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.
256 * @param sitter the babysitter
259 _dbus_babysitter_unref (DBusBabysitter *sitter)
261 _dbus_assert (sitter != NULL);
262 _dbus_assert (sitter->refcount > 0);
264 sitter->refcount -= 1;
265 if (sitter->refcount == 0)
267 if (sitter->socket_to_babysitter >= 0)
269 close (sitter->socket_to_babysitter);
270 sitter->socket_to_babysitter = -1;
273 if (sitter->error_pipe_from_child >= 0)
275 close (sitter->error_pipe_from_child);
276 sitter->error_pipe_from_child = -1;
279 if (sitter->sitter_pid != -1)
284 /* Reap the babysitter */
286 ret = waitpid (sitter->sitter_pid, &status, 0);
291 else if (errno == ECHILD)
292 _dbus_warn ("Babysitter process not available to be reaped; should not happen\n");
294 _dbus_warn ("Unexpected error %d in waitpid() for babysitter: %s\n",
295 errno, _dbus_strerror (errno));
299 _dbus_verbose ("Reaped %ld, waiting for babysitter %ld\n",
300 (long) ret, (long) sitter->sitter_pid);
302 if (WIFEXITED (sitter->status))
303 _dbus_verbose ("Babysitter exited with status %d\n",
304 WEXITSTATUS (sitter->status));
305 else if (WIFSIGNALED (sitter->status))
306 _dbus_verbose ("Babysitter received signal %d\n",
307 WTERMSIG (sitter->status));
309 _dbus_verbose ("Babysitter exited abnormally\n");
312 sitter->sitter_pid = -1;
315 if (sitter->error_watch)
317 _dbus_watch_invalidate (sitter->error_watch);
318 _dbus_watch_unref (sitter->error_watch);
319 sitter->error_watch = NULL;
322 if (sitter->sitter_watch)
324 _dbus_watch_invalidate (sitter->sitter_watch);
325 _dbus_watch_unref (sitter->sitter_watch);
326 sitter->sitter_watch = NULL;
330 _dbus_watch_list_free (sitter->watches);
332 dbus_free (sitter->executable);
339 read_data (DBusBabysitter *sitter,
347 dbus_error_init (&error);
349 r = read_ints (fd, &what, 1, &got, &error);
353 case READ_STATUS_ERROR:
354 _dbus_warn ("Failed to read data from fd %d: %s\n", fd, error.message);
355 dbus_error_free (&error);
358 case READ_STATUS_EOF:
370 case CHILD_FORK_FAILED:
371 case CHILD_EXEC_FAILED:
375 r = read_ints (fd, &arg, 1, &got, &error);
379 case READ_STATUS_ERROR:
380 _dbus_warn ("Failed to read arg from fd %d: %s\n", fd, error.message);
381 dbus_error_free (&error);
383 case READ_STATUS_EOF:
391 if (what == CHILD_EXITED)
393 sitter->have_child_status = TRUE;
394 sitter->status = arg;
395 _dbus_verbose ("recorded child status exited = %d signaled = %d exitstatus = %d termsig = %d\n",
396 WIFEXITED (sitter->status), WIFSIGNALED (sitter->status),
397 WEXITSTATUS (sitter->status), WTERMSIG (sitter->status));
399 else if (what == CHILD_FORK_FAILED)
401 sitter->have_fork_errnum = TRUE;
402 sitter->errnum = arg;
403 _dbus_verbose ("recorded fork errnum %d\n", sitter->errnum);
405 else if (what == CHILD_EXEC_FAILED)
407 sitter->have_exec_errnum = TRUE;
408 sitter->errnum = arg;
409 _dbus_verbose ("recorded exec errnum %d\n", sitter->errnum);
418 r = read_pid (fd, &pid, &error);
422 case READ_STATUS_ERROR:
423 _dbus_warn ("Failed to read PID from fd %d: %s\n", fd, error.message);
424 dbus_error_free (&error);
426 case READ_STATUS_EOF:
432 sitter->grandchild_pid = pid;
434 _dbus_verbose ("recorded grandchild pid %d\n", sitter->grandchild_pid);
438 _dbus_warn ("Unknown message received from babysitter process\n");
447 close_socket_to_babysitter (DBusBabysitter *sitter)
449 _dbus_verbose ("Closing babysitter\n");
450 close (sitter->socket_to_babysitter);
451 sitter->socket_to_babysitter = -1;
455 close_error_pipe_from_child (DBusBabysitter *sitter)
457 _dbus_verbose ("Closing child error\n");
458 close (sitter->error_pipe_from_child);
459 sitter->error_pipe_from_child = -1;
463 handle_babysitter_socket (DBusBabysitter *sitter,
466 /* Even if we have POLLHUP, we want to keep reading
467 * data until POLLIN goes away; so this function only
468 * looks at HUP/ERR if no IN is set.
