1 /* -*- mode: C; c-file-style: "gnu" -*- */
2 /* dbus-spawn.c Wrapper around fork/exec
4 * Copyright (C) 2002, 2003 Red Hat, Inc.
5 * Copyright (C) 2003 CodeFactory AB
7 * Licensed under the Academic Free License version 1.2
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"
37 * @addtogroup DBusInternalsUtils
42 * I'm pretty sure this whole spawn file could be made simpler,
43 * if you thought about it a bit.
47 * Enumeration for status of a read()
51 READ_STATUS_OK, /**< Read succeeded */
52 READ_STATUS_ERROR, /**< Some kind of error */
53 READ_STATUS_EOF /**< EOF returned */
66 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
68 retval = READ_STATUS_OK;
77 to_read = sizeof (int) * n_ints_in_buf - bytes;
86 if (chunk < 0 && errno == EINTR)
91 dbus_set_error (error,
92 DBUS_ERROR_SPAWN_FAILED,
93 "Failed to read from child pipe (%s)",
94 _dbus_strerror (errno));
96 retval = READ_STATUS_ERROR;
101 retval = READ_STATUS_EOF;
108 *n_ints_read = (int)(bytes / sizeof(int));
121 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
123 retval = READ_STATUS_OK;
131 to_read = sizeof (pid_t) - bytes;
137 ((char*)buf) + bytes,
139 if (chunk < 0 && errno == EINTR)
144 dbus_set_error (error,
145 DBUS_ERROR_SPAWN_FAILED,
146 "Failed to read from child pipe (%s)",
147 _dbus_strerror (errno));
149 retval = READ_STATUS_ERROR;
154 retval = READ_STATUS_EOF;
164 /* The implementation uses an intermediate child between the main process
165 * and the grandchild. The grandchild is our spawned process. The intermediate
166 * child is a babysitter process; it keeps track of when the grandchild
167 * exits/crashes, and reaps the grandchild.
170 /* Messages from children to parents */
173 CHILD_EXITED, /* This message is followed by the exit status int */
174 CHILD_FORK_FAILED, /* Followed by errno */
175 CHILD_EXEC_FAILED, /* Followed by errno */
176 CHILD_PID /* Followed by pid_t */
180 * Babysitter implementation details
182 struct DBusBabysitter
184 int refcount; /**< Reference count */
186 char *executable; /**< executable name to use in error messages */
188 int socket_to_babysitter; /**< Connection to the babysitter process */
189 int error_pipe_from_child; /**< Connection to the process that does the exec() */
191 pid_t sitter_pid; /**< PID Of the babysitter */
192 pid_t grandchild_pid; /**< PID of the grandchild */
194 DBusWatchList *watches; /**< Watches */
196 DBusWatch *error_watch; /**< Error pipe watch */
197 DBusWatch *sitter_watch; /**< Sitter pipe watch */
199 int errnum; /**< Error number */
200 int status; /**< Exit status code */
201 unsigned int have_child_status : 1; /**< True if child status has been reaped */
202 unsigned int have_fork_errnum : 1; /**< True if we have an error code from fork() */
203 unsigned int have_exec_errnum : 1; /**< True if we have an error code from exec() */
206 static DBusBabysitter*
207 _dbus_babysitter_new (void)
209 DBusBabysitter *sitter;
211 sitter = dbus_new0 (DBusBabysitter, 1);
215 sitter->refcount = 1;
217 sitter->socket_to_babysitter = -1;
218 sitter->error_pipe_from_child = -1;
220 sitter->sitter_pid = -1;
221 sitter->grandchild_pid = -1;
223 sitter->watches = _dbus_watch_list_new ();
224 if (sitter->watches == NULL)
230 _dbus_babysitter_unref (sitter);
235 * Increment the reference count on the babysitter object.
