 227 "/dev/ptmx", /* Various systems */ | |
| 228 "/dev/ptm/clone", /* HPUX */ | |
| 229 "/dev/ptc", /* AIX */ | |
| 230 "/dev/ptmx_bsd" /* Tru64 */ | |
| 231 }; | |
| 232 | |
| 233 #ifdef HAVE_GETPT /* glibc */ | |
| 234 master_fd = getpt (); | |
| 235 if (master_fd >= 0) | |
| 236 goto have_master; | |
| 237 #endif /* HAVE_GETPT */ | |
| 238 | |
| 239 | |
| 240 #if defined(HAVE_OPENPTY) /* BSD, Tru64, glibc */ | |
| 241 { | |
| 242 int slave_fd = -1; | |
| 243 int rc; | |
| 244 EMACS_BLOCK_SIGNAL (SIGCHLD); | |
| 245 rc = openpty (&master_fd, &slave_fd, NULL, NULL, NULL); | |
| 246 EMACS_UNBLOCK_SIGNAL (SIGCHLD); | |
| 247 if (rc == 0) | |
| 248 { | |
| 249 slave_name = ttyname (slave_fd); | |
| 771 | 250 retry_close (slave_fd); |
| 442 | 251 goto have_slave_name; |
| 252 } | |
| 253 else | |
| 254 { | |
| 255 if (master_fd >= 0) | |
| 771 | 256 retry_close (master_fd); |
| 442 | 257 if (slave_fd >= 0) |
| 771 | 258 retry_close (slave_fd); |
| 442 | 259 } |
| 260 } | |
| 261 #endif /* HAVE_OPENPTY */ | |
| 262 | |
| 263 #if defined(HAVE__GETPTY) && defined (O_NDELAY) /* SGI */ | |
| 264 master_fd = -1; | |
| 265 EMACS_BLOCK_SIGNAL (SIGCHLD); | |
| 266 slave_name = _getpty (&master_fd, O_RDWR | O_NDELAY, 0600, 0); | |
| 267 EMACS_UNBLOCK_SIGNAL (SIGCHLD); | |
| 268 if (master_fd >= 0 && slave_name != NULL) | |
| 269 goto have_slave_name; | |
| 270 #endif /* HAVE__GETPTY */ | |
| 271 | |
| 272 /* Master clone devices are available on most systems */ | |
| 273 { | |
| 274 int i; | |
| 275 for (i = 0; i < countof (clones); i++) | |
| 276 { | |
| 277 clone = clones[i]; | |
| 867 | 278 master_fd = qxe_open ((Ibyte *) clone, |
| 771 | 279 O_RDWR | O_NONBLOCK | OPEN_BINARY, 0); |
| 442 | 280 if (master_fd >= 0) |
| 281 goto have_master; | |
| 282 } | |
| 283 clone = NULL; | |
| 284 } | |
| 285 | |
| 286 goto lose; | |
| 287 | |
| 288 have_master: | |
| 289 | |
| 290 #if defined (HAVE_PTSNAME) | |
| 291 slave_name = ptsname (master_fd); | |
| 292 if (slave_name) | |
| 293 goto have_slave_name; | |
| 294 #endif | |
| 295 | |
| 296 /* AIX docs say to use ttyname, not ptsname, to get slave_name */ | |
| 297 if (clone | |
| 298 && !strcmp (clone, "/dev/ptc") | |
| 299 && (slave_name = ttyname (master_fd)) != NULL) | |
| 300 goto have_slave_name; | |
| 301 | |
| 302 goto lose; | |
| 303 | |
| 304 have_slave_name: | |
| 771 | 305 { |
| 867 | 306 Ibyte *slaveint; |
| 771 | 307 |
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308 slaveint = EXTERNAL_TO_ITEXT (slave_name, Qfile_name); |
| 771 | 309 qxestrncpy (pty_name, slaveint, sizeof (pty_name)); |
| 310 } | |
| 311 | |
| 442 | 312 pty_name[sizeof (pty_name) - 1] = '\0'; |
| 313 setup_pty (master_fd); | |
| 314 | |
| 315 /* We jump through some hoops to frob the pty. | |
| 316 It's not obvious that checking the return code here is useful. */ | |
| 317 | |
| 318 /* "The grantpt() function will fail if it is unable to successfully | |
| 319 invoke the setuid root program. It may also fail if the | |
| 320 application has installed a signal handler to catch SIGCHLD | |
| 321 signals." */ | |
| 322 #if defined (HAVE_GRANTPT) || defined (HAVE_UNLOCKPT) | |
| 323 EMACS_BLOCK_SIGNAL (SIGCHLD); | |
| 324 | |
| 325 #if defined (HAVE_GRANTPT) | |
| 326 grantpt (master_fd); | |
| 327 #ifdef HPUX | |
| 328 /* grantpt() behavior on some versions of HP-UX differs from what's | |
| 329 specified in the man page: the group of the slave PTY is set to | |
| 330 the user's primary group, and we fix that. */ | |
| 331 { | |
| 332 struct group *tty_group = getgrnam ("tty"); | |
| 333 if (tty_group != NULL) | |
| 771 | 334 { |
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335 Extbyte *ptyout = ITEXT_TO_EXTERNAL (pty_name, Qfile_name); |
| 771 | 336 chown (ptyout, (uid_t) -1, tty_group->gr_gid); |
| 337 } | |
| 442 | 338 } |
| 339 #endif /* HPUX has broken grantpt() */ | |
| 340 #endif /* HAVE_GRANTPT */ | |
| 341 | |
| 342 #if defined (HAVE_UNLOCKPT) | |
| 343 unlockpt (master_fd); | |
| 344 #endif | |
| 345 | |
| 346 EMACS_UNBLOCK_SIGNAL (SIGCHLD); | |
| 347 #endif /* HAVE_GRANTPT || HAVE_UNLOCKPT */ | |
| 348 | |
| 349 return master_fd; | |
| 350 | |
| 351 lose: | |
| 352 if (master_fd >= 0) | |
| 771 | 353 retry_close (master_fd); |
| 442 | 354 return allocate_pty_the_old_fashioned_way (); |
| 355 } | |
| 356 | |
| 357 /* This function tries to allocate a pty by iterating through file | |
| 358 pairs with names like /dev/ptyp1 and /dev/ttyp1. */ | |
| 359 static int | |
| 360 allocate_pty_the_old_fashioned_way (void) | |
| 361 { | |
| 428 | 362 struct stat stb; |
| 363 | |
| 364 /* Some systems name their pseudoterminals so that there are gaps in | |
| 365 the usual sequence - for example, on HP9000/S700 systems, there | |
| 366 are no pseudoterminals with names ending in 'f'. So we wait for | |
| 367 three failures in a row before deciding that we've reached the | |
| 368 end of the ptys. */ | |
| 369 int failed_count = 0; | |
| 370 int fd; | |
| 371 int i; | |
| 372 int c; | |
| 373 | |
| 374 #ifdef PTY_ITERATION | |
| 375 PTY_ITERATION | |
| 376 #else | |
| 442 | 377 # ifndef FIRST_PTY_LETTER |
| 378 # define FIRST_PTY_LETTER 'p' | |
| 379 # endif | |
| 428 | 380 for (c = FIRST_PTY_LETTER; c <= 'z'; c++) |
| 381 for (i = 0; i < 16; i++) | |
| 442 | 382 #endif /* PTY_ITERATION */ |
| 383 | |
| 428 | 384 { |
| 385 #ifdef PTY_NAME_SPRINTF | |
| 386 PTY_NAME_SPRINTF | |
| 387 #else | |
| 771 | 388 qxesprintf (pty_name, "/dev/pty%c%x", c, i); |
| 428 | 389 #endif /* no PTY_NAME_SPRINTF */ |
| 390 | |
| 771 | 391 if (qxe_stat (pty_name, &stb) < 0) |
| 428 | 392 { |
| 442 | 393 if (++failed_count >= 3) |
| 428 | 394 return -1; |
| 395 } | |
| 396 else | |
| 397 failed_count = 0; | |
| 771 | 398 fd = qxe_open (pty_name, O_RDWR | O_NONBLOCK | OPEN_BINARY, 0); |
| 428 | 399 |
| 400 if (fd >= 0) | |
| 401 { | |
| 402 #ifdef PTY_TTY_NAME_SPRINTF | |
| 403 PTY_TTY_NAME_SPRINTF | |
| 404 #else | |
| 771 | 405 qxesprintf (pty_name, "/dev/tty%c%x", c, i); |
| 428 | 406 #endif /* no PTY_TTY_NAME_SPRINTF */ |
| 771 | 407 if (qxe_access (pty_name, R_OK | W_OK) == 0) |
| 428 | 408 { |
| 442 | 409 setup_pty (fd); |
| 410 return fd; | |
| 428 | 411 } |
| 771 | 412 retry_close (fd); |
| 428 | 413 } |
| 442 | 414 } /* iteration */ |
| 428 | 415 return -1; |
| 416 } | |
| 417 | |
| 418 static int | |
| 4123 | 419 create_bidirectional_pipe (EMACS_INT *inchannel, EMACS_INT *outchannel, |
| 420 volatile EMACS_INT *forkin, volatile EMACS_INT *forkout) | |
| 428 | 421 { |
| 422 int sv[2]; | |
| 423 | |
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424 if (pipe (sv) < 0) return -1; |
| 428 | 425 *inchannel = sv[0]; |
| 426 *forkout = sv[1]; | |
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427 if (pipe (sv) < 0) return -1; |
| 428 | 428 *outchannel = sv[1]; |
| 429 *forkin = sv[0]; | |
| 430 return 0; | |
| 431 } | |
| 432 | |
| 433 | |
| 434 #ifdef HAVE_SOCKETS | |
| 435 | |
| 502 | 436 #ifndef USE_GETADDRINFO |
| 428 | 437 static int |
| 438 get_internet_address (Lisp_Object host, struct sockaddr_in *address, | |
| 578 | 439 Error_Behavior errb) |
| 428 | 440 { |
| 441 struct hostent *host_info_ptr = NULL; | |
| 442 #ifdef TRY_AGAIN | |
| 443 int count = 0; | |
| 444 #endif | |
| 445 | |
| 446 xzero (*address); | |
| 447 | |
| 448 while (1) | |
| 449 { | |
| 771 | 450 Extbyte *hostext; |
| 451 | |
| 428 | 452 #ifdef TRY_AGAIN |
| 453 if (count++ > 10) break; | |
| 454 h_errno = 0; | |
| 455 #endif | |
| 771 | 456 |
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457 hostext = LISP_STRING_TO_EXTERNAL (host, Qunix_host_name_encoding); |
| 771 | 458 |
| 428 | 459 /* Some systems can't handle SIGIO/SIGALARM in gethostbyname. */ |
| 460 slow_down_interrupts (); | |
| 771 | 461 host_info_ptr = gethostbyname (hostext); |
| 428 | 462 speed_up_interrupts (); |
| 463 #ifdef TRY_AGAIN | |
| 464 if (! (host_info_ptr == 0 && h_errno == TRY_AGAIN)) | |
| 465 #endif | |
| 466 break; | |
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467 Fsleep_for (make_fixnum (1)); |
| 428 | 468 } |
| 469 if (host_info_ptr) | |
| 470 { | |
| 471 address->sin_family = host_info_ptr->h_addrtype; | |
| 502 | 472 memcpy (&address->sin_addr, host_info_ptr->h_addr, |
| 473 host_info_ptr->h_length); | |
| 428 | 474 } |
| 475 else | |
| 476 { | |
| 477 IN_ADDR numeric_addr; | |
| 1204 | 478 Extbyte *hostext; |
| 479 | |
| 428 | 480 /* Attempt to interpret host as numeric inet address */ |
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481 hostext = LISP_STRING_TO_EXTERNAL (host, Qunix_host_name_encoding); |
| 1204 | 482 numeric_addr = inet_addr (hostext); |
| 428 | 483 if (NUMERIC_ADDR_ERROR) |
| 484 { | |
| 563 | 485 maybe_signal_error (Qio_error, "Unknown host", host, |
| 1204 | 486 Qprocess, errb); |
| 428 | 487 return 0; |
| 488 } | |
| 489 | |
| 490 /* There was some broken code here that called strlen() here | |
| 491 on (char *) &numeric_addr and even sometimes accessed | |
| 492 uninitialized data. */ | |
| 493 address->sin_family = AF_INET; | |
| 494 * (IN_ADDR *) &address->sin_addr = numeric_addr; | |
| 495 } | |
| 496 | |
| 497 return 1; | |
| 498 } | |
| 502 | 499 #endif /* !USE_GETADDRINFO */ |
| 428 | 500 |
| 501 static void | |
| 2286 | 502 set_socket_nonblocking_maybe (int fd, |
| 503 #ifdef PROCESS_IO_BLOCKING | |
| 504 int port, const char *proto | |
| 505 #else | |
| 506 int UNUSED (port), const char *UNUSED (proto) | |
| 507 #endif | |
| 508 ) | |
| 428 | 509 { |
| 510 #ifdef PROCESS_IO_BLOCKING | |
| 511 Lisp_Object tail; | |
| 512 | |
| 513 for (tail = network_stream_blocking_port_list; CONSP (tail); tail = XCDR (tail)) | |
| 514 { | |
| 515 Lisp_Object tail_port = XCAR (tail); | |
| 516 | |
| 517 if (STRINGP (tail_port)) | |
| 518 { | |
| 519 struct servent *svc_info; | |
| 771 | 520 Extbyte *tailportext; |
| 521 | |
| 428 | 522 CHECK_STRING (tail_port); |
|
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parents:
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diff
changeset
|
523 svc_info = getservbyname (LISP_STRING_TO_EXTERNAL |
|
4aebb0131297
Cleanups/renaming of EXTERNAL_TO_C_STRING and friends
Ben Wing <ben@xemacs.org>
parents:
4953
diff
changeset
|
524 (tail_port, Qunix_service_name_encoding), |
|
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Cleanups/renaming of EXTERNAL_TO_C_STRING and friends
Ben Wing <ben@xemacs.org>
parents:
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diff
changeset
|
525 proto); |
| 428 | 526 if ((svc_info != 0) && (svc_info->s_port == port)) |
| 527 break; | |
| 528 else | |
| 529 continue; | |
| 530 } | |
|
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Mechanically change INT to FIXNUM in our sources.
