1 /* -*- mode: C; c-file-style: "gnu" -*- */
2 /* dbus-spawn.c Wrapper around fork/exec
4 * Copyright (C) 2002, 2003, 2004 Red Hat, Inc.
5 * Copyright (C) 2003 CodeFactory AB
7 * Licensed under the Academic Free License version 2.1
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 #include "dbus-spawn.h"
25 #include "dbus-sysdeps.h"
26 #include "dbus-internals.h"
27 #include "dbus-test.h"
28 #include "dbus-protocol.h"
38 * @addtogroup DBusInternalsUtils
43 * I'm pretty sure this whole spawn file could be made simpler,
44 * if you thought about it a bit.
48 * Enumeration for status of a read()
52 READ_STATUS_OK, /**< Read succeeded */
53 READ_STATUS_ERROR, /**< Some kind of error */
54 READ_STATUS_EOF /**< EOF returned */
67 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
69 retval = READ_STATUS_OK;
76 to_read = sizeof (int) * n_ints_in_buf - bytes;
87 if (chunk < 0 && errno == EINTR)
92 dbus_set_error (error,
93 DBUS_ERROR_SPAWN_FAILED,
94 "Failed to read from child pipe (%s)",
95 _dbus_strerror (errno));
97 retval = READ_STATUS_ERROR;
102 retval = READ_STATUS_EOF;
109 *n_ints_read = (int)(bytes / sizeof(int));
122 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
124 retval = READ_STATUS_OK;
131 to_read = sizeof (pid_t) - bytes;
139 ((char*)buf) + bytes,
141 if (chunk < 0 && errno == EINTR)
146 dbus_set_error (error,
147 DBUS_ERROR_SPAWN_FAILED,
148 "Failed to read from child pipe (%s)",
149 _dbus_strerror (errno));
151 retval = READ_STATUS_ERROR;
156 retval = READ_STATUS_EOF;
166 /* The implementation uses an intermediate child between the main process
167 * and the grandchild. The grandchild is our spawned process. The intermediate
168 * child is a babysitter process; it keeps track of when the grandchild
169 * exits/crashes, and reaps the grandchild.
172 /* Messages from children to parents */
175 CHILD_EXITED, /* This message is followed by the exit status int */
176 CHILD_FORK_FAILED, /* Followed by errno */
177 CHILD_EXEC_FAILED, /* Followed by errno */
178 CHILD_PID /* Followed by pid_t */
182 * Babysitter implementation details
184 struct DBusBabysitter
186 int refcount; /**< Reference count */
188 char *executable; /**< executable name to use in error messages */
190 int socket_to_babysitter; /**< Connection to the babysitter process */
191 int error_pipe_from_child; /**< Connection to the process that does the exec() */
193 pid_t sitter_pid; /**< PID Of the babysitter */
194 pid_t grandchild_pid; /**< PID of the grandchild */
196 DBusWatchList *watches; /**< Watches */
198 DBusWatch *error_watch; /**< Error pipe watch */
199 DBusWatch *sitter_watch; /**< Sitter pipe watch */
201 int errnum; /**< Error number */
202 int status; /**< Exit status code */
203 unsigned int have_child_status : 1; /**< True if child status has been reaped */
204 unsigned int have_fork_errnum : 1; /**< True if we have an error code from fork() */
205 unsigned int have_exec_errnum : 1; /**< True if we have an error code from exec() */
208 static DBusBabysitter*
209 _dbus_babysitter_new (void)
211 DBusBabysitter *sitter;
213 sitter = dbus_new0 (DBusBabysitter, 1);
217 sitter->refcount = 1;
219 sitter->socket_to_babysitter = -1;
220 sitter->error_pipe_from_child = -1;
222 sitter->sitter_pid = -1;
223 sitter->grandchild_pid = -1;
225 sitter->watches = _dbus_watch_list_new ();
226 if (sitter->watches == NULL)
232 _dbus_babysitter_unref (sitter);
237 * Increment the reference count on the babysitter object.
