1 /* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
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-unix.h"
26 #include "dbus-internals.h"
27 #include "dbus-test.h"
28 #include "dbus-protocol.h"
40 * @addtogroup DBusInternalsUtils
45 * I'm pretty sure this whole spawn file could be made simpler,
46 * if you thought about it a bit.
50 * Enumeration for status of a read()
54 READ_STATUS_OK, /**< Read succeeded */
55 READ_STATUS_ERROR, /**< Some kind of error */
56 READ_STATUS_EOF /**< EOF returned */
69 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
71 retval = READ_STATUS_OK;
78 to_read = sizeof (int) * n_ints_in_buf - bytes;
89 if (chunk < 0 && errno == EINTR)
94 dbus_set_error (error,
95 DBUS_ERROR_SPAWN_FAILED,
96 "Failed to read from child pipe (%s)",
97 _dbus_strerror (errno));
99 retval = READ_STATUS_ERROR;
104 retval = READ_STATUS_EOF;
111 *n_ints_read = (int)(bytes / sizeof(int));
124 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
126 retval = READ_STATUS_OK;
133 to_read = sizeof (pid_t) - bytes;
141 ((char*)buf) + bytes,
143 if (chunk < 0 && errno == EINTR)
148 dbus_set_error (error,
149 DBUS_ERROR_SPAWN_FAILED,
150 "Failed to read from child pipe (%s)",
151 _dbus_strerror (errno));
153 retval = READ_STATUS_ERROR;
158 retval = READ_STATUS_EOF;
168 /* The implementation uses an intermediate child between the main process
169 * and the grandchild. The grandchild is our spawned process. The intermediate
170 * child is a babysitter process; it keeps track of when the grandchild
171 * exits/crashes, and reaps the grandchild.
174 /* Messages from children to parents */
177 CHILD_EXITED, /* This message is followed by the exit status int */
178 CHILD_FORK_FAILED, /* Followed by errno */
179 CHILD_EXEC_FAILED, /* Followed by errno */
180 CHILD_PID /* Followed by pid_t */
184 * Babysitter implementation details
186 struct DBusBabysitter
188 int refcount; /**< Reference count */
190 char *executable; /**< executable name to use in error messages */
192 int socket_to_babysitter; /**< Connection to the babysitter process */
193 int error_pipe_from_child; /**< Connection to the process that does the exec() */
195 pid_t sitter_pid; /**< PID Of the babysitter */
196 pid_t grandchild_pid; /**< PID of the grandchild */
198 DBusWatchList *watches; /**< Watches */
200 DBusWatch *error_watch; /**< Error pipe watch */
201 DBusWatch *sitter_watch; /**< Sitter pipe watch */
203 int errnum; /**< Error number */
204 int status; /**< Exit status code */
205 unsigned int have_child_status : 1; /**< True if child status has been reaped */
206 unsigned int have_fork_errnum : 1; /**< True if we have an error code from fork() */
207 unsigned int have_exec_errnum : 1; /**< True if we have an error code from exec() */
210 static DBusBabysitter*
211 _dbus_babysitter_new (void)
213 DBusBabysitter *sitter;
215 sitter = dbus_new0 (DBusBabysitter, 1);
219 sitter->refcount = 1;
221 sitter->socket_to_babysitter = -1;
222 sitter->error_pipe_from_child = -1;
224 sitter->sitter_pid = -1;
225 sitter->grandchild_pid = -1;
227 sitter->watches = _dbus_watch_list_new ();
228 if (sitter->watches == NULL)
234 _dbus_babysitter_unref (sitter);
239 * Increment the reference count on the babysitter object.
241 * @param sitter the babysitter
242 * @returns the babysitter
245 _dbus_babysitter_ref (DBusBabysitter *sitter)
247 _dbus_assert (sitter != NULL);
248 _dbus_assert (sitter->refcount > 0);
250 sitter->refcount += 1;
256 * Decrement the reference count on the babysitter object.
257 * When the reference count of the babysitter object reaches
258 * zero, the babysitter is killed and the child that was being
259 * babysat gets emancipated.
