2 * Copyright (c) 2008 Ed Schouten <ed@FreeBSD.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * $FreeBSD: src/lib/libc/gen/posix_spawn.c,v 1.6 2008/10/23 15:32:06 rdivacky Exp $
29 #include "namespace.h"
30 #include <sys/queue.h>
40 #include "un-namespace.h"
41 #include "libc_private.h"
43 extern char **environ;
45 struct __posix_spawnattr {
48 struct sched_param sa_schedparam;
50 sigset_t sa_sigdefault;
54 struct __posix_spawn_file_actions {
55 STAILQ_HEAD(, __posix_spawn_file_actions_entry) fa_list;
58 typedef struct __posix_spawn_file_actions_entry {
59 STAILQ_ENTRY(__posix_spawn_file_actions_entry) fae_list;
60 enum { FAE_OPEN, FAE_DUP2, FAE_CLOSE } fae_action;
66 #define fae_path fae_data.open.path
68 #define fae_oflag fae_data.open.oflag
70 #define fae_mode fae_data.open.mode
74 #define fae_newfildes fae_data.dup2.newfildes
77 } posix_spawn_file_actions_entry_t;
84 process_spawnattr(const posix_spawnattr_t sa)
86 struct sigaction sigact = { .sa_flags = 0, .sa_handler = SIG_DFL };
90 * POSIX doesn't really describe in which order everything
91 * should be set. We'll just set them in the order in which they
95 /* Set process group */
96 if (sa->sa_flags & POSIX_SPAWN_SETPGROUP) {
97 if (setpgid(0, sa->sa_pgroup) != 0)
101 /* Set scheduler policy */
102 if (sa->sa_flags & POSIX_SPAWN_SETSCHEDULER) {
103 if (sched_setscheduler(0, sa->sa_schedpolicy,
104 &sa->sa_schedparam) != 0)
106 } else if (sa->sa_flags & POSIX_SPAWN_SETSCHEDPARAM) {
107 if (sched_setparam(0, &sa->sa_schedparam) != 0)
111 /* Reset user ID's */
112 if (sa->sa_flags & POSIX_SPAWN_RESETIDS) {
113 if (setegid(getgid()) != 0)
115 if (seteuid(getuid()) != 0)
119 /* Set signal masks/defaults */
120 if (sa->sa_flags & POSIX_SPAWN_SETSIGMASK) {
121 _sigprocmask(SIG_SETMASK, &sa->sa_sigmask, NULL);
124 if (sa->sa_flags & POSIX_SPAWN_SETSIGDEF) {
125 for (i = 1; i <= _SIG_MAXSIG; i++) {
126 if (sigismember(&sa->sa_sigdefault, i))
127 if (_sigaction(i, &sigact, NULL) != 0)
136 process_file_actions_entry(posix_spawn_file_actions_entry_t *fae)
140 switch (fae->fae_action) {
142 /* Perform an open(), make it use the right fd */
143 fd = _open(fae->fae_path, fae->fae_oflag, fae->fae_mode);
146 if (fd != fae->fae_fildes) {
147 if (_dup2(fd, fae->fae_fildes) == -1)
149 if (_close(fd) != 0) {
154 if (_fcntl(fae->fae_fildes, F_SETFD, 0) == -1)
158 /* Perform a dup2() */
159 if (_dup2(fae->fae_fildes, fae->fae_newfildes) == -1)
161 if (_fcntl(fae->fae_newfildes, F_SETFD, 0) == -1)
165 /* Perform a close() */
166 if (_close(fae->fae_fildes) != 0) {
176 process_file_actions(const posix_spawn_file_actions_t fa)
178 posix_spawn_file_actions_entry_t *fae;
181 /* Replay all file descriptor modifications */
182 STAILQ_FOREACH(fae, &fa->fa_list, fae_list) {
183 error = process_file_actions_entry(fae);
191 do_posix_spawn(pid_t *pid, const char *path,
192 const posix_spawn_file_actions_t *fa,
193 const posix_spawnattr_t *sa, char * const argv[],
194 char * const envp[], int use_env_path)
197 volatile int error = 0;
205 error = process_spawnattr(*sa);
210 error = process_file_actions(*fa);
215 _execvpe(path, argv, envp != NULL ? envp : environ);
217 _execve(path, argv, envp != NULL ? envp : environ);
228 posix_spawn(pid_t *pid, const char *path, const posix_spawn_file_actions_t *fa,
229 const posix_spawnattr_t *sa, char * const argv[],
232 return do_posix_spawn(pid, path, fa, sa, argv, envp, 0);
236 posix_spawnp(pid_t *pid, const char *path, const posix_spawn_file_actions_t *fa,
237 const posix_spawnattr_t *sa, char * const argv[],
240 return do_posix_spawn(pid, path, fa, sa, argv, envp, 1);
244 * File descriptor actions
248 posix_spawn_file_actions_init(posix_spawn_file_actions_t *ret)
