Commit | Line | Data |
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5a17353c DD |
1 | /* Utilities to execute a program in a subprocess (possibly linked by pipes |
2 | with other subprocesses), and wait for it. Generic Unix version | |
3 | (also used for UWIN and VMS). | |
59e11e17 DD |
4 | Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2004, 2005, 2009, |
5 | 2010 Free Software Foundation, Inc. | |
5a17353c DD |
6 | |
7 | This file is part of the libiberty library. | |
8 | Libiberty is free software; you can redistribute it and/or | |
9 | modify it under the terms of the GNU Library General Public | |
10 | License as published by the Free Software Foundation; either | |
11 | version 2 of the License, or (at your option) any later version. | |
12 | ||
13 | Libiberty is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Library General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Library General Public | |
19 | License along with libiberty; see the file COPYING.LIB. If not, | |
979c05d3 NC |
20 | write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor, |
21 | Boston, MA 02110-1301, USA. */ | |
5a17353c | 22 | |
b109e79a ILT |
23 | #include "config.h" |
24 | #include "libiberty.h" | |
5a17353c DD |
25 | #include "pex-common.h" |
26 | ||
27 | #include <stdio.h> | |
b109e79a | 28 | #include <signal.h> |
5a17353c DD |
29 | #include <errno.h> |
30 | #ifdef NEED_DECLARATION_ERRNO | |
31 | extern int errno; | |
32 | #endif | |
b109e79a ILT |
33 | #ifdef HAVE_STDLIB_H |
34 | #include <stdlib.h> | |
35 | #endif | |
5a17353c DD |
36 | #ifdef HAVE_STRING_H |
37 | #include <string.h> | |
38 | #endif | |
39 | #ifdef HAVE_UNISTD_H | |
40 | #include <unistd.h> | |
41 | #endif | |
b109e79a ILT |
42 | |
43 | #include <sys/types.h> | |
44 | ||
45 | #ifdef HAVE_FCNTL_H | |
46 | #include <fcntl.h> | |
5a17353c DD |
47 | #endif |
48 | #ifdef HAVE_SYS_WAIT_H | |
49 | #include <sys/wait.h> | |
50 | #endif | |
b109e79a ILT |
51 | #ifdef HAVE_GETRUSAGE |
52 | #include <sys/time.h> | |
53 | #include <sys/resource.h> | |
54 | #endif | |
55 | #ifdef HAVE_SYS_STAT_H | |
56 | #include <sys/stat.h> | |
5a17353c | 57 | #endif |
9c55e064 RH |
58 | #ifdef HAVE_PROCESS_H |
59 | #include <process.h> | |
60 | #endif | |
b109e79a | 61 | |
12a7367e DD |
62 | #ifdef vfork /* Autoconf may define this to fork for us. */ |
63 | # define VFORK_STRING "fork" | |
64 | #else | |
65 | # define VFORK_STRING "vfork" | |
66 | #endif | |
67 | #ifdef HAVE_VFORK_H | |
68 | #include <vfork.h> | |
69 | #endif | |
9fef968a DD |
70 | #if defined(VMS) && defined (__LONG_POINTERS) |
71 | #ifndef __CHAR_PTR32 | |
72 | typedef char * __char_ptr32 | |
73 | __attribute__ ((mode (SI))); | |
74 | #endif | |
75 | ||
76 | typedef __char_ptr32 *__char_ptr_char_ptr32 | |
77 | __attribute__ ((mode (SI))); | |
78 | ||
79 | /* Return a 32 bit pointer to an array of 32 bit pointers | |
80 | given a 64 bit pointer to an array of 64 bit pointers. */ | |
81 | ||
82 | static __char_ptr_char_ptr32 | |
83 | to_ptr32 (char **ptr64) | |
84 | { | |
85 | int argc; | |
86 | __char_ptr_char_ptr32 short_argv; | |
87 | ||
88 | for (argc=0; ptr64[argc]; argc++); | |
12a7367e | 89 | |
9fef968a DD |
90 | /* Reallocate argv with 32 bit pointers. */ |
91 | short_argv = (__char_ptr_char_ptr32) decc$malloc | |
92 | (sizeof (__char_ptr32) * (argc + 1)); | |
93 | ||