261 * @param sitter the babysitter
264 _dbus_babysitter_unref (DBusBabysitter *sitter)
266 _dbus_assert (sitter != NULL);
267 _dbus_assert (sitter->refcount > 0);
269 sitter->refcount -= 1;
270 if (sitter->refcount == 0)
272 if (sitter->socket_to_babysitter >= 0)
274 /* If we haven't forked other babysitters
275 * since this babysitter and socket were
276 * created then this close will cause the
277 * babysitter to wake up from poll with
278 * a hangup and then the babysitter will
281 _dbus_close_socket (sitter->socket_to_babysitter, NULL);
282 sitter->socket_to_babysitter = -1;
285 if (sitter->error_pipe_from_child >= 0)
287 _dbus_close_socket (sitter->error_pipe_from_child, NULL);
288 sitter->error_pipe_from_child = -1;
291 if (sitter->sitter_pid > 0)
296 /* It's possible the babysitter died on its own above
297 * from the close, or was killed randomly
298 * by some other process, so first try to reap it
300 ret = waitpid (sitter->sitter_pid, &status, WNOHANG);
302 /* If we couldn't reap the child then kill it, and
306 kill (sitter->sitter_pid, SIGKILL);
310 ret = waitpid (sitter->sitter_pid, &status, 0);
316 else if (errno == ECHILD)
317 _dbus_warn ("Babysitter process not available to be reaped; should not happen\n");
319 _dbus_warn ("Unexpected error %d in waitpid() for babysitter: %s\n",
320 errno, _dbus_strerror (errno));
324 _dbus_verbose ("Reaped %ld, waiting for babysitter %ld\n",
325 (long) ret, (long) sitter->sitter_pid);
327 if (WIFEXITED (sitter->status))
328 _dbus_verbose ("Babysitter exited with status %d\n",
329 WEXITSTATUS (sitter->status));
330 else if (WIFSIGNALED (sitter->status))
331 _dbus_verbose ("Babysitter received signal %d\n",
332 WTERMSIG (sitter->status));
334 _dbus_verbose ("Babysitter exited abnormally\n");
337 sitter->sitter_pid = -1;
340 if (sitter->error_watch)
342 _dbus_watch_invalidate (sitter->error_watch);
343 _dbus_watch_unref (sitter->error_watch);
344 sitter->error_watch = NULL;
347 if (sitter->sitter_watch)
349 _dbus_watch_invalidate (sitter->sitter_watch);
350 _dbus_watch_unref (sitter->sitter_watch);
351 sitter->sitter_watch = NULL;
355 _dbus_watch_list_free (sitter->watches);
357 dbus_free (sitter->executable);
364 read_data (DBusBabysitter *sitter,
372 dbus_error_init (&error);
374 r = read_ints (fd, &what, 1, &got, &error);
378 case READ_STATUS_ERROR:
379 _dbus_warn ("Failed to read data from fd %d: %s\n", fd, error.message);
380 dbus_error_free (&error);
383 case READ_STATUS_EOF:
395 case CHILD_FORK_FAILED:
396 case CHILD_EXEC_FAILED:
400 r = read_ints (fd, &arg, 1, &got, &error);
404 case READ_STATUS_ERROR:
405 _dbus_warn ("Failed to read arg from fd %d: %s\n", fd, error.message);
406 dbus_error_free (&error);
408 case READ_STATUS_EOF:
416 if (what == CHILD_EXITED)
418 sitter->have_child_status = TRUE;
419 sitter->status = arg;
420 _dbus_verbose ("recorded child status exited = %d signaled = %d exitstatus = %d termsig = %d\n",
421 WIFEXITED (sitter->status), WIFSIGNALED (sitter->status),
422 WEXITSTATUS (sitter->status), WTERMSIG (sitter->status));
424 else if (what == CHILD_FORK_FAILED)