250 posix_spawn_file_actions_t fa;
252 fa = malloc(sizeof(struct __posix_spawn_file_actions));
256 STAILQ_INIT(&fa->fa_list);
262 posix_spawn_file_actions_destroy(posix_spawn_file_actions_t *fa)
264 posix_spawn_file_actions_entry_t *fae;
266 while ((fae = STAILQ_FIRST(&(*fa)->fa_list)) != NULL) {
267 /* Remove file action entry from the queue */
268 STAILQ_REMOVE_HEAD(&(*fa)->fa_list, fae_list);
270 /* Deallocate file action entry */
271 if (fae->fae_action == FAE_OPEN)
281 posix_spawn_file_actions_addopen(posix_spawn_file_actions_t * __restrict fa,
282 int fildes, const char * __restrict path,
283 int oflag, mode_t mode)
285 posix_spawn_file_actions_entry_t *fae;
291 /* Allocate object */
292 fae = malloc(sizeof(posix_spawn_file_actions_entry_t));
296 /* Set values and store in queue */
297 fae->fae_action = FAE_OPEN;
298 fae->fae_path = strdup(path);
299 if (fae->fae_path == NULL) {
304 fae->fae_fildes = fildes;
305 fae->fae_oflag = oflag;
306 fae->fae_mode = mode;
308 STAILQ_INSERT_TAIL(&(*fa)->fa_list, fae, fae_list);
313 posix_spawn_file_actions_adddup2(posix_spawn_file_actions_t *fa,
314 int fildes, int newfildes)
316 posix_spawn_file_actions_entry_t *fae;
318 if (fildes < 0 || newfildes < 0)
321 /* Allocate object */
322 fae = malloc(sizeof(posix_spawn_file_actions_entry_t));
326 /* Set values and store in queue */
327 fae->fae_action = FAE_DUP2;
328 fae->fae_fildes = fildes;
329 fae->fae_newfildes = newfildes;
331 STAILQ_INSERT_TAIL(&(*fa)->fa_list, fae, fae_list);
336 posix_spawn_file_actions_addclose(posix_spawn_file_actions_t *fa,
339 posix_spawn_file_actions_entry_t *fae;
344 /* Allocate object */
345 fae = malloc(sizeof(posix_spawn_file_actions_entry_t));
349 /* Set values and store in queue */
350 fae->fae_action = FAE_CLOSE;
351 fae->fae_fildes = fildes;
353 STAILQ_INSERT_TAIL(&(*fa)->fa_list, fae, fae_list);
362 posix_spawnattr_init(posix_spawnattr_t *ret)
364 posix_spawnattr_t sa;
366 sa = calloc(1, sizeof(struct __posix_spawnattr));
370 /* Set defaults as specified by POSIX, cleared above */
376 posix_spawnattr_destroy(posix_spawnattr_t *sa)
383 posix_spawnattr_getflags(const posix_spawnattr_t * __restrict sa,
384 short * __restrict flags)
386 *flags = (*sa)->sa_flags;
391 posix_spawnattr_getpgroup(const posix_spawnattr_t * __restrict sa,
392 pid_t * __restrict pgroup)
394 *pgroup = (*sa)->sa_pgroup;
399 posix_spawnattr_getschedparam(const posix_spawnattr_t * __restrict sa,
400 struct sched_param * __restrict schedparam)
402 *schedparam = (*sa)->sa_schedparam;
407 posix_spawnattr_getschedpolicy(const posix_spawnattr_t * __restrict sa,
408 int * __restrict schedpolicy)
410 *schedpolicy = (*sa)->sa_schedpolicy;
415 posix_spawnattr_getsigdefault(const posix_spawnattr_t * __restrict sa,
416 sigset_t * __restrict sigdefault)
418 *sigdefault = (*sa)->sa_sigdefault;
423 posix_spawnattr_getsigmask(const posix_spawnattr_t * __restrict sa,
424 sigset_t * __restrict sigmask)
426 *sigmask = (*sa)->sa_sigmask;
431 posix_spawnattr_setflags(posix_spawnattr_t *sa, short flags)
433 (*sa)->sa_flags = flags;
438 posix_spawnattr_setpgroup(posix_spawnattr_t *sa, pid_t pgroup)
440 (*sa)->sa_pgroup = pgroup;
445 posix_spawnattr_setschedparam(posix_spawnattr_t * __restrict sa,
446 const struct sched_param * __restrict schedparam)
448 (*sa)->sa_schedparam = *schedparam;
453 posix_spawnattr_setschedpolicy(posix_spawnattr_t *sa, int schedpolicy)
455 (*sa)->sa_schedpolicy = schedpolicy;
460 posix_spawnattr_setsigdefault(posix_spawnattr_t * __restrict sa,
461 const sigset_t * __restrict sigdefault)
463 (*sa)->sa_sigdefault = *sigdefault;
468 posix_spawnattr_setsigmask(posix_spawnattr_t * __restrict sa,
469 const sigset_t * __restrict sigmask)
471 (*sa)->sa_sigmask = *sigmask;