237 * @param sitter the babysitter
240 _dbus_babysitter_ref (DBusBabysitter *sitter)
242 _dbus_assert (sitter != NULL);
243 _dbus_assert (sitter->refcount > 0);
245 sitter->refcount += 1;
249 * Decrement the reference count on the babysitter object.
251 * @param sitter the babysitter
254 _dbus_babysitter_unref (DBusBabysitter *sitter)
256 _dbus_assert (sitter != NULL);
257 _dbus_assert (sitter->refcount > 0);
259 sitter->refcount -= 1;
260 if (sitter->refcount == 0)
262 if (sitter->socket_to_babysitter >= 0)
264 close (sitter->socket_to_babysitter);
265 sitter->socket_to_babysitter = -1;
268 if (sitter->error_pipe_from_child >= 0)
270 close (sitter->error_pipe_from_child);
271 sitter->error_pipe_from_child = -1;
274 if (sitter->sitter_pid != -1)
279 /* Reap the babysitter */
281 ret = waitpid (sitter->sitter_pid, &status, 0);
286 else if (errno == ECHILD)
287 _dbus_warn ("Babysitter process not available to be reaped; should not happen\n");
289 _dbus_warn ("Unexpected error %d in waitpid() for babysitter: %s\n",
290 errno, _dbus_strerror (errno));
294 _dbus_verbose ("Reaped %ld, waiting for babysitter %ld\n",
295 (long) ret, (long) sitter->sitter_pid);
297 if (WIFEXITED (sitter->status))
298 _dbus_verbose ("Babysitter exited with status %d\n",
299 WEXITSTATUS (sitter->status));
300 else if (WIFSIGNALED (sitter->status))
301 _dbus_verbose ("Babysitter received signal %d\n",
302 WTERMSIG (sitter->status));
304 _dbus_verbose ("Babysitter exited abnormally\n");
307 sitter->sitter_pid = -1;
310 if (sitter->error_watch)
312 _dbus_watch_invalidate (sitter->error_watch);
313 _dbus_watch_unref (sitter->error_watch);
314 sitter->error_watch = NULL;
317 if (sitter->sitter_watch)
319 _dbus_watch_invalidate (sitter->sitter_watch);
320 _dbus_watch_unref (sitter->sitter_watch);
321 sitter->sitter_watch = NULL;
325 _dbus_watch_list_free (sitter->watches);
327 dbus_free (sitter->executable);
334 read_data (DBusBabysitter *sitter,
342 dbus_error_init (&error);
344 r = read_ints (fd, &what, 1, &got, &error);
348 case READ_STATUS_ERROR:
349 _dbus_warn ("Failed to read data from fd %d: %s\n", fd, error.message);
350 dbus_error_free (&error);
353 case READ_STATUS_EOF:
365 case CHILD_FORK_FAILED:
366 case CHILD_EXEC_FAILED:
370 r = read_ints (fd, &arg, 1, &got, &error);
374 case READ_STATUS_ERROR:
375 _dbus_warn ("Failed to read arg from fd %d: %s\n", fd, error.message);
376 dbus_error_free (&error);
378 case READ_STATUS_EOF:
386 if (what == CHILD_EXITED)
388 sitter->have_child_status = TRUE;
389 sitter->status = arg;
390 _dbus_verbose ("recorded child status exited = %d signaled = %d exitstatus = %d termsig = %d\n",
391 WIFEXITED (sitter->status), WIFSIGNALED (sitter->status),
392 WEXITSTATUS (sitter->status), WTERMSIG (sitter->status));
394 else if (what == CHILD_FORK_FAILED)
396 sitter->have_fork_errnum = TRUE;
397 sitter->errnum = arg;
398 _dbus_verbose ("recorded fork errnum %d\n", sitter->errnum);
400 else if (what == CHILD_EXEC_FAILED)
402 sitter->have_exec_errnum = TRUE;
403 sitter->errnum = arg;
404 _dbus_verbose ("recorded exec errnum %d\n", sitter->errnum);
413 r = read_pid (fd, &pid, &error);
417 case READ_STATUS_ERROR:
418 _dbus_warn ("Failed to read PID from fd %d: %s\n", fd, error.message);
419 dbus_error_free (&error);
421 case READ_STATUS_EOF:
427 sitter->grandchild_pid = pid;
429 _dbus_verbose ("recorded grandchild pid %d\n", sitter->grandchild_pid);
433 _dbus_warn ("Unknown message received from babysitter process\n");
442 close_socket_to_babysitter (DBusBabysitter *sitter)
444 _dbus_verbose ("Closing babysitter\n");
445 close (sitter->socket_to_babysitter);
446 sitter->socket_to_babysitter = -1;
450 close_error_pipe_from_child (DBusBabysitter *sitter)
452 _dbus_verbose ("Closing child error\n");
453 close (sitter->error_pipe_from_child);
454 sitter->error_pipe_from_child = -1;
458 handle_babysitter_socket (DBusBabysitter *sitter,
461 /* Even if we have POLLHUP, we want to keep reading
462 * data until POLLIN goes away; so this function only
463 * looks at HUP/ERR if no IN is set.