426 sitter->have_fork_errnum = TRUE;
427 sitter->errnum = arg;
428 _dbus_verbose ("recorded fork errnum %d\n", sitter->errnum);
430 else if (what == CHILD_EXEC_FAILED)
432 sitter->have_exec_errnum = TRUE;
433 sitter->errnum = arg;
434 _dbus_verbose ("recorded exec errnum %d\n", sitter->errnum);
443 r = read_pid (fd, &pid, &error);
447 case READ_STATUS_ERROR:
448 _dbus_warn ("Failed to read PID from fd %d: %s\n", fd, error.message);
449 dbus_error_free (&error);
451 case READ_STATUS_EOF:
457 sitter->grandchild_pid = pid;
459 _dbus_verbose ("recorded grandchild pid %d\n", sitter->grandchild_pid);
463 _dbus_warn ("Unknown message received from babysitter process\n");
472 close_socket_to_babysitter (DBusBabysitter *sitter)
474 _dbus_verbose ("Closing babysitter\n");
475 _dbus_close_socket (sitter->socket_to_babysitter, NULL);
476 sitter->socket_to_babysitter = -1;
480 close_error_pipe_from_child (DBusBabysitter *sitter)
482 _dbus_verbose ("Closing child error\n");
483 _dbus_close_socket (sitter->error_pipe_from_child, NULL);
484 sitter->error_pipe_from_child = -1;
488 handle_babysitter_socket (DBusBabysitter *sitter,
491 /* Even if we have POLLHUP, we want to keep reading
492 * data until POLLIN goes away; so this function only
493 * looks at HUP/ERR if no IN is set.
495 if (revents & _DBUS_POLLIN)
497 _dbus_verbose ("Reading data from babysitter\n");
498 if (read_data (sitter, sitter->socket_to_babysitter) != READ_STATUS_OK)
499 close_socket_to_babysitter (sitter);
501 else if (revents & (_DBUS_POLLERR | _DBUS_POLLHUP))
503 close_socket_to_babysitter (sitter);
508 handle_error_pipe (DBusBabysitter *sitter,
511 if (revents & _DBUS_POLLIN)
513 _dbus_verbose ("Reading data from child error\n");
514 if (read_data (sitter, sitter->error_pipe_from_child) != READ_STATUS_OK)
515 close_error_pipe_from_child (sitter);
517 else if (revents & (_DBUS_POLLERR | _DBUS_POLLHUP))
519 close_error_pipe_from_child (sitter);
523 /* returns whether there were any poll events handled */
525 babysitter_iteration (DBusBabysitter *sitter,
530 dbus_bool_t descriptors_ready;
532 descriptors_ready = FALSE;
536 if (sitter->error_pipe_from_child >= 0)
538 fds[i].fd = sitter->error_pipe_from_child;
539 fds[i].events = _DBUS_POLLIN;
544 if (sitter->socket_to_babysitter >= 0)
546 fds[i].fd = sitter->socket_to_babysitter;
547 fds[i].events = _DBUS_POLLIN;
556 ret = _dbus_poll (fds, i, 0);
557 if (ret == 0 && block)
558 ret = _dbus_poll (fds, i, -1);
562 descriptors_ready = TRUE;
567 if (fds[i].fd == sitter->error_pipe_from_child)
568 handle_error_pipe (sitter, fds[i].revents);
569 else if (fds[i].fd == sitter->socket_to_babysitter)
570 handle_babysitter_socket (sitter, fds[i].revents);
575 return descriptors_ready;
579 * Macro returns #TRUE if the babysitter still has live sockets open to the
580 * babysitter child or the grandchild.
582 #define LIVE_CHILDREN(sitter) ((sitter)->socket_to_babysitter >= 0 || (sitter)->error_pipe_from_child >= 0)
585 * Blocks until the babysitter process gives us the PID of the spawned grandchild,
586 * then kills the spawned grandchild.