470 if (revents & _DBUS_POLLIN)
472 _dbus_verbose ("Reading data from babysitter\n");
473 if (read_data (sitter, sitter->socket_to_babysitter) != READ_STATUS_OK)
474 close_socket_to_babysitter (sitter);
476 else if (revents & (_DBUS_POLLERR | _DBUS_POLLHUP))
478 close_socket_to_babysitter (sitter);
483 handle_error_pipe (DBusBabysitter *sitter,
486 if (revents & _DBUS_POLLIN)
488 _dbus_verbose ("Reading data from child error\n");
489 if (read_data (sitter, sitter->error_pipe_from_child) != READ_STATUS_OK)
490 close_error_pipe_from_child (sitter);
492 else if (revents & (_DBUS_POLLERR | _DBUS_POLLHUP))
494 close_error_pipe_from_child (sitter);
498 /* returns whether there were any poll events handled */
500 babysitter_iteration (DBusBabysitter *sitter,
505 dbus_bool_t descriptors_ready;
507 descriptors_ready = FALSE;
511 if (sitter->error_pipe_from_child >= 0)
513 fds[i].fd = sitter->error_pipe_from_child;
514 fds[i].events = _DBUS_POLLIN;
519 if (sitter->socket_to_babysitter >= 0)
521 fds[i].fd = sitter->socket_to_babysitter;
522 fds[i].events = _DBUS_POLLIN;
531 ret = _dbus_poll (fds, i, 0);
532 if (ret == 0 && block)
533 ret = _dbus_poll (fds, i, -1);
537 descriptors_ready = TRUE;
542 if (fds[i].fd == sitter->error_pipe_from_child)
543 handle_error_pipe (sitter, fds[i].revents);
544 else if (fds[i].fd == sitter->socket_to_babysitter)
545 handle_babysitter_socket (sitter, fds[i].revents);
550 return descriptors_ready;
554 * Macro returns #TRUE if the babysitter still has live sockets open to the
555 * babysitter child or the grandchild.
557 #define LIVE_CHILDREN(sitter) ((sitter)->socket_to_babysitter >= 0 || (sitter)->error_pipe_from_child >= 0)
560 * Blocks until the babysitter process gives us the PID of the spawned grandchild,
561 * then kills the spawned grandchild.
563 * @param sitter the babysitter object
566 _dbus_babysitter_kill_child (DBusBabysitter *sitter)
568 /* be sure we have the PID of the child */
569 while (LIVE_CHILDREN (sitter) &&
570 sitter->grandchild_pid == -1)
571 babysitter_iteration (sitter, TRUE);
573 _dbus_verbose ("Got child PID %ld for killing\n",
574 (long) sitter->grandchild_pid);
576 if (sitter->grandchild_pid == -1)
577 return; /* child is already dead, or we're so hosed we'll never recover */
579 kill (sitter->grandchild_pid, SIGKILL);
583 * Checks whether the child has exited, without blocking.
585 * @param sitter the babysitter
588 _dbus_babysitter_get_child_exited (DBusBabysitter *sitter)
591 /* Be sure we're up-to-date */
592 while (LIVE_CHILDREN (sitter) &&
593 babysitter_iteration (sitter, FALSE))
596 /* We will have exited the babysitter when the child has exited */
597 return sitter->socket_to_babysitter < 0;
601 * Sets the #DBusError with an explanation of why the spawned
602 * child process exited (on a signal, or whatever). If
603 * the child process has not exited, does nothing (error
604 * will remain unset).
