27 #include "dbus-spawn.h"
28 #include "dbus-sysdeps-unix.h"
29 #include "dbus-internals.h"
30 #include "dbus-test.h"
31 #include "dbus-protocol.h"
42 extern char **environ;
74 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
83 to_read =
sizeof (int) * n_ints_in_buf - bytes;
94 if (chunk < 0 && errno == EINTR)
101 "Failed to read from child pipe (%s)",
102 _dbus_strerror (errno));
116 *n_ints_read = (int)(bytes /
sizeof(
int));
129 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
138 to_read =
sizeof (pid_t) - bytes;
146 ((
char*)buf) + bytes,
148 if (chunk < 0 && errno == EINTR)
155 "Failed to read from child pipe (%s)",
156 _dbus_strerror (errno));
208 DBusBabysitterFinishedFunc finished_cb;
213 unsigned int have_child_status : 1;
219 _dbus_babysitter_new (
void)
290 close_socket_to_babysitter (sitter);
292 close_error_pipe_from_child (sitter);
303 ret = waitpid (sitter->
sitter_pid, &status, WNOHANG);
313 ret = waitpid (sitter->
sitter_pid, &status, 0);
319 else if (errno == ECHILD)
320 _dbus_warn (
"Babysitter process not available to be reaped; should not happen\n");
322 _dbus_warn (
"Unexpected error %d in waitpid() for babysitter: %s\n",
323 errno, _dbus_strerror (errno));
327 _dbus_verbose (
"Reaped %ld, waiting for babysitter %ld\n",
330 if (WIFEXITED (sitter->
status))
331 _dbus_verbose (
"Babysitter exited with status %d\n",
332 WEXITSTATUS (sitter->
status));
333 else if (WIFSIGNALED (sitter->
status))
334 _dbus_verbose (
"Babysitter received signal %d\n",
335 WTERMSIG (sitter->
status));
337 _dbus_verbose (
"Babysitter exited abnormally\n");
361 r = read_ints (fd, &what, 1, &got, &error);
382 case CHILD_FORK_FAILED:
383 case CHILD_EXEC_FAILED:
387 r = read_ints (fd, &arg, 1, &got, &error);
403 if (what == CHILD_EXITED)
405 sitter->have_child_status =
TRUE;
408 _dbus_verbose (
"recorded child status exited = %d signaled = %d exitstatus = %d termsig = %d\n",
409 WIFEXITED (sitter->
status), WIFSIGNALED (sitter->
status),
410 WEXITSTATUS (sitter->
status), WTERMSIG (sitter->
status));
412 else if (what == CHILD_FORK_FAILED)
416 _dbus_verbose (
"recorded fork errnum %d\n", sitter->
errnum);
418 else if (what == CHILD_EXEC_FAILED)
422 _dbus_verbose (
"recorded exec errnum %d\n", sitter->
errnum);
431 r = read_pid (fd, &pid, &error);
447 _dbus_verbose (
"recorded grandchild pid %d\n", sitter->
grandchild_pid);
451 _dbus_warn (
"Unknown message received from babysitter process\n");
462 _dbus_verbose (
"Closing babysitter\n");
483 _dbus_verbose (
"Closing child error\n");
511 _dbus_verbose (
"Reading data from babysitter\n");
513 close_socket_to_babysitter (sitter);
517 close_socket_to_babysitter (sitter);
525 if (revents & _DBUS_POLLIN)
527 _dbus_verbose (
"Reading data from child error\n");
529 close_error_pipe_from_child (sitter);
533 close_error_pipe_from_child (sitter);
546 descriptors_ready =
FALSE;
574 while (ret < 0 && errno == EINTR);
576 if (ret == 0 && block)
582 while (ret < 0 && errno == EINTR);
587 descriptors_ready =
TRUE;
593 handle_error_pipe (sitter, fds[i].revents);
595 handle_babysitter_socket (sitter, fds[i].revents);
600 return descriptors_ready;
607 #define LIVE_CHILDREN(sitter) ((sitter)->socket_to_babysitter >= 0 || (sitter)->error_pipe_from_child >= 0)
621 babysitter_iteration (sitter,
TRUE);
623 _dbus_verbose (
"Got child PID %ld for killing\n",
643 babysitter_iteration (sitter,
FALSE))
669 if (!sitter->have_child_status ||