Aidan Kehoe <kehoea@parhasard.net>
parents:
5438
diff
changeset
|
531 else if (FIXNUMP (tail_port) && (htons ((unsigned short) XFIXNUM (tail_port)) == port)) |
| 428 | 532 break; |
| 533 } | |
| 534 | |
| 535 if (!CONSP (tail)) | |
| 536 { | |
| 537 set_descriptor_non_blocking (fd); | |
| 538 } | |
| 539 #else | |
| 540 set_descriptor_non_blocking (fd); | |
| 541 #endif /* PROCESS_IO_BLOCKING */ | |
| 542 } | |
| 543 | |
| 544 #endif /* HAVE_SOCKETS */ | |
| 545 | |
| 546 /* Compute the Lisp form of the process status from | |
| 547 the numeric status that was returned by `wait'. */ | |
| 548 | |
| 549 static void | |
| 440 | 550 update_status_from_wait_code (Lisp_Process *p, int *w_fmh) |
| 428 | 551 { |
| 552 /* C compiler lossage when attempting to pass w directly */ | |
| 553 int w = *w_fmh; | |
| 554 | |
| 555 if (WIFSTOPPED (w)) | |
| 556 { | |
| 557 p->status_symbol = Qstop; | |
| 558 p->exit_code = WSTOPSIG (w); | |
| 559 p->core_dumped = 0; | |
| 560 } | |
| 561 else if (WIFEXITED (w)) | |
| 562 { | |
| 563 p->status_symbol = Qexit; | |
| 564 p->exit_code = WEXITSTATUS (w); | |
| 565 p->core_dumped = 0; | |
| 566 } | |
| 567 else if (WIFSIGNALED (w)) | |
| 568 { | |
| 569 p->status_symbol = Qsignal; | |
| 570 p->exit_code = WTERMSIG (w); | |
| 571 p->core_dumped = WCOREDUMP (w); | |
| 572 } | |
| 573 else | |
| 574 { | |
| 575 p->status_symbol = Qrun; | |
| 576 p->exit_code = 0; | |
| 577 } | |
| 578 } | |
| 579 | |
| 580 #ifdef SIGCHLD | |
| 581 | |
| 582 #define MAX_EXITED_PROCESSES 1000 | |
| 583 static volatile pid_t exited_processes[MAX_EXITED_PROCESSES]; | |
| 584 static volatile int exited_processes_status[MAX_EXITED_PROCESSES]; | |
| 585 static volatile int exited_processes_index; | |
| 586 | |
| 587 static volatile int sigchld_happened; | |
| 588 | |
| 589 /* On receipt of a signal that a child status has changed, | |
| 590 loop asking about children with changed statuses until | |
| 591 the system says there are no more. All we do is record | |
| 592 the processes and wait status. | |
| 593 | |
| 594 This function could be called from within the SIGCHLD | |
| 595 handler, so it must be completely reentrant. When | |
| 596 not called from a SIGCHLD handler, BLOCK_SIGCHLD should | |
| 597 be non-zero so that SIGCHLD is blocked while this | |
| 598 function is running. (This is necessary so avoid | |
| 599 race conditions with the SIGCHLD_HAPPENED flag). */ | |
| 600 | |
| 601 static void | |
| 602 record_exited_processes (int block_sigchld) | |
| 603 { | |
| 604 if (!sigchld_happened) | |
| 605 { | |
| 606 return; | |
| 607 } | |
| 608 | |
| 609 #ifdef EMACS_BLOCK_SIGNAL | |
| 610 if (block_sigchld) | |
| 611 EMACS_BLOCK_SIGNAL (SIGCHLD); | |
| 612 #endif | |
| 613 | |
| 614 while (sigchld_happened) | |
| 615 { | |
| 616 int pid; | |
| 617 int w; | |
| 618 | |
| 619 /* Keep trying to get a status until we get a definitive result. */ | |
| 620 do | |
| 621 { | |
| 622 errno = 0; | |
| 623 #ifdef WNOHANG | |
| 624 # ifndef WUNTRACED | |
| 625 # define WUNTRACED 0 | |
| 626 # endif /* not WUNTRACED */ | |
| 627 # ifdef HAVE_WAITPID | |
| 628 pid = waitpid ((pid_t) -1, &w, WNOHANG | WUNTRACED); | |
| 629 # else | |
| 630 pid = wait3 (&w, WNOHANG | WUNTRACED, 0); | |
| 631 # endif | |
| 632 #else /* not WNOHANG */ | |
| 633 pid = wait (&w); | |
| 634 #endif /* not WNOHANG */ | |
| 635 } | |
| 636 while (pid <= 0 && errno == EINTR); | |
| 637 | |
| 638 if (pid <= 0) | |
| 639 break; | |
| 640 | |
| 641 if (exited_processes_index < MAX_EXITED_PROCESSES) | |
| 642 { | |
| 643 exited_processes[exited_processes_index] = pid; | |
| 644 exited_processes_status[exited_processes_index] = w; | |
| 645 exited_processes_index++; | |
| 646 } | |
| 647 | |
| 648 /* On systems with WNOHANG, we just ignore the number | |
| 649 of times that SIGCHLD was signalled, and keep looping | |
| 650 until there are no more processes to wait on. If we | |
| 651 don't have WNOHANG, we have to rely on the count in | |
| 652 SIGCHLD_HAPPENED. */ | |
| 653 #ifndef WNOHANG | |
| 654 sigchld_happened--; | |
| 655 #endif /* not WNOHANG */ | |
| 656 } | |
| 657 | |
| 658 sigchld_happened = 0; | |
| 659 | |
| 660 if (block_sigchld) | |
| 661 EMACS_UNBLOCK_SIGNAL (SIGCHLD); | |
| 662 } | |
| 663 | |
| 664 /* For any processes that have changed status and are recorded | |
| 440 | 665 and such, update the corresponding Lisp_Process. |
| 428 | 666 We separate this from record_exited_processes() so that |
| 667 we never have to call this function from within a signal | |
| 668 handler. We block SIGCHLD in case record_exited_processes() | |
| 669 is called from a signal handler. */ | |
| 670 | |
| 671 /** USG WARNING: Although it is not obvious from the documentation | |
| 672 in signal(2), on a USG system the SIGCLD handler MUST NOT call | |
| 673 signal() before executing at least one wait(), otherwise the handler | |
| 674 will be called again, resulting in an infinite loop. The relevant | |
| 675 portion of the documentation reads "SIGCLD signals will be queued | |
| 676 and the signal-catching function will be continually reentered until | |
| 677 the queue is empty". Invoking signal() causes the kernel to reexamine | |
| 678 the SIGCLD queue. Fred Fish, UniSoft Systems Inc. | |
| 679 | |
| 680 (Note that now this only applies in SYS V Release 2 and before. | |
| 681 On SYS V Release 3, we use sigset() to set the signal handler for | |
| 682 the first time, and so we don't have to reestablish the signal handler | |
| 683 in the handler below. On SYS V Release 4, we don't get this weirdo | |
| 684 behavior when we use sigaction(), which we do use.) */ | |
| 685 | |
| 686 static SIGTYPE | |
| 2286 | 687 sigchld_handler (int SIG_ARG_MAYBE_UNUSED (signo)) |
| 428 | 688 { |
| 689 #ifdef OBNOXIOUS_SYSV_SIGCLD_BEHAVIOR | |
| 690 int old_errno = errno; | |
| 691 | |
| 692 sigchld_happened++; | |
| 693 record_exited_processes (0); | |
| 694 errno = old_errno; | |
| 695 #else | |
| 696 sigchld_happened++; | |
| 697 #endif | |
| 698 #ifdef HAVE_UNIXOID_EVENT_LOOP | |
| 699 signal_fake_event (); | |
| 700 #endif | |
| 701 /* WARNING - must come after wait3() for USG systems */ | |
| 702 EMACS_REESTABLISH_SIGNAL (signo, sigchld_handler); | |
| 703 SIGRETURN; | |
| 704 } | |
| 705 | |
| 706 #endif /* SIGCHLD */ | |
| 707 | |
| 708 #ifdef SIGNALS_VIA_CHARACTERS | |
| 709 /* Get signal character to send to process if SIGNALS_VIA_CHARACTERS */ | |
| 710 | |
| 711 static int | |
| 712 process_signal_char (int tty_fd, int signo) | |
| 713 { | |
| 714 /* If it's not a tty, pray that these default values work */ | |
| 853 | 715 if (! isatty (tty_fd)) |
| 716 { | |
| 428 | 717 #define CNTL(ch) (037 & (ch)) |
| 853 | 718 switch (signo) |
| 719 { | |
| 720 case SIGINT: return CNTL ('C'); | |
| 721 case SIGQUIT: return CNTL ('\\'); | |
| 428 | 722 #ifdef SIGTSTP |
| 853 | 723 case SIGTSTP: return CNTL ('Z'); |
| 428 | 724 #endif |
| 853 | 725 } |
| 726 } | |
| 428 | 727 |
| 728 #ifdef HAVE_TERMIOS | |
| 729 /* TERMIOS is the latest and bestest, and seems most likely to work. | |
| 730 If the system has it, use it. */ | |
| 731 { | |
| 732 struct termios t; | |
| 733 tcgetattr (tty_fd, &t); | |
| 734 switch (signo) | |
| 735 { | |
| 736 case SIGINT: return t.c_cc[VINTR]; | |
| 737 case SIGQUIT: return t.c_cc[VQUIT]; | |
| 738 #if defined(SIGTSTP) && defined(VSUSP) | |
| 739 case SIGTSTP: return t.c_cc[VSUSP]; | |
| 740 #endif | |
| 741 } | |
| 742 } | |
| 743 | |
| 744 # elif defined (TIOCGLTC) && defined (TIOCGETC) /* not HAVE_TERMIOS */ | |
| 745 { | |
| 746 /* On Berkeley descendants, the following IOCTL's retrieve the | |
| 747 current control characters. */ | |
| 748 struct tchars c; | |
| 749 struct ltchars lc; | |
| 750 switch (signo) | |
| 751 { | |
| 752 case SIGINT: ioctl (tty_fd, TIOCGETC, &c); return c.t_intrc; | |
| 753 case SIGQUIT: ioctl (tty_fd, TIOCGETC, &c); return c.t_quitc; | |
| 754 # ifdef SIGTSTP | |
| 755 case SIGTSTP: ioctl (tty_fd, TIOCGLTC, &lc); return lc.t_suspc; | |
| 756 # endif /* SIGTSTP */ | |
| 757 } | |
| 758 } | |
| 759 | |
| 760 # elif defined (TCGETA) /* ! defined (TIOCGLTC) && defined (TIOCGETC) */ | |
| 761 { | |
| 762 /* On SYSV descendants, the TCGETA ioctl retrieves the current | |
| 763 control characters. */ | |
| 764 struct termio t; | |
| 765 ioctl (tty_fd, TCGETA, &t); | |
| 766 switch (signo) { | |
| 767 case SIGINT: return t.c_cc[VINTR]; | |
| 768 case SIGQUIT: return t.c_cc[VQUIT]; | |
| 769 # ifdef SIGTSTP | |
| 770 case SIGTSTP: return t.c_cc[VSWTCH]; | |
| 771 # endif /* SIGTSTP */ | |
| 772 } | |
| 773 } | |
| 774 # else /* ! defined (TCGETA) */ | |
| 775 #error ERROR! Using SIGNALS_VIA_CHARACTERS, but not HAVE_TERMIOS || (TIOCGLTC && TIOCGETC) || TCGETA | |
| 776 /* If your system configuration files define SIGNALS_VIA_CHARACTERS, | |
| 777 you'd better be using one of the alternatives above! */ | |
| 778 # endif /* ! defined (TCGETA) */ | |
| 779 return '\0'; | |
| 780 } | |
| 781 #endif /* SIGNALS_VIA_CHARACTERS */ | |
| 782 | |
| 783 | |
| 784 | |
| 785 | |
| 786 /**********************************************************************/ | |
| 787 /* Process implementation methods */ | |
| 788 /**********************************************************************/ | |
| 789 | |
| 790 /* | |
| 791 * Allocate and initialize Lisp_Process->process_data | |
| 792 */ | |
| 793 | |
| 794 static void | |
| 440 | 795 unix_alloc_process_data (Lisp_Process *p) |
| 428 | 796 { |
| 797 p->process_data = xnew (struct unix_process_data); | |
| 798 | |
| 1204 | 799 UNIX_DATA (p)->connected_via_filedesc_p = 0; |
| 800 UNIX_DATA (p)->infd = -1; | |
| 801 UNIX_DATA (p)->errfd = -1; | |
| 802 UNIX_DATA (p)->subtty = -1; | |
| 803 UNIX_DATA (p)->pty_flag = 0; | |
| 428 | 804 } |
| 805 | |
| 806 /* | |
| 807 * Initialize XEmacs process implementation once | |
| 808 */ | |
| 809 | |
| 810 #ifdef SIGCHLD | |
| 811 static void | |
| 812 unix_init_process (void) | |
| 813 { | |
| 814 if (! noninteractive || initialized) | |
| 613 | 815 EMACS_SIGNAL (SIGCHLD, sigchld_handler); |
| 428 | 816 } |
| 817 #endif /* SIGCHLD */ | |
| 818 | |
| 819 /* | |
| 820 * Initialize any process local data. This is called when newly | |
| 821 * created process is connected to real OS file handles. The | |
| 822 * handles are generally represented by void* type, but are | |
| 442 | 823 * of type int (file descriptors) for UNIX. |
| 428 | 824 */ |
| 825 | |