606 * @param sitter the babysitter
607 * @param error an error to fill in
610 _dbus_babysitter_set_child_exit_error (DBusBabysitter *sitter,
613 if (!_dbus_babysitter_get_child_exited (sitter))
616 /* Note that if exec fails, we will also get a child status
617 * from the babysitter saying the child exited,
618 * so we need to give priority to the exec error
620 if (sitter->have_exec_errnum)
622 dbus_set_error (error, DBUS_ERROR_SPAWN_EXEC_FAILED,
623 "Failed to execute program %s: %s",
624 sitter->executable, _dbus_strerror (sitter->errnum));
626 else if (sitter->have_fork_errnum)
628 dbus_set_error (error, DBUS_ERROR_NO_MEMORY,
629 "Failed to fork a new process %s: %s",
630 sitter->executable, _dbus_strerror (sitter->errnum));
632 else if (sitter->have_child_status)
634 if (WIFEXITED (sitter->status))
635 dbus_set_error (error, DBUS_ERROR_SPAWN_CHILD_EXITED,
636 "Process %s exited with status %d",
637 sitter->executable, WEXITSTATUS (sitter->status));
638 else if (WIFSIGNALED (sitter->status))
639 dbus_set_error (error, DBUS_ERROR_SPAWN_CHILD_SIGNALED,
640 "Process %s received signal %d",
641 sitter->executable, WTERMSIG (sitter->status));
643 dbus_set_error (error, DBUS_ERROR_FAILED,
644 "Process %s exited abnormally",
649 dbus_set_error (error, DBUS_ERROR_FAILED,
650 "Process %s exited, reason unknown",
656 * Sets watch functions to notify us when the
657 * babysitter object needs to read/write file descriptors.
659 * @param sitter the babysitter
660 * @param add_function function to begin monitoring a new descriptor.
661 * @param remove_function function to stop monitoring a descriptor.
662 * @param toggled_function function to notify when the watch is enabled/disabled
663 * @param data data to pass to add_function and remove_function.
664 * @param free_data_function function to be called to free the data.
665 * @returns #FALSE on failure (no memory)
668 _dbus_babysitter_set_watch_functions (DBusBabysitter *sitter,
669 DBusAddWatchFunction add_function,
670 DBusRemoveWatchFunction remove_function,
671 DBusWatchToggledFunction toggled_function,
673 DBusFreeFunction free_data_function)
675 return _dbus_watch_list_set_functions (sitter->watches,
684 handle_watch (DBusWatch *watch,
685 unsigned int condition,
688 DBusBabysitter *sitter = data;
693 if (condition & DBUS_WATCH_READABLE)
694 revents |= _DBUS_POLLIN;
695 if (condition & DBUS_WATCH_ERROR)
696 revents |= _DBUS_POLLERR;
697 if (condition & DBUS_WATCH_HANGUP)
698 revents |= _DBUS_POLLHUP;
700 fd = dbus_watch_get_fd (watch);
702 if (fd == sitter->error_pipe_from_child)
703 handle_error_pipe (sitter, revents);
704 else if (fd == sitter->socket_to_babysitter)
705 handle_babysitter_socket (sitter, revents);
707 while (LIVE_CHILDREN (sitter) &&
708 babysitter_iteration (sitter, FALSE))
714 /** Helps remember which end of the pipe is which */
716 /** Helps remember which end of the pipe is which */
720 /* Avoids a danger in threaded situations (calling close()
721 * on a file descriptor twice, and another thread has
722 * re-opened it since the first close)
725 close_and_invalidate (int *fd)
744 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
748 dbus_set_error (error,
749 DBUS_ERROR_SPAWN_FAILED,
750 "Failed to create pipe for communicating with child process (%s)",
751 _dbus_strerror (errno));
759 do_write (int fd, const void *buf, size_t count)
761 size_t bytes_written;
768 ret = write (fd, ((const char*)buf) + bytes_written, count - bytes_written);
776 _dbus_warn ("Failed to write data to pipe!\n");
777 exit (1); /* give up, we suck */
781 bytes_written += ret;
783 if (bytes_written < count)
788 write_err_and_exit (int fd, int msg)
792 do_write (fd, &msg, sizeof (msg));
793 do_write (fd, &en, sizeof (en));
799 write_pid (int fd, pid_t pid)
803 do_write (fd, &msg, sizeof (msg));
804 do_write (fd, &pid, sizeof (pid));
808 write_status_and_exit (int fd, int status)
810 int msg = CHILD_EXITED;
812 do_write (fd, &msg, sizeof (msg));
813 do_write (fd, &status, sizeof (status));
819 do_exec (int child_err_report_fd,
821 DBusSpawnChildSetupFunc child_setup,
824 #ifdef DBUS_BUILD_TESTS
828 _dbus_verbose_reset ();
829 _dbus_verbose ("Child process has PID %lu\n",
833 (* child_setup) (user_data);
835 #ifdef DBUS_BUILD_TESTS
836 max_open = sysconf (_SC_OPEN_MAX);
838 for (i = 3; i < max_open; i++)