239 * @param sitter the babysitter
240 * @returns the babysitter
243 _dbus_babysitter_ref (DBusBabysitter *sitter)
245 _dbus_assert (sitter != NULL);
246 _dbus_assert (sitter->refcount > 0);
248 sitter->refcount += 1;
254 * Decrement the reference count on the babysitter object.
255 * When the reference count of the babysitter object reaches
256 * zero, the babysitter is killed and the child that was being
257 * babysat gets emancipated.
259 * @param sitter the babysitter
262 _dbus_babysitter_unref (DBusBabysitter *sitter)
264 _dbus_assert (sitter != NULL);
265 _dbus_assert (sitter->refcount > 0);
267 sitter->refcount -= 1;
268 if (sitter->refcount == 0)
270 if (sitter->socket_to_babysitter >= 0)
272 /* If we haven't forked other babysitters
273 * since this babysitter and socket were
274 * created then this close will cause the
275 * babysitter to wake up from poll with
276 * a hangup and then the babysitter will
279 _dbus_close_socket (sitter->socket_to_babysitter, NULL);
280 sitter->socket_to_babysitter = -1;
283 if (sitter->error_pipe_from_child >= 0)
285 _dbus_close_socket (sitter->error_pipe_from_child, NULL);
286 sitter->error_pipe_from_child = -1;
289 if (sitter->sitter_pid > 0)
294 /* It's possible the babysitter died on its own above
295 * from the close, or was killed randomly
296 * by some other process, so first try to reap it
298 ret = waitpid (sitter->sitter_pid, &status, WNOHANG);
300 /* If we couldn't reap the child then kill it, and
304 kill (sitter->sitter_pid, SIGKILL);
308 ret = waitpid (sitter->sitter_pid, &status, 0);
314 else if (errno == ECHILD)
315 _dbus_warn ("Babysitter process not available to be reaped; should not happen\n");
317 _dbus_warn ("Unexpected error %d in waitpid() for babysitter: %s\n",
318 errno, _dbus_strerror (errno));
322 _dbus_verbose ("Reaped %ld, waiting for babysitter %ld\n",
323 (long) ret, (long) sitter->sitter_pid);
325 if (WIFEXITED (sitter->status))
326 _dbus_verbose ("Babysitter exited with status %d\n",
327 WEXITSTATUS (sitter->status));
328 else if (WIFSIGNALED (sitter->status))
329 _dbus_verbose ("Babysitter received signal %d\n",
330 WTERMSIG (sitter->status));
332 _dbus_verbose ("Babysitter exited abnormally\n");
335 sitter->sitter_pid = -1;
338 if (sitter->error_watch)
340 _dbus_watch_invalidate (sitter->error_watch);
341 _dbus_watch_unref (sitter->error_watch);
342 sitter->error_watch = NULL;
345 if (sitter->sitter_watch)
347 _dbus_watch_invalidate (sitter->sitter_watch);
348 _dbus_watch_unref (sitter->sitter_watch);
349 sitter->sitter_watch = NULL;
353 _dbus_watch_list_free (sitter->watches);
355 dbus_free (sitter->executable);
362 read_data (DBusBabysitter *sitter,
370 dbus_error_init (&error);
372 r = read_ints (fd, &what, 1, &got, &error);
376 case READ_STATUS_ERROR:
377 _dbus_warn ("Failed to read data from fd %d: %s\n", fd, error.message);
378 dbus_error_free (&error);
381 case READ_STATUS_EOF:
393 case CHILD_FORK_FAILED:
394 case CHILD_EXEC_FAILED:
398 r = read_ints (fd, &arg, 1, &got, &error);
402 case READ_STATUS_ERROR:
403 _dbus_warn ("Failed to read arg from fd %d: %s\n", fd, error.message);
404 dbus_error_free (&error);
406 case READ_STATUS_EOF:
414 if (what == CHILD_EXITED)
416 sitter->have_child_status = TRUE;
417 sitter->status = arg;