| 826 static void | |
| 2286 | 827 unix_init_process_io_handles (Lisp_Process *p, void *in, void *UNUSED (out), |
| 828 void *err, int UNUSED (flags)) | |
| 853 | 829 { |
| 4031 | 830 /* if sizeof(EMACS_INT) > sizeof(int) this truncates the value */ |
| 831 UNIX_DATA(p)->infd = (EMACS_INT) in; | |
| 832 UNIX_DATA(p)->errfd = (EMACS_INT) err; | |
| 853 | 833 } |
| 834 | |
| 835 /* Move the file descriptor FD so that its number is not less than MIN. * | |
| 836 The original file descriptor remains open. */ | |
| 837 static int | |
| 838 relocate_fd (int fd, int min) | |
| 839 { | |
| 840 if (fd >= min) | |
| 841 return fd; | |
| 842 else | |
| 843 { | |
| 844 int newfd = dup (fd); | |
| 845 if (newfd == -1) | |
| 846 { | |
| 867 | 847 Ibyte *errmess; |
| 853 | 848 GET_STRERROR (errmess, errno); |
| 849 stderr_out ("Error while setting up child: %s\n", errmess); | |
| 850 _exit (1); | |
| 851 } | |
| 852 return relocate_fd (newfd, min); | |
| 853 } | |
| 854 } | |
| 855 | |
| 856 /* This is the last thing run in a newly forked inferior process. | |
| 857 Copy descriptors IN, OUT and ERR | |
| 858 as descriptors STDIN_FILENO, STDOUT_FILENO, and STDERR_FILENO. | |
| 859 Initialize inferior's priority, pgrp, connected dir and environment. | |
| 860 then exec another program based on new_argv. | |
| 861 | |
| 862 XEmacs: We've removed the SET_PGRP argument because it's already | |
| 863 done by the callers of child_setup. | |
| 864 | |
| 865 CURRENT_DIR is an elisp string giving the path of the current | |
| 866 directory the subprocess should have. Since we can't really signal | |
| 867 a decent error from within the child (#### not quite correct in | |
| 868 XEmacs?), this should be verified as an executable directory by the | |
| 869 parent. */ | |
| 870 | |
| 2268 | 871 static DECLARE_DOESNT_RETURN (child_setup (int, int, int, Ibyte **, |
| 872 Lisp_Object)); | |
| 873 | |
| 874 static DOESNT_RETURN | |
| 867 | 875 child_setup (int in, int out, int err, Ibyte **new_argv, |
| 853 | 876 Lisp_Object current_dir) |
| 428 | 877 { |
| 867 | 878 Ibyte **env; |
| 879 Ibyte *pwd; | |
| 853 | 880 |
| 881 #ifdef SET_EMACS_PRIORITY | |
| 882 if (emacs_priority != 0) | |
| 883 nice (- emacs_priority); | |
| 884 #endif | |
| 885 | |
| 886 /* Close Emacs's descriptors that this process should not have. */ | |
| 887 close_process_descs (); | |
| 888 close_load_descs (); | |
| 889 | |
| 890 /* [[Note that use of alloca is always safe here. It's obvious for systems | |
| 891 that do not have true vfork or that have true (stack) alloca. | |
| 892 If using vfork and C_ALLOCA it is safe because that changes | |
| 893 the superior's static variables as if the superior had done alloca | |
| 894 and will be cleaned up in the usual way.]] -- irrelevant because | |
| 895 XEmacs does not use vfork. */ | |
| 896 { | |
| 897 REGISTER Bytecount i; | |
| 898 | |
| 899 i = XSTRING_LENGTH (current_dir); | |
| 2367 | 900 pwd = alloca_ibytes (i + 6); |
| 853 | 901 memcpy (pwd, "PWD=", 4); |
| 902 memcpy (pwd + 4, XSTRING_DATA (current_dir), i); | |
| 903 i += 4; | |
| 904 if (!IS_DIRECTORY_SEP (pwd[i - 1])) | |
| 905 pwd[i++] = DIRECTORY_SEP; | |
| 906 pwd[i] = 0; | |
| 907 | |
| 908 /* [[We can't signal an Elisp error here; we're in a vfork. Since | |
| 909 the callers check the current directory before forking, this | |
| 910 should only return an error if the directory's permissions | |
| 911 are changed between the check and this chdir, but we should | |
| 912 at least check.]] -- irrelevant because XEmacs does not use vfork. */ | |
| 913 if (qxe_chdir (pwd + 4) < 0) | |
| 914 { | |
| 915 /* Don't report the chdir error, or ange-ftp.el doesn't work. */ | |
| 916 /* (FSFmacs does _exit (errno) here.) */ | |
| 917 pwd = 0; | |
| 918 } | |
| 919 else | |
| 920 { | |
| 921 /* Strip trailing "/". Cretinous *[]&@$#^%@#$% Un*x */ | |
| 922 /* leave "//" (from FSF) */ | |
| 923 while (i > 6 && IS_DIRECTORY_SEP (pwd[i - 1])) | |
| 924 pwd[--i] = 0; | |
| 925 } | |
| 926 } | |
| 927 | |
| 928 /* Set `env' to a vector of the strings in Vprocess_environment. */ | |
| 929 /* + 2 to include PWD and terminating 0. */ | |
|
5581
56144c8593a8
Mechanically change INT to FIXNUM in our sources.
Aidan Kehoe <kehoea@parhasard.net>
parents:
5438
diff
changeset
|
930 env = alloca_array (Ibyte *, XFIXNUM (Flength (Vprocess_environment)) + 2); |
| 853 | 931 { |
| 932 REGISTER Lisp_Object tail; | |
| 867 | 933 Ibyte **new_env = env; |
| 853 | 934 |
| 935 /* If we have a PWD envvar and we know the real current directory, | |
| 936 pass one down, but with corrected value. */ | |
| 937 if (pwd && egetenv ("PWD")) | |
| 938 *new_env++ = pwd; | |
| 939 | |
| 940 /* Copy the Vprocess_environment strings into new_env. */ | |
| 941 for (tail = Vprocess_environment; | |
| 942 CONSP (tail) && STRINGP (XCAR (tail)); | |
| 943 tail = XCDR (tail)) | |
| 944 { | |
| 867 | 945 Ibyte **ep = env; |
| 946 Ibyte *envvar = XSTRING_DATA (XCAR (tail)); | |
| 853 | 947 |
| 948 /* See if envvar duplicates any string already in the env. | |
| 949 If so, don't put it in. | |
| 950 When an env var has multiple definitions, | |
| 951 we keep the definition that comes first in process-environment. */ | |
| 952 for (; ep != new_env; ep++) | |
| 953 { | |
| 867 | 954 Ibyte *p = *ep, *q = envvar; |
| 853 | 955 while (1) |
| 956 { | |
| 957 if (*q == 0) | |
| 958 /* The string is malformed; might as well drop it. */ | |
| 959 goto duplicate; | |
| 960 if (*q != *p) | |
| 961 break; | |
| 962 if (*q == '=') | |
| 963 goto duplicate; | |
| 964 p++, q++; | |
| 965 } | |
| 966 } | |
| 867 | 967 if (pwd && !qxestrncmp ((Ibyte *) "PWD=", envvar, 4)) |
| 853 | 968 { |
| 969 *new_env++ = pwd; | |
| 970 pwd = 0; | |
| 971 } | |
| 972 else | |
| 973 *new_env++ = envvar; | |
| 974 | |
| 975 duplicate: ; | |
| 976 } | |
| 977 | |
| 978 *new_env = 0; | |
| 979 } | |
| 980 | |
| 981 /* Make sure that in, out, and err are not actually already in | |
| 982 descriptors zero, one, or two; this could happen if Emacs is | |
| 983 started with its standard in, out, or error closed, as might | |
| 984 happen under X. */ | |
| 985 in = relocate_fd (in, 3); | |
| 986 out = relocate_fd (out, 3); | |
| 987 err = relocate_fd (err, 3); | |
| 988 | |
| 989 /* Set the standard input/output channels of the new process. */ | |
| 990 retry_close (STDIN_FILENO); | |
| 991 retry_close (STDOUT_FILENO); | |
| 992 retry_close (STDERR_FILENO); | |
| 993 | |
| 994 dup2 (in, STDIN_FILENO); | |
| 995 dup2 (out, STDOUT_FILENO); | |
| 996 dup2 (err, STDERR_FILENO); | |
| 997 | |
| 998 retry_close (in); | |
| 999 retry_close (out); | |
| 1000 retry_close (err); | |
| 1001 | |
| 1015 | 1002 /* Close non-process-related file descriptors. It would be cleaner to |
| 932 | 1003 close just the ones that need to be, but the following brute |
| 1015 | 1004 force approach is certainly effective, and not too slow. */ |
| 932 | 1005 |
| 1006 { | |
| 1007 int fd; | |
| 1015 | 1008 |
| 1009 for (fd = 3; fd < MAXDESC; fd++) | |
| 932 | 1010 retry_close (fd); |
| 1011 } | |
| 1012 | |
| 853 | 1013 /* we've wrapped execve; it translates its arguments */ |
| 1014 qxe_execve (new_argv[0], new_argv, env); | |
| 1015 | |
| 1016 stdout_out ("Can't exec program %s\n", new_argv[0]); | |
| 1017 _exit (1); | |
| 428 | 1018 } |
| 1019 | |
| 1020 /* | |
| 1021 * Fork off a subprocess. P is a pointer to a newly created subprocess | |
| 1022 * object. If this function signals, the caller is responsible for | |
| 1023 * deleting (and finalizing) the process object. | |
| 1024 * | |
| 1025 * The method must return PID of the new process, a (positive??? ####) number | |
| 1026 * which fits into Lisp_Int. No return value indicates an error, the method | |
| 1027 * must signal an error instead. | |
| 1028 */ | |
| 1029 | |
| 1030 static int | |
| 440 | 1031 unix_create_process (Lisp_Process *p, |
| 428 | 1032 Lisp_Object *argv, int nargv, |
| 853 | 1033 Lisp_Object program, Lisp_Object cur_dir, |
| 1034 int separate_err) | |
| 428 | 1035 { |
| 1036 int pid; | |
| 4123 | 1037 EMACS_INT inchannel = -1; |
| 1038 EMACS_INT outchannel = -1; | |
| 1039 EMACS_INT errchannel = -1; | |
| 428 | 1040 /* Use volatile to protect variables from being clobbered by longjmp. */ |
| 4123 | 1041 volatile EMACS_INT forkin = -1; |
| 1042 volatile EMACS_INT forkout = -1; | |
| 1043 volatile EMACS_INT forkerr = -1; | |
| 428 | 1044 volatile int pty_flag = 0; |
| 1045 | |
| 1046 if (!NILP (Vprocess_connection_type)) | |
| 1047 { | |
| 1048 /* find a new pty, open the master side, return the opened | |
| 1049 file handle, and store the name of the corresponding slave | |
| 1050 side in global variable pty_name. */ | |
| 1051 outchannel = inchannel = allocate_pty (); | |
| 1052 } | |
| 1053 | |
| 535 | 1054 if (inchannel >= 0) /* We successfully allocated a pty. */ |
| 428 | 1055 { |
| 1056 /* You're "supposed" to now open the slave in the child. | |
| 1057 On some systems, we can open it here; this allows for | |
| 1058 better error checking. */ | |
| 1059 #if !defined(USG) | |
| 1060 /* On USG systems it does not work to open the pty's tty here | |
| 1061 and then close and reopen it in the child. */ | |
| 853 | 1062 # ifdef O_NOCTTY |
| 428 | 1063 /* Don't let this terminal become our controlling terminal |
| 1064 (in case we don't have one). */ | |
| 771 | 1065 forkout = forkin = qxe_open (pty_name, |
| 1066 O_RDWR | O_NOCTTY | OPEN_BINARY, 0); | |
| 853 | 1067 # else |
| 771 | 1068 forkout = forkin = qxe_open (pty_name, O_RDWR | OPEN_BINARY, 0); |
| 853 | 1069 # endif |
| 428 | 1070 if (forkin < 0) |
| 1071 goto io_failure; | |
| 1072 #endif /* not USG */ | |
| 853 | 1073 UNIX_DATA (p)->pty_flag = pty_flag = 1; |
| 428 | 1074 } |
| 1075 else | |
| 1076 if (create_bidirectional_pipe (&inchannel, &outchannel, | |
| 1077 &forkin, &forkout) < 0) | |
| 1078 goto io_failure; | |
| 1079 | |
| 853 | 1080 if (separate_err) |
| 1081 { | |
| 1082 int sv[2]; | |
| 854 | 1083 |
| 853 | 1084 if (pipe (sv) < 0) |
| 1085 goto io_failure; | |
| 1086 forkerr = sv[1]; | |
| 1087 errchannel = sv[0]; | |
| 1088 } | |
| 854 | 1089 |
| 428 | 1090 #if 0 |
| 1091 /* Replaced by close_process_descs */ | |
| 1092 set_exclusive_use (inchannel); | |
| 1093 set_exclusive_use (outchannel); | |
| 1094 #endif | |
| 1095 | |
| 1096 set_descriptor_non_blocking (inchannel); | |
| 1192 | 1097 set_descriptor_non_blocking (outchannel); |