465 if (revents & _DBUS_POLLIN)
467 _dbus_verbose ("Reading data from babysitter\n");
468 if (read_data (sitter, sitter->socket_to_babysitter) != READ_STATUS_OK)
469 close_socket_to_babysitter (sitter);
471 else if (revents & (_DBUS_POLLERR | _DBUS_POLLHUP))
473 close_socket_to_babysitter (sitter);
478 handle_error_pipe (DBusBabysitter *sitter,
481 if (revents & _DBUS_POLLIN)
483 _dbus_verbose ("Reading data from child error\n");
484 if (read_data (sitter, sitter->error_pipe_from_child) != READ_STATUS_OK)
485 close_error_pipe_from_child (sitter);
487 else if (revents & (_DBUS_POLLERR | _DBUS_POLLHUP))
489 close_error_pipe_from_child (sitter);
493 /* returns whether there were any poll events handled */
495 babysitter_iteration (DBusBabysitter *sitter,
500 dbus_bool_t descriptors_ready;
502 descriptors_ready = FALSE;
506 if (sitter->error_pipe_from_child >= 0)
508 fds[i].fd = sitter->error_pipe_from_child;
509 fds[i].events = _DBUS_POLLIN;
514 if (sitter->socket_to_babysitter >= 0)
516 fds[i].fd = sitter->socket_to_babysitter;
517 fds[i].events = _DBUS_POLLIN;
526 ret = _dbus_poll (fds, i, 0);
527 if (ret == 0 && block)
528 ret = _dbus_poll (fds, i, -1);
532 descriptors_ready = TRUE;
537 if (fds[i].fd == sitter->error_pipe_from_child)
538 handle_error_pipe (sitter, fds[i].revents);
539 else if (fds[i].fd == sitter->socket_to_babysitter)
540 handle_babysitter_socket (sitter, fds[i].revents);
545 return descriptors_ready;
549 * Macro returns #TRUE if the babysitter still has live sockets open to the
550 * babysitter child or the grandchild.
552 #define LIVE_CHILDREN(sitter) ((sitter)->socket_to_babysitter >= 0 || (sitter)->error_pipe_from_child >= 0)
555 * Blocks until the babysitter process gives us the PID of the spawned grandchild,
556 * then kills the spawned grandchild.
558 * @param sitter the babysitter object
561 _dbus_babysitter_kill_child (DBusBabysitter *sitter)
563 /* be sure we have the PID of the child */
564 while (LIVE_CHILDREN (sitter) &&
565 sitter->grandchild_pid == -1)
566 babysitter_iteration (sitter, TRUE);
568 _dbus_verbose ("Got child PID %ld for killing\n",
569 (long) sitter->grandchild_pid);
571 if (sitter->grandchild_pid == -1)
572 return; /* child is already dead, or we're so hosed we'll never recover */
574 kill (sitter->grandchild_pid, SIGKILL);
578 * Checks whether the child has exited, without blocking.