418 _dbus_verbose ("recorded child status exited = %d signaled = %d exitstatus = %d termsig = %d\n",
419 WIFEXITED (sitter->status), WIFSIGNALED (sitter->status),
420 WEXITSTATUS (sitter->status), WTERMSIG (sitter->status));
422 else if (what == CHILD_FORK_FAILED)
424 sitter->have_fork_errnum = TRUE;
425 sitter->errnum = arg;
426 _dbus_verbose ("recorded fork errnum %d\n", sitter->errnum);
428 else if (what == CHILD_EXEC_FAILED)
430 sitter->have_exec_errnum = TRUE;
431 sitter->errnum = arg;
432 _dbus_verbose ("recorded exec errnum %d\n", sitter->errnum);
441 r = read_pid (fd, &pid, &error);
445 case READ_STATUS_ERROR:
446 _dbus_warn ("Failed to read PID from fd %d: %s\n", fd, error.message);
447 dbus_error_free (&error);
449 case READ_STATUS_EOF:
455 sitter->grandchild_pid = pid;
457 _dbus_verbose ("recorded grandchild pid %d\n", sitter->grandchild_pid);
461 _dbus_warn ("Unknown message received from babysitter process\n");
470 close_socket_to_babysitter (DBusBabysitter *sitter)
472 _dbus_verbose ("Closing babysitter\n");
473 _dbus_close_socket (sitter->socket_to_babysitter, NULL);
474 sitter->socket_to_babysitter = -1;
478 close_error_pipe_from_child (DBusBabysitter *sitter)
480 _dbus_verbose ("Closing child error\n");
481 _dbus_close_socket (sitter->error_pipe_from_child, NULL);
482 sitter->error_pipe_from_child = -1;
486 handle_babysitter_socket (DBusBabysitter *sitter,
489 /* Even if we have POLLHUP, we want to keep reading
490 * data until POLLIN goes away; so this function only
491 * looks at HUP/ERR if no IN is set.
493 if (revents & _DBUS_POLLIN)
495 _dbus_verbose ("Reading data from babysitter\n");
496 if (read_data (sitter, sitter->socket_to_babysitter) != READ_STATUS_OK)
497 close_socket_to_babysitter (sitter);
499 else if (revents & (_DBUS_POLLERR | _DBUS_POLLHUP))
501 close_socket_to_babysitter (sitter);
506 handle_error_pipe (DBusBabysitter *sitter,
509 if (revents & _DBUS_POLLIN)
511 _dbus_verbose ("Reading data from child error\n");
512 if (read_data (sitter, sitter->error_pipe_from_child) != READ_STATUS_OK)
513 close_error_pipe_from_child (sitter);
515 else if (revents & (_DBUS_POLLERR | _DBUS_POLLHUP))
517 close_error_pipe_from_child (sitter);
521 /* returns whether there were any poll events handled */
523 babysitter_iteration (DBusBabysitter *sitter,
528 dbus_bool_t descriptors_ready;
530 descriptors_ready = FALSE;
534 if (sitter->error_pipe_from_child >= 0)
536 fds[i].fd = sitter->error_pipe_from_child;
537 fds[i].events = _DBUS_POLLIN;
542 if (sitter->socket_to_babysitter >= 0)
544 fds[i].fd = sitter->socket_to_babysitter;
545 fds[i].events = _DBUS_POLLIN;
554 ret = _dbus_poll (fds, i, 0);
555 if (ret == 0 && block)
556 ret = _dbus_poll (fds, i, -1);
560 descriptors_ready = TRUE;
565 if (fds[i].fd == sitter->error_pipe_from_child)
566 handle_error_pipe (sitter, fds[i].revents);
567 else if (fds[i].fd == sitter->socket_to_babysitter)
568 handle_babysitter_socket (sitter, fds[i].revents);
573 return descriptors_ready;
577 * Macro returns #TRUE if the babysitter still has live sockets open to the
578 * babysitter child or the grandchild.
580 #define LIVE_CHILDREN(sitter) ((sitter)->socket_to_babysitter >= 0 || (sitter)->error_pipe_from_child >= 0)
583 * Blocks until the babysitter process gives us the PID of the spawned grandchild,
584 * then kills the spawned grandchild.