| 853 | 1098 if (errchannel >= 0) |
| 1099 set_descriptor_non_blocking (errchannel); | |
| 428 | 1100 |
| 1101 /* Record this as an active process, with its channels. | |
| 1102 As a result, child_setup will close Emacs's side of the pipes. */ | |
| 853 | 1103 init_process_io_handles (p, (void *) inchannel, (void *) outchannel, |
| 1104 (void *) errchannel, | |
| 428 | 1105 pty_flag ? STREAM_PTY_FLUSHING : 0); |
| 1106 /* Record the tty descriptor used in the subprocess. */ | |
| 853 | 1107 UNIX_DATA (p)->subtty = forkin; |
| 428 | 1108 |
| 1109 { | |
| 1110 pid = fork (); | |
| 1111 if (pid == 0) | |
| 1112 { | |
| 1113 /**** Now we're in the child process ****/ | |
| 1114 int xforkin = forkin; | |
| 1115 int xforkout = forkout; | |
| 853 | 1116 int xforkerr = forkerr; |
| 428 | 1117 |
| 1015 | 1118 /* Checking for quit in the child is bad because that will |
| 1119 cause I/O, and that, in turn, can confuse the X connection. */ | |
| 1120 begin_dont_check_for_quit(); | |
| 1121 | |
| 442 | 1122 /* Disconnect the current controlling terminal, pursuant to |
| 1123 making the pty be the controlling terminal of the process. | |
| 1124 Also put us in our own process group. */ | |
| 1125 | |
| 1126 disconnect_controlling_terminal (); | |
| 1127 | |
| 1128 if (pty_flag) | |
| 428 | 1129 { |
| 1130 /* Open the pty connection and make the pty's terminal | |
| 1131 our controlling terminal. | |
| 1132 | |
| 1133 On systems with TIOCSCTTY, we just use it to set | |
| 1134 the controlling terminal. On other systems, the | |
| 1135 first TTY we open becomes the controlling terminal. | |
| 1136 So, we end up with four possibilities: | |
| 1137 | |
| 1138 (1) on USG and TIOCSCTTY systems, we open the pty | |
| 1139 and use TIOCSCTTY. | |
| 1140 (2) on other USG systems, we just open the pty. | |
| 1141 (3) on non-USG systems with TIOCSCTTY, we | |
| 1142 just use TIOCSCTTY. (On non-USG systems, we | |
| 1143 already opened the pty in the parent process.) | |
| 1144 (4) on non-USG systems without TIOCSCTTY, we | |
| 1145 close the pty and reopen it. | |
| 1146 | |
| 1147 This would be cleaner if we didn't open the pty | |
| 1148 in the parent process, but doing it that way | |
| 1149 makes it possible to trap error conditions. | |
| 1150 It's harder to convey an error from the child | |
| 1151 process, and I don't feel like messing with | |
| 1152 this now. */ | |
| 1153 | |
| 1154 /* SunOS has TIOCSCTTY but the close/open method | |
| 1155 also works. */ | |
| 1156 | |
| 853 | 1157 #if defined (USG) || !defined (TIOCSCTTY) |
| 428 | 1158 /* Now close the pty (if we had it open) and reopen it. |
| 1159 This makes the pty the controlling terminal of the | |
| 1160 subprocess. */ | |
| 853 | 1161 /* I wonder if retry_close (qxe_open (pty_name, ...)) would |
| 1162 work? */ | |
| 428 | 1163 if (xforkin >= 0) |
| 771 | 1164 retry_close (xforkin); |
| 1165 xforkout = xforkin = qxe_open (pty_name, O_RDWR | OPEN_BINARY, 0); | |
| 428 | 1166 if (xforkin < 0) |
| 1167 { | |
| 771 | 1168 retry_write (1, "Couldn't open the pty terminal ", 31); |
| 1169 retry_write (1, pty_name, qxestrlen (pty_name)); | |
| 1170 retry_write (1, "\n", 1); | |
| 428 | 1171 _exit (1); |
| 1172 } | |
| 853 | 1173 #endif /* USG or not TIOCSCTTY */ |
| 428 | 1174 |
| 1175 /* Miscellaneous setup required for some systems. | |
| 1176 Must be done before using tc* functions on xforkin. | |
| 1177 This guarantees that isatty(xforkin) is true. */ | |
| 1178 | |
| 853 | 1179 #if defined (HAVE_ISASTREAM) && defined (I_PUSH) |
| 442 | 1180 if (isastream (xforkin)) |
| 1181 { | |
| 853 | 1182 # if defined (I_FIND) |
| 1183 # define stream_module_pushed(fd, module) (ioctl (fd, I_FIND, module) == 1) | |
| 1184 # else | |
| 1185 # define stream_module_pushed(fd, module) 0 | |
| 1186 # endif | |
| 442 | 1187 if (! stream_module_pushed (xforkin, "ptem")) |
| 1188 ioctl (xforkin, I_PUSH, "ptem"); | |
| 1189 if (! stream_module_pushed (xforkin, "ldterm")) | |
| 1190 ioctl (xforkin, I_PUSH, "ldterm"); | |
| 1191 if (! stream_module_pushed (xforkin, "ttcompat")) | |
| 1192 ioctl (xforkin, I_PUSH, "ttcompat"); | |
| 1193 } | |
| 853 | 1194 #endif /* defined (HAVE_ISASTREAM) && defined (I_PUSH) */ |
| 428 | 1195 |
| 853 | 1196 #ifdef TIOCSCTTY |
| 428 | 1197 /* We ignore the return value |
| 1198 because faith@cs.unc.edu says that is necessary on Linux. */ | |
| 1199 assert (isatty (xforkin)); | |
| 1200 ioctl (xforkin, TIOCSCTTY, 0); | |
| 853 | 1201 #endif /* TIOCSCTTY */ |
| 428 | 1202 |
| 1203 /* Change the line discipline. */ | |
| 1204 | |
| 853 | 1205 #if defined (HAVE_TERMIOS) && defined (LDISC1) |
| 428 | 1206 { |
| 1207 struct termios t; | |
| 1208 assert (isatty (xforkin)); | |
| 1209 tcgetattr (xforkin, &t); | |
| 1210 t.c_lflag = LDISC1; | |
| 1211 if (tcsetattr (xforkin, TCSANOW, &t) < 0) | |
| 1212 perror ("create_process/tcsetattr LDISC1 failed\n"); | |
| 1213 } | |
| 853 | 1214 #elif defined (NTTYDISC) && defined (TIOCSETD) |
| 428 | 1215 { |
| 1216 /* Use new line discipline. TIOCSETD is accepted and | |
| 1217 ignored on Sys5.4 systems with ttcompat. */ | |
| 1218 int ldisc = NTTYDISC; | |
| 1219 assert (isatty (xforkin)); | |
| 1220 ioctl (xforkin, TIOCSETD, &ldisc); | |
| 1221 } | |
| 853 | 1222 #endif /* TIOCSETD & NTTYDISC */ |
| 428 | 1223 |
| 1224 /* Make our process group be the foreground group | |
| 1225 of our new controlling terminal. */ | |
| 1226 | |
| 1227 { | |
| 442 | 1228 pid_t piddly = EMACS_GET_PROCESS_GROUP (); |
| 428 | 1229 EMACS_SET_TTY_PROCESS_GROUP (xforkin, &piddly); |
| 1230 } | |
| 1231 | |
| 1232 /* On AIX, we've disabled SIGHUP above once we start a | |
| 1233 child on a pty. Now reenable it in the child, so it | |
| 1234 will die when we want it to. | |
| 1235 JV: This needs to be done ALWAYS as we might have inherited | |
| 1236 a SIG_IGN handling from our parent (nohup) and we are in new | |
| 1237 process group. | |
| 1238 */ | |
| 613 | 1239 EMACS_SIGNAL (SIGHUP, SIG_DFL); |
| 428 | 1240 |
| 535 | 1241 /* Set up the terminal characteristics of the pty. */ |
| 1242 child_setup_tty (xforkout); | |
| 1243 } /* if (pty_flag) */ | |
| 428 | 1244 |
| 1245 | |
| 613 | 1246 EMACS_SIGNAL (SIGINT, SIG_DFL); |
| 1247 EMACS_SIGNAL (SIGQUIT, SIG_DFL); | |
| 428 | 1248 |
| 1249 { | |
| 867 | 1250 Ibyte **new_argv = alloca_array (Ibyte *, nargv + 2); |
| 428 | 1251 int i; |
| 1252 | |
| 1253 /* Nothing below here GCs so our string pointers shouldn't move. */ | |
| 771 | 1254 new_argv[0] = XSTRING_DATA (program); |
| 428 | 1255 for (i = 0; i < nargv; i++) |
| 1256 { | |
| 1257 CHECK_STRING (argv[i]); | |
| 771 | 1258 new_argv[i + 1] = XSTRING_DATA (argv[i]); |
| 428 | 1259 } |
| 1260 new_argv[i + 1] = 0; | |
| 1261 | |
| 853 | 1262 child_setup (xforkin, xforkout, separate_err ? xforkerr : xforkout, |
| 1263 new_argv, cur_dir); | |
| 428 | 1264 } |
| 1265 | |
| 1266 } /**** End of child code ****/ | |
| 1267 | |
| 1268 /**** Back in parent process ****/ | |
| 1269 } | |
| 1270 | |
| 1271 if (pid < 0) | |
| 1272 { | |
| 853 | 1273 /* Note: The caller set up an unwind-protect to automatically delete |
| 1274 the process if we fail. This will correctly deselect and close | |
| 1275 inchannel, outchannel, and errchannel. */ | |
| 442 | 1276 int save_errno = errno; |
| 428 | 1277 close_descriptor_pair (forkin, forkout); |
| 853 | 1278 if (separate_err) |
| 1279 retry_close (forkerr); | |
| 442 | 1280 errno = save_errno; |
| 563 | 1281 report_process_error ("Doing fork", Qunbound); |
| 428 | 1282 } |
| 1283 | |
| 1284 /* #### dmoore - why is this commented out, otherwise we leave | |
| 1285 subtty = forkin, but then we close forkin just below. */ | |
| 853 | 1286 /* UNIX_DATA (p)->subtty = -1; */ |
| 428 | 1287 |
| 1288 /* If the subfork execv fails, and it exits, | |
| 1289 this close hangs. I don't know why. | |
| 1290 So have an interrupt jar it loose. */ | |
| 1291 if (forkin >= 0) | |
| 1292 close_safely (forkin); | |
| 1293 if (forkin != forkout && forkout >= 0) | |
| 771 | 1294 retry_close (forkout); |
| 853 | 1295 if (separate_err) |
| 1296 retry_close (forkerr); | |
| 428 | 1297 |
|
4953
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function renamings to track names of char typedefs
Ben Wing <ben@xemacs.org>
parents:
4952
diff
changeset
|
1298 p->tty_name = pty_flag ? build_istring (pty_name) : Qnil; |
| 428 | 1299 |
| 1300 /* Notice that SIGCHLD was not blocked. (This is not possible on | |
| 1301 some systems.) No biggie if SIGCHLD occurs right around the | |
| 1302 time that this call happens, because SIGCHLD() does not actually | |
| 1303 deselect the process (that doesn't occur until the next time | |
| 1304 we're waiting for an event, when status_notify() is called). */ | |
| 1305 return pid; | |
| 1306 | |
| 853 | 1307 io_failure: |
| 428 | 1308 { |
| 1309 int save_errno = errno; | |
| 1310 close_descriptor_pair (forkin, forkout); | |
| 1311 close_descriptor_pair (inchannel, outchannel); | |
| 853 | 1312 close_descriptor_pair (forkerr, errchannel); |
| 428 | 1313 errno = save_errno; |
| 563 | 1314 report_process_error ("Opening pty or pipe", Qunbound); |
| 1204 | 1315 RETURN_NOT_REACHED (0); |
| 428 | 1316 } |
| 1317 } | |
| 1318 | |
| 1319 /* Return nonzero if this process is a ToolTalk connection. */ | |
| 1320 | |
| 1321 static int | |
| 440 | 1322 unix_tooltalk_connection_p (Lisp_Process *p) |
| 428 | 1323 { |
| 853 | 1324 return UNIX_DATA (p)->connected_via_filedesc_p; |
| 428 | 1325 } |
| 1326 | |
| 1327 /* This is called to set process' virtual terminal size */ | |
| 1328 | |
| 1329 static int | |
| 853 | 1330 unix_set_window_size (Lisp_Process *p, int cols, int rows) |
| 428 | 1331 { |
| 853 | 1332 return set_window_size (UNIX_DATA (p)->infd, cols, rows); |
| 428 | 1333 } |
| 1334 | |
| 1335 /* | |
| 1336 * This method is called to update status fields of the process | |
| 1337 * structure. If the process has not existed, this method is | |
| 1338 * expected to do nothing. | |
| 1339 * | |
| 1340 * The method is called only for real child processes. | |
| 1341 */ | |
| 1342 | |
| 1343 #ifdef HAVE_WAITPID | |
| 1344 static void | |
| 853 | 1345 unix_update_status_if_terminated (Lisp_Process *p) |
| 428 | 1346 { |
| 1347 int w; | |
| 1348 #ifdef SIGCHLD | |
| 1349 EMACS_BLOCK_SIGNAL (SIGCHLD); | |
| 1350 #endif | |
|
5581
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Mechanically change INT to FIXNUM in our sources.
