1 /* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
2 /* dbus-launch.c dbus-launch utility
4 * Copyright (C) 2003, 2006 Red Hat, Inc.
5 * Copyright (C) 2006 Thiago Macieira <thiago@kde.org>
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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
26 #include "dbus-launch.h"
38 #include <sys/select.h>
43 extern Display *xdisplay;
48 * If you are in a shell and run "dbus-launch myapp", here is what happens:
51 * \- main() --exec--> myapp[*]
52 * \- "intermediate parent"
53 * \- bus-runner --exec--> dbus-daemon --fork
54 * \- babysitter[*] \- final dbus-daemon[*]
56 * Processes marked [*] survive the initial flurry of activity.
58 * If you run "dbus-launch --sh-syntax" then the diagram is the same, except
59 * that main() prints variables and exits 0 instead of exec'ing myapp.
63 * dbus-daemon --print-pid -> bus_pid_to_launcher_pipe -> main
64 * dbus-daemon --print-address -> bus_address_to_launcher_pipe -> main
65 * main -> bus_pid_to_babysitter_pipe -> babysitter
67 * The intermediate parent looks pretty useless at first glance. Its purpose
68 * is to avoid the bus-runner becoming a zombie: when the intermediate parent
69 * terminates, the bus-runner and babysitter are reparented to init, which
70 * reaps them if they have finished. We can't rely on main() to reap arbitrary
71 * children because it might exec myapp, after which it can't be relied on to
72 * reap its children. We *can* rely on main() to reap the intermediate parent,
73 * because that happens before it execs myapp.
75 * It's unclear why dbus-daemon needs to fork, but we explicitly tell it to
76 * for some reason, then wait for it. If we left it undefined, a forking
77 * dbus-daemon would get the parent process reparented to init and reaped
78 * when the intermediate parent terminated, and a non-forking dbus-daemon
79 * would get reparented to init and carry on there.
81 * myapp is exec'd by the process that initially ran main() so that it's
82 * the shell's child, so the shell knows how to do job control and stuff.
83 * This is desirable for the "dbus-launch an application" use-case, less so
84 * for the "dbus-launch a test suite in an isolated session" use-case.
87 static char* machine_uuid = NULL;
90 get_machine_uuid (void)
96 save_machine_uuid (const char *uuid_arg)
98 if (strlen (uuid_arg) != 32)
100 fprintf (stderr, "machine ID '%s' looks like it's the wrong length, should be 32 hex digits",
105 machine_uuid = xstrdup (uuid_arg);
108 #ifdef DBUS_BUILD_X11
109 #define UUID_MAXLEN 40
110 /* Read the machine uuid from file if needed. Returns TRUE if machine_uuid is
111 * set after this function */
113 read_machine_uuid_if_needed (void)
116 char uuid[UUID_MAXLEN];
120 if (machine_uuid != NULL)
123 f = fopen (DBUS_MACHINE_UUID_FILE, "r");
127 if (fgets (uuid, UUID_MAXLEN, f) == NULL)
134 /* rstrip the read uuid */
135 while (len > 31 && isspace(uuid[len - 1]))
142 machine_uuid = xstrdup (uuid);
143 verbose ("UID: %s\n", machine_uuid);
150 #endif /* DBUS_BUILD_X11 */
153 verbose (const char *format,
156 #ifdef DBUS_ENABLE_VERBOSE_MODE
158 static int verbose = TRUE;
159 static int verbose_initted = FALSE;
161 /* things are written a bit oddly here so that
162 * in the non-verbose case we just have the one
163 * conditional and return immediately.