588 * @param sitter the babysitter object
591 _dbus_babysitter_kill_child (DBusBabysitter *sitter)
593 /* be sure we have the PID of the child */
594 while (LIVE_CHILDREN (sitter) &&
595 sitter->grandchild_pid == -1)
596 babysitter_iteration (sitter, TRUE);
598 _dbus_verbose ("Got child PID %ld for killing\n",
599 (long) sitter->grandchild_pid);
601 if (sitter->grandchild_pid == -1)
602 return; /* child is already dead, or we're so hosed we'll never recover */
604 kill (sitter->grandchild_pid, SIGKILL);
608 * Checks whether the child has exited, without blocking.
610 * @param sitter the babysitter
613 _dbus_babysitter_get_child_exited (DBusBabysitter *sitter)
616 /* Be sure we're up-to-date */
617 while (LIVE_CHILDREN (sitter) &&
618 babysitter_iteration (sitter, FALSE))
621 /* We will have exited the babysitter when the child has exited */
622 return sitter->socket_to_babysitter < 0;
626 * Sets the #DBusError with an explanation of why the spawned
627 * child process exited (on a signal, or whatever). If
628 * the child process has not exited, does nothing (error
629 * will remain unset).
631 * @param sitter the babysitter
632 * @param error an error to fill in
635 _dbus_babysitter_set_child_exit_error (DBusBabysitter *sitter,
638 if (!_dbus_babysitter_get_child_exited (sitter))
641 /* Note that if exec fails, we will also get a child status
642 * from the babysitter saying the child exited,
643 * so we need to give priority to the exec error
645 if (sitter->have_exec_errnum)
647 dbus_set_error (error, DBUS_ERROR_SPAWN_EXEC_FAILED,
648 "Failed to execute program %s: %s",
649 sitter->executable, _dbus_strerror (sitter->errnum));
651 else if (sitter->have_fork_errnum)
653 dbus_set_error (error, DBUS_ERROR_NO_MEMORY,
654 "Failed to fork a new process %s: %s",
655 sitter->executable, _dbus_strerror (sitter->errnum));
657 else if (sitter->have_child_status)
659 if (WIFEXITED (sitter->status))
660 dbus_set_error (error, DBUS_ERROR_SPAWN_CHILD_EXITED,
661 "Process %s exited with status %d",
662 sitter->executable, WEXITSTATUS (sitter->status));
663 else if (WIFSIGNALED (sitter->status))
664 dbus_set_error (error, DBUS_ERROR_SPAWN_CHILD_SIGNALED,
665 "Process %s received signal %d",
666 sitter->executable, WTERMSIG (sitter->status));
668 dbus_set_error (error, DBUS_ERROR_FAILED,
669 "Process %s exited abnormally",
674 dbus_set_error (error, DBUS_ERROR_FAILED,
675 "Process %s exited, reason unknown",
681 * Sets watch functions to notify us when the
682 * babysitter object needs to read/write file descriptors.
684 * @param sitter the babysitter
685 * @param add_function function to begin monitoring a new descriptor.
686 * @param remove_function function to stop monitoring a descriptor.
687 * @param toggled_function function to notify when the watch is enabled/disabled
688 * @param data data to pass to add_function and remove_function.
689 * @param free_data_function function to be called to free the data.