94 | for (argc=0; ptr64[argc]; argc++) | |
95 | short_argv[argc] = (__char_ptr32) decc$strdup (ptr64[argc]); | |
96 | ||
97 | short_argv[argc] = (__char_ptr32) 0; | |
98 | return short_argv; | |
99 | ||
100 | } | |
101 | #else | |
102 | #define to_ptr32(argv) argv | |
103 | #endif | |
5a17353c | 104 | |
b109e79a ILT |
105 | /* File mode to use for private and world-readable files. */ |
106 | ||
107 | #if defined (S_IRUSR) && defined (S_IWUSR) && defined (S_IRGRP) && defined (S_IWGRP) && defined (S_IROTH) && defined (S_IWOTH) | |
108 | #define PUBLIC_MODE \ | |
109 | (S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH) | |
110 | #else | |
111 | #define PUBLIC_MODE 0666 | |
112 | #endif | |
113 | ||
114 | /* Get the exit status of a particular process, and optionally get the | |
115 | time that it took. This is simple if we have wait4, slightly | |
116 | harder if we have waitpid, and is a pain if we only have wait. */ | |
117 | ||
118 | static pid_t pex_wait (struct pex_obj *, pid_t, int *, struct pex_time *); | |
119 | ||
120 | #ifdef HAVE_WAIT4 | |
121 | ||
122 | static pid_t | |
123 | pex_wait (struct pex_obj *obj ATTRIBUTE_UNUSED, pid_t pid, int *status, | |
124 | struct pex_time *time) | |
125 | { | |
126 | pid_t ret; | |
127 | struct rusage r; | |
128 | ||
129 | #ifdef HAVE_WAITPID | |
130 | if (time == NULL) | |
131 | return waitpid (pid, status, 0); | |
132 | #endif | |
133 | ||
134 | ret = wait4 (pid, status, 0, &r); | |
135 | ||
136 | if (time != NULL) | |
137 | { | |
138 | time->user_seconds = r.ru_utime.tv_sec; | |
139 | time->user_microseconds= r.ru_utime.tv_usec; | |
140 | time->system_seconds = r.ru_stime.tv_sec; | |
141 | time->system_microseconds= r.ru_stime.tv_usec; | |
142 | } | |
143 | ||
144 | return ret; | |
145 | } | |
146 | ||
147 | #else /* ! defined (HAVE_WAIT4) */ | |
148 | ||
149 | #ifdef HAVE_WAITPID | |
150 | ||
151 | #ifndef HAVE_GETRUSAGE | |
152 | ||
153 | static pid_t | |
154 | pex_wait (struct pex_obj *obj ATTRIBUTE_UNUSED, pid_t pid, int *status, | |
155 | struct pex_time *time) | |
156 | { | |
157 | if (time != NULL) | |
158 | memset (time, 0, sizeof (struct pex_time)); | |
159 | return waitpid (pid, status, 0); | |
160 | } | |
161 | ||
162 | #else /* defined (HAVE_GETRUSAGE) */ | |
163 | ||
164 | static pid_t | |
165 | pex_wait (struct pex_obj *obj ATTRIBUTE_UNUSED, pid_t pid, int *status, | |
166 | struct pex_time *time) | |
167 | { | |
168 | struct rusage r1, r2; | |
169 | pid_t ret; | |
170 | ||
171 | if (time == NULL) | |
172 | return waitpid (pid, status, 0); | |
173 | ||
174 | getrusage (RUSAGE_CHILDREN, &r1); | |
175 | ||
176 | ret = waitpid (pid, status, 0); | |
177 | if (ret < 0) | |
178 | return ret; | |
179 | ||
180 | getrusage (RUSAGE_CHILDREN, &r2); | |
181 | ||
182 | time->user_seconds = r2.ru_utime.tv_sec - r1.ru_utime.tv_sec; | |
183 | time->user_microseconds = r2.ru_utime.tv_usec - r1.ru_utime.tv_usec; | |
184 | if (r2.ru_utime.tv_usec < r1.ru_utime.tv_usec) | |
185 | { | |
186 | --time->user_seconds; | |
187 | time->user_microseconds += 1000000; | |
188 | } | |
189 | ||
190 | time->system_seconds = r2.ru_stime.tv_sec - r1.ru_stime.tv_sec; | |
191 | time->system_microseconds = r2.ru_stime.tv_usec - r1.ru_stime.tv_usec; | |
192 | if (r2.ru_stime.tv_usec < r1.ru_stime.tv_usec) | |
193 | { | |
194 | --time->system_seconds; | |
195 | time->system_microseconds += 1000000; | |