Aidan Kehoe <kehoea@parhasard.net>
parents:
5438
diff
changeset
|
1351 if (waitpid (XFIXNUM (p->pid), &w, WNOHANG) == XFIXNUM (p->pid)) |
| 428 | 1352 { |
| 1353 p->tick++; | |
| 1354 update_status_from_wait_code (p, &w); | |
| 1355 } | |
| 1356 #ifdef SIGCHLD | |
| 1357 EMACS_UNBLOCK_SIGNAL (SIGCHLD); | |
| 1358 #endif | |
| 1359 } | |
| 1360 #endif | |
| 1361 | |
| 1362 /* | |
| 1363 * Update status of all exited processes. Called when SIGCLD has signaled. | |
| 1364 */ | |
| 1365 | |
| 1366 #ifdef SIGCHLD | |
| 1367 static void | |
| 1368 unix_reap_exited_processes (void) | |
| 1369 { | |
| 1370 int i; | |
| 440 | 1371 Lisp_Process *p; |
| 428 | 1372 |
| 1373 #ifndef OBNOXIOUS_SYSV_SIGCLD_BEHAVIOR | |
| 1374 record_exited_processes (1); | |
| 1375 #endif | |
| 1376 | |
| 1377 if (exited_processes_index <= 0) | |
| 1378 { | |
| 1379 return; | |
| 1380 } | |
| 1381 | |
| 853 | 1382 #ifdef EMACS_BLOCK_SIGNAL |
| 428 | 1383 EMACS_BLOCK_SIGNAL (SIGCHLD); |
| 1384 #endif | |
| 1385 for (i = 0; i < exited_processes_index; i++) | |
| 1386 { | |
| 1387 int pid = exited_processes[i]; | |
| 1388 int w = exited_processes_status[i]; | |
| 1389 | |
| 1390 /* Find the process that signaled us, and record its status. */ | |
| 1391 | |
| 1392 p = 0; | |
| 1393 { | |
| 1394 Lisp_Object tail; | |
| 1395 LIST_LOOP (tail, Vprocess_list) | |
| 1396 { | |
| 1397 Lisp_Object proc = XCAR (tail); | |
| 1398 p = XPROCESS (proc); | |
|
5581
56144c8593a8
Mechanically change INT to FIXNUM in our sources.
Aidan Kehoe <kehoea@parhasard.net>
parents:
5438
diff
changeset
|
1399 if (FIXNUMP (p->pid) && XFIXNUM (p->pid) == pid) |
| 428 | 1400 break; |
| 1401 p = 0; | |
| 1402 } | |
| 1403 } | |
| 1404 | |
| 1405 if (p) | |
| 1406 { | |
| 1407 /* Change the status of the process that was found. */ | |
| 1408 p->tick++; | |
| 1409 process_tick++; | |
| 1410 update_status_from_wait_code (p, &w); | |
| 1411 | |
| 1412 /* If process has terminated, stop waiting for its output. */ | |
| 1413 if (WIFSIGNALED (w) || WIFEXITED (w)) | |
| 1414 { | |
| 853 | 1415 if (!NILP (p->pipe_instream)) |
| 428 | 1416 { |
| 1417 /* We can't just call event_stream->unselect_process_cb (p) | |
| 1418 here, because that calls XtRemoveInput, which is not | |
| 1419 necessarily reentrant, so we can't call this at interrupt | |
| 1420 level. | |
| 1421 */ | |
| 1422 } | |
| 1423 } | |
| 1424 } | |
| 853 | 1425 #ifdef NEED_SYNC_PROCESS_CODE |
| 428 | 1426 else |
| 1427 { | |
| 1428 /* There was no asynchronous process found for that id. Check | |
| 1429 if we have a synchronous process. Only set sync process status | |
| 1430 if there is one, so we work OK with the waitpid() call in | |
| 1431 wait_for_termination(). */ | |
| 1432 if (synch_process_alive != 0) | |
| 1433 { /* Set the global sync process status variables. */ | |
| 1434 synch_process_alive = 0; | |
| 1435 | |
| 1436 /* Report the status of the synchronous process. */ | |
| 1437 if (WIFEXITED (w)) | |
| 1438 synch_process_retcode = WEXITSTATUS (w); | |
| 1439 else if (WIFSIGNALED (w)) | |
| 1440 synch_process_death = signal_name (WTERMSIG (w)); | |
| 1441 } | |
| 1442 } | |
| 853 | 1443 #endif /* NEED_SYNC_PROCESS_CODE */ |
| 428 | 1444 } |
| 1445 | |
| 1446 exited_processes_index = 0; | |
| 1447 | |
| 1448 EMACS_UNBLOCK_SIGNAL (SIGCHLD); | |
| 1449 } | |
| 1450 #endif /* SIGCHLD */ | |
| 1451 | |
| 1452 /* | |
| 1453 * Stuff the entire contents of LSTREAM to the process output pipe | |
| 1454 */ | |
| 1455 | |
| 1456 static JMP_BUF send_process_frame; | |
| 1457 | |
| 1458 static SIGTYPE | |
| 1459 send_process_trap (int signum) | |
| 1460 { | |
| 1461 EMACS_REESTABLISH_SIGNAL (signum, send_process_trap); | |
| 1462 EMACS_UNBLOCK_SIGNAL (signum); | |
| 1463 LONGJMP (send_process_frame, 1); | |
| 1464 } | |
| 1465 | |
| 1466 static void | |
| 853 | 1467 unix_send_process (Lisp_Object proc, struct lstream *lstream) |
| 428 | 1468 { |
| 1111 | 1469 /* See comment lisp.h circa line 787 */ |
| 1470 SIGTYPE (*VOLATILE_IF_NOT_CPP old_sigpipe) (int) = 0; | |
| 1471 VOLATILE_IF_NOT_CPP Lisp_Object vol_proc = proc; | |
| 1472 Lisp_Process *VOLATILE_IF_NOT_CPP p = XPROCESS (proc); | |
| 428 | 1473 |
| 442 | 1474 /* #### JV: layering violation? |
| 1475 | |
| 1476 This function knows too much about the relation between the encoding | |
| 1477 stream (DATA_OUTSTREAM) and the actual output stream p->output_stream. | |
| 1478 | |
| 1479 If encoding streams properly forwarded all calls, we could simply | |
| 1480 use DATA_OUTSTREAM everywhere. */ | |
| 1481 | |
| 428 | 1482 if (!SETJMP (send_process_frame)) |
| 1483 { | |
| 1484 /* use a reasonable-sized buffer (somewhere around the size of the | |
| 1485 stream buffer) so as to avoid inundating the stream with blocked | |
| 1486 data. */ | |
| 867 | 1487 Ibyte chunkbuf[512]; |
| 428 | 1488 Bytecount chunklen; |
| 1489 | |
| 2566 | 1490 do |
| 428 | 1491 { |
| 771 | 1492 int writeret; |
| 428 | 1493 |
| 1494 chunklen = Lstream_read (lstream, chunkbuf, 512); | |
| 1495 old_sigpipe = | |
| 613 | 1496 (SIGTYPE (*) (int)) EMACS_SIGNAL (SIGPIPE, send_process_trap); |
| 2566 | 1497 if (chunklen > 0) |
| 1498 { | |
| 1499 int save_errno; | |
| 1500 | |
| 1501 /* Lstream_write() will never successfully write less than | |
| 1502 the amount sent in. In the worst case, it just buffers | |
| 1503 the unwritten data. */ | |
| 1504 writeret = Lstream_write (XLSTREAM (DATA_OUTSTREAM(p)), chunkbuf, | |
| 1505 chunklen); | |
| 1506 save_errno = errno; | |
| 1507 EMACS_SIGNAL (SIGPIPE, old_sigpipe); | |
| 1508 errno = save_errno; | |
| 1509 if (writeret < 0) | |
| 1510 /* This is a real error. Blocking errors are handled | |
| 1511 specially inside of the filedesc stream. */ | |
| 1512 report_file_error ("writing to process", list1 (proc)); | |
| 1513 } | |
| 1514 else | |
| 1515 { | |
| 1516 /* Need to make sure that everything up to and including the | |
| 1517 last chunk is flushed, even when the pipe is currently | |
| 1518 blocked. */ | |
| 1519 Lstream_flush (XLSTREAM (DATA_OUTSTREAM(p))); | |
| 1520 EMACS_SIGNAL (SIGPIPE, old_sigpipe); | |
| 1521 } | |
| 428 | 1522 while (Lstream_was_blocked_p (XLSTREAM (p->pipe_outstream))) |
| 1523 { | |
| 3325 | 1524 /* Buffer is full. Wait 10ms, accepting input; that may |
| 1525 allow the program to finish doing output and read more. | |
| 1526 Used to be 1s, but that's excruciating. nt_send_process | |
| 1527 uses geometrically increasing timeouts (up to 1s). This | |
| 1528 might be a good idea here. | |
| 1529 N.B. timeout_secs = Qnil is faster than Qzero. */ | |
|
5581
56144c8593a8
Mechanically change INT to FIXNUM in our sources.