586 * @param sitter the babysitter object
589 _dbus_babysitter_kill_child (DBusBabysitter *sitter)
591 /* be sure we have the PID of the child */
592 while (LIVE_CHILDREN (sitter) &&
593 sitter->grandchild_pid == -1)
594 babysitter_iteration (sitter, TRUE);
596 _dbus_verbose ("Got child PID %ld for killing\n",
597 (long) sitter->grandchild_pid);
599 if (sitter->grandchild_pid == -1)
600 return; /* child is already dead, or we're so hosed we'll never recover */
602 kill (sitter->grandchild_pid, SIGKILL);
606 * Checks whether the child has exited, without blocking.
608 * @param sitter the babysitter
611 _dbus_babysitter_get_child_exited (DBusBabysitter *sitter)
614 /* Be sure we're up-to-date */
615 while (LIVE_CHILDREN (sitter) &&
616 babysitter_iteration (sitter, FALSE))
619 /* We will have exited the babysitter when the child has exited */
620 return sitter->socket_to_babysitter < 0;
624 * Sets the #DBusError with an explanation of why the spawned
625 * child process exited (on a signal, or whatever). If
626 * the child process has not exited, does nothing (error
627 * will remain unset).
629 * @param sitter the babysitter
630 * @param error an error to fill in
633 _dbus_babysitter_set_child_exit_error (DBusBabysitter *sitter,
636 if (!_dbus_babysitter_get_child_exited (sitter))
639 /* Note that if exec fails, we will also get a child status
640 * from the babysitter saying the child exited,
641 * so we need to give priority to the exec error
643 if (sitter->have_exec_errnum)
645 dbus_set_error (error, DBUS_ERROR_SPAWN_EXEC_FAILED,
646 "Failed to execute program %s: %s",
647 sitter->executable, _dbus_strerror (sitter->errnum));
649 else if (sitter->have_fork_errnum)
651 dbus_set_error (error, DBUS_ERROR_NO_MEMORY,
652 "Failed to fork a new process %s: %s",
653 sitter->executable, _dbus_strerror (sitter->errnum));
655 else if (sitter->have_child_status)
657 if (WIFEXITED (sitter->status))
658 dbus_set_error (error, DBUS_ERROR_SPAWN_CHILD_EXITED,
659 "Process %s exited with status %d",
660 sitter->executable, WEXITSTATUS (sitter->status));
661 else if (WIFSIGNALED (sitter->status))
662 dbus_set_error (error, DBUS_ERROR_SPAWN_CHILD_SIGNALED,
663 "Process %s received signal %d",
664 sitter->executable, WTERMSIG (sitter->status));
666 dbus_set_error (error, DBUS_ERROR_FAILED,
667 "Process %s exited abnormally",
672 dbus_set_error (error, DBUS_ERROR_FAILED,
673 "Process %s exited, reason unknown",
679 * Sets watch functions to notify us when the
680 * babysitter object needs to read/write file descriptors.
682 * @param sitter the babysitter
683 * @param add_function function to begin monitoring a new descriptor.
684 * @param remove_function function to stop monitoring a descriptor.
685 * @param toggled_function function to notify when the watch is enabled/disabled
686 * @param data data to pass to add_function and remove_function.
687 * @param free_data_function function to be called to free the data.
