Commit | Line | Data |
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6cdfb6e6 | 1 | /* Process support for Windows NT port of GNU EMACS. |
22759c72 | 2 | Copyright (C) 1992, 1995 Free Software Foundation, Inc. |
6cdfb6e6 | 3 | |
3b7ad313 EN |
4 | This file is part of GNU Emacs. |
5 | ||
6 | GNU Emacs is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2, or (at your option) | |
9 | any later version. | |
10 | ||
11 | GNU Emacs is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GNU Emacs; see the file COPYING. If not, write to | |
18 | the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
19 | Boston, MA 02111-1307, USA. | |
6cdfb6e6 RS |
20 | |
21 | Drew Bliss Oct 14, 1993 | |
22 | Adapted from alarm.c by Tim Fleehart | |
23 | */ | |
24 | ||
6816efce GV |
25 | #include <config.h> |
26 | ||
6cdfb6e6 RS |
27 | #include <stdio.h> |
28 | #include <stdlib.h> | |
29 | #include <errno.h> | |
30 | #include <io.h> | |
31 | #include <signal.h> | |
32 | ||
6cdfb6e6 RS |
33 | #include <windows.h> |
34 | ||
35 | #include "lisp.h" | |
36 | #include "nt.h" | |
37 | #include "systime.h" | |
3d7eead0 GV |
38 | #include "syswait.h" |
39 | #include "process.h" | |
40 | ||
41 | #ifndef SYS_SIGLIST_DECLARED | |
42 | extern char *sys_siglist[]; | |
43 | #endif | |
6cdfb6e6 RS |
44 | |
45 | /* #define FULL_DEBUG */ | |
46 | ||
47 | typedef void (_CALLBACK_ *signal_handler)(int); | |
48 | ||
49 | /* Defined in process.h which conflicts with the local copy */ | |
50 | #define _P_NOWAIT 1 | |
51 | ||
52 | typedef struct _child_process | |
53 | { | |
54 | int fd; | |
55 | HANDLE char_avail; | |
56 | HANDLE char_consumed; | |
57 | char chr; | |
58 | BOOL status; | |
59 | HANDLE process; | |
60 | DWORD pid; | |
61 | HANDLE thrd; | |
62 | } child_process; | |
63 | ||
64 | #define MAX_CHILDREN MAXDESC | |
65 | ||
66 | #ifdef EMACSDEBUG | |
67 | void _CRTAPI1 | |
68 | _DebPrint (char *fmt, ...) | |
69 | { | |
70 | char buf[256]; | |
71 | va_list args; | |
72 | ||
73 | va_start (args, fmt); | |
74 | vsprintf (buf, fmt, args); | |
75 | va_end (args); | |
76 | OutputDebugString (buf); | |
77 | } | |
78 | #endif | |
79 | ||
80 | /* Child process management list. */ | |
81 | static int child_proc_count = 0; | |
82 | static child_process child_procs[MAX_CHILDREN]; | |
83 | static child_process *dead_child = NULL; | |
84 | ||
85 | #define CHILD_ACTIVE(cp) ((cp)->process != NULL) | |
86 | #define DEACTIVATE_CHILD(cp) ((cp)->process = NULL) | |
87 | ||
88 | /* Signal handlers...SIG_DFL == 0 so this is initialized correctly. */ | |
89 | static signal_handler sig_handlers[NSIG]; | |
90 | ||
91 | /* Fake signal implementation to record the SIGCHLD handler. */ | |
92 | signal_handler | |
93 | win32_signal (int sig, signal_handler handler) | |
94 | { | |
95 | signal_handler old; | |
96 | ||
97 | if (sig != SIGCHLD) | |
98 | { | |
99 | errno = EINVAL; | |
100 | return SIG_ERR; | |
101 | } | |
102 | old = sig_handlers[sig]; | |
103 | sig_handlers[sig] = handler; | |
104 | return old; | |
105 | } | |
106 | ||
107 | /* Find an unused process slot. */ | |
108 | static child_process * | |
109 | new_child (void) | |
110 | { | |
111 | child_process *cp; | |
112 | ||
113 | if (child_proc_count == MAX_CHILDREN) | |
114 | return NULL; | |
115 | ||
116 | for (cp = child_procs+(child_proc_count-1); cp >= child_procs; cp--) | |
117 | if (!CHILD_ACTIVE (cp)) | |
118 | return cp; | |
119 | return &child_procs[child_proc_count++]; | |
120 | } | |
121 | ||