580 * @param sitter the babysitter
583 _dbus_babysitter_get_child_exited (DBusBabysitter *sitter)
586 /* Be sure we're up-to-date */
587 while (LIVE_CHILDREN (sitter) &&
588 babysitter_iteration (sitter, FALSE))
591 /* We will have exited the babysitter when the child has exited */
592 return sitter->socket_to_babysitter < 0;
596 * Sets the #DBusError with an explanation of why the spawned
597 * child process exited (on a signal, or whatever). If
598 * the child process has not exited, does nothing (error
599 * will remain unset).
601 * @param sitter the babysitter
602 * @param error an error to fill in
605 _dbus_babysitter_set_child_exit_error (DBusBabysitter *sitter,
608 if (!_dbus_babysitter_get_child_exited (sitter))
611 /* Note that if exec fails, we will also get a child status
612 * from the babysitter saying the child exited,
613 * so we need to give priority to the exec error
615 if (sitter->have_exec_errnum)
617 dbus_set_error (error, DBUS_ERROR_SPAWN_EXEC_FAILED,
618 "Failed to execute program %s: %s",
619 sitter->executable, _dbus_strerror (sitter->errnum));
621 else if (sitter->have_fork_errnum)
623 dbus_set_error (error, DBUS_ERROR_NO_MEMORY,
624 "Failed to fork a new process %s: %s",
625 sitter->executable, _dbus_strerror (sitter->errnum));
627 else if (sitter->have_child_status)
629 if (WIFEXITED (sitter->status))
630 dbus_set_error (error, DBUS_ERROR_SPAWN_CHILD_EXITED,
631 "Process %s exited with status %d",
632 sitter->executable, WEXITSTATUS (sitter->status));
633 else if (WIFSIGNALED (sitter->status))
634 dbus_set_error (error, DBUS_ERROR_SPAWN_CHILD_SIGNALED,
635 "Process %s received signal %d",
636 sitter->executable, WTERMSIG (sitter->status));
638 dbus_set_error (error, DBUS_ERROR_FAILED,
639 "Process %s exited abnormally",
644 dbus_set_error (error, DBUS_ERROR_FAILED,
645 "Process %s exited, reason unknown",
651 * Sets watch functions to notify us when the
652 * babysitter object needs to read/write file descriptors.
654 * @param sitter the babysitter
655 * @param add_function function to begin monitoring a new descriptor.
656 * @param remove_function function to stop monitoring a descriptor.
657 * @param toggled_function function to notify when the watch is enabled/disabled
658 * @param data data to pass to add_function and remove_function.
659 * @param free_data_function function to be called to free the data.