688 * @returns #FALSE on failure (no memory)
691 _dbus_babysitter_set_watch_functions (DBusBabysitter *sitter,
692 DBusAddWatchFunction add_function,
693 DBusRemoveWatchFunction remove_function,
694 DBusWatchToggledFunction toggled_function,
696 DBusFreeFunction free_data_function)
698 return _dbus_watch_list_set_functions (sitter->watches,
707 handle_watch (DBusWatch *watch,
708 unsigned int condition,
711 DBusBabysitter *sitter = data;
716 if (condition & DBUS_WATCH_READABLE)
717 revents |= _DBUS_POLLIN;
718 if (condition & DBUS_WATCH_ERROR)
719 revents |= _DBUS_POLLERR;
720 if (condition & DBUS_WATCH_HANGUP)
721 revents |= _DBUS_POLLHUP;
723 fd = dbus_watch_get_fd (watch);
725 if (fd == sitter->error_pipe_from_child)
726 handle_error_pipe (sitter, revents);
727 else if (fd == sitter->socket_to_babysitter)
728 handle_babysitter_socket (sitter, revents);
730 while (LIVE_CHILDREN (sitter) &&
731 babysitter_iteration (sitter, FALSE))
737 /** Helps remember which end of the pipe is which */
739 /** Helps remember which end of the pipe is which */
743 /* Avoids a danger in threaded situations (calling close()
744 * on a file descriptor twice, and another thread has
745 * re-opened it since the first close)
748 close_and_invalidate (int *fd)
756 ret = _dbus_close_socket (*fd, NULL);
767 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
771 dbus_set_error (error,
772 DBUS_ERROR_SPAWN_FAILED,
773 "Failed to create pipe for communicating with child process (%s)",
774 _dbus_strerror (errno));
782 do_write (int fd, const void *buf, size_t count)
784 size_t bytes_written;
791 ret = write (fd, ((const char*)buf) + bytes_written, count - bytes_written);
799 _dbus_warn ("Failed to write data to pipe!\n");
800 exit (1); /* give up, we suck */
804 bytes_written += ret;
806 if (bytes_written < count)
811 write_err_and_exit (int fd, int msg)
815 do_write (fd, &msg, sizeof (msg));
816 do_write (fd, &en, sizeof (en));
822 write_pid (int fd, pid_t pid)
826 do_write (fd, &msg, sizeof (msg));
827 do_write (fd, &pid, sizeof (pid));
831 write_status_and_exit (int fd, int status)
833 int msg = CHILD_EXITED;
835 do_write (fd, &msg, sizeof (msg));
836 do_write (fd, &status, sizeof (status));
842 do_exec (int child_err_report_fd,
844 DBusSpawnChildSetupFunc child_setup,
847 #ifdef DBUS_BUILD_TESTS
851 _dbus_verbose_reset ();
852 _dbus_verbose ("Child process has PID %lu\n",
856 (* child_setup) (user_data);
858 #ifdef DBUS_BUILD_TESTS
859 max_open = sysconf (_SC_OPEN_MAX);
861 for (i = 3; i < max_open; i++)
865 if (i == child_err_report_fd)
868 retval = fcntl (i, F_GETFD);
870 if (retval != -1 && !(retval & FD_CLOEXEC))
871 _dbus_warn ("Fd %d did not have the close-on-exec flag set!\n", i);
875 execv (argv[0], argv);
878 write_err_and_exit (child_err_report_fd,
883 check_babysit_events (pid_t grandchild_pid,
892 ret = waitpid (grandchild_pid, &status, WNOHANG);
893 /* The man page says EINTR can't happen with WNOHANG,
894 * but there are reports of it (maybe only with valgrind?)
897 while (ret < 0 && errno == EINTR);
901 _dbus_verbose ("no child exited\n");
903 ; /* no child exited */
907 /* This isn't supposed to happen. */
908 _dbus_warn ("unexpected waitpid() failure in check_babysit_events(): %s\n",
909 _dbus_strerror (errno));
912 else if (ret == grandchild_pid)
915 _dbus_verbose ("reaped child pid %ld\n", (long) ret);
917 write_status_and_exit (parent_pipe, status);
921 _dbus_warn ("waitpid() reaped pid %d that we've never heard of\n",
926 if (revents & _DBUS_POLLIN)
928 _dbus_verbose ("babysitter got POLLIN from parent pipe\n");
931 if (revents & (_DBUS_POLLERR | _DBUS_POLLHUP))
933 /* Parent is gone, so we just exit */
934 _dbus_verbose ("babysitter got POLLERR or POLLHUP from parent\n");
939 static int babysit_sigchld_pipe = -1;
942 babysit_signal_handler (int signo)
946 write (babysit_sigchld_pipe, &b, 1);
952 babysit (pid_t grandchild_pid,
957 /* We don't exec, so we keep parent state, such as the pid that
958 * _dbus_verbose() uses. Reset the pid here.