168 if (!verbose_initted)
170 verbose = getenv ("DBUS_VERBOSE") != NULL;
171 verbose_initted = TRUE;
176 fprintf (stderr, "%lu: ", (unsigned long) getpid ());
178 va_start (args, format);
179 vfprintf (stderr, format, args);
181 #endif /* DBUS_ENABLE_VERBOSE_MODE */
187 fprintf (stderr, "dbus-launch [--version] [--help] [--sh-syntax]"
188 " [--csh-syntax] [--auto-syntax] [--binary-syntax] [--close-stderr]"
189 " [--exit-with-session] [--autolaunch=MACHINEID]"
190 " [--config-file=FILENAME] [PROGRAM] [ARGS...]\n");
197 printf ("D-Bus Message Bus Launcher %s\n"
198 "Copyright (C) 2003 Red Hat, Inc.\n"
199 "This is free software; see the source for copying conditions.\n"
200 "There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n",
206 xstrdup (const char *str)
216 copy = malloc (len + 1);
220 memcpy (copy, str, len + 1);
227 READ_STATUS_OK, /**< Read succeeded */
228 READ_STATUS_ERROR, /**< Some kind of error */
229 READ_STATUS_EOF /**< EOF returned */
240 memset (buf, '\0', maxlen);
241 maxlen -= 1; /* ensure nul term */
243 retval = READ_STATUS_OK;
251 to_read = maxlen - bytes;
259 if (chunk < 0 && errno == EINTR)
264 retval = READ_STATUS_ERROR;
269 retval = READ_STATUS_EOF;
276 if (retval == READ_STATUS_EOF &&
278 retval = READ_STATUS_OK;
281 if (retval != READ_STATUS_ERROR &&
283 buf[bytes-1] == '\n')
296 retval = READ_STATUS_OK;
304 to_read = sizeof (pid_t) - bytes;
310 ((char*)buf) + bytes,
312 if (chunk < 0 && errno == EINTR)
317 retval = READ_STATUS_ERROR;
322 retval = READ_STATUS_EOF;
333 do_write (int fd, const void *buf, size_t count)
335 size_t bytes_written;
342 ret = write (fd, ((const char*)buf) + bytes_written, count - bytes_written);
350 fprintf (stderr, "Failed to write data to pipe! %s\n",
352 exit (1); /* give up, we suck */
356 bytes_written += ret;
358 if (bytes_written < count)
366 do_write (fd, &pid, sizeof (pid));
370 do_waitpid (pid_t pid)
375 ret = waitpid (pid, NULL, 0);
384 static pid_t bus_pid_to_kill = -1;
389 verbose ("Killing message bus and exiting babysitter\n");
390 kill (bus_pid_to_kill, SIGTERM);
392 kill (bus_pid_to_kill, SIGKILL);
396 kill_bus_and_exit (int exitcode)
398 /* in case these point to any NFS mounts, get rid of them immediately */
409 print_variables (const char *bus_address, pid_t bus_pid, long bus_wid,
410 int c_shell_syntax, int bourne_shell_syntax,
415 do_write (1, bus_address, strlen (bus_address) + 1);
416 do_write (1, &bus_pid, sizeof bus_pid);
417 do_write (1, &bus_wid, sizeof bus_wid);
420 else if (c_shell_syntax)
422 printf ("setenv DBUS_SESSION_BUS_ADDRESS '%s';\n", bus_address);
423 printf ("set DBUS_SESSION_BUS_PID=%ld;\n", (long) bus_pid);
425 printf ("set DBUS_SESSION_BUS_WINDOWID=%ld;\n", (long) bus_wid);
428 else if (bourne_shell_syntax)
430 printf ("DBUS_SESSION_BUS_ADDRESS='%s';\n", bus_address);
431 printf ("export DBUS_SESSION_BUS_ADDRESS;\n");
432 printf ("DBUS_SESSION_BUS_PID=%ld;\n", (long) bus_pid);
434 printf ("DBUS_SESSION_BUS_WINDOWID=%ld;\n", (long) bus_wid);
439 printf ("DBUS_SESSION_BUS_ADDRESS=%s\n", bus_address);
440 printf ("DBUS_SESSION_BUS_PID=%ld\n", (long) bus_pid);
442 printf ("DBUS_SESSION_BUS_WINDOWID=%ld\n", (long) bus_wid);
447 static int got_sighup = FALSE;
450 signal_handler (int sig)
465 kill_bus_when_session_ends (void)
471 struct sigaction act;
474 /* install SIGHUP handler */
476 sigemptyset (&empty_mask);
477 act.sa_handler = signal_handler;
478 act.sa_mask = empty_mask;
480 sigaction (SIGHUP, &act, NULL);
481 sigaction (SIGTERM, &act, NULL);