660 * @returns #FALSE on failure (no memory)
663 _dbus_babysitter_set_watch_functions (DBusBabysitter *sitter,
664 DBusAddWatchFunction add_function,
665 DBusRemoveWatchFunction remove_function,
666 DBusWatchToggledFunction toggled_function,
668 DBusFreeFunction free_data_function)
670 return _dbus_watch_list_set_functions (sitter->watches,
679 handle_watch (DBusWatch *watch,
680 unsigned int condition,
683 DBusBabysitter *sitter = data;
688 if (condition & DBUS_WATCH_READABLE)
689 revents |= _DBUS_POLLIN;
690 if (condition & DBUS_WATCH_ERROR)
691 revents |= _DBUS_POLLERR;
692 if (condition & DBUS_WATCH_HANGUP)
693 revents |= _DBUS_POLLHUP;
695 fd = dbus_watch_get_fd (watch);
697 if (fd == sitter->error_pipe_from_child)
698 handle_error_pipe (sitter, revents);
699 else if (fd == sitter->socket_to_babysitter)
700 handle_babysitter_socket (sitter, revents);
702 while (LIVE_CHILDREN (sitter) &&
703 babysitter_iteration (sitter, FALSE))
709 /** Helps remember which end of the pipe is which */
711 /** Helps remember which end of the pipe is which */
715 /* Avoids a danger in threaded situations (calling close()
716 * on a file descriptor twice, and another thread has
717 * re-opened it since the first close)
720 close_and_invalidate (int *fd)
739 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
743 dbus_set_error (error,
744 DBUS_ERROR_SPAWN_FAILED,
745 "Failed to create pipe for communicating with child process (%s)",
746 _dbus_strerror (errno));
754 do_write (int fd, const void *buf, size_t count)
756 size_t bytes_written;
763 ret = write (fd, ((const char*)buf) + bytes_written, count - bytes_written);
771 _dbus_warn ("Failed to write data to pipe!\n");
772 exit (1); /* give up, we suck */
776 bytes_written += ret;
778 if (bytes_written < count)
783 write_err_and_exit (int fd, int msg)
787 do_write (fd, &msg, sizeof (msg));
788 do_write (fd, &en, sizeof (en));
794 write_pid (int fd, pid_t pid)
798 do_write (fd, &msg, sizeof (msg));
799 do_write (fd, &pid, sizeof (pid));
803 write_status_and_exit (int fd, int status)
805 int msg = CHILD_EXITED;
807 do_write (fd, &msg, sizeof (msg));
808 do_write (fd, &status, sizeof (status));
814 do_exec (int child_err_report_fd,
816 DBusSpawnChildSetupFunc child_setup,
819 #ifdef DBUS_BUILD_TESTS
823 _dbus_verbose_reset ();
824 _dbus_verbose ("Child process has PID %lu\n",
828 (* child_setup) (user_data);
830 #ifdef DBUS_BUILD_TESTS
831 max_open = sysconf (_SC_OPEN_MAX);
833 for (i = 3; i < max_open; i++)
837 if (i == child_err_report_fd)
840 retval = fcntl (i, F_GETFD);
842 if (retval != -1 && !(retval & FD_CLOEXEC))
843 _dbus_warn ("Fd %d did not have the close-on-exec flag set!\n", i);
847 execv (argv[0], argv);
850 write_err_and_exit (child_err_report_fd,
855 check_babysit_events (pid_t grandchild_pid,
862 ret = waitpid (grandchild_pid, &status, WNOHANG);
866 _dbus_verbose ("no child exited\n");
868 ; /* no child exited */
872 /* This isn't supposed to happen. */
873 _dbus_warn ("unexpected waitpid() failure in check_babysit_events(): %s\n",
874 _dbus_strerror (errno));
877 else if (ret == grandchild_pid)
880 _dbus_verbose ("reaped child pid %ld\n", (long) ret);
882 write_status_and_exit (parent_pipe, status);
886 _dbus_warn ("waitpid() reaped pid %d that we've never heard of\n",
891 if (revents & _DBUS_POLLIN)
893 _dbus_verbose ("babysitter got POLLIN from parent pipe\n");
896 if (revents & (_DBUS_POLLERR | _DBUS_POLLHUP))
898 /* Parent is gone, so we just exit */
899 _dbus_verbose ("babysitter got POLLERR or POLLHUP from parent\n");
904 static int babysit_sigchld_pipe = -1;
907 babysit_signal_handler (int signo)
911 write (babysit_sigchld_pipe, &b, 1);
917 babysit (pid_t grandchild_pid,
922 /* We don't exec, so we keep parent state, such as the pid that
923 * _dbus_verbose() uses. Reset the pid here.
925 _dbus_verbose_reset ();
927 /* I thought SIGCHLD would just wake up the poll, but
928 * that didn't seem to work, so added this pipe.
929 * Probably the pipe is more likely to work on busted
930 * operating systems anyhow.
