|
0
|
1 /* Code shared between all event loops that use select() and have a
|
|
|
2 different input descriptor for each device.
|
|
|
3 Copyright (C) 1991, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
|
|
|
4 Copyright (C) 1995 Board of Trustees, University of Illinois.
|
|
|
5 Copyright (C) 1995 Sun Microsystems, Inc.
|
|
|
6 Copyright (C) 1995, 1996 Ben Wing.
|
|
|
7
|
|
|
8 This file is part of XEmacs.
|
|
|
9
|
|
|
10 XEmacs is free software; you can redistribute it and/or modify it
|
|
|
11 under the terms of the GNU General Public License as published by the
|
|
|
12 Free Software Foundation; either version 2, or (at your option) any
|
|
|
13 later version.
|
|
|
14
|
|
|
15 XEmacs is distributed in the hope that it will be useful, but WITHOUT
|
|
|
16 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
|
17 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
|
|
18 for more details.
|
|
|
19
|
|
|
20 You should have received a copy of the GNU General Public License
|
|
|
21 along with XEmacs; see the file COPYING. If not, write to
|
|
|
22 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
|
23 Boston, MA 02111-1307, USA. */
|
|
|
24
|
|
|
25 /* Synched up with: Not in FSF. */
|
|
|
26
|
|
|
27 /* This file has been Mule-ized. */
|
|
|
28
|
|
|
29 #include <config.h>
|
|
|
30 #include "lisp.h"
|
|
|
31
|
|
|
32 #include "console-stream.h"
|
|
|
33 #include "console-tty.h"
|
|
|
34 #include "device.h"
|
|
|
35 #include "events.h"
|
|
263
|
36 #include "lstream.h"
|
|
0
|
37 #include "process.h"
|
|
|
38
|
|
|
39 #include "sysdep.h"
|
|
272
|
40 #include "sysfile.h"
|
|
0
|
41 #include "sysproc.h" /* select stuff */
|
|
|
42 #include "systime.h"
|
|
|
43
|
|
|
44 /* Mask of bits indicating the descriptors that we wait for input on.
|
|
|
45 These work as follows:
|
|
|
46
|
|
|
47 input_wait_mask == mask of all file descriptors we select() on,
|
|
|
48 including TTY/stream console descriptors,
|
|
|
49 process descriptors, and the signal event pipe.
|
|
|
50 Only used in event-tty.c; event-Xt.c uses
|
|
|
51 XtAppAddInput(), and the call to select() is down in
|
|
|
52 the guts of Xt.
|
|
|
53
|
|
|
54 non_fake_input_wait_mask == same as input_wait_mask but minus the
|
|
|
55 signal event pipe. Also only used in
|
|
|
56 event-tty.c.
|
|
|
57
|
|
|
58 process_only_mask == only the process descriptors.
|
|
|
59
|
|
|
60 tty_only_mask == only the TTY/stream console descriptors.
|
|
|
61 */
|
|
|
62 SELECT_TYPE input_wait_mask, non_fake_input_wait_mask;
|
|
|
63 SELECT_TYPE process_only_mask, tty_only_mask;
|
|
|
64
|
|
|
65 /* This is used to terminate the select(), when an event came in
|
|
|
66 through a signal (e.g. window-change or C-g on controlling TTY). */
|
|
|
67 int signal_event_pipe[2];
|
|
|
68
|
|
278
|
69 int signal_event_pipe_initialized;
|
|
0
|
70
|
|
|
71 int fake_event_occurred;
|
|
|
72
|
|
|
73 int
|
|
398
|
74 read_event_from_tty_or_stream_desc (Lisp_Event *event,
|
|
0
|
75 struct console *con, int fd)
|
|
|
76 {
|
|
|
77 unsigned char ch;
|
|
|
78 int nread;
|
|
272
|
79 Lisp_Object console;
|
|
0
|
80
|
|
|
81 XSETCONSOLE (console, con);
|
|
|
82
|
|
|
83 nread = read (fd, &ch, 1);
|
|
|
84 if (nread <= 0)
|
|
|
85 {
|
|
|
86 /* deleting the console might not be safe right now ... */
|
|
|
87 enqueue_magic_eval_event (io_error_delete_console, console);
|
|
|
88 /* but we definitely need to unselect it to avoid infinite
|
|
|
89 loops reading EOF's */
|
|
|
90 Fconsole_disable_input (console);
|
|
|
91 }
|
|
|
92 else
|
|
|
93 {
|
|
263
|
94 character_to_event (ch, event, con, 1, 1);
|
|
0
|
95 event->channel = console;
|
|
|
96 return 1;
|
|
|
97 }
|
|
|
98 return 0;
|
|
|
99 }
|
|
|
100
|
|
|
101 void
|
|
|
102 signal_fake_event (void)
|
|
|
103 {
|
|
|
104 char byte = 0;
|
|
|
105 /* We do the write always. Formerly I tried to "optimize" this
|
|
|
106 by setting a flag indicating whether we're blocking and only
|
|
|
107 doing the write in that case, but there is a race condition
|
|
|
108 if the signal occurs after we've checked for the signal
|
|
|
109 occurrence (which could occur in many places throughout
|
|
|
110 an iteration of the command loop, e.g. in status_notify()),
|
|
|
111 but before we set the blocking flag.