690 * @returns #FALSE on failure (no memory)
693 _dbus_babysitter_set_watch_functions (DBusBabysitter *sitter,
694 DBusAddWatchFunction add_function,
695 DBusRemoveWatchFunction remove_function,
696 DBusWatchToggledFunction toggled_function,
698 DBusFreeFunction free_data_function)
700 return _dbus_watch_list_set_functions (sitter->watches,
709 handle_watch (DBusWatch *watch,
710 unsigned int condition,
713 DBusBabysitter *sitter = data;
718 if (condition & DBUS_WATCH_READABLE)
719 revents |= _DBUS_POLLIN;
720 if (condition & DBUS_WATCH_ERROR)
721 revents |= _DBUS_POLLERR;
722 if (condition & DBUS_WATCH_HANGUP)
723 revents |= _DBUS_POLLHUP;
725 fd = dbus_watch_get_socket (watch);
727 if (fd == sitter->error_pipe_from_child)
728 handle_error_pipe (sitter, revents);
729 else if (fd == sitter->socket_to_babysitter)
730 handle_babysitter_socket (sitter, revents);
732 while (LIVE_CHILDREN (sitter) &&
733 babysitter_iteration (sitter, FALSE))
739 /** Helps remember which end of the pipe is which */
741 /** Helps remember which end of the pipe is which */
745 /* Avoids a danger in threaded situations (calling close()
746 * on a file descriptor twice, and another thread has
747 * re-opened it since the first close)
750 close_and_invalidate (int *fd)
758 ret = _dbus_close_socket (*fd, NULL);
769 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
773 dbus_set_error (error,
774 DBUS_ERROR_SPAWN_FAILED,
775 "Failed to create pipe for communicating with child process (%s)",
776 _dbus_strerror (errno));
784 do_write (int fd, const void *buf, size_t count)
786 size_t bytes_written;
793 ret = write (fd, ((const char*)buf) + bytes_written, count - bytes_written);
801 _dbus_warn ("Failed to write data to pipe!\n");
802 exit (1); /* give up, we suck */
806 bytes_written += ret;
808 if (bytes_written < count)
813 write_err_and_exit (int fd, int msg)
817 do_write (fd, &msg, sizeof (msg));
818 do_write (fd, &en, sizeof (en));
824 write_pid (int fd, pid_t pid)
828 do_write (fd, &msg, sizeof (msg));
829 do_write (fd, &pid, sizeof (pid));
833 write_status_and_exit (int fd, int status)
835 int msg = CHILD_EXITED;
837 do_write (fd, &msg, sizeof (msg));
838 do_write (fd, &status, sizeof (status));
844 do_exec (int child_err_report_fd,
846 DBusSpawnChildSetupFunc child_setup,
849 #ifdef DBUS_BUILD_TESTS
853 _dbus_verbose_reset ();
854 _dbus_verbose ("Child process has PID " DBUS_PID_FORMAT "\n",
858 (* child_setup) (user_data);
860 #ifdef DBUS_BUILD_TESTS
861 max_open = sysconf (_SC_OPEN_MAX);
863 for (i = 3; i < max_open; i++)
867 if (i == child_err_report_fd)
870 retval = fcntl (i, F_GETFD);
872 if (retval != -1 && !(retval & FD_CLOEXEC))
873 _dbus_warn ("Fd %d did not have the close-on-exec flag set!\n", i);
877 execv (argv[0], argv);
880 write_err_and_exit (child_err_report_fd,
885 check_babysit_events (pid_t grandchild_pid,
894 ret = waitpid (grandchild_pid, &status, WNOHANG);
895 /* The man page says EINTR can't happen with WNOHANG,
896 * but there are reports of it (maybe only with valgrind?)
899 while (ret < 0 && errno == EINTR);
903 _dbus_verbose ("no child exited\n");
905 ; /* no child exited */
909 /* This isn't supposed to happen. */
910 _dbus_warn ("unexpected waitpid() failure in check_babysit_events(): %s\n",
911 _dbus_strerror (errno));
914 else if (ret == grandchild_pid)
917 _dbus_verbose ("reaped child pid %ld\n", (long) ret);
919 write_status_and_exit (parent_pipe, status);
923 _dbus_warn ("waitpid() reaped pid %d that we've never heard of\n",
928 if (revents & _DBUS_POLLIN)
930 _dbus_verbose ("babysitter got POLLIN from parent pipe\n");
933 if (revents & (_DBUS_POLLERR | _DBUS_POLLHUP))
935 /* Parent is gone, so we just exit */
936 _dbus_verbose ("babysitter got POLLERR or POLLHUP from parent\n");
941 static int babysit_sigchld_pipe = -1;
944 babysit_signal_handler (int signo)
948 write (babysit_sigchld_pipe, &b, 1);
954 babysit (pid_t grandchild_pid,
959 /* We don't exec, so we keep parent state, such as the pid that
960 * _dbus_verbose() uses. Reset the pid here.