Aidan Kehoe <kehoea@parhasard.net>
parents:
5438
diff
changeset
|
1530 Faccept_process_output (Qnil, Qnil, make_fixnum (10)); |
| 442 | 1531 /* It could have *really* finished, deleting the process */ |
| 1532 if (NILP(p->pipe_outstream)) | |
| 1533 return; | |
| 428 | 1534 old_sigpipe = |
| 613 | 1535 (SIGTYPE (*) (int)) EMACS_SIGNAL (SIGPIPE, send_process_trap); |
| 428 | 1536 Lstream_flush (XLSTREAM (p->pipe_outstream)); |
| 613 | 1537 EMACS_SIGNAL (SIGPIPE, old_sigpipe); |
| 428 | 1538 } |
| 2566 | 1539 /* Perhaps should ABORT() if < 0? This should never happen. */ |
| 428 | 1540 } |
| 2566 | 1541 while (chunklen > 0); |
| 428 | 1542 } |
| 1543 else | |
| 1544 { /* We got here from a longjmp() from the SIGPIPE handler */ | |
| 613 | 1545 EMACS_SIGNAL (SIGPIPE, old_sigpipe); |
| 428 | 1546 /* Close the file lstream so we don't attempt to write to it further */ |
| 1547 /* #### There is controversy over whether this might cause fd leakage */ | |
| 1548 /* my tests say no. -slb */ | |
| 1549 XLSTREAM (p->pipe_outstream)->flags &= ~LSTREAM_FL_IS_OPEN; | |
| 898 | 1550 XLSTREAM (p->coding_outstream)->flags &= ~LSTREAM_FL_IS_OPEN; |
| 428 | 1551 p->status_symbol = Qexit; |
| 1552 p->exit_code = 256; /* #### SIGPIPE ??? */ | |
| 1553 p->core_dumped = 0; | |
| 1554 p->tick++; | |
| 1555 process_tick++; | |
| 898 | 1556 deactivate_process (vol_proc); |
| 442 | 1557 invalid_operation ("SIGPIPE raised on process; closed it", p->name); |
| 428 | 1558 } |
| 1559 | |
| 613 | 1560 old_sigpipe = (SIGTYPE (*) (int)) EMACS_SIGNAL (SIGPIPE, send_process_trap); |
| 800 | 1561 Lstream_flush (XLSTREAM (DATA_OUTSTREAM (p))); |
| 613 | 1562 EMACS_SIGNAL (SIGPIPE, old_sigpipe); |
| 428 | 1563 } |
| 1564 | |
| 1565 /* | |
| 1566 * Send EOF to the process. The default implementation simply | |
| 1567 * closes the output stream. The method must return 0 to call | |
| 1568 * the default implementation, or 1 if it has taken all care about | |
| 1569 * sending EOF to the process. | |
| 1570 */ | |
| 1571 | |
| 1572 static int | |
| 1573 unix_process_send_eof (Lisp_Object proc) | |
| 1574 { | |
| 1575 if (!UNIX_DATA (XPROCESS (proc))->pty_flag) | |
| 1576 return 0; | |
| 1577 | |
| 1578 /* #### get_eof_char simply doesn't return the correct character | |
| 1579 here. Maybe it is needed to determine the right eof | |
| 1580 character in init_process_io_handles but here it simply screws | |
| 1581 things up. */ | |
| 1582 #if 0 | |
| 867 | 1583 Ibyte eof_char = get_eof_char (XPROCESS (proc)); |
| 428 | 1584 send_process (proc, Qnil, &eof_char, 0, 1); |
| 1585 #else | |
| 867 | 1586 send_process (proc, Qnil, (const Ibyte *) "\004", 0, 1); |
| 428 | 1587 #endif |
| 1588 return 1; | |
| 1589 } | |
| 1590 | |
| 1591 /* | |
| 1592 * Called before the process is deactivated. The process object | |
| 1593 * is not immediately finalized, just undergoes a transition to | |
| 1594 * inactive state. | |
| 1595 * | |
| 1596 * The return value is a unique stream ID, as returned by | |
| 853 | 1597 * event_stream_delete_io_streams |
| 428 | 1598 * |
| 853 | 1599 * In the lack of this method, only event_stream_delete_io_streams |
| 428 | 1600 * is called on both I/O streams of the process. |
| 1601 * | |
| 1602 * The UNIX version guards this by ignoring possible SIGPIPE. | |
| 1603 */ | |
| 1604 | |
| 853 | 1605 static void |
| 1606 unix_deactivate_process (Lisp_Process *p, | |
| 1607 USID *in_usid, | |
| 1608 USID *err_usid) | |
| 428 | 1609 { |
| 1610 SIGTYPE (*old_sigpipe) (int) = 0; | |
| 1611 | |
| 2367 | 1612 if (UNIX_DATA (p)->infd >= 0) |
| 1613 flush_pending_output (UNIX_DATA (p)->infd); | |
| 1614 if (UNIX_DATA (p)->errfd >= 0) | |
| 1615 flush_pending_output (UNIX_DATA (p)->errfd); | |
| 428 | 1616 |
| 1617 /* closing the outstream could result in SIGPIPE, so ignore it. */ | |
| 613 | 1618 old_sigpipe = (SIGTYPE (*) (int)) EMACS_SIGNAL (SIGPIPE, SIG_IGN); |
| 853 | 1619 event_stream_delete_io_streams (p->pipe_instream, p->pipe_outstream, |
| 1620 p->pipe_errstream, in_usid, err_usid); | |
| 613 | 1621 EMACS_SIGNAL (SIGPIPE, old_sigpipe); |
| 428 | 1622 |
| 2367 | 1623 UNIX_DATA (p)->infd = -1; |
| 1624 UNIX_DATA (p)->errfd = -1; | |
| 428 | 1625 } |
| 1626 | |
| 442 | 1627 /* If the subtty field of the process data is not filled in, do so now. */ |
| 1628 static void | |
| 1204 | 1629 try_to_initialize_subtty (Lisp_Process *p) |
| 442 | 1630 { |
| 1204 | 1631 struct unix_process_data *upd = UNIX_DATA (p); |
| 442 | 1632 if (upd->pty_flag |
| 444 | 1633 && (upd->subtty == -1 || ! isatty (upd->subtty)) |
| 1204 | 1634 && STRINGP (p->tty_name)) |
| 1635 upd->subtty = qxe_open (XSTRING_DATA (p->tty_name), O_RDWR, 0); | |
| 442 | 1636 } |
| 1637 | |
| 1638 /* Send signal number SIGNO to PROCESS. | |
| 428 | 1639 CURRENT_GROUP means send to the process group that currently owns |
| 1640 the terminal being used to communicate with PROCESS. | |
| 1641 This is used for various commands in shell mode. | |
| 1642 If NOMSG is zero, insert signal-announcements into process's buffers | |
| 1643 right away. | |
| 1644 | |
| 1645 If we can, we try to signal PROCESS by sending control characters | |
| 1646 down the pty. This allows us to signal inferiors who have changed | |
| 442 | 1647 their uid, for which killpg would return an EPERM error, |
| 1648 or processes running on other machines via remote login. | |
| 428 | 1649 |
| 442 | 1650 The method signals an error if the given SIGNO is not valid. */ |
| 428 | 1651 |
| 1652 static void | |
| 1653 unix_kill_child_process (Lisp_Object proc, int signo, | |
| 1654 int current_group, int nomsg) | |
| 1655 { | |
| 442 | 1656 pid_t pgid = -1; |
| 440 | 1657 Lisp_Process *p = XPROCESS (proc); |
| 442 | 1658 struct unix_process_data *d = UNIX_DATA (p); |
| 428 | 1659 |
| 1660 switch (signo) | |
| 1661 { | |
| 1662 #ifdef SIGCONT | |
| 1663 case SIGCONT: | |
| 1664 p->status_symbol = Qrun; | |
| 1665 p->exit_code = 0; | |
| 1666 p->tick++; | |
| 1667 process_tick++; | |
| 1668 if (!nomsg) | |
| 1669 status_notify (); | |
| 1670 break; | |
| 1671 #endif /* ! defined (SIGCONT) */ | |
| 1672 case SIGINT: | |
| 1673 case SIGQUIT: | |
| 1674 case SIGKILL: | |
| 442 | 1675 flush_pending_output (d->infd); |
| 853 | 1676 flush_pending_output (d->errfd); |
| 428 | 1677 break; |
| 1678 } | |
| 1679 | |
| 442 | 1680 if (! d->pty_flag) |
| 1681 current_group = 0; | |
| 1682 | |
| 1683 /* If current_group is true, we want to send a signal to the | |
| 1684 foreground process group of the terminal our child process is | |
| 1685 running on. You would think that would be easy. | |
| 1686 | |
| 1687 The BSD people invented the TIOCPGRP ioctl to get the foreground | |
| 1688 process group of a tty. That, combined with killpg, gives us | |
| 1689 what we want. | |
| 1690 | |
| 1691 However, the POSIX standards people, in their infinite wisdom, | |
| 1692 have seen fit to only allow this for processes which have the | |
| 1693 terminal as controlling terminal, which doesn't apply to us. | |
| 1694 | |
| 1695 Sooo..., we have to do something non-standard. The ioctls | |
| 1696 TIOCSIGNAL, TIOCSIG, and TIOCSIGSEND send the signal directly on | |
| 1697 many systems. POSIX tcgetpgrp(), since it is *documented* as not | |
| 1698 doing what we want, is actually less likely to work than the BSD | |
| 1699 ioctl TIOCGPGRP it is supposed to obsolete. Sometimes we have to | |
| 1700 use TIOCGPGRP on the master end, sometimes the slave end | |
| 1701 (probably an AIX bug). So we better get a fd for the slave if we | |
| 444 | 1702 haven't got it yet. |
| 1703 | |
| 1704 Anal operating systems like SGI Irix and Compaq Tru64 adhere | |
| 1705 strictly to the letter of the law, so our hack doesn't work. | |
| 1706 The following fragment from an Irix header file is suggestive: | |
| 1707 | |
| 1708 #ifdef __notdef__ | |
| 1709 // this is not currently supported | |
| 1710 #define TIOCSIGNAL (tIOC|31) // pty: send signal to slave | |
| 1711 #endif | |
| 1712 | |
| 1713 On those systems where none of our tricks work, we just fall back | |
| 1714 to the non-current_group behavior and kill the process group of | |
| 1715 the child. | |
| 1716 */ | |
| 442 | 1717 if (current_group) |
| 428 | 1718 { |
| 1204 | 1719 try_to_initialize_subtty (p); |
| 442 | 1720 |
| 1721 #ifdef SIGNALS_VIA_CHARACTERS | |
| 1722 /* If possible, send signals to the entire pgrp | |
| 1723 by sending an input character to it. */ | |
| 1724 { | |
| 867 | 1725 Ibyte sigchar = process_signal_char (d->subtty, signo); |
| 442 | 1726 if (sigchar) |
| 1727 { | |
| 853 | 1728 send_process (proc, Qnil, &sigchar, 0, 1); |
| 442 | 1729 return; |
| 1730 } | |
| 1731 } | |
| 1732 #endif /* SIGNALS_VIA_CHARACTERS */ | |
| 1733 | |
| 1734 #ifdef TIOCGPGRP | |
| 1735 if (pgid == -1) | |
| 1736 ioctl (d->infd, TIOCGPGRP, &pgid); /* BSD */ | |
| 1737 if (pgid == -1 && d->subtty != -1) | |
| 1738 ioctl (d->subtty, TIOCGPGRP, &pgid); /* Only this works on AIX! */ | |
| 1739 #endif /* TIOCGPGRP */ | |
| 1740 | |
| 1741 if (pgid == -1) | |
| 428 | 1742 { |
| 442 | 1743 /* Many systems provide an ioctl to send a signal directly */ |
| 1744 #ifdef TIOCSIGNAL /* Solaris, HP-UX */ | |
| 1745 if (ioctl (d->infd, TIOCSIGNAL, signo) != -1) | |
| 1746 return; | |
| 1747 #endif /* TIOCSIGNAL */ | |
| 1748 | |
| 1749 #ifdef TIOCSIG /* BSD */ | |
| 1750 if (ioctl (d->infd, TIOCSIG, signo) != -1) | |
| 1751 return; | |
| 1752 #endif /* TIOCSIG */ | |
| 428 | 1753 } |
| 442 | 1754 } /* current_group */ |
| 428 | 1755 |
| 442 | 1756 if (pgid == -1) |
| 1757 /* Either current_group is 0, or we failed to get the foreground | |
| 1758 process group using the trickery above. So we fall back to | |
| 1759 sending the signal to the process group of our child process. | |
| 1760 Since this is often a shell that ignores signals like SIGINT, | |
| 1761 the shell's subprocess is killed, which is the desired effect. | |
| 1762 The process group of p->pid is always p->pid, since it was | |
| 1763 created as a process group leader. */ | |
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1764 pgid = XFIXNUM (p->pid); |
| 442 | 1765 |
| 1766 /* Finally send the signal. */ | |
| 1767 if (EMACS_KILLPG (pgid, signo) == -1) | |
| 458 | 1768 { |
| 1769 /* It's not an error if our victim is already dead. | |
| 462 | 1770 And we can't rely on the result of killing a zombie, since |
| 1771 XPG 4.2 requires that killing a zombie fail with ESRCH, | |
| 1772 while FIPS 151-2 requires that it succeeds! */ | |
| 458 | 1773 #ifdef ESRCH |
| 1774 if (errno != ESRCH) | |
| 1775 #endif | |
| 563 | 1776 signal_ferror_with_frob (Qio_error, lisp_strerror (errno), |
| 1777 "kill (pgid=%ld, signo=%ld) failed", | |
| 1778 (long) pgid, (long) signo); | |
| 458 | 1779 } |
| 428 | 1780 } |
| 1781 | |
| 442 | 1782 /* Send signal SIGCODE to any process in the system given its PID. |
| 1783 Return zero if successful, a negative number upon failure. */ | |
| 428 | 1784 |
| 1785 static int | |
| 1786 unix_kill_process_by_pid (int pid, int sigcode) | |
| 1787 { | |
| 1788 return kill (pid, sigcode); | |
| 1789 } | |
| 1790 | |
| 442 | 1791 /* Canonicalize host name HOST, and return its canonical form. |
| 1792 The default implementation just takes HOST for a canonical name. */ | |
| 428 | 1793 |
| 1794 #ifdef HAVE_SOCKETS | |
| 1795 static Lisp_Object | |
| 1796 unix_canonicalize_host_name (Lisp_Object host) | |
| 1797 { | |
| 502 | 1798 #ifdef USE_GETADDRINFO |
| 440 | 1799 struct addrinfo hints, *res; |
| 1800 static char addrbuf[NI_MAXHOST]; | |
| 1801 Lisp_Object canonname; | |
| 1802 int retval; | |
| 1803 char *ext_host; | |
| 1804 | |
| 1805 xzero (hints); | |
| 1806 hints.ai_flags = AI_CANONNAME; | |
| 724 | 1807 #ifdef IPV6_CANONICALIZE |
| 440 | 1808 hints.ai_family = AF_UNSPEC; |
| 724 | 1809 #else |
| 1810 hints.ai_family = PF_INET; | |
| 1811 #endif | |
| 440 | 1812 hints.ai_socktype = SOCK_STREAM; |
| 1813 hints.ai_protocol = 0; | |
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1814 ext_host = LISP_STRING_TO_EXTERNAL (host, Qunix_host_name_encoding); |