932 if (pipe (sigchld_pipe) < 0)
934 _dbus_warn ("Not enough file descriptors to create pipe in babysitter process\n");
938 babysit_sigchld_pipe = sigchld_pipe[WRITE_END];
940 _dbus_set_signal_handler (SIGCHLD, babysit_signal_handler);
942 write_pid (parent_pipe, grandchild_pid);
944 check_babysit_events (grandchild_pid, parent_pipe, 0);
950 pfds[0].fd = parent_pipe;
951 pfds[0].events = _DBUS_POLLIN;
954 pfds[1].fd = sigchld_pipe[READ_END];
955 pfds[1].events = _DBUS_POLLIN;
958 _dbus_poll (pfds, _DBUS_N_ELEMENTS (pfds), -1);
960 if (pfds[0].revents != 0)
962 check_babysit_events (grandchild_pid, parent_pipe, pfds[0].revents);
964 else if (pfds[1].revents & _DBUS_POLLIN)
967 read (sigchld_pipe[READ_END], &b, 1);
968 /* do waitpid check */
969 check_babysit_events (grandchild_pid, parent_pipe, 0);
977 * Spawns a new process. The executable name and argv[0]
978 * are the same, both are provided in argv[0]. The child_setup
979 * function is passed the given user_data and is run in the child
980 * just before calling exec().
982 * Also creates a "babysitter" which tracks the status of the
983 * child process, advising the parent if the child exits.
984 * If the spawn fails, no babysitter is created.
985 * If sitter_p is #NULL, no babysitter is kept.
987 * @param sitter_p return location for babysitter or #NULL
988 * @param argv the executable and arguments
989 * @param child_setup function to call in child pre-exec()
990 * @param user_data user data for setup function
991 * @param error error object to be filled in if function fails
992 * @returns #TRUE on success, #FALSE if error is filled in
995 _dbus_spawn_async_with_babysitter (DBusBabysitter **sitter_p,
997 DBusSpawnChildSetupFunc child_setup,
1001 DBusBabysitter *sitter;
1002 int child_err_report_pipe[2] = { -1, -1 };
1003 int babysitter_pipe[2] = { -1, -1 };
1006 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1011 sitter = _dbus_babysitter_new ();
1014 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
1018 sitter->executable = _dbus_strdup (argv[0]);
1019 if (sitter->executable == NULL)
1021 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
1022 goto cleanup_and_fail;
1025 if (!make_pipe (child_err_report_pipe, error))
1026 goto cleanup_and_fail;
1028 _dbus_fd_set_close_on_exec (child_err_report_pipe[READ_END]);
1030 if (!_dbus_full_duplex_pipe (&babysitter_pipe[0], &babysitter_pipe[1], TRUE, error))
1031 goto cleanup_and_fail;
1033 _dbus_fd_set_close_on_exec (babysitter_pipe[0]);
1034 _dbus_fd_set_close_on_exec (babysitter_pipe[1]);
1036 /* Setting up the babysitter is only useful in the parent,
1037 * but we don't want to run out of memory and fail
1038 * after we've already forked, since then we'd leak
1039 * child processes everywhere.