962 _dbus_verbose_reset ();
964 /* I thought SIGCHLD would just wake up the poll, but
965 * that didn't seem to work, so added this pipe.
966 * Probably the pipe is more likely to work on busted
967 * operating systems anyhow.
969 if (pipe (sigchld_pipe) < 0)
971 _dbus_warn ("Not enough file descriptors to create pipe in babysitter process\n");
975 babysit_sigchld_pipe = sigchld_pipe[WRITE_END];
977 _dbus_set_signal_handler (SIGCHLD, babysit_signal_handler);
979 write_pid (parent_pipe, grandchild_pid);
981 check_babysit_events (grandchild_pid, parent_pipe, 0);
987 pfds[0].fd = parent_pipe;
988 pfds[0].events = _DBUS_POLLIN;
991 pfds[1].fd = sigchld_pipe[READ_END];
992 pfds[1].events = _DBUS_POLLIN;
995 _dbus_poll (pfds, _DBUS_N_ELEMENTS (pfds), -1);
997 if (pfds[0].revents != 0)
999 check_babysit_events (grandchild_pid, parent_pipe, pfds[0].revents);
1001 else if (pfds[1].revents & _DBUS_POLLIN)
1004 read (sigchld_pipe[READ_END], &b, 1);
1005 /* do waitpid check */
1006 check_babysit_events (grandchild_pid, parent_pipe, 0);
1014 * Spawns a new process. The executable name and argv[0]
1015 * are the same, both are provided in argv[0]. The child_setup
1016 * function is passed the given user_data and is run in the child
1017 * just before calling exec().
1019 * Also creates a "babysitter" which tracks the status of the
1020 * child process, advising the parent if the child exits.
1021 * If the spawn fails, no babysitter is created.
1022 * If sitter_p is #NULL, no babysitter is kept.
1024 * @param sitter_p return location for babysitter or #NULL
1025 * @param argv the executable and arguments
1026 * @param env the environment (not used on unix yet)
1027 * @param child_setup function to call in child pre-exec()
1028 * @param user_data user data for setup function
1029 * @param error error object to be filled in if function fails
1030 * @returns #TRUE on success, #FALSE if error is filled in
1033 _dbus_spawn_async_with_babysitter (DBusBabysitter **sitter_p,
1036 DBusSpawnChildSetupFunc child_setup,
1040 DBusBabysitter *sitter;
1041 int child_err_report_pipe[2] = { -1, -1 };
1042 int babysitter_pipe[2] = { -1, -1 };
1045 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1050 sitter = _dbus_babysitter_new ();
1053 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
1057 sitter->executable = _dbus_strdup (argv[0]);
1058 if (sitter->executable == NULL)
1060 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
1061 goto cleanup_and_fail;
1064 if (!make_pipe (child_err_report_pipe, error))
1065 goto cleanup_and_fail;
1067 _dbus_fd_set_close_on_exec (child_err_report_pipe[READ_END]);
1068 _dbus_fd_set_close_on_exec (child_err_report_pipe[WRITE_END]);
1070 if (!_dbus_full_duplex_pipe (&babysitter_pipe[0], &babysitter_pipe[1], TRUE, error))
1071 goto cleanup_and_fail;
1073 _dbus_fd_set_close_on_exec (babysitter_pipe[0]);
1074 _dbus_fd_set_close_on_exec (babysitter_pipe[1]);
1076 /* Setting up the babysitter is only useful in the parent,
1077 * but we don't want to run out of memory and fail
1078 * after we've already forked, since then we'd leak
1079 * child processes everywhere.