960 _dbus_verbose_reset ();
962 /* I thought SIGCHLD would just wake up the poll, but
963 * that didn't seem to work, so added this pipe.
964 * Probably the pipe is more likely to work on busted
965 * operating systems anyhow.
967 if (pipe (sigchld_pipe) < 0)
969 _dbus_warn ("Not enough file descriptors to create pipe in babysitter process\n");
973 babysit_sigchld_pipe = sigchld_pipe[WRITE_END];
975 _dbus_set_signal_handler (SIGCHLD, babysit_signal_handler);
977 write_pid (parent_pipe, grandchild_pid);
979 check_babysit_events (grandchild_pid, parent_pipe, 0);
985 pfds[0].fd = parent_pipe;
986 pfds[0].events = _DBUS_POLLIN;
989 pfds[1].fd = sigchld_pipe[READ_END];
990 pfds[1].events = _DBUS_POLLIN;
993 _dbus_poll (pfds, _DBUS_N_ELEMENTS (pfds), -1);
995 if (pfds[0].revents != 0)
997 check_babysit_events (grandchild_pid, parent_pipe, pfds[0].revents);
999 else if (pfds[1].revents & _DBUS_POLLIN)
1002 read (sigchld_pipe[READ_END], &b, 1);
1003 /* do waitpid check */
1004 check_babysit_events (grandchild_pid, parent_pipe, 0);
1012 * Spawns a new process. The executable name and argv[0]
1013 * are the same, both are provided in argv[0]. The child_setup
1014 * function is passed the given user_data and is run in the child
1015 * just before calling exec().
1017 * Also creates a "babysitter" which tracks the status of the
1018 * child process, advising the parent if the child exits.
1019 * If the spawn fails, no babysitter is created.
1020 * If sitter_p is #NULL, no babysitter is kept.
1022 * @param sitter_p return location for babysitter or #NULL
1023 * @param argv the executable and arguments
1024 * @param child_setup function to call in child pre-exec()
1025 * @param user_data user data for setup function
1026 * @param error error object to be filled in if function fails
1027 * @returns #TRUE on success, #FALSE if error is filled in
1030 _dbus_spawn_async_with_babysitter (DBusBabysitter **sitter_p,
1032 DBusSpawnChildSetupFunc child_setup,
1036 DBusBabysitter *sitter;
1037 int child_err_report_pipe[2] = { -1, -1 };
1038 int babysitter_pipe[2] = { -1, -1 };
1041 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1046 sitter = _dbus_babysitter_new ();
1049 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
1053 sitter->executable = _dbus_strdup (argv[0]);
1054 if (sitter->executable == NULL)
1056 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
1057 goto cleanup_and_fail;
1060 if (!make_pipe (child_err_report_pipe, error))
1061 goto cleanup_and_fail;
1063 _dbus_fd_set_close_on_exec (child_err_report_pipe[READ_END]);
1064 _dbus_fd_set_close_on_exec (child_err_report_pipe[WRITE_END]);
1066 if (!_dbus_full_duplex_pipe (&babysitter_pipe[0], &babysitter_pipe[1], TRUE, error))
1067 goto cleanup_and_fail;
1069 _dbus_fd_set_close_on_exec (babysitter_pipe[0]);
1070 _dbus_fd_set_close_on_exec (babysitter_pipe[1]);
1072 /* Setting up the babysitter is only useful in the parent,
1073 * but we don't want to run out of memory and fail
1074 * after we've already forked, since then we'd leak
1075 * child processes everywhere.