122 | /* Find a child by pid. */ | |
123 | static child_process * | |
124 | find_child_pid (DWORD pid) | |
125 | { | |
126 | child_process *cp; | |
127 | ||
128 | for (cp = child_procs+(child_proc_count-1); cp >= child_procs; cp--) | |
129 | if (CHILD_ACTIVE (cp) && pid == cp->pid) | |
130 | return cp; | |
131 | return NULL; | |
132 | } | |
133 | ||
134 | /* Find a child by fd. */ | |
135 | static child_process * | |
136 | find_child_fd (int fd) | |
137 | { | |
138 | child_process *cp; | |
139 | ||
140 | for (cp = child_procs+(child_proc_count-1); cp >= child_procs; cp--) | |
141 | if (CHILD_ACTIVE (cp) && fd == cp->fd) | |
142 | return cp; | |
143 | return NULL; | |
144 | } | |
145 | ||
146 | /* Thread proc for child process reader threads | |
147 | The threads just sit in a loop waiting for input | |
148 | When they detect input, they signal the char_avail input to | |
149 | wake up the select emulator | |
150 | When the select emulator processes their input, it pulses | |
151 | char_consumed so that the reader thread goes back to reading. */ | |
152 | DWORD WINAPI | |
153 | reader_thread (void *arg) | |
154 | { | |
155 | child_process *cp; | |
156 | ||
157 | /* Our identity */ | |
158 | cp = (child_process *)arg; | |
159 | ||
160 | /* We have to wait for the go-ahead before we can start */ | |
161 | if (WaitForSingleObject (cp->char_consumed, INFINITE) != WAIT_OBJECT_0) | |
162 | return 0; | |
163 | /* If something went wrong, quit */ | |
164 | if (!cp->status) | |
165 | return 0; | |
166 | ||
167 | for (;;) | |
168 | { | |
169 | /* Use read to get CRLF translation */ | |
170 | if (read (cp->fd, &cp->chr, sizeof (char)) == sizeof (char)) | |
171 | { | |
172 | cp->status = TRUE; | |
173 | } | |
174 | else | |
175 | { | |
176 | #ifdef FULL_DEBUG | |
177 | DebPrint (("reader_thread.read failed with %lu for fd %ld\n", | |
178 | GetLastError (), cp->fd)); | |
179 | #endif | |
180 | cp->status = FALSE; | |
181 | } | |
182 | ||
183 | if (!SetEvent (cp->char_avail)) | |
184 | { | |
185 | DebPrint (("reader_thread.SetEvent failed with %lu for fd %ld\n", | |
186 | GetLastError (), cp->fd)); | |
187 | break; | |
188 | } | |
189 | ||
190 | /* If the read died, the child has died so let the thread die */ | |
191 | if (!cp->status) | |
192 | break; | |
193 | ||
194 | /* Wait until our input is acknowledged before reading again */ | |
195 | if (WaitForSingleObject (cp->char_consumed, INFINITE) != WAIT_OBJECT_0) | |
196 | { | |
197 | DebPrint (("reader_thread.WaitForSingleObject failed with " | |
198 | "%lu for fd %ld\n", GetLastError (), cp->fd)); | |
199 | break; | |
200 | } | |
201 | } | |
202 | return 0; | |
203 | } | |
204 | ||
205 | static BOOL | |
206 | create_child (char *exe, char *cmdline, char *env, | |
207 | PROCESS_INFORMATION *info) | |
208 | { | |
209 | child_process *cp; | |
210 | DWORD id; | |
211 | STARTUPINFO start; | |
212 | SECURITY_ATTRIBUTES sec_attrs; | |
213 | SECURITY_DESCRIPTOR sec_desc; | |
214 | ||
215 | cp = new_child (); | |
216 | if (cp == NULL) | |
217 | goto EH_Fail; | |
218 | ||
219 | cp->fd = -1; | |
220 | ||
221 | cp->char_avail = CreateEvent (NULL, FALSE, FALSE, NULL); | |
222 | if (cp->char_avail == NULL) | |
223 | goto EH_Fail; | |
224 | ||
225 | cp->char_consumed = CreateEvent (NULL, FALSE, FALSE, NULL); | |
226 | if (cp->char_consumed == NULL) | |
227 | goto EH_char_avail; | |
228 | ||
229 | cp->thrd = CreateThread (NULL, 1024, reader_thread, cp, 0, &id); | |
230 | if (cp->thrd == NULL) | |