1081 sitter->error_watch = _dbus_watch_new (child_err_report_pipe[READ_END],
1082 DBUS_WATCH_READABLE,
1083 TRUE, handle_watch, sitter, NULL);
1084 if (sitter->error_watch == NULL)
1086 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
1087 goto cleanup_and_fail;
1090 if (!_dbus_watch_list_add_watch (sitter->watches, sitter->error_watch))
1092 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
1093 goto cleanup_and_fail;
1096 sitter->sitter_watch = _dbus_watch_new (babysitter_pipe[0],
1097 DBUS_WATCH_READABLE,
1098 TRUE, handle_watch, sitter, NULL);
1099 if (sitter->sitter_watch == NULL)
1101 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
1102 goto cleanup_and_fail;
1105 if (!_dbus_watch_list_add_watch (sitter->watches, sitter->sitter_watch))
1107 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
1108 goto cleanup_and_fail;
1111 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1117 dbus_set_error (error,
1118 DBUS_ERROR_SPAWN_FORK_FAILED,
1119 "Failed to fork (%s)",
1120 _dbus_strerror (errno));
1121 goto cleanup_and_fail;
1125 /* Immediate child, this is the babysitter process. */
1128 /* Be sure we crash if the parent exits
1129 * and we write to the err_report_pipe
1131 signal (SIGPIPE, SIG_DFL);
1133 /* Close the parent's end of the pipes. */
1134 close_and_invalidate (&child_err_report_pipe[READ_END]);
1135 close_and_invalidate (&babysitter_pipe[0]);
1137 /* Create the child that will exec () */
1138 grandchild_pid = fork ();
1140 if (grandchild_pid < 0)
1142 write_err_and_exit (babysitter_pipe[1],
1144 _dbus_assert_not_reached ("Got to code after write_err_and_exit()");
1146 else if (grandchild_pid == 0)
1148 do_exec (child_err_report_pipe[WRITE_END],
1150 child_setup, user_data);
1151 _dbus_assert_not_reached ("Got to code after exec() - should have exited on error");
1155 babysit (grandchild_pid, babysitter_pipe[1]);
1156 _dbus_assert_not_reached ("Got to code after babysit()");
1161 /* Close the uncared-about ends of the pipes */
1162 close_and_invalidate (&child_err_report_pipe[WRITE_END]);
1163 close_and_invalidate (&babysitter_pipe[1]);
1165 sitter->socket_to_babysitter = babysitter_pipe[0];
1166 babysitter_pipe[0] = -1;
1168 sitter->error_pipe_from_child = child_err_report_pipe[READ_END];
1169 child_err_report_pipe[READ_END] = -1;
1171 sitter->sitter_pid = pid;
1173 if (sitter_p != NULL)
1176 _dbus_babysitter_unref (sitter);
1178 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1185 _DBUS_ASSERT_ERROR_IS_SET (error);
1187 close_and_invalidate (&child_err_report_pipe[READ_END]);
1188 close_and_invalidate (&child_err_report_pipe[WRITE_END]);
1189 close_and_invalidate (&babysitter_pipe[0]);
1190 close_and_invalidate (&babysitter_pipe[1]);
1193 _dbus_babysitter_unref (sitter);
1200 #ifdef DBUS_BUILD_TESTS
1203 _dbus_babysitter_block_for_child_exit (DBusBabysitter *sitter)
1205 while (LIVE_CHILDREN (sitter))
1206 babysitter_iteration (sitter, TRUE);
1210 check_spawn_nonexistent (void *data)
1212 char *argv[4] = { NULL, NULL, NULL, NULL };
1213 DBusBabysitter *sitter;
1218 dbus_error_init (&error);
1220 /*** Test launching nonexistent binary */
1222 argv[0] = "/this/does/not/exist/32542sdgafgafdg";
1223 if (_dbus_spawn_async_with_babysitter (&sitter, argv,
1227 _dbus_babysitter_block_for_child_exit (sitter);
1228 _dbus_babysitter_set_child_exit_error (sitter, &error);
1232 _dbus_babysitter_unref (sitter);