842 if (i == child_err_report_fd)
845 retval = fcntl (i, F_GETFD);
847 if (retval != -1 && !(retval & FD_CLOEXEC))
848 _dbus_warn ("Fd %d did not have the close-on-exec flag set!\n", i);
852 execv (argv[0], argv);
855 write_err_and_exit (child_err_report_fd,
860 check_babysit_events (pid_t grandchild_pid,
867 ret = waitpid (grandchild_pid, &status, WNOHANG);
871 _dbus_verbose ("no child exited\n");
873 ; /* no child exited */
877 /* This isn't supposed to happen. */
878 _dbus_warn ("unexpected waitpid() failure in check_babysit_events(): %s\n",
879 _dbus_strerror (errno));
882 else if (ret == grandchild_pid)
885 _dbus_verbose ("reaped child pid %ld\n", (long) ret);
887 write_status_and_exit (parent_pipe, status);
891 _dbus_warn ("waitpid() reaped pid %d that we've never heard of\n",
896 if (revents & _DBUS_POLLIN)
898 _dbus_verbose ("babysitter got POLLIN from parent pipe\n");
901 if (revents & (_DBUS_POLLERR | _DBUS_POLLHUP))
903 /* Parent is gone, so we just exit */
904 _dbus_verbose ("babysitter got POLLERR or POLLHUP from parent\n");
909 static int babysit_sigchld_pipe = -1;
912 babysit_signal_handler (int signo)
916 write (babysit_sigchld_pipe, &b, 1);
922 babysit (pid_t grandchild_pid,
927 /* We don't exec, so we keep parent state, such as the pid that
928 * _dbus_verbose() uses. Reset the pid here.
930 _dbus_verbose_reset ();
932 /* I thought SIGCHLD would just wake up the poll, but
933 * that didn't seem to work, so added this pipe.
934 * Probably the pipe is more likely to work on busted
935 * operating systems anyhow.
937 if (pipe (sigchld_pipe) < 0)
939 _dbus_warn ("Not enough file descriptors to create pipe in babysitter process\n");
943 babysit_sigchld_pipe = sigchld_pipe[WRITE_END];
945 _dbus_set_signal_handler (SIGCHLD, babysit_signal_handler);
947 write_pid (parent_pipe, grandchild_pid);
949 check_babysit_events (grandchild_pid, parent_pipe, 0);
955 pfds[0].fd = parent_pipe;
956 pfds[0].events = _DBUS_POLLIN;
959 pfds[1].fd = sigchld_pipe[READ_END];
960 pfds[1].events = _DBUS_POLLIN;
963 _dbus_poll (pfds, _DBUS_N_ELEMENTS (pfds), -1);
965 if (pfds[0].revents != 0)
967 check_babysit_events (grandchild_pid, parent_pipe, pfds[0].revents);
969 else if (pfds[1].revents & _DBUS_POLLIN)
972 read (sigchld_pipe[READ_END], &b, 1);
973 /* do waitpid check */
974 check_babysit_events (grandchild_pid, parent_pipe, 0);
982 * Spawns a new process. The executable name and argv[0]
983 * are the same, both are provided in argv[0]. The child_setup
984 * function is passed the given user_data and is run in the child
985 * just before calling exec().
987 * Also creates a "babysitter" which tracks the status of the
988 * child process, advising the parent if the child exits.
989 * If the spawn fails, no babysitter is created.
990 * If sitter_p is #NULL, no babysitter is kept.
992 * @param sitter_p return location for babysitter or #NULL
993 * @param argv the executable and arguments
994 * @param child_setup function to call in child pre-exec()
995 * @param user_data user data for setup function
996 * @param error error object to be filled in if function fails
997 * @returns #TRUE on success, #FALSE if error is filled in
1000 _dbus_spawn_async_with_babysitter (DBusBabysitter **sitter_p,
1002 DBusSpawnChildSetupFunc child_setup,
1006 DBusBabysitter *sitter;
1007 int child_err_report_pipe[2] = { -1, -1 };
1008 int babysitter_pipe[2] = { -1, -1 };
1011 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1016 sitter = _dbus_babysitter_new ();
1019 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
1023 sitter->executable = _dbus_strdup (argv[0]);
1024 if (sitter->executable == NULL)
1026 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
1027 goto cleanup_and_fail;
1030 if (!make_pipe (child_err_report_pipe, error))
1031 goto cleanup_and_fail;
1033 _dbus_fd_set_close_on_exec (child_err_report_pipe[READ_END]);
1035 if (!_dbus_full_duplex_pipe (&babysitter_pipe[0], &babysitter_pipe[1], TRUE, error))
1036 goto cleanup_and_fail;
1038 _dbus_fd_set_close_on_exec (babysitter_pipe[0]);
1039 _dbus_fd_set_close_on_exec (babysitter_pipe[1]);
1041 /* Setting up the babysitter is only useful in the parent,
1042 * but we don't want to run out of memory and fail
1043 * after we've already forked, since then we'd leak
1044 * child processes everywhere.