1041 sitter->error_watch = _dbus_watch_new (child_err_report_pipe[READ_END],
1042 DBUS_WATCH_READABLE,
1043 TRUE, handle_watch, sitter, NULL);
1044 if (sitter->error_watch == NULL)
1046 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
1047 goto cleanup_and_fail;
1050 if (!_dbus_watch_list_add_watch (sitter->watches, sitter->error_watch))
1052 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
1053 goto cleanup_and_fail;
1056 sitter->sitter_watch = _dbus_watch_new (babysitter_pipe[0],
1057 DBUS_WATCH_READABLE,
1058 TRUE, handle_watch, sitter, NULL);
1059 if (sitter->sitter_watch == NULL)
1061 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
1062 goto cleanup_and_fail;
1065 if (!_dbus_watch_list_add_watch (sitter->watches, sitter->sitter_watch))
1067 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
1068 goto cleanup_and_fail;
1071 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1077 dbus_set_error (error,
1078 DBUS_ERROR_SPAWN_FORK_FAILED,
1079 "Failed to fork (%s)",
1080 _dbus_strerror (errno));
1081 goto cleanup_and_fail;
1085 /* Immediate child, this is the babysitter process. */
1088 /* Be sure we crash if the parent exits
1089 * and we write to the err_report_pipe
1091 signal (SIGPIPE, SIG_DFL);
1093 /* Close the parent's end of the pipes. */
1094 close_and_invalidate (&child_err_report_pipe[READ_END]);
1095 close_and_invalidate (&babysitter_pipe[0]);
1097 /* Create the child that will exec () */
1098 grandchild_pid = fork ();
1100 if (grandchild_pid < 0)
1102 write_err_and_exit (babysitter_pipe[1],
1104 _dbus_assert_not_reached ("Got to code after write_err_and_exit()");
1106 else if (grandchild_pid == 0)
1108 do_exec (child_err_report_pipe[WRITE_END],
1110 child_setup, user_data);
1111 _dbus_assert_not_reached ("Got to code after exec() - should have exited on error");
1115 babysit (grandchild_pid, babysitter_pipe[1]);
1116 _dbus_assert_not_reached ("Got to code after babysit()");
1121 /* Close the uncared-about ends of the pipes */
1122 close_and_invalidate (&child_err_report_pipe[WRITE_END]);
1123 close_and_invalidate (&babysitter_pipe[1]);
1125 sitter->socket_to_babysitter = babysitter_pipe[0];
1126 babysitter_pipe[0] = -1;
1128 sitter->error_pipe_from_child = child_err_report_pipe[READ_END];
1129 child_err_report_pipe[READ_END] = -1;
1131 sitter->sitter_pid = pid;
1133 if (sitter_p != NULL)
1136 _dbus_babysitter_unref (sitter);
1138 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1145 _DBUS_ASSERT_ERROR_IS_SET (error);
1147 close_and_invalidate (&child_err_report_pipe[READ_END]);
1148 close_and_invalidate (&child_err_report_pipe[WRITE_END]);
1149 close_and_invalidate (&babysitter_pipe[0]);
1150 close_and_invalidate (&babysitter_pipe[1]);
1153 _dbus_babysitter_unref (sitter);
1160 #ifdef DBUS_BUILD_TESTS
1163 _dbus_babysitter_block_for_child_exit (DBusBabysitter *sitter)
1165 while (LIVE_CHILDREN (sitter))
1166 babysitter_iteration (sitter, TRUE);
1170 check_spawn_nonexistent (void *data)
1172 char *argv[4] = { NULL, NULL, NULL, NULL };
1173 DBusBabysitter *sitter;
1178 dbus_error_init (&error);
1180 /*** Test launching nonexistent binary */
1182 argv[0] = "/this/does/not/exist/32542sdgafgafdg";
1183 if (_dbus_spawn_async_with_babysitter (&sitter, argv,
1187 _dbus_babysitter_block_for_child_exit (sitter);
1188 _dbus_babysitter_set_child_exit_error (sitter, &error);
1192 _dbus_babysitter_unref (sitter);