196 | } | |
12a7367e | 197 | |
b109e79a ILT |
198 | return ret; |
199 | } | |
5a17353c | 200 | |
b109e79a | 201 | #endif /* defined (HAVE_GETRUSAGE) */ |
5a17353c | 202 | |
b109e79a ILT |
203 | #else /* ! defined (HAVE_WAITPID) */ |
204 | ||
205 | struct status_list | |
206 | { | |
207 | struct status_list *next; | |
208 | pid_t pid; | |
209 | int status; | |
210 | struct pex_time time; | |
211 | }; | |
212 | ||
213 | static pid_t | |
214 | pex_wait (struct pex_obj *obj, pid_t pid, int *status, struct pex_time *time) | |
215 | { | |
216 | struct status_list **pp; | |
217 | ||
218 | for (pp = (struct status_list **) &obj->sysdep; | |
219 | *pp != NULL; | |
220 | pp = &(*pp)->next) | |
5a17353c | 221 | { |
b109e79a | 222 | if ((*pp)->pid == pid) |
5a17353c | 223 | { |
b109e79a ILT |
224 | struct status_list *p; |
225 | ||
226 | p = *pp; | |
227 | *status = p->status; | |
228 | if (time != NULL) | |
229 | *time = p->time; | |
230 | *pp = p->next; | |
231 | free (p); | |
232 | return pid; | |
5a17353c | 233 | } |
5a17353c | 234 | } |
b109e79a ILT |
235 | |
236 | while (1) | |
5a17353c | 237 | { |
b109e79a ILT |
238 | pid_t cpid; |
239 | struct status_list *psl; | |
240 | struct pex_time pt; | |
241 | #ifdef HAVE_GETRUSAGE | |
242 | struct rusage r1, r2; | |
243 | #endif | |
244 | ||
245 | if (time != NULL) | |
246 | { | |
247 | #ifdef HAVE_GETRUSAGE | |
248 | getrusage (RUSAGE_CHILDREN, &r1); | |
249 | #else | |
250 | memset (&pt, 0, sizeof (struct pex_time)); | |
251 | #endif | |
252 | } | |
253 | ||
254 | cpid = wait (status); | |
255 | ||
256 | #ifdef HAVE_GETRUSAGE | |
257 | if (time != NULL && cpid >= 0) | |
258 | { | |
259 | getrusage (RUSAGE_CHILDREN, &r2); | |
260 | ||
261 | pt.user_seconds = r2.ru_utime.tv_sec - r1.ru_utime.tv_sec; | |
262 | pt.user_microseconds = r2.ru_utime.tv_usec - r1.ru_utime.tv_usec; | |
263 | if (pt.user_microseconds < 0) | |
264 | { | |
265 | --pt.user_seconds; | |
266 | pt.user_microseconds += 1000000; | |
267 | } | |
268 | ||
269 | pt.system_seconds = r2.ru_stime.tv_sec - r1.ru_stime.tv_sec; | |
270 | pt.system_microseconds = r2.ru_stime.tv_usec - r1.ru_stime.tv_usec; | |
271 | if (pt.system_microseconds < 0) | |
272 | { | |
273 | --pt.system_seconds; | |
274 | pt.system_microseconds += 1000000; | |
275 | } | |
276 | } | |
277 | #endif | |
278 | ||
279 | if (cpid < 0 || cpid == pid) | |
280 | { | |
281 | if (time != NULL) | |
282 | *time = pt; | |
283 | return cpid; | |
284 | } | |
285 | ||
abf6a75b | 286 | psl = XNEW (struct status_list); |
b109e79a ILT |
287 | psl->pid = cpid; |
288 | psl->status = *status; | |
289 | if (time != NULL) | |
290 | psl->time = pt; | |
291 | psl->next = (struct status_list *) obj->sysdep; | |
292 | obj->sysdep = (void *) psl; | |
5a17353c | 293 | } |
b109e79a ILT |
294 | } |
295 | ||
296 | #endif /* ! defined (HAVE_WAITPID) */ | |
297 | #endif /* ! defined (HAVE_WAIT4) */ | |
298 | ||
299 | static void pex_child_error (struct pex_obj *, const char *, const char *, int) | |
300 | ATTRIBUTE_NORETURN; | |
301 | static int pex_unix_open_read (struct pex_obj *, const char *, int); | |
302 | static int pex_unix_open_write (struct pex_obj *, const char *, int); | |
29d89e07 | 303 | static pid_t pex_unix_exec_child (struct pex_obj *, int, const char *, |
014a8caf | 304 | char * const *, char * const *, |
cb6c09ac DD |
305 | int, int, int, int, |