670 !(WIFEXITED (sitter->
status)))
673 *status = WEXITSTATUS (sitter->
status);
700 "Failed to execute program %s: %s",
706 "Failed to fork a new process %s: %s",
709 else if (sitter->have_child_status)
711 if (WIFEXITED (sitter->
status))
713 "Process %s exited with status %d",
715 else if (WIFSIGNALED (sitter->
status))
717 "Process %s received signal %d",
721 "Process %s exited abnormally",
727 "Process %s exited, reason unknown",
762 unsigned int condition,
780 handle_error_pipe (sitter, revents);
782 handle_babysitter_socket (sitter, revents);
785 babysitter_iteration (sitter,
FALSE))
794 sitter->finished_cb !=
NULL)
796 sitter->finished_cb (sitter, sitter->finished_data);
797 sitter->finished_cb =
NULL;
815 close_and_invalidate (
int *fd)
839 retval = pipe2 (p, O_CLOEXEC);
840 cloexec_done = retval >= 0;
844 if (retval < 0 && errno == ENOSYS)
850 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
856 "Failed to create pipe for communicating with child process (%s)",
857 _dbus_strerror (errno));
873 do_write (
int fd,
const void *buf,
size_t count)
875 size_t bytes_written;
882 ret = write (fd, ((
const char*)buf) + bytes_written, count - bytes_written);
890 _dbus_warn (
"Failed to write data to pipe!\n");
895 bytes_written += ret;
897 if (bytes_written < count)
902 write_err_and_exit (
int fd,
int msg)
906 do_write (fd, &msg,
sizeof (msg));
907 do_write (fd, &en,
sizeof (en));
913 write_pid (
int fd, pid_t pid)
917 do_write (fd, &msg,
sizeof (msg));
918 do_write (fd, &pid,
sizeof (pid));
922 write_status_and_exit (
int fd,
int status)
924 int msg = CHILD_EXITED;
926 do_write (fd, &msg,
sizeof (msg));
927 do_write (fd, &status,
sizeof (status));
933 do_exec (
int child_err_report_fd,
936 DBusSpawnChildSetupFunc child_setup,
939 #ifdef DBUS_BUILD_TESTS
943 _dbus_verbose_reset ();
948 (* child_setup) (user_data);
950 #ifdef DBUS_BUILD_TESTS
951 max_open = sysconf (_SC_OPEN_MAX);
953 for (i = 3; i < max_open; i++)
957 if (i == child_err_report_fd)
960 retval = fcntl (i, F_GETFD);
962 if (retval != -1 && !(retval & FD_CLOEXEC))
963 _dbus_warn (
"Fd %d did not have the close-on-exec flag set!\n", i);
974 execve (argv[0], argv, envp);
977 write_err_and_exit (child_err_report_fd,
982 check_babysit_events (pid_t grandchild_pid,
991 ret = waitpid (grandchild_pid, &status, WNOHANG);
996 while (ret < 0 && errno == EINTR);
1000 _dbus_verbose (
"no child exited\n");
1007 _dbus_warn (
"unexpected waitpid() failure in check_babysit_events(): %s\n",
1008 _dbus_strerror (errno));
1011 else if (ret == grandchild_pid)
1014 _dbus_verbose (
"reaped child pid %ld\n", (
long) ret);
1016 write_status_and_exit (parent_pipe, status);
1020 _dbus_warn (
"waitpid() reaped pid %d that we've never heard of\n",
1025 if (revents & _DBUS_POLLIN)
1027 _dbus_verbose (
"babysitter got POLLIN from parent pipe\n");
1033 _dbus_verbose (
"babysitter got POLLERR or POLLHUP from parent\n");
1038 static int babysit_sigchld_pipe = -1;
1041 babysit_signal_handler (
int signo)
1045 if (write (babysit_sigchld_pipe, &b, 1) <= 0)
1051 babysit (pid_t grandchild_pid,
1054 int sigchld_pipe[2];
1059 _dbus_verbose_reset ();
1066 if (pipe (sigchld_pipe) < 0)
1068 _dbus_warn (
"Not enough file descriptors to create pipe in babysitter process\n");
1072 babysit_sigchld_pipe = sigchld_pipe[
WRITE_END];
1076 write_pid (parent_pipe, grandchild_pid);
1078 check_babysit_events (grandchild_pid, parent_pipe, 0);
1084 pfds[0].