231 | goto EH_char_consumed; | |
232 | ||
233 | memset (&start, 0, sizeof (start)); | |
234 | start.cb = sizeof (start); | |
235 | ||
58d4e829 GV |
236 | #ifdef HAVE_NTGUI |
237 | start.dwFlags = STARTF_USESTDHANDLES | STARTF_USESHOWWINDOW; | |
238 | start.wShowWindow = SW_HIDE; | |
239 | ||
240 | start.hStdInput = GetStdHandle (STD_INPUT_HANDLE); | |
241 | start.hStdOutput = GetStdHandle (STD_OUTPUT_HANDLE); | |
242 | start.hStdError = GetStdHandle (STD_ERROR_HANDLE); | |
243 | #endif /* HAVE_NTGUI */ | |
244 | ||
6cdfb6e6 RS |
245 | /* Explicitly specify no security */ |
246 | if (!InitializeSecurityDescriptor (&sec_desc, SECURITY_DESCRIPTOR_REVISION)) | |
247 | goto EH_thrd; | |
248 | if (!SetSecurityDescriptorDacl (&sec_desc, TRUE, NULL, FALSE)) | |
249 | goto EH_thrd; | |
250 | sec_attrs.nLength = sizeof (sec_attrs); | |
251 | sec_attrs.lpSecurityDescriptor = &sec_desc; | |
252 | sec_attrs.bInheritHandle = FALSE; | |
253 | ||
254 | if (!CreateProcess (exe, cmdline, &sec_attrs, NULL, TRUE, | |
255 | CREATE_NEW_PROCESS_GROUP, env, NULL, | |
256 | &start, info)) | |
257 | goto EH_thrd; | |
258 | cp->process = info->hProcess; | |
259 | cp->pid = info->dwProcessId; | |
260 | ||
261 | return TRUE; | |
262 | ||
263 | EH_thrd: | |
264 | id = GetLastError (); | |
265 | ||
266 | cp->status = FALSE; | |
267 | SetEvent (cp->char_consumed); | |
268 | EH_char_consumed: | |
269 | CloseHandle (cp->char_consumed); | |
270 | EH_char_avail: | |
271 | CloseHandle (cp->char_avail); | |
272 | EH_Fail: | |
273 | return FALSE; | |
274 | } | |
275 | ||
276 | /* create_child doesn't know what emacs' file handle will be for waiting | |
277 | on output from the child, so we need to make this additional call | |
278 | to register the handle with the process | |
279 | This way the select emulator knows how to match file handles with | |
280 | entries in child_procs. */ | |
281 | void | |
282 | register_child (int pid, int fd) | |
283 | { | |
284 | child_process *cp; | |
285 | ||
286 | cp = find_child_pid (pid); | |
287 | if (cp == NULL) | |
288 | { | |
289 | DebPrint (("register_child unable to find pid %lu\n", pid)); | |
290 | return; | |
291 | } | |
292 | ||
293 | #ifdef FULL_DEBUG | |
294 | DebPrint (("register_child registered fd %d with pid %lu\n", fd, pid)); | |
295 | #endif | |
296 | ||
297 | cp->fd = fd; | |
298 | cp->status = TRUE; | |
299 | ||
300 | /* Tell the reader thread to start */ | |
301 | if (!SetEvent (cp->char_consumed)) | |
302 | { | |
303 | DebPrint (("register_child.SetEvent failed with %lu for fd %ld\n", | |
304 | GetLastError (), cp->fd)); | |
305 | } | |
306 | } | |
307 | ||
308 | /* When a process dies its pipe will break so the reader thread will | |
309 | signal failure to the select emulator. | |
310 | The select emulator then calls this routine to clean up. | |
311 | Since the thread signaled failure we can assume it is exiting. */ | |
312 | static void | |
313 | remove_child (child_process *cp) | |
314 | { | |
315 | /* Reap the thread */ | |
316 | if (WaitForSingleObject (cp->thrd, INFINITE) != WAIT_OBJECT_0) | |
317 | { | |
318 | DebPrint (("remove_child.WaitForSingleObject (thread) failed " | |
319 | "with %lu for fd %ld\n", GetLastError (), cp->fd)); | |
320 | } | |
321 | CloseHandle (cp->thrd); | |
322 | CloseHandle (cp->char_consumed); | |
323 | CloseHandle (cp->char_avail); | |
324 | ||
325 | /* Reap the process */ | |
326 | if (WaitForSingleObject (cp->process, INFINITE) != WAIT_OBJECT_0) | |
327 | { | |