306 | const char **, int *); | |
b109e79a | 307 | static int pex_unix_close (struct pex_obj *, int); |
29d89e07 | 308 | static int pex_unix_wait (struct pex_obj *, pid_t, int *, struct pex_time *, |
b109e79a ILT |
309 | int, const char **, int *); |
310 | static int pex_unix_pipe (struct pex_obj *, int *, int); | |
311 | static FILE *pex_unix_fdopenr (struct pex_obj *, int, int); | |
3db2e6dd | 312 | static FILE *pex_unix_fdopenw (struct pex_obj *, int, int); |
b109e79a ILT |
313 | static void pex_unix_cleanup (struct pex_obj *); |
314 | ||
315 | /* The list of functions we pass to the common routines. */ | |
316 | ||
317 | const struct pex_funcs funcs = | |
318 | { | |
319 | pex_unix_open_read, | |
320 | pex_unix_open_write, | |
321 | pex_unix_exec_child, | |
322 | pex_unix_close, | |
323 | pex_unix_wait, | |
324 | pex_unix_pipe, | |
325 | pex_unix_fdopenr, | |
3db2e6dd | 326 | pex_unix_fdopenw, |
b109e79a ILT |
327 | pex_unix_cleanup |
328 | }; | |
329 | ||
330 | /* Return a newly initialized pex_obj structure. */ | |
331 | ||
332 | struct pex_obj * | |
333 | pex_init (int flags, const char *pname, const char *tempbase) | |
334 | { | |
335 | return pex_init_common (flags, pname, tempbase, &funcs); | |
336 | } | |
337 | ||
338 | /* Open a file for reading. */ | |
339 | ||
340 | static int | |
341 | pex_unix_open_read (struct pex_obj *obj ATTRIBUTE_UNUSED, const char *name, | |
342 | int binary ATTRIBUTE_UNUSED) | |
343 | { | |
344 | return open (name, O_RDONLY); | |
345 | } | |
346 | ||
347 | /* Open a file for writing. */ | |
348 | ||
349 | static int | |
350 | pex_unix_open_write (struct pex_obj *obj ATTRIBUTE_UNUSED, const char *name, | |
351 | int binary ATTRIBUTE_UNUSED) | |
352 | { | |
353 | /* Note that we can't use O_EXCL here because gcc may have already | |
354 | created the temporary file via make_temp_file. */ | |
355 | return open (name, O_WRONLY | O_CREAT | O_TRUNC, PUBLIC_MODE); | |
356 | } | |
5a17353c | 357 | |
b109e79a ILT |
358 | /* Close a file. */ |
359 | ||
360 | static int | |
361 | pex_unix_close (struct pex_obj *obj ATTRIBUTE_UNUSED, int fd) | |
362 | { | |
363 | return close (fd); | |
364 | } | |
365 | ||
366 | /* Report an error from a child process. We don't use stdio routines, | |
367 | because we might be here due to a vfork call. */ | |
368 | ||
369 | static void | |
370 | pex_child_error (struct pex_obj *obj, const char *executable, | |
371 | const char *errmsg, int err) | |
372 | { | |
c90188f6 BE |
373 | int retval = 0; |
374 | #define writeerr(s) retval |= (write (STDERR_FILE_NO, s, strlen (s)) < 0) | |
b109e79a ILT |
375 | writeerr (obj->pname); |
376 | writeerr (": error trying to exec '"); | |
377 | writeerr (executable); | |
378 | writeerr ("': "); | |
379 | writeerr (errmsg); | |
380 | writeerr (": "); | |
381 | writeerr (xstrerror (err)); | |
382 | writeerr ("\n"); | |
17f99e29 | 383 | #undef writeerr |
c90188f6 BE |
384 | /* Exit with -2 if the error output failed, too. */ |
385 | _exit (retval == 0 ? -1 : -2); | |
b109e79a ILT |
386 | } |
387 | ||
388 | /* Execute a child. */ | |
389 | ||
014a8caf DD |
390 | extern char **environ; |
391 | ||
9c55e064 RH |
392 | #if defined(HAVE_SPAWNVE) && defined(HAVE_SPAWNVPE) |
393 | /* Implementation of pex->exec_child using the Cygwin spawn operation. */ | |
394 | ||
395 | /* Subroutine of pex_unix_exec_child. Move OLD_FD to a new file descriptor | |
