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
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
30 #include "namespace.h"
31 #include <sys/queue.h>
42 #include "un-namespace.h"
43 #include "libc_private.h"
45 extern char **environ;
47 struct __posix_spawnattr {
50 struct sched_param sa_schedparam;
52 sigset_t sa_sigdefault;
56 struct __posix_spawn_file_actions {
57 STAILQ_HEAD(, __posix_spawn_file_actions_entry) fa_list;
60 typedef struct __posix_spawn_file_actions_entry {
61 STAILQ_ENTRY(__posix_spawn_file_actions_entry) fae_list;
62 enum { FAE_OPEN, FAE_DUP2, FAE_CLOSE } fae_action;
68 #define fae_path fae_data.open.path
70 #define fae_oflag fae_data.open.oflag
72 #define fae_mode fae_data.open.mode
76 #define fae_newfildes fae_data.dup2.newfildes
79 } posix_spawn_file_actions_entry_t;
86 process_spawnattr(const posix_spawnattr_t sa)
88 struct sigaction sigact = { .sa_flags = 0, .sa_handler = SIG_DFL };
92 * POSIX doesn't really describe in which order everything
93 * should be set. We'll just set them in the order in which they
97 /* Set process group */
98 if (sa->sa_flags & POSIX_SPAWN_SETPGROUP) {
99 if (setpgid(0, sa->sa_pgroup) != 0)
103 /* Set scheduler policy */
104 if (sa->sa_flags & POSIX_SPAWN_SETSCHEDULER) {
105 if (sched_setscheduler(0, sa->sa_schedpolicy,
106 &sa->sa_schedparam) != 0)
108 } else if (sa->sa_flags & POSIX_SPAWN_SETSCHEDPARAM) {
109 if (sched_setparam(0, &sa->sa_schedparam) != 0)
113 /* Reset user ID's */
114 if (sa->sa_flags & POSIX_SPAWN_RESETIDS) {
115 if (setegid(getgid()) != 0)
117 if (seteuid(getuid()) != 0)
122 * Set signal masks/defaults.
123 * Use unwrapped syscall, libthr is in undefined state after vfork().
125 if (sa->sa_flags & POSIX_SPAWN_SETSIGMASK) {
126 __sys_sigprocmask(SIG_SETMASK, &sa->sa_sigmask, NULL);
129 if (sa->sa_flags & POSIX_SPAWN_SETSIGDEF) {
130 for (i = 1; i <= _SIG_MAXSIG; i++) {
131 if (sigismember(&sa->sa_sigdefault, i))
132 if (__sys_sigaction(i, &sigact, NULL) != 0)
141 process_file_actions_entry(posix_spawn_file_actions_entry_t *fae)
145 switch (fae->fae_action) {
147 /* Perform an open(), make it use the right fd */
148 fd = _open(fae->fae_path, fae->fae_oflag, fae->fae_mode);
151 if (fd != fae->fae_fildes) {
152 if (_dup2(fd, fae->fae_fildes) == -1) {
155 return (saved_errno);
157 if (_close(fd) != 0) {
162 if (_fcntl(fae->fae_fildes, F_SETFD, 0) == -1)
166 /* Perform a dup2() */
167 if (_dup2(fae->fae_fildes, fae->fae_newfildes) == -1)
169 if (_fcntl(fae->fae_newfildes, F_SETFD, 0) == -1)
173 /* Perform a close(), do not fail if already closed */
174 (void)_close(fae->fae_fildes);
181 process_file_actions(const posix_spawn_file_actions_t fa)
183 posix_spawn_file_actions_entry_t *fae;
186 /* Replay all file descriptor modifications */
187 STAILQ_FOREACH(fae, &fa->fa_list, fae_list) {
188 error = process_file_actions_entry(fae);
196 do_posix_spawn(pid_t *pid, const char *path,
197 const posix_spawn_file_actions_t *fa,
198 const posix_spawnattr_t *sa,
199 char * const argv[], char * const envp[], int use_env_path)
202 volatile int error = 0;
210 error = process_spawnattr(*sa);
215 error = process_file_actions(*fa);
220 _execvpe(path, argv, envp != NULL ? envp : environ);
222 _execve(path, argv, envp != NULL ? envp : environ);
227 _waitpid(p, NULL, WNOHANG);
228 else if (pid != NULL)
235 posix_spawn(pid_t *pid, const char *path,
236 const posix_spawn_file_actions_t *fa,
237 const posix_spawnattr_t *sa,
238 char * const argv[], char * const envp[])
240 return do_posix_spawn(pid, path, fa, sa, argv, envp, 0);
244 posix_spawnp(pid_t *pid, const char *path,
245 const posix_spawn_file_actions_t *fa,
246 const posix_spawnattr_t *sa,
247 char * const argv[], char * const envp[])
249 return do_posix_spawn(pid, path, fa, sa, argv, envp, 1);
253 * File descriptor actions