| 440 | 1815 retval = getaddrinfo (ext_host, NULL, &hints, &res); |
| 1816 if (retval != 0) | |
| 1817 { | |
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1818 maybe_signal_error_2 (Qio_error, "Canonicalizing host name", |
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1819 build_extstring (gai_strerror (retval), |
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1820 Qstrerror_encoding), |
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1821 host, Qprocess, ERROR_ME_DEBUG_WARN); |
| 440 | 1822 canonname = host; |
| 1823 } | |
| 1824 else | |
| 1825 { | |
| 1826 int gni = getnameinfo (res->ai_addr, res->ai_addrlen, | |
| 1827 addrbuf, sizeof(addrbuf), | |
| 1828 NULL, 0, NI_NUMERICHOST); | |
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1829 canonname = gni ? host : build_extstring (addrbuf, |
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1830 Qunix_host_name_encoding); |
| 440 | 1831 |
| 1832 freeaddrinfo (res); | |
| 1833 } | |
| 1834 | |
| 1835 return canonname; | |
| 502 | 1836 #else /* ! USE_GETADDRINFO */ |
| 428 | 1837 struct sockaddr_in address; |
| 1838 | |
| 1839 if (!get_internet_address (host, &address, ERROR_ME_NOT)) | |
| 1840 return host; | |
| 1841 | |
| 1842 if (address.sin_family == AF_INET) | |
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1843 return build_extstring (inet_ntoa (address.sin_addr), |
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1844 Qunix_host_name_encoding); |
| 428 | 1845 else |
| 1846 /* #### any clue what to do here? */ | |
| 1847 return host; | |
| 502 | 1848 #endif /* ! USE_GETADDRINFO */ |
| 428 | 1849 } |
| 1850 | |
| 442 | 1851 /* Open a TCP network connection to a given HOST/SERVICE. |
| 1852 Treated exactly like a normal process when reading and writing. | |
| 1853 Only differences are in status display and process deletion. | |
| 1854 A network connection has no PID; you cannot signal it. All you can | |
| 1855 do is deactivate and close it via delete-process. */ | |
| 428 | 1856 |
| 1857 static void | |
| 502 | 1858 unix_open_network_stream (Lisp_Object name, Lisp_Object host, |
| 1859 Lisp_Object service, Lisp_Object protocol, | |
| 1860 void **vinfd, void **voutfd) | |
| 428 | 1861 { |
| 4123 | 1862 EMACS_INT inch; |
| 1863 EMACS_INT outch; | |
| 502 | 1864 volatile int s = -1; |
| 428 | 1865 volatile int port; |
| 1866 volatile int retry = 0; | |
| 502 | 1867 volatile int xerrno = 0; |
| 1868 volatile int failed_connect = 0; | |
| 428 | 1869 int retval; |
| 1870 | |
| 1871 CHECK_STRING (host); | |
| 1872 | |
| 1873 if (!EQ (protocol, Qtcp) && !EQ (protocol, Qudp)) | |
| 563 | 1874 invalid_constant ("Unsupported protocol", protocol); |
| 428 | 1875 |
| 440 | 1876 { |
| 502 | 1877 #ifdef USE_GETADDRINFO |
| 1878 | |
| 440 | 1879 struct addrinfo hints, *res; |
| 1880 struct addrinfo * volatile lres; | |
| 771 | 1881 Extbyte *portstring; |
| 1882 Extbyte *ext_host; | |
| 1883 Extbyte portbuf[128]; | |
| 440 | 1884 /* |
| 1885 * Caution: service can either be a string or int. | |
| 1886 * Convert to a C string for later use by getaddrinfo. | |
| 1887 */ | |
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1888 if (FIXNUMP (service)) |
| 440 | 1889 { |
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1890 snprintf (portbuf, sizeof (portbuf), "%ld", (long) XFIXNUM (service)); |
| 440 | 1891 portstring = portbuf; |
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1892 port = htons ((unsigned short) XFIXNUM (service)); |
| 440 | 1893 } |
| 1894 else | |
| 1895 { | |
| 1896 CHECK_STRING (service); | |
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1897 portstring = LISP_STRING_TO_EXTERNAL (service, |
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1898 Qunix_service_name_encoding); |
| 440 | 1899 port = 0; |
| 1900 } | |
| 1901 | |
| 1902 xzero (hints); | |
| 1903 hints.ai_flags = 0; | |
| 1904 hints.ai_family = AF_UNSPEC; | |
| 1905 if (EQ (protocol, Qtcp)) | |
| 1906 hints.ai_socktype = SOCK_STREAM; | |
| 1907 else /* EQ (protocol, Qudp) */ | |
| 1908 hints.ai_socktype = SOCK_DGRAM; | |
| 1909 hints.ai_protocol = 0; | |
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1910 ext_host = LISP_STRING_TO_EXTERNAL (host, Qunix_host_name_encoding); |
| 440 | 1911 retval = getaddrinfo (ext_host, portstring, &hints, &res); |
| 1912 if (retval != 0) | |
| 1913 { | |
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1914 signal_error_2 (Qio_error, "Converting host name to IP address", |
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1915 build_extstring (gai_strerror (retval), |
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1916 Qstrerror_encoding), |
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1917 list2 (host, service)); |
| 440 | 1918 } |
| 1919 | |
| 1920 /* address loop */ | |
| 1921 for (lres = res; lres ; lres = lres->ai_next) | |
| 1922 | |
| 502 | 1923 #else /* !USE_GETADDRINFO */ |
| 440 | 1924 |
| 1925 struct sockaddr_in address; | |
| 502 | 1926 volatile int i; |
| 440 | 1927 |
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1928 if (FIXNUMP (service)) |
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1929 port = htons ((unsigned short) XFIXNUM (service)); |
| 440 | 1930 else |
| 1931 { | |
| 1932 struct servent *svc_info; | |
| 771 | 1933 Extbyte *servext; |
| 1934 | |
| 440 | 1935 CHECK_STRING (service); |
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1936 servext = LISP_STRING_TO_EXTERNAL (service, |
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1937 Qunix_service_name_encoding); |
| 440 | 1938 |
| 1939 if (EQ (protocol, Qtcp)) | |
| 771 | 1940 svc_info = getservbyname (servext, "tcp"); |
| 440 | 1941 else /* EQ (protocol, Qudp) */ |
| 771 | 1942 svc_info = getservbyname (servext, "udp"); |
| 428 | 1943 |
| 440 | 1944 if (svc_info == 0) |
| 442 | 1945 invalid_argument ("Unknown service", service); |
| 440 | 1946 port = svc_info->s_port; |
| 1947 } | |
| 428 | 1948 |
| 440 | 1949 get_internet_address (host, &address, ERROR_ME); |
| 1950 address.sin_port = port; | |
| 428 | 1951 |
| 502 | 1952 /* use a trivial address loop */ |
| 1953 for (i = 0; i < 1; i++) | |
| 1954 | |
| 1955 #endif /* !USE_GETADDRINFO */ | |
| 1956 { | |
| 1957 #ifdef USE_GETADDRINFO | |
| 1958 int family = lres->ai_family; | |
| 1959 #else | |
| 1960 int family = address.sin_family; | |
| 1961 #endif | |
| 1962 | |
| 1963 if (EQ (protocol, Qtcp)) | |
| 1964 s = socket (family, SOCK_STREAM, 0); | |
| 1965 else /* EQ (protocol, Qudp) */ | |
| 1966 s = socket (family, SOCK_DGRAM, 0); | |
| 1967 | |
| 1968 if (s < 0) | |
| 1969 { | |
| 1970 xerrno = errno; | |
| 1971 failed_connect = 0; | |
| 1972 continue; | |
| 1973 } | |
| 1974 | |
| 1975 loop: | |
| 1976 | |
| 1977 /* A system call interrupted with a SIGALRM or SIGIO comes back | |
| 1978 here, with can_break_system_calls reset to 0. */ | |
| 1979 SETJMP (break_system_call_jump); | |
| 1980 if (QUITP) | |
| 1981 { | |
| 853 | 1982 QUIT; |
| 502 | 1983 /* In case something really weird happens ... */ |
| 1984 } | |
| 1985 | |
| 1986 /* Break out of connect with a signal (it isn't otherwise possible). | |
| 1987 Thus you don't get screwed with a hung network. */ | |
| 1988 can_break_system_calls = 1; | |
| 1989 | |
| 1990 #ifdef USE_GETADDRINFO | |
| 1991 retval = connect (s, lres->ai_addr, lres->ai_addrlen); | |
| 1992 #else | |
| 1993 retval = connect (s, (struct sockaddr *) &address, sizeof (address)); | |
| 1994 #endif | |
| 1995 can_break_system_calls = 0; | |
| 1996 if (retval == -1 && errno != EISCONN) | |
| 1997 { | |
| 1998 xerrno = errno; | |
| 859 | 1999 |
| 2000 if (errno == EINTR || errno == EINPROGRESS || errno == EALREADY) | |
| 502 | 2001 goto loop; |
| 2002 if (errno == EADDRINUSE && retry < 20) | |
| 2003 { | |
| 2004 #ifdef __FreeBSD__ | |
| 2005 /* A delay here is needed on some FreeBSD systems, | |
| 2006 and it is harmless, since this retrying takes | |
| 2007 time anyway and should be infrequent. | |
| 2008 `sleep-for' allowed for quitting this loop with | |
| 2009 interrupts slowed down so it can't be used | |
| 2010 here. Async timers should already be disabled | |
| 2011 at this point so we can use `sleep'. | |
| 2012 | |
| 2013 (Again, this was not conditionalized on FreeBSD. | |
| 854 | 2014 Let's not mess up systems without the problem. --ben) |
| 502 | 2015 */ |
| 2016 sleep (1); | |
| 2017 #endif | |
| 2018 retry++; | |
| 2019 goto loop; | |
| 2020 } | |
| 2021 | |
| 2022 failed_connect = 1; | |
| 771 | 2023 retry_close (s); |
| 502 | 2024 s = -1; |
| 2025 continue; | |
| 2026 } | |
| 2027 | |
| 2028 #ifdef USE_GETADDRINFO | |
| 2029 if (port == 0) | |
| 2030 { | |
| 2031 int gni; | |
| 2032 char servbuf[NI_MAXSERV]; | |
| 2033 | |
| 2034 if (EQ (protocol, Qtcp)) | |
| 2035 gni = getnameinfo (lres->ai_addr, lres->ai_addrlen, | |
| 2036 NULL, 0, servbuf, sizeof(servbuf), | |
| 2037 NI_NUMERICSERV); | |
| 2038 else /* EQ (protocol, Qudp) */ | |
| 2039 gni = getnameinfo (lres->ai_addr, lres->ai_addrlen, | |
| 2040 NULL, 0, servbuf, sizeof(servbuf), | |
| 2041 NI_NUMERICSERV | NI_DGRAM); | |
| 2042 | |
| 2043 if (gni == 0) | |
| 2044 port = strtol (servbuf, NULL, 10); | |
| 2045 } | |
| 2046 | |
| 2047 break; | |
| 2048 #endif /* USE_GETADDRINFO */ | |
| 2049 } /* address loop */ | |
| 2050 | |
| 2051 #ifdef USE_GETADDRINFO | |
| 2052 freeaddrinfo (res); | |
| 2053 #endif | |
| 428 | 2054 |
| 440 | 2055 if (s < 0) |
| 502 | 2056 { |
| 2057 errno = xerrno; | |
| 428 | 2058 |
| 502 | 2059 if (failed_connect) |
| 563 | 2060 report_network_error ("connection failed", list3 (Qunbound, host, |
| 2061 name)); | |
| 502 | 2062 else |
| 563 | 2063 report_network_error ("error creating socket", name); |
| 440 | 2064 } |
| 2065 } | |
| 428 | 2066 |
| 2067 inch = s; | |
| 2068 outch = dup (s); | |
| 2069 if (outch < 0) | |
| 2070 { | |
| 563 | 2071 int save_errno = errno; |
| 771 | 2072 retry_close (s); /* this used to be leaked; from Kyle Jones */ |
| 563 | 2073 errno = save_errno; |
| 2074 report_network_error ("error duplicating socket", name); | |
| 428 | 2075 } |
| 2076 | |
| 2077 set_socket_nonblocking_maybe (inch, port, "tcp"); | |
| 2078 | |
| 502 | 2079 *vinfd = (void *) inch; |
| 2080 *voutfd = (void *) outch; | |
| 428 | 2081 } |
| 2082 | |
| 2083 | |
| 2084 #ifdef HAVE_MULTICAST | |
| 2085 | |
| 442 | 2086 /* Didier Verna <didier@xemacs.org> Nov. 28 1997. |
| 428 | 2087 |
| 2088 This function is similar to open-network-stream-internal, but provides a | |
| 2089 mean to open an UDP multicast connection instead of a TCP one. Like in the | |
| 2090 TCP case, the multicast connection will be seen as a sub-process, | |
| 2091 | |
| 2092 Some notes: | |
| 2093 - Normally, we should use sendto and recvfrom with non connected | |
| 2094 sockets. The current code doesn't allow us to do this. In the future, it | |
| 2095 would be a good idea to extend the process data structure in order to deal | |
| 2096 properly with the different types network connections. | |
| 2097 - For the same reason, when leaving a multicast group, it is better to make | |
| 2098 a setsockopt - IP_DROP_MEMBERSHIP before closing the descriptors. | |
| 2099 Unfortunately, this can't be done here because delete_process doesn't know | |
| 2100 about the kind of connection we have. However, this is not such an | |
| 2101 important issue. | |
| 2102 */ | |
| 2103 | |
| 2104 static void | |
| 442 | 2105 unix_open_multicast_group (Lisp_Object name, Lisp_Object dest, |
| 853 | 2106 Lisp_Object port, Lisp_Object ttl, void **vinfd, |
| 2107 void **voutfd) | |
| 428 | 2108 { |
| 2109 struct ip_mreq imr; | |
| 2110 struct sockaddr_in sa; | |
| 2111 struct protoent *udp; | |
| 4123 | 2112 EMACS_INT ws, rs; |
| 428 | 2113 int theport; |
| 2114 unsigned char thettl; | |
| 2115 int one = 1; /* For REUSEADDR */ | |
| 2116 int ret; | |
| 2117 volatile int retry = 0; | |
| 2118 | |
| 2119 CHECK_STRING (dest); | |
| 2120 | |
|
5307
c096d8051f89
Have NATNUMP give t for positive bignums; check limits appropriately.