328 | DebPrint (("remove_child.WaitForSingleObject (process) failed " | |
329 | "with %lu for fd %ld\n", GetLastError (), cp->fd)); | |
330 | } | |
331 | CloseHandle (cp->process); | |
332 | ||
333 | DEACTIVATE_CHILD (cp); | |
334 | } | |
335 | ||
336 | /* Wait for any of our existing child processes to die | |
337 | When it does, close its handle | |
338 | Return the pid and fill in the status if non-NULL. */ | |
22759c72 | 339 | |
6cdfb6e6 RS |
340 | int |
341 | win32_wait (int *status) | |
342 | { | |
343 | DWORD active, retval; | |
344 | int nh; | |
345 | child_process *cp, *cps[MAX_CHILDREN]; | |
346 | HANDLE wait_hnd[MAX_CHILDREN]; | |
347 | ||
348 | nh = 0; | |
349 | if (dead_child != NULL) | |
350 | { | |
351 | /* We want to wait for a specific child */ | |
352 | wait_hnd[nh] = dead_child->process; | |
353 | cps[nh] = dead_child; | |
354 | nh++; | |
355 | } | |
356 | else | |
357 | { | |
358 | for (cp = child_procs+(child_proc_count-1); cp >= child_procs; cp--) | |
359 | if (CHILD_ACTIVE (cp)) | |
360 | { | |
361 | wait_hnd[nh] = cp->process; | |
362 | cps[nh] = cp; | |
363 | nh++; | |
364 | } | |
365 | } | |
366 | ||
367 | if (nh == 0) | |
368 | { | |
369 | /* Nothing to wait on, so fail */ | |
370 | errno = ECHILD; | |
371 | return -1; | |
372 | } | |
373 | ||
374 | active = WaitForMultipleObjects (nh, wait_hnd, FALSE, INFINITE); | |
375 | if (active == WAIT_FAILED) | |
376 | { | |
377 | errno = EBADF; | |
378 | return -1; | |
379 | } | |
380 | else if (active == WAIT_TIMEOUT) | |
381 | { | |
382 | /* Should never happen */ | |
383 | errno = EINVAL; | |
384 | return -1; | |
385 | } | |
386 | else if (active >= WAIT_OBJECT_0 && | |
387 | active < WAIT_OBJECT_0+MAXIMUM_WAIT_OBJECTS) | |
388 | { | |
389 | active -= WAIT_OBJECT_0; | |
390 | } | |
391 | else if (active >= WAIT_ABANDONED_0 && | |
392 | active < WAIT_ABANDONED_0+MAXIMUM_WAIT_OBJECTS) | |
393 | { | |
394 | active -= WAIT_ABANDONED_0; | |
395 | } | |
396 | ||
397 | if (!GetExitCodeProcess (wait_hnd[active], &retval)) | |
398 | { | |
399 | DebPrint (("Wait.GetExitCodeProcess failed with %lu\n", | |
400 | GetLastError ())); | |
401 | retval = 1; | |
402 | } | |
403 | if (retval == STILL_ACTIVE) | |
404 | { | |
405 | /* Should never happen */ | |
406 | DebPrint (("Wait.WaitForMultipleObjects returned an active process\n")); | |
407 | errno = EINVAL; | |
408 | return -1; | |
409 | } | |
bc69349b RS |
410 | |
411 | /* Massage the exit code from the process to match the format expected | |
8e6208c5 | 412 | by the WIFSTOPPED et al macros in syswait.h. Only WIFSIGNALED and |
bc69349b RS |
413 | WIFEXITED are supported; WIFSTOPPED doesn't make sense under NT. */ |
414 | ||
415 | if (retval == STATUS_CONTROL_C_EXIT) | |
416 | retval = SIGINT; | |
417 | else | |
418 | retval <<= 8; | |
419 | ||
6cdfb6e6 | 420 | cp = cps[active]; |
22759c72 | 421 | |
6cdfb6e6 RS |
422 | if (status) |
423 | { | |
22759c72 KH |
424 | *status = retval; |
425 | } | |
426 | else if (synch_process_alive) | |
427 | { | |
428 | synch_process_alive = 0; | |
22759c72 | 429 | |
3d7eead0 GV |
430 | /* Report the status of the synchronous process. */ |
431 | if (WIFEXITED (retval)) | |
432 | synch_process_retcode = WRETCODE (retval); | |
433 | else if (WIFSIGNALED (retval)) | |
434 | { | |
435 | int code = WTERMSIG (retval); | |
436 | char *signame = 0; | |
437 | ||
438 | if (code < NSIG) | |
439 | { | |
440 | /* Suppress warning if the table has const char *. */ | |
441 | signame = (char *) sys_siglist[code]; | |