1194 if (!dbus_error_is_set (&error))
1196 _dbus_warn ("Did not get an error launching nonexistent executable\n");
1200 if (!(dbus_error_has_name (&error, DBUS_ERROR_NO_MEMORY) ||
1201 dbus_error_has_name (&error, DBUS_ERROR_SPAWN_EXEC_FAILED)))
1203 _dbus_warn ("Not expecting error when launching nonexistent executable: %s: %s\n",
1204 error.name, error.message);
1205 dbus_error_free (&error);
1209 dbus_error_free (&error);
1215 check_spawn_segfault (void *data)
1217 char *argv[4] = { NULL, NULL, NULL, NULL };
1218 DBusBabysitter *sitter;
1223 dbus_error_init (&error);
1225 /*** Test launching segfault binary */
1227 argv[0] = TEST_SEGFAULT_BINARY;
1228 if (_dbus_spawn_async_with_babysitter (&sitter, argv,
1232 _dbus_babysitter_block_for_child_exit (sitter);
1233 _dbus_babysitter_set_child_exit_error (sitter, &error);
1237 _dbus_babysitter_unref (sitter);
1239 if (!dbus_error_is_set (&error))
1241 _dbus_warn ("Did not get an error launching segfaulting binary\n");
1245 if (!(dbus_error_has_name (&error, DBUS_ERROR_NO_MEMORY) ||
1246 dbus_error_has_name (&error, DBUS_ERROR_SPAWN_CHILD_SIGNALED)))
1248 _dbus_warn ("Not expecting error when launching segfaulting executable: %s: %s\n",
1249 error.name, error.message);
1250 dbus_error_free (&error);
1254 dbus_error_free (&error);
1260 check_spawn_exit (void *data)
1262 char *argv[4] = { NULL, NULL, NULL, NULL };
1263 DBusBabysitter *sitter;
1268 dbus_error_init (&error);
1270 /*** Test launching exit failure binary */
1272 argv[0] = TEST_EXIT_BINARY;
1273 if (_dbus_spawn_async_with_babysitter (&sitter, argv,
1277 _dbus_babysitter_block_for_child_exit (sitter);
1278 _dbus_babysitter_set_child_exit_error (sitter, &error);
1282 _dbus_babysitter_unref (sitter);
1284 if (!dbus_error_is_set (&error))
1286 _dbus_warn ("Did not get an error launching binary that exited with failure code\n");
1290 if (!(dbus_error_has_name (&error, DBUS_ERROR_NO_MEMORY) ||
1291 dbus_error_has_name (&error, DBUS_ERROR_SPAWN_CHILD_EXITED)))
1293 _dbus_warn ("Not expecting error when launching exiting executable: %s: %s\n",
1294 error.name, error.message);
1295 dbus_error_free (&error);
1299 dbus_error_free (&error);
1305 check_spawn_and_kill (void *data)
1307 char *argv[4] = { NULL, NULL, NULL, NULL };
1308 DBusBabysitter *sitter;
1313 dbus_error_init (&error);
1315 /*** Test launching sleeping binary then killing it */
1317 argv[0] = TEST_SLEEP_FOREVER_BINARY;
1318 if (_dbus_spawn_async_with_babysitter (&sitter, argv,
1322 _dbus_babysitter_kill_child (sitter);
1324 _dbus_babysitter_block_for_child_exit (sitter);
1326 _dbus_babysitter_set_child_exit_error (sitter, &error);
1330 _dbus_babysitter_unref (sitter);
1332 if (!dbus_error_is_set (&error))
1334 _dbus_warn ("Did not get an error after killing spawned binary\n");
1338 if (!(dbus_error_has_name (&error, DBUS_ERROR_NO_MEMORY) ||
1339 dbus_error_has_name (&error, DBUS_ERROR_SPAWN_CHILD_SIGNALED)))
1341 _dbus_warn ("Not expecting error when killing executable: %s: %s\n",
1342 error.name, error.message);
1343 dbus_error_free (&error);
1347 dbus_error_free (&error);
1353 _dbus_spawn_test (const char *test_data_dir)
1355 if (!_dbus_test_oom_handling ("spawn_nonexistent",
1356 check_spawn_nonexistent,
1360 if (!_dbus_test_oom_handling ("spawn_segfault",
1361 check_spawn_segfault,
1365 if (!_dbus_test_oom_handling ("spawn_exit",
1370 if (!_dbus_test_oom_handling ("spawn_and_kill",
1371 check_spawn_and_kill,