|
|
|
112
|
|
|
113 This should be OK as long as write() is reentrant, which
|
|
|
114 I'm fairly sure it is since it's a system call. */
|
|
|
115
|
|
|
116 if (signal_event_pipe_initialized)
|
|
|
117 /* In case a signal comes through while we're dumping */
|
|
|
118 {
|
|
|
119 int old_errno = errno;
|
|
|
120 write (signal_event_pipe[1], &byte, 1);
|
|
|
121 errno = old_errno;
|
|
|
122 }
|
|
|
123 }
|
|
|
124
|
|
|
125 void
|
|
|
126 drain_signal_event_pipe (void)
|
|
|
127 {
|
|
|
128 char chars[128];
|
|
|
129 /* The input end of the pipe has been set to non-blocking. */
|
|
|
130 while (read (signal_event_pipe[0], chars, sizeof (chars)) > 0)
|
|
|
131 ;
|
|
|
132 }
|
|
|
133
|
|
|
134 int
|
|
|
135 event_stream_unixoid_select_console (struct console *con)
|
|
|
136 {
|
|
|
137 int infd;
|
|
|
138
|
|
|
139 if (CONSOLE_STREAM_P (con))
|
|
396
|
140 infd = fileno (CONSOLE_STREAM_DATA (con)->in);
|
|
0
|
141 else
|
|
|
142 {
|
|
|
143 assert (CONSOLE_TTY_P (con));
|
|
|
144 infd = CONSOLE_TTY_DATA (con)->infd;
|
|
|
145 }
|
|
|
146
|
|
|
147 assert (infd >= 0);
|
|
|
148
|
|
|
149 FD_SET (infd, &input_wait_mask);
|
|
|
150 FD_SET (infd, &non_fake_input_wait_mask);
|
|
|
151 FD_SET (infd, &tty_only_mask);
|
|
|
152 return infd;
|
|
|
153 }
|
|
|
154
|
|
|
155 int
|
|
|
156 event_stream_unixoid_unselect_console (struct console *con)
|
|
|
157 {
|
|
|
158 int infd;
|
|
|
159
|
|
|
160 if (CONSOLE_STREAM_P (con))
|
|
396
|
161 infd = fileno (CONSOLE_STREAM_DATA (con)->in);
|
|
0
|
162 else
|
|
|
163 {
|
|
|
164 assert (CONSOLE_TTY_P (con));
|
|
|
165 infd = CONSOLE_TTY_DATA (con)->infd;
|
|
|
166 }
|
|
|
167
|
|
|
168 assert (infd >= 0);
|
|
|
169
|
|
|
170 FD_CLR (infd, &input_wait_mask);
|
|
|
171 FD_CLR (infd, &non_fake_input_wait_mask);
|
|
|
172 FD_CLR (infd, &tty_only_mask);
|
|
|
173 return infd;
|
|
|
174 }
|
|
|
175
|
|
263
|
176 static int
|
|
398
|
177 get_process_infd (Lisp_Process *p)
|
|
263
|
178 {
|
|
|
179 Lisp_Object instr, outstr;
|
|
|
180 get_process_streams (p, &instr, &outstr);
|
|
|
181 assert (!NILP (instr));
|
|
|
182 return filedesc_stream_fd (XLSTREAM (instr));
|
|
|
183 }
|
|
|
184
|
|
0
|
185 int
|
|
398
|
186 event_stream_unixoid_select_process (Lisp_Process *proc)
|
|
0
|
187 {
|
|
263
|
188 int infd = get_process_infd (proc);
|
|
0
|
189
|
|
|
190 FD_SET (infd, &input_wait_mask);
|
|
|
191 FD_SET (infd, &non_fake_input_wait_mask);
|
|
|
192 FD_SET (infd, &process_only_mask);
|
|
|
193 return infd;
|
|
|
194 }
|
|
|
195
|
|
|
196 int
|
|
398
|
197 event_stream_unixoid_unselect_process (Lisp_Process *proc)
|
|
0
|
198 {
|
|
263
|
199 int infd = get_process_infd (proc);
|
|
0
|
200
|
|
|
201 FD_CLR (infd, &input_wait_mask);