442 | } | |
443 | if (signame == 0) | |
444 | signame = "unknown"; | |
445 | ||
446 | synch_process_death = signame; | |
447 | } | |
22759c72 KH |
448 | TerminateThread (cp->thrd, 0); |
449 | CloseHandle (cp->thrd); | |
450 | CloseHandle (cp->char_consumed); | |
451 | CloseHandle (cp->char_avail); | |
452 | CloseHandle (cp->process); | |
453 | DEACTIVATE_CHILD (cp); | |
6cdfb6e6 RS |
454 | } |
455 | ||
456 | return cp->pid; | |
457 | } | |
458 | ||
459 | /* We pass our process ID to our children by setting up an environment | |
460 | variable in their environment. */ | |
461 | char ppid_env_var_buffer[64]; | |
462 | ||
463 | /* When a new child process is created we need to register it in our list, | |
464 | so intercept spawn requests. */ | |
465 | int | |
466 | win32_spawnve (int mode, char *cmdname, char **argv, char **envp) | |
467 | { | |
0a4de642 | 468 | Lisp_Object program, full; |
6cdfb6e6 RS |
469 | char *cmdline, *env, *parg, **targ; |
470 | int arglen; | |
471 | PROCESS_INFORMATION pi; | |
0a4de642 RS |
472 | |
473 | /* Handle executable names without an executable suffix. */ | |
474 | program = make_string (cmdname, strlen (cmdname)); | |
475 | if (NILP (Ffile_executable_p (program))) | |
476 | { | |
477 | struct gcpro gcpro1; | |
478 | ||
479 | full = Qnil; | |
480 | GCPRO1 (program); | |
481 | openp (Vexec_path, program, EXEC_SUFFIXES, &full, 1); | |
482 | UNGCPRO; | |
483 | if (NILP (full)) | |
484 | { | |
485 | errno = EINVAL; | |
486 | return -1; | |
487 | } | |
488 | cmdname = XSTRING (full)->data; | |
489 | argv[0] = cmdname; | |
490 | } | |
491 | ||
6cdfb6e6 RS |
492 | if (child_proc_count == MAX_CHILDREN) |
493 | { | |
494 | errno = EAGAIN; | |
495 | return -1; | |
496 | } | |
497 | ||
498 | /* We don't care about the other modes */ | |
499 | if (mode != _P_NOWAIT) | |
500 | { | |
501 | errno = EINVAL; | |
502 | return -1; | |
503 | } | |
504 | ||
505 | /* we have to do some conjuring here to put argv and envp into the | |
506 | form CreateProcess wants... argv needs to be a space separated/null | |
507 | terminated list of parameters, and envp is a null | |
508 | separated/double-null terminated list of parameters. | |
509 | ||
510 | Since I have no idea how large argv and envp are likely to be | |
511 | we figure out list lengths on the fly and allocate them. */ | |
512 | ||
513 | /* do argv... */ | |
514 | arglen = 0; | |
515 | targ = argv; | |
516 | while (*targ) | |
517 | { | |
518 | arglen += strlen (*targ++) + 1; | |
519 | } | |
520 | cmdline = malloc (arglen); | |
521 | if (cmdline == NULL) | |
522 | { | |
523 | errno = ENOMEM; | |
524 | goto EH_Fail; | |
525 | } | |
526 | targ = argv; | |
527 | parg = cmdline; | |
528 | while (*targ) | |
529 | { | |
530 | strcpy (parg, *targ); | |
531 | parg += strlen (*targ++); | |
532 | *parg++ = ' '; | |
533 | } | |
534 | *--parg = '\0'; | |
535 | ||
536 | /* and envp... */ | |
537 | arglen = 1; | |
538 | targ = envp; | |
539 | while (*targ) | |
540 | { | |
541 | arglen += strlen (*targ++) + 1; | |
542 | } | |
543 | sprintf (ppid_env_var_buffer, "__PARENT_PROCESS_ID=%d", | |
544 | GetCurrentProcessId ()); | |
545 | arglen += strlen (ppid_env_var_buffer) + 1; | |
546 | ||
547 | env = malloc (arglen); | |
548 | if (env == NULL) | |
549 | { | |
550 | errno = ENOMEM; | |
551 | goto EH_cmdline; | |
552 | } | |
553 | targ = envp; | |
554 | parg = env; | |
555 | while (*targ) | |
556 | { | |
557 | strcpy (parg, *targ); | |