1077 sitter->error_watch = _dbus_watch_new (child_err_report_pipe[READ_END],
1078 DBUS_WATCH_READABLE,
1079 TRUE, handle_watch, sitter, NULL);
1080 if (sitter->error_watch == NULL)
1082 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
1083 goto cleanup_and_fail;
1086 if (!_dbus_watch_list_add_watch (sitter->watches, sitter->error_watch))
1088 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
1089 goto cleanup_and_fail;
1092 sitter->sitter_watch = _dbus_watch_new (babysitter_pipe[0],
1093 DBUS_WATCH_READABLE,
1094 TRUE, handle_watch, sitter, NULL);
1095 if (sitter->sitter_watch == NULL)
1097 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
1098 goto cleanup_and_fail;
1101 if (!_dbus_watch_list_add_watch (sitter->watches, sitter->sitter_watch))
1103 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
1104 goto cleanup_and_fail;
1107 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1113 dbus_set_error (error,
1114 DBUS_ERROR_SPAWN_FORK_FAILED,
1115 "Failed to fork (%s)",
1116 _dbus_strerror (errno));
1117 goto cleanup_and_fail;
1121 /* Immediate child, this is the babysitter process. */
1124 /* Be sure we crash if the parent exits
1125 * and we write to the err_report_pipe
1127 signal (SIGPIPE, SIG_DFL);
1129 /* Close the parent's end of the pipes. */
1130 close_and_invalidate (&child_err_report_pipe[READ_END]);
1131 close_and_invalidate (&babysitter_pipe[0]);
1133 /* Create the child that will exec () */
1134 grandchild_pid = fork ();
1136 if (grandchild_pid < 0)
1138 write_err_and_exit (babysitter_pipe[1],
1140 _dbus_assert_not_reached ("Got to code after write_err_and_exit()");
1142 else if (grandchild_pid == 0)
1144 do_exec (child_err_report_pipe[WRITE_END],
1146 child_setup, user_data);
1147 _dbus_assert_not_reached ("Got to code after exec() - should have exited on error");
1151 babysit (grandchild_pid, babysitter_pipe[1]);
1152 _dbus_assert_not_reached ("Got to code after babysit()");
1157 /* Close the uncared-about ends of the pipes */
1158 close_and_invalidate (&child_err_report_pipe[WRITE_END]);
1159 close_and_invalidate (&babysitter_pipe[1]);
1161 sitter->socket_to_babysitter = babysitter_pipe[0];
1162 babysitter_pipe[0] = -1;
1164 sitter->error_pipe_from_child = child_err_report_pipe[READ_END];
1165 child_err_report_pipe[READ_END] = -1;
1167 sitter->sitter_pid = pid;
1169 if (sitter_p != NULL)
1172 _dbus_babysitter_unref (sitter);
1174 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1181 _DBUS_ASSERT_ERROR_IS_SET (error);
1183 close_and_invalidate (&child_err_report_pipe[READ_END]);
1184 close_and_invalidate (&child_err_report_pipe[WRITE_END]);
1185 close_and_invalidate (&babysitter_pipe[0]);
1186 close_and_invalidate (&babysitter_pipe[1]);
1189 _dbus_babysitter_unref (sitter);
1196 #ifdef DBUS_BUILD_TESTS
1199 _dbus_babysitter_block_for_child_exit (DBusBabysitter *sitter)
1201 while (LIVE_CHILDREN (sitter))
1202 babysitter_iteration (sitter, TRUE);
1206 check_spawn_nonexistent (void *data)
1208 char *argv[4] = { NULL, NULL, NULL, NULL };
1209 DBusBabysitter *sitter;
1214 dbus_error_init (&error);
1216 /*** Test launching nonexistent binary */
1218 argv[0] = "/this/does/not/exist/32542sdgafgafdg";
1219 if (_dbus_spawn_async_with_babysitter (&sitter, argv,
1223 _dbus_babysitter_block_for_child_exit (sitter);
1224 _dbus_babysitter_set_child_exit_error (sitter, &error);
1228 _dbus_babysitter_unref (sitter);