396 | to be stored in *PNEW_FD, save the flags in *PFLAGS, and arrange for the | |
397 | saved copy to be close-on-exec. Move CHILD_FD into OLD_FD. If CHILD_FD | |
398 | is -1, OLD_FD is to be closed. Return -1 on error. */ | |
399 | ||
400 | static int | |
401 | save_and_install_fd(int *pnew_fd, int *pflags, int old_fd, int child_fd) | |
402 | { | |
403 | int new_fd, flags; | |
404 | ||
405 | flags = fcntl (old_fd, F_GETFD); | |
406 | ||
407 | /* If we could not retrieve the flags, then OLD_FD was not open. */ | |
408 | if (flags < 0) | |
409 | { | |
410 | new_fd = -1, flags = 0; | |
411 | if (child_fd >= 0 && dup2 (child_fd, old_fd) < 0) | |
412 | return -1; | |
413 | } | |
414 | /* If we wish to close OLD_FD, just mark it CLOEXEC. */ | |
415 | else if (child_fd == -1) | |
416 | { | |
417 | new_fd = old_fd; | |
418 | if ((flags & FD_CLOEXEC) == 0 && fcntl (old_fd, F_SETFD, FD_CLOEXEC) < 0) | |
419 | return -1; | |
420 | } | |
421 | /* Otherwise we need to save a copy of OLD_FD before installing CHILD_FD. */ | |
422 | else | |
423 | { | |
424 | #ifdef F_DUPFD_CLOEXEC | |
425 | new_fd = fcntl (old_fd, F_DUPFD_CLOEXEC, 3); | |
426 | if (new_fd < 0) | |
427 | return -1; | |
428 | #else | |
429 | /* Prefer F_DUPFD over dup in order to avoid getting a new fd | |
430 | in the range 0-2, right where a new stderr fd might get put. */ | |
431 | new_fd = fcntl (old_fd, F_DUPFD, 3); | |
432 | if (new_fd < 0) | |
433 | return -1; | |
434 | if (fcntl (new_fd, F_SETFD, FD_CLOEXEC) < 0) | |
435 | return -1; | |
436 | #endif | |
437 | if (dup2 (child_fd, old_fd) < 0) | |
438 | return -1; | |
439 | } | |
440 | ||
441 | *pflags = flags; | |
442 | if (pnew_fd) | |
443 | *pnew_fd = new_fd; | |
444 | else if (new_fd != old_fd) | |
445 | abort (); | |
446 | ||
447 | return 0; | |
448 | } | |
449 | ||
450 | /* Subroutine of pex_unix_exec_child. Move SAVE_FD back to OLD_FD | |
451 | restoring FLAGS. If SAVE_FD < 0, OLD_FD is to be closed. */ | |
452 | ||
453 | static int | |
454 | restore_fd(int old_fd, int save_fd, int flags) | |
455 | { | |
456 | /* For SAVE_FD < 0, all we have to do is restore the | |
457 | "closed-ness" of the original. */ | |
458 | if (save_fd < 0) | |
459 | return close (old_fd); | |
460 | ||
461 | /* For SAVE_FD == OLD_FD, all we have to do is restore the | |
462 | original setting of the CLOEXEC flag. */ | |
463 | if (save_fd == old_fd) | |
464 | { | |
465 | if (flags & FD_CLOEXEC) | |
466 | return 0; | |
467 | return fcntl (old_fd, F_SETFD, flags); | |
468 | } | |
469 | ||
470 | /* Otherwise we have to move the descriptor back, restore the flags, | |
471 | and close the saved copy. */ | |
472 | #ifdef HAVE_DUP3 | |
473 | if (flags == FD_CLOEXEC) | |
474 | { | |
475 | if (dup3 (save_fd, old_fd, O_CLOEXEC) < 0) | |
476 | return -1; | |
477 | } | |
478 | else | |
479 | #endif | |
480 | { | |
481 | if (dup2 (save_fd, old_fd) < 0) | |
482 | return -1; | |
483 | if (flags != 0 && fcntl (old_fd, F_SETFD, flags) < 0) | |
484 | return -1; | |
485 | } | |
486 | return close (save_fd); | |
487 | } | |
488 | ||
489 | static pid_t | |
490 | pex_unix_exec_child (struct pex_obj *obj ATTRIBUTE_UNUSED, | |
491 | int flags, const char *executable, | |
492 | char * const * argv, char * const * env, | |
493 | int in, int out, int errdes, int toclose, | |
494 | const char **errmsg, int *err) | |
495 | { | |
