Mercurial > hg > xemacs-beta
annotate src/process-unix.c @ 5518:3cc7470ea71c
gnuclient: if TMPDIR was set and connect failed, try again with /tmp
2011-06-03 Aidan Kehoe <kehoea@parhasard.net>
* gnuslib.c (connect_to_unix_server):
Retry with /tmp as a directory in which to search for Unix sockets
if an attempt to connect with some other directory failed (which
may be because gnuclient and gnuserv don't share an environment
value for TMPDIR, or because gnuserv was compiled with USE_TMPDIR
turned off).
| author | Aidan Kehoe <kehoea@parhasard.net> |
|---|---|
| date | Fri, 03 Jun 2011 18:40:57 +0100 |
| parents | 8d29f1c4bb98 |
| children | 56144c8593a8 |
| 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); | |
| 174 CHECK_INT (infd); | |
| 175 CHECK_INT (outfd); | |
| 176 | |
| 177 inch = XINT (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, |
| 187 (void *) XINT (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; | |
| 467 Fsleep_for (make_int (1)); | |
| 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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4953
diff
changeset
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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); |
|
4981
4aebb0131297
Cleanups/renaming of EXTERNAL_TO_C_STRING and friends
Ben Wing <ben@xemacs.org>
parents:
4953
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), |
|
4aebb0131297
Cleanups/renaming of EXTERNAL_TO_C_STRING and friends
Ben Wing <ben@xemacs.org>
parents:
4953
diff
changeset
|
525 proto); |
| 428 | 526 if ((svc_info != 0) && (svc_info->s_port == port)) |
| 527 break; | |
| 528 else | |
| 529 continue; | |
| 530 } | |
| 531 else if (INTP (tail_port) && (htons ((unsigned short) XINT (tail_port)) == port)) | |
| 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. */ | |
| 867 | 930 env = alloca_array (Ibyte *, XINT (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
304aebb79cd3
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 | |
| 1351 if (waitpid (XINT (p->pid), &w, WNOHANG) == XINT (p->pid)) | |
| 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); | |
| 1399 if (INTP (p->pid) && XINT (p->pid) == pid) | |
| 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. */ | |
| 1530 Faccept_process_output (Qnil, Qnil, make_int (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. */ | |
| 1764 pgid = XINT (p->pid); | |
| 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 */ | |
| 1888 if (INTP (service)) | |
| 1889 { | |
| 1890 snprintf (portbuf, sizeof (portbuf), "%ld", (long) XINT (service)); | |
| 1891 portstring = portbuf; | |
| 1892 port = htons ((unsigned short) XINT (service)); | |
| 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 |
| 1928 if (INTP (service)) | |
| 1929 port = htons ((unsigned short) XINT (service)); | |
| 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)); |
| 428 | 2122 theport = htons ((unsigned short) XINT (port)); |
| 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)); |
| 428 | 2125 thettl = (unsigned char) XINT (ttl); |
| 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 } |