1234 if (!dbus_error_is_set (&error))
1236 _dbus_warn ("Did not get an error launching nonexistent executable\n");
1240 if (!(dbus_error_has_name (&error, DBUS_ERROR_NO_MEMORY) ||
1241 dbus_error_has_name (&error, DBUS_ERROR_SPAWN_EXEC_FAILED)))
1243 _dbus_warn ("Not expecting error when launching nonexistent executable: %s: %s\n",
1244 error.name, error.message);
1245 dbus_error_free (&error);
1249 dbus_error_free (&error);
1255 check_spawn_segfault (void *data)
1257 char *argv[4] = { NULL, NULL, NULL, NULL };
1258 DBusBabysitter *sitter;
1263 dbus_error_init (&error);
1265 /*** Test launching segfault binary */
1267 argv[0] = TEST_SEGFAULT_BINARY;
1268 if (_dbus_spawn_async_with_babysitter (&sitter, argv,
1272 _dbus_babysitter_block_for_child_exit (sitter);
1273 _dbus_babysitter_set_child_exit_error (sitter, &error);
1277 _dbus_babysitter_unref (sitter);
1279 if (!dbus_error_is_set (&error))
1281 _dbus_warn ("Did not get an error launching segfaulting binary\n");
1285 if (!(dbus_error_has_name (&error, DBUS_ERROR_NO_MEMORY) ||
1286 dbus_error_has_name (&error, DBUS_ERROR_SPAWN_CHILD_SIGNALED)))
1288 _dbus_warn ("Not expecting error when launching segfaulting executable: %s: %s\n",
1289 error.name, error.message);
1290 dbus_error_free (&error);
1294 dbus_error_free (&error);
1300 check_spawn_exit (void *data)
1302 char *argv[4] = { NULL, NULL, NULL, NULL };
1303 DBusBabysitter *sitter;
1308 dbus_error_init (&error);
1310 /*** Test launching exit failure binary */
1312 argv[0] = TEST_EXIT_BINARY;
1313 if (_dbus_spawn_async_with_babysitter (&sitter, argv,
1317 _dbus_babysitter_block_for_child_exit (sitter);
1318 _dbus_babysitter_set_child_exit_error (sitter, &error);
1322 _dbus_babysitter_unref (sitter);
1324 if (!dbus_error_is_set (&error))
1326 _dbus_warn ("Did not get an error launching binary that exited with failure code\n");
1330 if (!(dbus_error_has_name (&error, DBUS_ERROR_NO_MEMORY) ||
1331 dbus_error_has_name (&error, DBUS_ERROR_SPAWN_CHILD_EXITED)))
1333 _dbus_warn ("Not expecting error when launching exiting executable: %s: %s\n",
1334 error.name, error.message);
1335 dbus_error_free (&error);
1339 dbus_error_free (&error);
1345 check_spawn_and_kill (void *data)
1347 char *argv[4] = { NULL, NULL, NULL, NULL };
1348 DBusBabysitter *sitter;
1353 dbus_error_init (&error);
1355 /*** Test launching sleeping binary then killing it */
1357 argv[0] = TEST_SLEEP_FOREVER_BINARY;
1358 if (_dbus_spawn_async_with_babysitter (&sitter, argv,
1362 _dbus_babysitter_kill_child (sitter);
1364 _dbus_babysitter_block_for_child_exit (sitter);
1366 _dbus_babysitter_set_child_exit_error (sitter, &error);
1370 _dbus_babysitter_unref (sitter);
1372 if (!dbus_error_is_set (&error))
1374 _dbus_warn ("Did not get an error after killing spawned binary\n");
1378 if (!(dbus_error_has_name (&error, DBUS_ERROR_NO_MEMORY) ||
1379 dbus_error_has_name (&error, DBUS_ERROR_SPAWN_CHILD_SIGNALED)))
1381 _dbus_warn ("Not expecting error when killing executable: %s: %s\n",
1382 error.name, error.message);
1383 dbus_error_free (&error);
1387 dbus_error_free (&error);
1393 _dbus_spawn_test (const char *test_data_dir)
1395 if (!_dbus_test_oom_handling ("spawn_nonexistent",
1396 check_spawn_nonexistent,
1400 if (!_dbus_test_oom_handling ("spawn_segfault",
1401 check_spawn_segfault,
1405 if (!_dbus_test_oom_handling ("spawn_exit",
1410 if (!_dbus_test_oom_handling ("spawn_and_kill",
1411 check_spawn_and_kill,