496 | int fl_in = 0, fl_out = 0, fl_err = 0, fl_tc = 0; | |
497 | int save_in = -1, save_out = -1, save_err = -1; | |
498 | int max, retries; | |
499 | pid_t pid; | |
500 | ||
501 | if (flags & PEX_STDERR_TO_STDOUT) | |
502 | errdes = out; | |
503 | ||
504 | /* We need the three standard file descriptors to be set up as for | |
505 | the child before we perform the spawn. The file descriptors for | |
506 | the parent need to be moved and marked for close-on-exec. */ | |
507 | if (in != STDIN_FILE_NO | |
508 | && save_and_install_fd (&save_in, &fl_in, STDIN_FILE_NO, in) < 0) | |
509 | goto error_dup2; | |
510 | if (out != STDOUT_FILE_NO | |
511 | && save_and_install_fd (&save_out, &fl_out, STDOUT_FILE_NO, out) < 0) | |
512 | goto error_dup2; | |
513 | if (errdes != STDERR_FILE_NO | |
514 | && save_and_install_fd (&save_err, &fl_err, STDERR_FILE_NO, errdes) < 0) | |
515 | goto error_dup2; | |
516 | if (toclose >= 0 | |
517 | && save_and_install_fd (NULL, &fl_tc, toclose, -1) < 0) | |
518 | goto error_dup2; | |
519 | ||
520 | /* Now that we've moved the file descriptors for the child into place, | |
521 | close the originals. Be careful not to close any of the standard | |
522 | file descriptors that we just set up. */ | |
523 | max = -1; | |
524 | if (errdes >= 0) | |
525 | max = STDERR_FILE_NO; | |
526 | else if (out >= 0) | |
527 | max = STDOUT_FILE_NO; | |
528 | else if (in >= 0) | |
529 | max = STDIN_FILE_NO; | |
530 | if (in > max) | |
531 | close (in); | |
532 | if (out > max) | |
533 | close (out); | |
534 | if (errdes > max && errdes != out) | |
535 | close (errdes); | |
536 | ||
537 | /* If we were not given an environment, use the global environment. */ | |
538 | if (env == NULL) | |
539 | env = environ; | |
540 | ||
541 | /* Launch the program. If we get EAGAIN (normally out of pid's), try | |
542 | again a few times with increasing backoff times. */ | |
543 | retries = 0; | |
544 | while (1) | |
545 | { | |
546 | typedef const char * const *cc_cp; | |
547 | ||
548 | if (flags & PEX_SEARCH) | |
549 | pid = spawnvpe (_P_NOWAITO, executable, (cc_cp)argv, (cc_cp)env); | |
550 | else | |
551 | pid = spawnve (_P_NOWAITO, executable, (cc_cp)argv, (cc_cp)env); | |
552 | ||
553 | if (pid > 0) | |
554 | break; | |
555 | ||
556 | *err = errno; | |
557 | *errmsg = "spawn"; | |
558 | if (errno != EAGAIN || ++retries == 4) | |
559 | return (pid_t) -1; | |
560 | sleep (1 << retries); | |
561 | } | |
562 | ||
563 | /* Success. Restore the parent's file descriptors that we saved above. */ | |
564 | if (toclose >= 0 | |
565 | && restore_fd (toclose, toclose, fl_tc) < 0) | |
566 | goto error_dup2; | |
567 | if (in != STDIN_FILE_NO | |
568 | && restore_fd (STDIN_FILE_NO, save_in, fl_in) < 0) | |
569 | goto error_dup2; | |
570 | if (out != STDOUT_FILE_NO | |
571 | && restore_fd (STDOUT_FILE_NO, save_out, fl_out) < 0) | |
572 | goto error_dup2; | |
573 | if (errdes != STDERR_FILE_NO | |
574 | && restore_fd (STDERR_FILE_NO, save_err, fl_err) < 0) | |
575 | goto error_dup2; | |
576 | ||
577 | return pid; | |
578 | ||
579 | error_dup2: | |
580 | *err = errno; | |
581 | *errmsg = "dup2"; | |
582 | return (pid_t) -1; | |
583 | } | |
584 | ||
585 | #else | |
586 | /* Implementation of pex->exec_child using standard vfork + exec. */ | |
587 | ||
29d89e07 | 588 | static pid_t |