558 | parg += strlen (*targ++); | |
559 | *parg++ = '\0'; | |
560 | } | |
561 | strcpy (parg, ppid_env_var_buffer); | |
562 | parg += strlen (ppid_env_var_buffer); | |
563 | *parg++ = '\0'; | |
564 | *parg = '\0'; | |
565 | ||
566 | /* Now create the process. */ | |
567 | if (!create_child (cmdname, cmdline, env, &pi)) | |
568 | { | |
569 | errno = ENOEXEC; | |
570 | goto EH_env; | |
571 | } | |
572 | ||
573 | return pi.dwProcessId; | |
574 | ||
575 | EH_env: | |
576 | free (env); | |
577 | EH_cmdline: | |
578 | free (cmdline); | |
579 | EH_Fail: | |
580 | return -1; | |
581 | } | |
582 | ||
583 | /* Emulate the select call | |
584 | Wait for available input on any of the given rfds, or timeout if | |
585 | a timeout is given and no input is detected | |
586 | wfds and efds are not supported and must be NULL. */ | |
587 | ||
588 | /* From ntterm.c */ | |
589 | extern HANDLE keyboard_handle; | |
590 | /* From process.c */ | |
591 | extern int proc_buffered_char[]; | |
592 | ||
593 | int | |
22759c72 KH |
594 | sys_select (int nfds, SELECT_TYPE *rfds, SELECT_TYPE *wfds, SELECT_TYPE *efds, |
595 | EMACS_TIME *timeout) | |
6cdfb6e6 RS |
596 | { |
597 | SELECT_TYPE orfds; | |
598 | DWORD timeout_ms; | |
599 | int i, nh, nr; | |
600 | DWORD active; | |
58d4e829 GV |
601 | child_process *cp, *cps[MAX_CHILDREN + 1]; |
602 | HANDLE wait_hnd[MAX_CHILDREN + 1]; | |
603 | #ifdef HAVE_NTGUI1 | |
604 | BOOL keyboardwait = FALSE ; | |
605 | #endif /* HAVE_NTGUI */ | |
6cdfb6e6 RS |
606 | |
607 | /* If the descriptor sets are NULL but timeout isn't, then just Sleep. */ | |
608 | if (rfds == NULL && wfds == NULL && efds == NULL && timeout != NULL) | |
609 | { | |
22759c72 KH |
610 | #ifdef HAVE_TIMEVAL |
611 | Sleep (timeout->tv_sec * 1000 + timeout->tv_usec / 1000); | |
612 | #else | |
6cdfb6e6 | 613 | Sleep ((*timeout) * 1000); |
22759c72 | 614 | #endif |
6cdfb6e6 RS |
615 | return 0; |
616 | } | |
617 | ||
618 | /* Otherwise, we only handle rfds, so fail otherwise. */ | |
619 | if (rfds == NULL || wfds != NULL || efds != NULL) | |
620 | { | |
621 | errno = EINVAL; | |
622 | return -1; | |
623 | } | |
624 | ||
625 | orfds = *rfds; | |
626 | FD_ZERO (rfds); | |
627 | nr = 0; | |
628 | ||
629 | /* Build a list of handles to wait on. */ | |
630 | nh = 0; | |
631 | for (i = 0; i < nfds; i++) | |
632 | if (FD_ISSET (i, &orfds)) | |
633 | { | |
634 | if (i == 0) | |
635 | { | |
58d4e829 GV |
636 | #ifdef HAVE_NTGUI1 |
637 | keyboardwait = TRUE ; | |
638 | #else | |
6cdfb6e6 RS |
639 | /* Handle stdin specially */ |
640 | wait_hnd[nh] = keyboard_handle; | |
641 | cps[nh] = NULL; | |
642 | nh++; | |
58d4e829 | 643 | #endif /* HAVE_NTGUI */ |
6cdfb6e6 RS |
644 | |
645 | /* Check for any emacs-generated input in the queue since | |
646 | it won't be detected in the wait */ | |
647 | if (detect_input_pending ()) | |
648 | { | |
649 | FD_SET (i, rfds); | |
650 | nr++; | |
651 | } | |
652 | } | |
653 | else | |
654 | { | |
655 | /* Child process input */ | |
656 | cp = find_child_fd (i); | |
657 | if (cp) | |
658 | { | |
659 | #ifdef FULL_DEBUG | |
660 | DebPrint (("select waiting on child %d fd %d\n", | |
661 | cp-child_procs, i)); | |
662 | #endif | |
663 | wait_hnd[nh] = cp->char_avail; | |
664 | cps[nh] = cp; | |
665 | nh++; | |
666 | } | |
667 | else | |
668 | { | |
669 | /* Unable to find something to wait on for this fd, fail */ | |
670 | DebPrint (("select unable to find child process " | |
671 | "for fd %ld\n", i)); | |
672 | nh = 0; | |
673 | break; | |