1230 if (!dbus_error_is_set (&error))
1232 _dbus_warn ("Did not get an error launching nonexistent executable\n");
1236 if (!(dbus_error_has_name (&error, DBUS_ERROR_NO_MEMORY) ||
1237 dbus_error_has_name (&error, DBUS_ERROR_SPAWN_EXEC_FAILED)))
1239 _dbus_warn ("Not expecting error when launching nonexistent executable: %s: %s\n",
1240 error.name, error.message);
1241 dbus_error_free (&error);
1245 dbus_error_free (&error);
1251 check_spawn_segfault (void *data)
1253 char *argv[4] = { NULL, NULL, NULL, NULL };
1254 DBusBabysitter *sitter;
1259 dbus_error_init (&error);
1261 /*** Test launching segfault binary */
1263 argv[0] = TEST_SEGFAULT_BINARY;
1264 if (_dbus_spawn_async_with_babysitter (&sitter, argv,
1268 _dbus_babysitter_block_for_child_exit (sitter);
1269 _dbus_babysitter_set_child_exit_error (sitter, &error);
1273 _dbus_babysitter_unref (sitter);
1275 if (!dbus_error_is_set (&error))
1277 _dbus_warn ("Did not get an error launching segfaulting binary\n");
1281 if (!(dbus_error_has_name (&error, DBUS_ERROR_NO_MEMORY) ||
1282 dbus_error_has_name (&error, DBUS_ERROR_SPAWN_CHILD_SIGNALED)))
1284 _dbus_warn ("Not expecting error when launching segfaulting executable: %s: %s\n",
1285 error.name, error.message);
1286 dbus_error_free (&error);
1290 dbus_error_free (&error);
1296 check_spawn_exit (void *data)
1298 char *argv[4] = { NULL, NULL, NULL, NULL };
1299 DBusBabysitter *sitter;
1304 dbus_error_init (&error);
1306 /*** Test launching exit failure binary */
1308 argv[0] = TEST_EXIT_BINARY;
1309 if (_dbus_spawn_async_with_babysitter (&sitter, argv,
1313 _dbus_babysitter_block_for_child_exit (sitter);
1314 _dbus_babysitter_set_child_exit_error (sitter, &error);
1318 _dbus_babysitter_unref (sitter);
1320 if (!dbus_error_is_set (&error))
1322 _dbus_warn ("Did not get an error launching binary that exited with failure code\n");
1326 if (!(dbus_error_has_name (&error, DBUS_ERROR_NO_MEMORY) ||
1327 dbus_error_has_name (&error, DBUS_ERROR_SPAWN_CHILD_EXITED)))
1329 _dbus_warn ("Not expecting error when launching exiting executable: %s: %s\n",
1330 error.name, error.message);
1331 dbus_error_free (&error);
1335 dbus_error_free (&error);
1341 check_spawn_and_kill (void *data)
1343 char *argv[4] = { NULL, NULL, NULL, NULL };
1344 DBusBabysitter *sitter;
1349 dbus_error_init (&error);
1351 /*** Test launching sleeping binary then killing it */
1353 argv[0] = TEST_SLEEP_FOREVER_BINARY;
1354 if (_dbus_spawn_async_with_babysitter (&sitter, argv,
1358 _dbus_babysitter_kill_child (sitter);
1360 _dbus_babysitter_block_for_child_exit (sitter);
1362 _dbus_babysitter_set_child_exit_error (sitter, &error);
1366 _dbus_babysitter_unref (sitter);
1368 if (!dbus_error_is_set (&error))
1370 _dbus_warn ("Did not get an error after killing spawned binary\n");
1374 if (!(dbus_error_has_name (&error, DBUS_ERROR_NO_MEMORY) ||
1375 dbus_error_has_name (&error, DBUS_ERROR_SPAWN_CHILD_SIGNALED)))
1377 _dbus_warn ("Not expecting error when killing executable: %s: %s\n",
1378 error.name, error.message);
1379 dbus_error_free (&error);
1383 dbus_error_free (&error);
1389 _dbus_spawn_test (const char *test_data_dir)
1391 if (!_dbus_test_oom_handling ("spawn_nonexistent",
1392 check_spawn_nonexistent,
1396 if (!_dbus_test_oom_handling ("spawn_segfault",
1397 check_spawn_segfault,
1401 if (!_dbus_test_oom_handling ("spawn_exit",
1406 if (!_dbus_test_oom_handling ("spawn_and_kill",
1407 check_spawn_and_kill,