|
|
|
202 FD_CLR (infd, &non_fake_input_wait_mask);
|
|
|
203 FD_CLR (infd, &process_only_mask);
|
|
|
204 return infd;
|
|
|
205 }
|
|
|
206
|
|
|
207 int
|
|
|
208 poll_fds_for_input (SELECT_TYPE mask)
|
|
|
209 {
|
|
|
210 EMACS_TIME sometime;
|
|
|
211 EMACS_SELECT_TIME select_time;
|
|
|
212 SELECT_TYPE temp_mask;
|
|
|
213 int retval;
|
|
|
214
|
|
|
215 while (1)
|
|
|
216 {
|
|
|
217 EMACS_SET_SECS_USECS (sometime, 0, 0);
|
|
|
218 EMACS_TIME_TO_SELECT_TIME (sometime, select_time);
|
|
|
219 temp_mask = mask;
|
|
|
220 /* To effect a poll, tell select() to block for zero seconds. */
|
|
|
221 retval = select (MAXDESC, &temp_mask, 0, 0, &select_time);
|
|
|
222 if (retval >= 0)
|
|
|
223 return retval;
|
|
|
224 if (errno != EINTR)
|
|
|
225 {
|
|
|
226 /* Something went seriously wrong; don't abort since maybe
|
|
|
227 the TTY just died at the wrong time. */
|
|
404
|
228 stderr_out ("xemacs: select failed: errno = %d\n", errno);
|
|
0
|
229 return 0;
|
|
|
230 }
|
|
|
231 /* else, we got interrupted by a signal, so try again. */
|
|
|
232 }
|
|
|
233
|
|
|
234 RETURN_NOT_REACHED(0) /* not reached */
|
|
|
235 }
|
|
263
|
236
|
|
|
237 /****************************************************************************/
|
|
|
238 /* Unixoid (file descriptors based) process I/O streams routines */
|
|
|
239 /****************************************************************************/
|
|
|
240
|
|
|
241 USID
|
|
|
242 event_stream_unixoid_create_stream_pair (void* inhandle, void* outhandle,
|
|
|
243 Lisp_Object* instream,
|
|
|
244 Lisp_Object* outstream,
|
|
|
245 int flags)
|
|
|
246 {
|
|
|
247 int infd, outfd;
|
|
|
248 /* Decode inhandle and outhandle. Their meaning depends on
|
|
|
249 the process implementation being used. */
|
|
282
|
250 #if defined (HAVE_WIN32_PROCESSES)
|
|
263
|
251 /* We're passed in Windows handles. Open new fds for them */
|
|
|
252 if ((HANDLE)inhandle != INVALID_HANDLE_VALUE)
|
|
|
253 {
|
|
|
254 infd = open_osfhandle ((HANDLE)inhandle, 0);
|
|
|
255 if (infd < 0)
|
|
|
256 return USID_ERROR;
|
|
|
257 }
|
|
|
258 else
|
|
|
259 infd = -1;
|
|
|
260
|
|
|
261 if ((HANDLE)outhandle != INVALID_HANDLE_VALUE)
|
|
|
262 {
|
|
|
263 outfd = open_osfhandle ((HANDLE)outhandle, 0);
|
|
|
264 if (outfd < 0)
|
|
|
265 {
|
|
|
266 if (infd >= 0)
|
|
|
267 close (infd);
|
|
|
268 return USID_ERROR;
|
|
|
269 }
|
|
|
270 }
|
|
|
271 else
|
|
|
272 outfd = -1;
|
|
|
273
|
|
|
274 flags = 0;
|
|
282
|
275 #elif defined (HAVE_UNIX_PROCESSES)
|
|
263
|
276 /* We are passed plain old file descs */
|
|
|
277 infd = (int)inhandle;
|
|
|
278 outfd = (int)outhandle;
|
|
282
|
279 #else
|
|
|
280 # error Which processes do you have?