674 | } | |
675 | } | |
676 | } | |
677 | ||
58d4e829 GV |
678 | /* Never do this in win32 since we will not get paint messages */ |
679 | ||
680 | #ifndef HAVE_NTGUI1 | |
6cdfb6e6 RS |
681 | /* Nothing to look for, so we didn't find anything */ |
682 | if (nh == 0) | |
683 | { | |
22759c72 KH |
684 | if (timeout) |
685 | #ifdef HAVE_TIMEVAL | |
686 | Sleep (timeout->tv_sec * 1000 + timeout->tv_usec / 1000); | |
687 | #else | |
688 | Sleep ((*timeout) * 1000); | |
689 | #endif | |
6cdfb6e6 RS |
690 | return 0; |
691 | } | |
58d4e829 | 692 | #endif /* !HAVE_NTGUI */ |
6cdfb6e6 RS |
693 | |
694 | /* Check for immediate return without waiting */ | |
695 | if (nr > 0) | |
696 | return nr; | |
697 | ||
698 | /* | |
699 | Wait for input | |
700 | If a child process dies while this is waiting, its pipe will break | |
701 | so the reader thread will signal an error condition, thus, the wait | |
702 | will wake up | |
703 | */ | |
22759c72 KH |
704 | #ifdef HAVE_TIMEVAL |
705 | timeout_ms = timeout ? (timeout->tv_sec * 1000 + timeout->tv_usec / 1000) : INFINITE; | |
706 | #else | |
6cdfb6e6 | 707 | timeout_ms = timeout ? *timeout*1000 : INFINITE; |
22759c72 | 708 | #endif |
58d4e829 GV |
709 | #ifdef HAVE_NTGUI1 |
710 | active = MsgWaitForMultipleObjects (nh, wait_hnd, FALSE, timeout_ms,QS_ALLINPUT); | |
711 | #else | |
6cdfb6e6 | 712 | active = WaitForMultipleObjects (nh, wait_hnd, FALSE, timeout_ms); |
58d4e829 | 713 | #endif /* HAVE_NTGUI */ |
6cdfb6e6 RS |
714 | if (active == WAIT_FAILED) |
715 | { | |
716 | DebPrint (("select.WaitForMultipleObjects (%d, %lu) failed with %lu\n", | |
717 | nh, timeout_ms, GetLastError ())); | |
718 | /* Is there a better error? */ | |
719 | errno = EBADF; | |
720 | return -1; | |
721 | } | |
722 | else if (active == WAIT_TIMEOUT) | |
723 | { | |
724 | return 0; | |
725 | } | |
58d4e829 GV |
726 | #ifdef HAVE_NTGUI1 |
727 | else if (active == WAIT_OBJECT_0 + nh) | |
728 | { | |
729 | /* Keyboard input available */ | |
730 | FD_SET (0, rfds); | |
731 | ||
732 | /* This shouldn't be necessary, but apparently just setting the input | |
733 | fd is not good enough for emacs */ | |
734 | // read_input_waiting (); | |
735 | ||
736 | return (1) ; | |
737 | } | |
738 | #endif /* HAVE_NTGUI */ | |
6cdfb6e6 RS |
739 | else if (active >= WAIT_OBJECT_0 && |
740 | active < WAIT_OBJECT_0+MAXIMUM_WAIT_OBJECTS) | |
741 | { | |
742 | active -= WAIT_OBJECT_0; | |
743 | } | |
744 | else if (active >= WAIT_ABANDONED_0 && | |
745 | active < WAIT_ABANDONED_0+MAXIMUM_WAIT_OBJECTS) | |
746 | { | |
747 | active -= WAIT_ABANDONED_0; | |
748 | } | |
749 | ||
750 | if (cps[active] == NULL) | |
751 | { | |
752 | /* Keyboard input available */ | |
753 | FD_SET (0, rfds); | |
754 | nr++; | |
755 | ||
756 | /* This shouldn't be necessary, but apparently just setting the input | |
757 | fd is not good enough for emacs */ | |
758 | read_input_waiting (); | |
759 | } | |
760 | else | |
761 | { | |
762 | /* Child process */ | |
763 | cp = cps[active]; | |
764 | ||
765 | /* If status is FALSE the read failed so don't report input */ | |
766 | if (cp->status) | |
767 | { | |
768 | FD_SET (cp->fd, rfds); | |
769 | proc_buffered_char[cp->fd] = cp->chr; | |
770 | nr++; | |
771 | } | |
772 | else | |
773 | { | |
774 | /* The SIGCHLD handler will do a Wait so we know it won't | |
775 | return until the process is dead | |
776 | We force Wait to only wait for this process to avoid it | |
777 | picking up other children that happen to be dead but that | |