1046 sitter->error_watch = _dbus_watch_new (child_err_report_pipe[READ_END],
1047 DBUS_WATCH_READABLE,
1048 TRUE, handle_watch, sitter, NULL);
1049 if (sitter->error_watch == NULL)
1051 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
1052 goto cleanup_and_fail;
1055 if (!_dbus_watch_list_add_watch (sitter->watches, sitter->error_watch))
1057 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
1058 goto cleanup_and_fail;
1061 sitter->sitter_watch = _dbus_watch_new (babysitter_pipe[0],
1062 DBUS_WATCH_READABLE,
1063 TRUE, handle_watch, sitter, NULL);
1064 if (sitter->sitter_watch == NULL)
1066 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
1067 goto cleanup_and_fail;
1070 if (!_dbus_watch_list_add_watch (sitter->watches, sitter->sitter_watch))
1072 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
1073 goto cleanup_and_fail;
1076 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1082 dbus_set_error (error,
1083 DBUS_ERROR_SPAWN_FORK_FAILED,
1084 "Failed to fork (%s)",
1085 _dbus_strerror (errno));
1086 goto cleanup_and_fail;
1090 /* Immediate child, this is the babysitter process. */
1093 /* Be sure we crash if the parent exits
1094 * and we write to the err_report_pipe
1096 signal (SIGPIPE, SIG_DFL);
1098 /* Close the parent's end of the pipes. */
1099 close_and_invalidate (&child_err_report_pipe[READ_END]);
1100 close_and_invalidate (&babysitter_pipe[0]);
1102 /* Create the child that will exec () */
1103 grandchild_pid = fork ();
1105 if (grandchild_pid < 0)
1107 write_err_and_exit (babysitter_pipe[1],
1109 _dbus_assert_not_reached ("Got to code after write_err_and_exit()");
1111 else if (grandchild_pid == 0)
1113 do_exec (child_err_report_pipe[WRITE_END],
1115 child_setup, user_data);
1116 _dbus_assert_not_reached ("Got to code after exec() - should have exited on error");
1120 babysit (grandchild_pid, babysitter_pipe[1]);
1121 _dbus_assert_not_reached ("Got to code after babysit()");
1126 /* Close the uncared-about ends of the pipes */
1127 close_and_invalidate (&child_err_report_pipe[WRITE_END]);
1128 close_and_invalidate (&babysitter_pipe[1]);
1130 sitter->socket_to_babysitter = babysitter_pipe[0];
1131 babysitter_pipe[0] = -1;
1133 sitter->error_pipe_from_child = child_err_report_pipe[READ_END];
1134 child_err_report_pipe[READ_END] = -1;
1136 sitter->sitter_pid = pid;
1138 if (sitter_p != NULL)
1141 _dbus_babysitter_unref (sitter);
1143 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1150 _DBUS_ASSERT_ERROR_IS_SET (error);
1152 close_and_invalidate (&child_err_report_pipe[READ_END]);
1153 close_and_invalidate (&child_err_report_pipe[WRITE_END]);
1154 close_and_invalidate (&babysitter_pipe[0]);
1155 close_and_invalidate (&babysitter_pipe[1]);
1158 _dbus_babysitter_unref (sitter);
1165 #ifdef DBUS_BUILD_TESTS
1168 _dbus_babysitter_block_for_child_exit (DBusBabysitter *sitter)
1170 while (LIVE_CHILDREN (sitter))
1171 babysitter_iteration (sitter, TRUE);
1175 check_spawn_nonexistent (void *data)
1177 char *argv[4] = { NULL, NULL, NULL, NULL };
1178 DBusBabysitter *sitter;
1183 dbus_error_init (&error);
1185 /*** Test launching nonexistent binary */
1187 argv[0] = "/this/does/not/exist/32542sdgafgafdg";
1188 if (_dbus_spawn_async_with_babysitter (&sitter, argv,
1192 _dbus_babysitter_block_for_child_exit (sitter);
1193 _dbus_babysitter_set_child_exit_error (sitter, &error);
1197 _dbus_babysitter_unref (sitter);