|
|
263
|
281 #endif
|
|
|
282
|
|
|
283 *instream = (infd >= 0
|
|
|
284 ? make_filedesc_input_stream (infd, 0, -1, 0)
|
|
|
285 : Qnil);
|
|
|
286
|
|
|
287 *outstream = (outfd >= 0
|
|
|
288 ? make_filedesc_output_stream (outfd, 0, -1, LSTR_BLOCKED_OK)
|
|
|
289 : Qnil);
|
|
|
290
|
|
|
291 #if defined(HAVE_UNIX_PROCESSES) && defined(HAVE_PTYS)
|
|
|
292 /* FLAGS is process->pty_flag for UNIX_PROCESSES */
|
|
282
|
293 if ((flags & STREAM_PTY_FLUSHING) && outfd >= 0)
|
|
263
|
294 {
|
|
|
295 Bufbyte eof_char = get_eof_char (outfd);
|
|
|
296 int pty_max_bytes = get_pty_max_bytes (outfd);
|
|
|
297 filedesc_stream_set_pty_flushing (XLSTREAM(*outstream), pty_max_bytes, eof_char);
|
|
|
298 }
|
|
|
299 #endif
|
|
|
300
|
|
|
301 return FD_TO_USID (infd);
|
|
|
302 }
|
|
|
303
|
|
|
304 USID
|
|
|
305 event_stream_unixoid_delete_stream_pair (Lisp_Object instream,
|
|
|
306 Lisp_Object outstream)
|
|
|
307 {
|
|
|
308 int in = (NILP(instream) ? -1
|
|
|
309 : filedesc_stream_fd (XLSTREAM (instream)));
|
|
|
310 int out = (NILP(outstream) ? -1
|
|
|
311 : filedesc_stream_fd (XLSTREAM (outstream)));
|
|
|
312
|
|
|
313 if (in >= 0)
|
|
|
314 close (in);
|
|
|
315 if (out != in && out >= 0)
|
|
|
316 close (out);
|
|
|
317
|
|
|
318 return FD_TO_USID (in);
|
|
|
319 }
|
|
0
|
320
|
|
|
321
|
|
|
322 void
|
|
|
323 init_event_unixoid (void)
|
|
|
324 {
|
|
|
325 /* Do this first; the init_event_*_late() functions
|
|
|
326 pay attention to it. */
|
|
|
327 if (pipe (signal_event_pipe) < 0)
|
|
|
328 {
|
|
|
329 perror ("XEmacs: can't open pipe");
|
|
|
330 exit (-1);
|
|
|
331 }
|
|
|
332 signal_event_pipe_initialized = 1;
|
|
185
|
333
|
|
0
|
334 /* Set it non-blocking so we can drain its output. */
|
|
|
335 set_descriptor_non_blocking (signal_event_pipe[0]);
|
|
185
|
336
|
|
0
|
337 /* Also set the write descriptor non-blocking so we don't
|
|
|
338 hang in case a long time passes between times when
|
|
|
339 we drain the pipe. */
|
|
|
340 set_descriptor_non_blocking (signal_event_pipe[1]);
|
|
185
|
341
|
|
0
|
342 /* WARNING: In order for the signal-event pipe to work correctly
|
|
|
343 and not cause lockups, the following need to be followed:
|
|
185
|
344
|
|
0
|
345 1) event_pending_p() must ignore input on the signal-event pipe.
|
|
|
346 2) As soon as next_event() notices input on the signal-event
|
|
|
347 pipe, it must drain it. */
|
|
|
348 FD_ZERO (&input_wait_mask);
|
|
|
349 FD_ZERO (&non_fake_input_wait_mask);
|
|
|
350 FD_ZERO (&process_only_mask);
|
|
|
351 FD_ZERO (&tty_only_mask);
|
|
185
|
352
|
|
0
|
353 FD_SET (signal_event_pipe[0], &input_wait_mask);
|
|
|
354 }
|