778 | we haven't noticed yet | |
779 | SIG_DFL for SIGCHLD is ignore? */ | |
780 | if (sig_handlers[SIGCHLD] != SIG_DFL && | |
781 | sig_handlers[SIGCHLD] != SIG_IGN) | |
782 | { | |
783 | #ifdef FULL_DEBUG | |
784 | DebPrint (("select calling SIGCHLD handler for pid %d\n", | |
785 | cp->pid)); | |
786 | #endif | |
787 | dead_child = cp; | |
788 | sig_handlers[SIGCHLD](SIGCHLD); | |
789 | dead_child = NULL; | |
790 | } | |
791 | ||
792 | /* Clean up the child process entry in the table */ | |
793 | remove_child (cp); | |
794 | } | |
795 | } | |
796 | return nr; | |
797 | } | |
798 | ||
799 | /* | |
800 | Substitute for certain kill () operations | |
801 | */ | |
802 | int | |
803 | win32_kill_process (int pid, int sig) | |
804 | { | |
805 | child_process *cp; | |
806 | ||
807 | /* Only handle signals that will result in the process dying */ | |
808 | if (sig != SIGINT && sig != SIGKILL && sig != SIGQUIT && sig != SIGHUP) | |
809 | { | |
810 | errno = EINVAL; | |
811 | return -1; | |
812 | } | |
813 | ||
814 | cp = find_child_pid (pid); | |
815 | if (cp == NULL) | |
816 | { | |
817 | DebPrint (("win32_kill_process didn't find a child with pid %lu\n", pid)); | |
818 | errno = ECHILD; | |
819 | return -1; | |
820 | } | |
821 | ||
822 | if (sig == SIGINT) | |
823 | { | |
824 | /* Fake Ctrl-Break. */ | |
825 | if (!GenerateConsoleCtrlEvent (CTRL_BREAK_EVENT, pid)) | |
826 | { | |
827 | DebPrint (("win32_kill_process.GenerateConsoleCtrlEvent return %d " | |
828 | "for pid %lu\n", GetLastError (), pid)); | |
829 | errno = EINVAL; | |
830 | return -1; | |
831 | } | |
832 | } | |
833 | else | |
834 | { | |
835 | /* Kill the process. On Win32 this doesn't kill child processes | |
836 | so it doesn't work very well for shells which is why it's | |
837 | not used in every case. */ | |
838 | if (!TerminateProcess (cp->process, 0xff)) | |
839 | { | |
840 | DebPrint (("win32_kill_process.TerminateProcess returned %d " | |
841 | "for pid %lu\n", GetLastError (), pid)); | |
842 | errno = EINVAL; | |
843 | return -1; | |
844 | } | |
845 | } | |
846 | return 0; | |
847 | } | |
848 | ||
849 | /* If the channel is a pipe this read might block since we don't | |
850 | know how many characters are available, so check and read only | |
851 | what's there | |
852 | We also need to wake up the reader thread once we've read our data. */ | |
853 | int | |
854 | read_child_output (int fd, char *buf, int max) | |
855 | { | |
856 | HANDLE h; | |
857 | int to_read, nchars; | |
858 | DWORD waiting; | |
859 | child_process *cp; | |
860 | ||
861 | h = (HANDLE)_get_osfhandle (fd); | |
862 | if (GetFileType (h) == FILE_TYPE_PIPE) | |
863 | { | |
864 | PeekNamedPipe (h, NULL, 0, NULL, &waiting, NULL); | |
865 | to_read = min (waiting, (DWORD)max); | |
866 | } | |
867 | else | |
868 | to_read = max; | |
869 | ||
870 | /* Use read to get CRLF translation */ | |
871 | nchars = read (fd, buf, to_read); | |
872 | ||
873 | if (GetFileType (h) == FILE_TYPE_PIPE) | |
874 | { | |
875 | /* Wake up the reader thread | |
876 | for this process */ | |
877 | cp = find_child_fd (fd); | |
878 | if (cp) | |
879 | { | |
880 | if (!SetEvent (cp->char_consumed)) | |
881 | DebPrint (("read_child_output.SetEvent failed with " | |
882 | "%lu for fd %ld\n", GetLastError (), fd)); | |
883 | } | |
884 | else | |
885 | DebPrint (("read_child_output couldn't find a child with fd %d\n", | |
886 | fd)); | |
887 | } | |
888 | ||
889 | return nchars; | |
890 | } |