fd = parent_pipe;
1094 _dbus_warn (
"_dbus_poll() error: %s\n", strerror (errno));
1098 if (pfds[0].revents != 0)
1100 check_babysit_events (grandchild_pid, parent_pipe, pfds[0].revents);
1102 else if (pfds[1].revents & _DBUS_POLLIN)
1105 if (read (sigchld_pipe[
READ_END], &b, 1) == -1)
1110 check_babysit_events (grandchild_pid, parent_pipe, 0);
1140 DBusSpawnChildSetupFunc child_setup,
1145 int child_err_report_pipe[2] = { -1, -1 };
1146 int babysitter_pipe[2] = { -1, -1 };
1149 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1151 if (sitter_p !=
NULL)
1156 sitter = _dbus_babysitter_new ();
1167 goto cleanup_and_fail;
1170 if (!make_pipe (child_err_report_pipe, error))
1171 goto cleanup_and_fail;
1174 goto cleanup_and_fail;
1182 DBUS_WATCH_READABLE,
1187 goto cleanup_and_fail;
1199 goto cleanup_and_fail;
1203 DBUS_WATCH_READABLE,
1208 goto cleanup_and_fail;
1220 goto cleanup_and_fail;
1223 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1231 "Failed to fork (%s)",
1232 _dbus_strerror (errno));
1233 goto cleanup_and_fail;
1243 signal (SIGPIPE, SIG_DFL);
1246 close_and_invalidate (&child_err_report_pipe[READ_END]);
1247 close_and_invalidate (&babysitter_pipe[0]);
1250 grandchild_pid = fork ();
1252 if (grandchild_pid < 0)
1254 write_err_and_exit (babysitter_pipe[1],
1258 else if (grandchild_pid == 0)
1262 signal (SIGPIPE, SIG_IGN);
1264 do_exec (child_err_report_pipe[
WRITE_END],
1267 child_setup, user_data);
1272 babysit (grandchild_pid, babysitter_pipe[1]);
1279 close_and_invalidate (&child_err_report_pipe[
WRITE_END]);
1280 close_and_invalidate (&babysitter_pipe[1]);
1283 babysitter_pipe[0] = -1;
1286 child_err_report_pipe[
READ_END] = -1;
1290 if (sitter_p !=
NULL)
1297 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1304 _DBUS_ASSERT_ERROR_IS_SET (error);
1306 close_and_invalidate (&child_err_report_pipe[READ_END]);
1307 close_and_invalidate (&child_err_report_pipe[
WRITE_END]);
1308 close_and_invalidate (&babysitter_pipe[0]);
1309 close_and_invalidate (&babysitter_pipe[1]);
1319 DBusBabysitterFinishedFunc finished,
1322 sitter->finished_cb = finished;
1323 sitter->finished_data = user_data;
1328 #ifdef DBUS_BUILD_TESTS
1331 get_test_exec (
const char *exe,
1334 const char *dbus_test_exec;
1338 if (dbus_test_exec ==
NULL)
1339 dbus_test_exec = DBUS_TEST_EXEC;
1345 dbus_test_exec, exe, DBUS_EXEEXT))
1358 babysitter_iteration (sitter,
TRUE);
1362 check_spawn_nonexistent (
void *data)
1370 argv[0] =
"/this/does/not/exist/32542sdgafgafdg";
1375 _dbus_babysitter_block_for_child_exit (sitter);
1384 _dbus_warn (
"Did not get an error launching nonexistent executable\n");
1391 _dbus_warn (
"Not expecting error when launching nonexistent executable: %s: %s\n",
1403 check_spawn_segfault (
void *data)
1412 argv[0] = get_test_exec (
"test-segfault", &argv0);
1414 if (argv[0] ==
NULL)
1424 _dbus_babysitter_block_for_child_exit (sitter);
1435 _dbus_warn (
"Did not get an error launching segfaulting binary\n");
1442 _dbus_warn (
"Not expecting error when launching segfaulting executable: %s: %s\n",
1454 check_spawn_exit (
void *data)
1463 argv[0] = get_test_exec (
"test-exit", &argv0);
1465 if (argv[0] ==
NULL)
1475 _dbus_babysitter_block_for_child_exit (sitter);
1486 _dbus_warn (
"Did not get an error launching binary that exited with failure code\n");
1493 _dbus_warn (
"Not expecting error when launching exiting executable: %s: %s\n",
1505 check_spawn_and_kill (
void *data)
1514 argv[0] = get_test_exec (
"test-sleep-forever", &argv0);
1516 if (argv[0] ==
NULL)
1528 _dbus_babysitter_block_for_child_exit (sitter);
1540 _dbus_warn (
"Did not get an error after killing spawned binary\n");
1547 _dbus_warn (
"Not expecting error when killing executable: %s: %s\n",
1559 _dbus_spawn_test (
const char *test_data_dir)
1561 if (!_dbus_test_oom_handling (
"spawn_nonexistent",
1562 check_spawn_nonexistent,
1566 if (!_dbus_test_oom_handling (
"spawn_segfault",
1567 check_spawn_segfault,
1571 if (!_dbus_test_oom_handling (
"spawn_exit",
1576 if (!_dbus_test_oom_handling (
"spawn_and_kill",
1577 check_spawn_and_kill,