1199 if (!dbus_error_is_set (&error))
1201 _dbus_warn ("Did not get an error launching nonexistent executable\n");
1205 if (!(dbus_error_has_name (&error, DBUS_ERROR_NO_MEMORY) ||
1206 dbus_error_has_name (&error, DBUS_ERROR_SPAWN_EXEC_FAILED)))
1208 _dbus_warn ("Not expecting error when launching nonexistent executable: %s: %s\n",
1209 error.name, error.message);
1210 dbus_error_free (&error);
1214 dbus_error_free (&error);
1220 check_spawn_segfault (void *data)
1222 char *argv[4] = { NULL, NULL, NULL, NULL };
1223 DBusBabysitter *sitter;
1228 dbus_error_init (&error);
1230 /*** Test launching segfault binary */
1232 argv[0] = TEST_SEGFAULT_BINARY;
1233 if (_dbus_spawn_async_with_babysitter (&sitter, argv,
1237 _dbus_babysitter_block_for_child_exit (sitter);
1238 _dbus_babysitter_set_child_exit_error (sitter, &error);
1242 _dbus_babysitter_unref (sitter);
1244 if (!dbus_error_is_set (&error))
1246 _dbus_warn ("Did not get an error launching segfaulting binary\n");
1250 if (!(dbus_error_has_name (&error, DBUS_ERROR_NO_MEMORY) ||
1251 dbus_error_has_name (&error, DBUS_ERROR_SPAWN_CHILD_SIGNALED)))
1253 _dbus_warn ("Not expecting error when launching segfaulting executable: %s: %s\n",
1254 error.name, error.message);
1255 dbus_error_free (&error);
1259 dbus_error_free (&error);
1265 check_spawn_exit (void *data)
1267 char *argv[4] = { NULL, NULL, NULL, NULL };
1268 DBusBabysitter *sitter;
1273 dbus_error_init (&error);
1275 /*** Test launching exit failure binary */
1277 argv[0] = TEST_EXIT_BINARY;
1278 if (_dbus_spawn_async_with_babysitter (&sitter, argv,
1282 _dbus_babysitter_block_for_child_exit (sitter);
1283 _dbus_babysitter_set_child_exit_error (sitter, &error);
1287 _dbus_babysitter_unref (sitter);
1289 if (!dbus_error_is_set (&error))
1291 _dbus_warn ("Did not get an error launching binary that exited with failure code\n");
1295 if (!(dbus_error_has_name (&error, DBUS_ERROR_NO_MEMORY) ||
1296 dbus_error_has_name (&error, DBUS_ERROR_SPAWN_CHILD_EXITED)))
1298 _dbus_warn ("Not expecting error when launching exiting executable: %s: %s\n",
1299 error.name, error.message);
1300 dbus_error_free (&error);
1304 dbus_error_free (&error);
1310 check_spawn_and_kill (void *data)
1312 char *argv[4] = { NULL, NULL, NULL, NULL };
1313 DBusBabysitter *sitter;
1318 dbus_error_init (&error);
1320 /*** Test launching sleeping binary then killing it */
1322 argv[0] = TEST_SLEEP_FOREVER_BINARY;
1323 if (_dbus_spawn_async_with_babysitter (&sitter, argv,
1327 _dbus_babysitter_kill_child (sitter);
1329 _dbus_babysitter_block_for_child_exit (sitter);
1331 _dbus_babysitter_set_child_exit_error (sitter, &error);
1335 _dbus_babysitter_unref (sitter);
1337 if (!dbus_error_is_set (&error))
1339 _dbus_warn ("Did not get an error after killing spawned binary\n");
1343 if (!(dbus_error_has_name (&error, DBUS_ERROR_NO_MEMORY) ||
1344 dbus_error_has_name (&error, DBUS_ERROR_SPAWN_CHILD_SIGNALED)))
1346 _dbus_warn ("Not expecting error when killing executable: %s: %s\n",
1347 error.name, error.message);
1348 dbus_error_free (&error);
1352 dbus_error_free (&error);
1358 _dbus_spawn_test (const char *test_data_dir)
1360 if (!_dbus_test_oom_handling ("spawn_nonexistent",
1361 check_spawn_nonexistent,
1365 if (!_dbus_test_oom_handling ("spawn_segfault",
1366 check_spawn_segfault,
1370 if (!_dbus_test_oom_handling ("spawn_exit",
1375 if (!_dbus_test_oom_handling ("spawn_and_kill",
1376 check_spawn_and_kill,