b109e79a | 589 | pex_unix_exec_child (struct pex_obj *obj, int flags, const char *executable, |
014a8caf DD |
590 | char * const * argv, char * const * env, |
591 | int in, int out, int errdes, | |
cb6c09ac | 592 | int toclose, const char **errmsg, int *err) |
b109e79a ILT |
593 | { |
594 | pid_t pid; | |
014a8caf | 595 | |
b109e79a ILT |
596 | /* We declare these to be volatile to avoid warnings from gcc about |
597 | them being clobbered by vfork. */ | |
598 | volatile int sleep_interval; | |
599 | volatile int retries; | |
12a7367e | 600 | |
16b8170d DE |
601 | /* We vfork and then set environ in the child before calling execvp. |
602 | This clobbers the parent's environ so we need to restore it. | |
603 | It would be nice to use one of the exec* functions that takes an | |
604 | environment as a parameter, but that may have portability issues. */ | |
605 | char **save_environ = environ; | |
606 | ||
5a17353c DD |
607 | sleep_interval = 1; |
608 | pid = -1; | |
b109e79a | 609 | for (retries = 0; retries < 4; ++retries) |
5a17353c | 610 | { |
12a7367e | 611 | pid = vfork (); |
5a17353c DD |
612 | if (pid >= 0) |
613 | break; | |
614 | sleep (sleep_interval); | |
615 | sleep_interval *= 2; | |
616 | } | |
617 | ||
618 | switch (pid) | |
619 | { | |
620 | case -1: | |
b109e79a ILT |
621 | *err = errno; |
622 | *errmsg = VFORK_STRING; | |
29d89e07 | 623 | return (pid_t) -1; |
5a17353c | 624 | |
b109e79a ILT |
625 | case 0: |
626 | /* Child process. */ | |
627 | if (in != STDIN_FILE_NO) | |
5a17353c | 628 | { |
b109e79a ILT |
629 | if (dup2 (in, STDIN_FILE_NO) < 0) |
630 | pex_child_error (obj, executable, "dup2", errno); | |
631 | if (close (in) < 0) | |
632 | pex_child_error (obj, executable, "close", errno); | |
5a17353c | 633 | } |
b109e79a | 634 | if (out != STDOUT_FILE_NO) |
5a17353c | 635 | { |
b109e79a ILT |
636 | if (dup2 (out, STDOUT_FILE_NO) < 0) |
637 | pex_child_error (obj, executable, "dup2", errno); | |
638 | if (close (out) < 0) | |
639 | pex_child_error (obj, executable, "close", errno); | |
640 | } | |
641 | if (errdes != STDERR_FILE_NO) | |
642 | { | |
643 | if (dup2 (errdes, STDERR_FILE_NO) < 0) | |
644 | pex_child_error (obj, executable, "dup2", errno); | |
645 | if (close (errdes) < 0) | |
646 | pex_child_error (obj, executable, "close", errno); | |
647 | } | |
cb6c09ac DD |
648 | if (toclose >= 0) |
649 | { | |
650 | if (close (toclose) < 0) | |
651 | pex_child_error (obj, executable, "close", errno); | |
652 | } | |
b109e79a ILT |
653 | if ((flags & PEX_STDERR_TO_STDOUT) != 0) |
654 | { | |
655 | if (dup2 (STDOUT_FILE_NO, STDERR_FILE_NO) < 0) | |
656 | pex_child_error (obj, executable, "dup2", errno); | |
657 | } | |
014a8caf DD |
658 | |
659 | if (env) | |
16b8170d DE |
660 | { |
661 | /* NOTE: In a standard vfork implementation this clobbers the | |
662 | parent's copy of environ "too" (in reality there's only one copy). | |
663 | This is ok as we restore it below. */ | |
664 | environ = (char**) env; | |
665 | } | |
014a8caf | 666 | |
b109e79a ILT |
667 | if ((flags & PEX_SEARCH) != 0) |
668 | { | |
9fef968a | 669 | execvp (executable, to_ptr32 (argv)); |
b109e79a | 670 | pex_child_error (obj, executable, "execvp", errno); |
5a17353c | 671 | } |
12a7367e | 672 | else |
b109e79a | 673 | { |
9fef968a | 674 | execv (executable, to_ptr32 (argv)); |
b109e79a ILT |
675 | pex_child_error (obj, executable, "execv", errno); |
676 | } | |