Aidan Kehoe <kehoea@parhasard.net>
parents:
5013
diff
changeset
|
2121 check_integer_range (port, Qzero, make_integer (USHRT_MAX)); |
|
5581
56144c8593a8
Mechanically change INT to FIXNUM in our sources.
Aidan Kehoe <kehoea@parhasard.net>
parents:
5438
diff
changeset
|
2122 theport = htons ((unsigned short) XFIXNUM (port)); |
| 428 | 2123 |
|
5307
c096d8051f89
Have NATNUMP give t for positive bignums; check limits appropriately.
Aidan Kehoe <kehoea@parhasard.net>
parents:
5013
diff
changeset
|
2124 check_integer_range (ttl, Qzero, make_integer (UCHAR_MAX)); |
|
5581
56144c8593a8
Mechanically change INT to FIXNUM in our sources.
Aidan Kehoe <kehoea@parhasard.net>
parents:
5438
diff
changeset
|
2125 thettl = (unsigned char) XFIXNUM (ttl); |
| 428 | 2126 |
| 2127 if ((udp = getprotobyname ("udp")) == NULL) | |
| 563 | 2128 invalid_operation ("No info available for UDP protocol", Qunbound); |
| 428 | 2129 |
| 2130 /* Init the sockets. Yes, I need 2 sockets. I couldn't duplicate one. */ | |
| 2131 if ((rs = socket (PF_INET, SOCK_DGRAM, udp->p_proto)) < 0) | |
| 563 | 2132 report_network_error ("error creating socket", name); |
| 428 | 2133 if ((ws = socket (PF_INET, SOCK_DGRAM, udp->p_proto)) < 0) |
| 2134 { | |
| 563 | 2135 int save_errno = errno; |
| 771 | 2136 retry_close (rs); |
| 563 | 2137 errno = save_errno; |
| 2138 report_network_error ("error creating socket", name); | |
| 428 | 2139 } |
| 2140 | |
| 2141 /* This will be used for both sockets */ | |
| 2142 memset (&sa, 0, sizeof(sa)); | |
| 2143 sa.sin_family = AF_INET; | |
| 2144 sa.sin_port = theport; | |
| 671 | 2145 sa.sin_addr.s_addr = inet_addr ((char *) XSTRING_DATA (dest)); |
| 428 | 2146 |
| 2147 /* Socket configuration for reading ------------------------ */ | |
| 2148 | |
| 2149 /* Multiple connections from the same machine. This must be done before | |
| 2150 bind. If it fails, it shouldn't be fatal. The only consequence is that | |
| 2151 people won't be able to connect twice from the same machine. */ | |
| 2152 if (setsockopt (rs, SOL_SOCKET, SO_REUSEADDR, (char *) &one, sizeof (one)) | |
| 2153 < 0) | |
| 2154 warn_when_safe (Qmulticast, Qwarning, "Cannot reuse socket address"); | |
| 2155 | |
| 2156 /* bind socket name */ | |
| 2157 if (bind (rs, (struct sockaddr *)&sa, sizeof(sa))) | |
| 2158 { | |
| 563 | 2159 int save_errno = errno; |
| 771 | 2160 retry_close (rs); |
| 2161 retry_close (ws); | |
| 563 | 2162 errno = save_errno; |
| 2163 report_network_error ("error binding socket", list3 (Qunbound, name, | |
| 2164 port)); | |
| 428 | 2165 } |
| 2166 | |
| 2167 /* join multicast group */ | |
| 671 | 2168 imr.imr_multiaddr.s_addr = inet_addr ((char *) XSTRING_DATA (dest)); |
| 428 | 2169 imr.imr_interface.s_addr = htonl (INADDR_ANY); |
| 2170 if (setsockopt (rs, IPPROTO_IP, IP_ADD_MEMBERSHIP, | |
| 442 | 2171 &imr, sizeof (struct ip_mreq)) < 0) |
| 428 | 2172 { |
| 563 | 2173 int save_errno = errno; |
| 771 | 2174 retry_close (ws); |
| 2175 retry_close (rs); | |
| 563 | 2176 errno = save_errno; |
| 2177 report_network_error ("error adding membership", list3 (Qunbound, name, | |
| 2178 dest)); | |
| 428 | 2179 } |
| 2180 | |
| 2181 /* Socket configuration for writing ----------------------- */ | |
| 2182 | |
| 2183 /* Normally, there's no 'connect' in multicast, since we prefer to use | |
| 2184 'sendto' and 'recvfrom'. However, in order to handle this connection in | |
| 2185 the process-like way it is done for TCP, we must be able to use 'write' | |
| 2186 instead of 'sendto'. Consequently, we 'connect' this socket. */ | |
| 2187 | |
| 2188 /* See open-network-stream-internal for comments on this part of the code */ | |
| 2189 loop: | |
| 2190 | |
| 2191 /* A system call interrupted with a SIGALRM or SIGIO comes back | |
| 2192 here, with can_break_system_calls reset to 0. */ | |
| 2193 SETJMP (break_system_call_jump); | |
| 2194 if (QUITP) | |
| 2195 { | |
| 853 | 2196 QUIT; |
| 428 | 2197 /* In case something really weird happens ... */ |
| 2198 } | |
| 2199 | |
| 2200 /* Break out of connect with a signal (it isn't otherwise possible). | |
| 2201 Thus you don't get screwed with a hung network. */ | |
| 2202 can_break_system_calls = 1; | |
| 2203 ret = connect (ws, (struct sockaddr *) &sa, sizeof (sa)); | |
| 2204 can_break_system_calls = 0; | |
| 2205 if (ret == -1 && errno != EISCONN) | |
| 2206 { | |
| 2207 int xerrno = errno; | |
| 2208 | |
| 859 | 2209 if (errno == EINTR || errno == EINPROGRESS || errno == EALREADY) |
| 428 | 2210 goto loop; |
| 2211 if (errno == EADDRINUSE && retry < 20) | |
| 2212 { | |
| 859 | 2213 #ifdef __FreeBSD__ |
| 428 | 2214 /* A delay here is needed on some FreeBSD systems, |
| 2215 and it is harmless, since this retrying takes time anyway | |
| 2216 and should be infrequent. | |
| 2217 `sleep-for' allowed for quitting this loop with interrupts | |
| 2218 slowed down so it can't be used here. Async timers should | |
| 2219 already be disabled at this point so we can use `sleep'. */ | |
| 2220 sleep (1); | |
| 859 | 2221 #endif |
| 428 | 2222 retry++; |
| 2223 goto loop; | |
| 2224 } | |
| 2225 | |
| 771 | 2226 retry_close (rs); |
| 2227 retry_close (ws); | |
| 428 | 2228 |
| 2229 errno = xerrno; | |
| 563 | 2230 report_network_error ("error connecting socket", list3 (Qunbound, name, |
| 2231 port)); | |
| 428 | 2232 } |
| 2233 | |
| 2234 /* scope */ | |
| 2235 if (setsockopt (ws, IPPROTO_IP, IP_MULTICAST_TTL, | |
| 442 | 2236 &thettl, sizeof (thettl)) < 0) |
| 428 | 2237 { |
| 563 | 2238 int save_errno = errno; |
| 771 | 2239 retry_close (rs); |
| 2240 retry_close (ws); | |
| 563 | 2241 errno = save_errno; |
| 2242 report_network_error ("error setting ttl", list3 (Qunbound, name, ttl)); | |
| 428 | 2243 } |
| 2244 | |
| 2245 set_socket_nonblocking_maybe (rs, theport, "udp"); | |
| 2246 | |
| 2247 *vinfd = (void*)rs; | |
| 2248 *voutfd = (void*)ws; | |
| 2249 } | |
| 2250 | |
| 2251 #endif /* HAVE_MULTICAST */ | |
| 2252 | |
| 2253 #endif /* HAVE_SOCKETS */ | |
| 2254 | |
| 2255 | |
| 2256 /**********************************************************************/ | |
| 2257 /* Initialization */ | |
| 2258 /**********************************************************************/ | |
| 2259 | |
| 2260 void | |
| 2261 process_type_create_unix (void) | |
| 2262 { | |
| 2263 PROCESS_HAS_METHOD (unix, alloc_process_data); | |
| 2264 #ifdef SIGCHLD | |
| 2265 PROCESS_HAS_METHOD (unix, init_process); | |
| 2266 PROCESS_HAS_METHOD (unix, reap_exited_processes); | |
| 2267 #endif | |
| 2268 PROCESS_HAS_METHOD (unix, init_process_io_handles); | |
| 2269 PROCESS_HAS_METHOD (unix, create_process); | |
| 2270 PROCESS_HAS_METHOD (unix, tooltalk_connection_p); | |
| 2271 PROCESS_HAS_METHOD (unix, set_window_size); | |
| 2272 #ifdef HAVE_WAITPID | |
| 2273 PROCESS_HAS_METHOD (unix, update_status_if_terminated); | |
| 2274 #endif | |
| 2275 PROCESS_HAS_METHOD (unix, send_process); | |
| 2276 PROCESS_HAS_METHOD (unix, process_send_eof); | |
| 2277 PROCESS_HAS_METHOD (unix, deactivate_process); | |
| 2278 PROCESS_HAS_METHOD (unix, kill_child_process); | |
| 2279 PROCESS_HAS_METHOD (unix, kill_process_by_pid); | |
| 2280 #ifdef HAVE_SOCKETS | |
| 2281 PROCESS_HAS_METHOD (unix, canonicalize_host_name); | |
| 2282 PROCESS_HAS_METHOD (unix, open_network_stream); | |
| 2283 #ifdef HAVE_MULTICAST | |
| 2284 PROCESS_HAS_METHOD (unix, open_multicast_group); | |
| 2285 #endif | |
| 2286 #endif | |
| 2287 } | |
| 2288 | |
| 2289 void | |
| 2290 vars_of_process_unix (void) | |
| 2291 { | |
| 2292 Fprovide (intern ("unix-processes")); | |
| 2293 } |