257 posix_spawn_file_actions_init(posix_spawn_file_actions_t *ret)
259 posix_spawn_file_actions_t fa;
261 fa = malloc(sizeof(struct __posix_spawn_file_actions));
265 STAILQ_INIT(&fa->fa_list);
271 posix_spawn_file_actions_destroy(posix_spawn_file_actions_t *fa)
273 posix_spawn_file_actions_entry_t *fae;
275 while ((fae = STAILQ_FIRST(&(*fa)->fa_list)) != NULL) {
276 /* Remove file action entry from the queue */
277 STAILQ_REMOVE_HEAD(&(*fa)->fa_list, fae_list);
279 /* Deallocate file action entry */
280 if (fae->fae_action == FAE_OPEN)
290 posix_spawn_file_actions_addopen(posix_spawn_file_actions_t * __restrict fa,
291 int fildes, const char * __restrict path, int oflag, mode_t mode)
293 posix_spawn_file_actions_entry_t *fae;
299 /* Allocate object */
300 fae = malloc(sizeof(posix_spawn_file_actions_entry_t));
304 /* Set values and store in queue */
305 fae->fae_action = FAE_OPEN;
306 fae->fae_path = strdup(path);
307 if (fae->fae_path == NULL) {
312 fae->fae_fildes = fildes;
313 fae->fae_oflag = oflag;
314 fae->fae_mode = mode;
316 STAILQ_INSERT_TAIL(&(*fa)->fa_list, fae, fae_list);
321 posix_spawn_file_actions_adddup2(posix_spawn_file_actions_t *fa,
322 int fildes, int newfildes)
324 posix_spawn_file_actions_entry_t *fae;
326 if (fildes < 0 || newfildes < 0)
329 /* Allocate object */
330 fae = malloc(sizeof(posix_spawn_file_actions_entry_t));
334 /* Set values and store in queue */
335 fae->fae_action = FAE_DUP2;
336 fae->fae_fildes = fildes;
337 fae->fae_newfildes = newfildes;
339 STAILQ_INSERT_TAIL(&(*fa)->fa_list, fae, fae_list);
344 posix_spawn_file_actions_addclose(posix_spawn_file_actions_t *fa,
347 posix_spawn_file_actions_entry_t *fae;
352 /* Allocate object */
353 fae = malloc(sizeof(posix_spawn_file_actions_entry_t));
357 /* Set values and store in queue */
358 fae->fae_action = FAE_CLOSE;
359 fae->fae_fildes = fildes;
361 STAILQ_INSERT_TAIL(&(*fa)->fa_list, fae, fae_list);
370 posix_spawnattr_init(posix_spawnattr_t *ret)
372 posix_spawnattr_t sa;
374 sa = calloc(1, sizeof(struct __posix_spawnattr));
378 /* Set defaults as specified by POSIX, cleared above */
384 posix_spawnattr_destroy(posix_spawnattr_t *sa)
391 posix_spawnattr_getflags(const posix_spawnattr_t * __restrict sa,
392 short * __restrict flags)
394 *flags = (*sa)->sa_flags;
399 posix_spawnattr_getpgroup(const posix_spawnattr_t * __restrict sa,
400 pid_t * __restrict pgroup)
402 *pgroup = (*sa)->sa_pgroup;
407 posix_spawnattr_getschedparam(const posix_spawnattr_t * __restrict sa,
408 struct sched_param * __restrict schedparam)
410 *schedparam = (*sa)->sa_schedparam;
415 posix_spawnattr_getschedpolicy(const posix_spawnattr_t * __restrict sa,
416 int * __restrict schedpolicy)
418 *schedpolicy = (*sa)->sa_schedpolicy;
423 posix_spawnattr_getsigdefault(const posix_spawnattr_t * __restrict sa,
424 sigset_t * __restrict sigdefault)
426 *sigdefault = (*sa)->sa_sigdefault;
431 posix_spawnattr_getsigmask(const posix_spawnattr_t * __restrict sa,
432 sigset_t * __restrict sigmask)
434 *sigmask = (*sa)->sa_sigmask;
439 posix_spawnattr_setflags(posix_spawnattr_t *sa, short flags)
441 (*sa)->sa_flags = flags;
446 posix_spawnattr_setpgroup(posix_spawnattr_t *sa, pid_t pgroup)
448 (*sa)->sa_pgroup = pgroup;
453 posix_spawnattr_setschedparam(posix_spawnattr_t * __restrict sa,
454 const struct sched_param * __restrict schedparam)
456 (*sa)->sa_schedparam = *schedparam;
461 posix_spawnattr_setschedpolicy(posix_spawnattr_t *sa, int schedpolicy)
463 (*sa)->sa_schedpolicy = schedpolicy;
468 posix_spawnattr_setsigdefault(posix_spawnattr_t * __restrict sa,
469 const sigset_t * __restrict sigdefault)
471 (*sa)->sa_sigdefault = *sigdefault;
476 posix_spawnattr_setsigmask(posix_spawnattr_t * __restrict sa,
477 const sigset_t * __restrict sigmask)
479 (*sa)->sa_sigmask = *sigmask;