12a7367e | 677 | |
5a17353c | 678 | /* NOTREACHED */ |
29d89e07 | 679 | return (pid_t) -1; |
5a17353c DD |
680 | |
681 | default: | |
b109e79a | 682 | /* Parent process. */ |
16b8170d DE |
683 | |
684 | /* Restore environ. | |
685 | Note that the parent either doesn't run until the child execs/exits | |
686 | (standard vfork behaviour), or if it does run then vfork is behaving | |
687 | more like fork. In either case we needn't worry about clobbering | |
688 | the child's copy of environ. */ | |
689 | environ = save_environ; | |
690 | ||
b109e79a ILT |
691 | if (in != STDIN_FILE_NO) |
692 | { | |
693 | if (close (in) < 0) | |
694 | { | |
695 | *err = errno; | |
696 | *errmsg = "close"; | |
29d89e07 | 697 | return (pid_t) -1; |
b109e79a ILT |
698 | } |
699 | } | |
700 | if (out != STDOUT_FILE_NO) | |
701 | { | |
702 | if (close (out) < 0) | |
703 | { | |
704 | *err = errno; | |
705 | *errmsg = "close"; | |
29d89e07 | 706 | return (pid_t) -1; |
b109e79a ILT |
707 | } |
708 | } | |
709 | if (errdes != STDERR_FILE_NO) | |
710 | { | |
711 | if (close (errdes) < 0) | |
712 | { | |
713 | *err = errno; | |
714 | *errmsg = "close"; | |
29d89e07 | 715 | return (pid_t) -1; |
b109e79a ILT |
716 | } |
717 | } | |
718 | ||
29d89e07 | 719 | return pid; |
5a17353c DD |
720 | } |
721 | } | |
9c55e064 | 722 | #endif /* SPAWN */ |
5a17353c | 723 | |
b109e79a ILT |
724 | /* Wait for a child process to complete. */ |
725 | ||
726 | static int | |
29d89e07 | 727 | pex_unix_wait (struct pex_obj *obj, pid_t pid, int *status, |
b109e79a ILT |
728 | struct pex_time *time, int done, const char **errmsg, |
729 | int *err) | |
5a17353c | 730 | { |
b109e79a ILT |
731 | /* If we are cleaning up when the caller didn't retrieve process |
732 | status for some reason, encourage the process to go away. */ | |
733 | if (done) | |
734 | kill (pid, SIGTERM); | |
735 | ||
736 | if (pex_wait (obj, pid, status, time) < 0) | |
737 | { | |
738 | *err = errno; | |
739 | *errmsg = "wait"; | |
740 | return -1; | |
741 | } | |
742 | ||
743 | return 0; | |
744 | } | |
745 | ||
746 | /* Create a pipe. */ | |
747 | ||
748 | static int | |
749 | pex_unix_pipe (struct pex_obj *obj ATTRIBUTE_UNUSED, int *p, | |
750 | int binary ATTRIBUTE_UNUSED) | |
751 | { | |
752 | return pipe (p); | |
753 | } | |
754 | ||
755 | /* Get a FILE pointer to read from a file descriptor. */ | |
756 | ||
757 | static FILE * | |
758 | pex_unix_fdopenr (struct pex_obj *obj ATTRIBUTE_UNUSED, int fd, | |
759 | int binary ATTRIBUTE_UNUSED) | |
760 | { | |
761 | return fdopen (fd, "r"); | |
762 | } | |
763 | ||
3db2e6dd DD |
764 | static FILE * |
765 | pex_unix_fdopenw (struct pex_obj *obj ATTRIBUTE_UNUSED, int fd, | |
766 | int binary ATTRIBUTE_UNUSED) | |
767 | { | |
768 | if (fcntl (fd, F_SETFD, FD_CLOEXEC) < 0) | |
769 | return NULL; | |
770 | return fdopen (fd, "w"); | |
771 | } | |
772 | ||
b109e79a ILT |
773 | static void |
774 | pex_unix_cleanup (struct pex_obj *obj ATTRIBUTE_UNUSED) | |
775 | { | |
776 | #if !defined (HAVE_WAIT4) && !defined (HAVE_WAITPID) | |
777 | while (obj->sysdep != NULL) | |
778 | { | |
779 | struct status_list *this; | |
780 | struct status_list *next; | |
781 | ||
782 | this = (struct status_list *) obj->sysdep; | |
783 | next = this->next; | |
784 | free (this); | |
785 | obj->sysdep = (void *) next; | |
786 | } | |
787 | #endif | |
5a17353c | 788 | } |