482 sigaction (SIGINT, &act, NULL);
484 #ifdef DBUS_BUILD_X11
486 if (xdisplay != NULL)
488 x_fd = ConnectionNumber (xdisplay);
503 verbose ("session lifetime is defined by X, not monitoring stdin\n");
506 else if (tty_fd >= 0)
508 verbose ("stdin isatty(), monitoring it\n");
512 verbose ("stdin was not a TTY, not monitoring it\n");
515 if (tty_fd < 0 && x_fd < 0)
517 fprintf (stderr, "No terminal on standard input and no X display; cannot attach message bus to session lifetime\n");
523 #ifdef DBUS_BUILD_X11
524 /* Dump events on the floor, and let
525 * IO error handler run if we lose
526 * the X connection. It's important to
527 * run this before going into select() since
528 * we might have queued outgoing messages or
539 FD_SET (tty_fd, &read_set);
540 FD_SET (tty_fd, &err_set);
545 FD_SET (x_fd, &read_set);
546 FD_SET (x_fd, &err_set);
549 select (MAX (tty_fd, x_fd) + 1,
550 &read_set, NULL, &err_set, NULL);
554 verbose ("Got SIGHUP, exiting\n");
555 kill_bus_and_exit (0);
558 #ifdef DBUS_BUILD_X11
559 /* Events will be processed before we select again
562 verbose ("X fd condition reading = %d error = %d\n",
563 FD_ISSET (x_fd, &read_set),
564 FD_ISSET (x_fd, &err_set));
569 if (FD_ISSET (tty_fd, &read_set))
574 verbose ("TTY ready for reading\n");
576 bytes_read = read (tty_fd, discard, sizeof (discard));
578 verbose ("Read %d bytes from TTY errno = %d\n",
582 kill_bus_and_exit (0); /* EOF */
583 else if (bytes_read < 0 && errno != EINTR)
585 /* This shouldn't happen I don't think; to avoid
586 * spinning on the fd forever we exit.
588 fprintf (stderr, "dbus-launch: error reading from stdin: %s\n",
590 kill_bus_and_exit (0);
593 else if (FD_ISSET (tty_fd, &err_set))
595 verbose ("TTY has error condition\n");
597 kill_bus_and_exit (0);
604 babysit (int exit_with_session,
606 int read_bus_pid_fd) /* read pid from here */
612 verbose ("babysitting, exit_with_session = %d, child_pid = %ld, read_bus_pid_fd = %d\n",
613 exit_with_session, (long) child_pid, read_bus_pid_fd);
615 /* We chdir ("/") since we are persistent and daemon-like, and fork
616 * again so dbus-launch can reap the parent. However, we don't
617 * setsid() or close fd 0 because the idea is to remain attached
618 * to the tty and the X server in order to kill the message bus
619 * when the session ends.
624 fprintf (stderr, "Could not change to root directory: %s\n",
629 /* Close stdout/stderr so we don't block an "eval" or otherwise
630 * lock up. stdout is still chaining through to dbus-launch
631 * and in turn to the parent shell.
633 dev_null_fd = open ("/dev/null", O_RDWR);
634 if (dev_null_fd >= 0)
636 if (!exit_with_session)
637 dup2 (dev_null_fd, 0);
638 dup2 (dev_null_fd, 1);
639 s = getenv ("DBUS_DEBUG_OUTPUT");
640 if (s == NULL || *s == '\0')
641 dup2 (dev_null_fd, 2);
646 fprintf (stderr, "Failed to open /dev/null: %s\n",
648 /* continue, why not */
655 fprintf (stderr, "fork() failed in babysitter: %s\n",
662 /* Parent reaps pre-fork part of bus daemon, then exits and is
663 * reaped so the babysitter isn't a zombie
666 verbose ("=== Babysitter's intermediate parent continues again\n");
668 if (do_waitpid (child_pid) < 0)
670 /* shouldn't happen */
671 fprintf (stderr, "Failed waitpid() waiting for bus daemon's parent\n");
675 verbose ("Babysitter's intermediate parent exiting\n");
680 /* Child continues */
681 verbose ("=== Babysitter process created\n");
683 verbose ("Reading PID from bus\n");
685 switch (read_pid (read_bus_pid_fd, &bus_pid_to_kill))
689 case READ_STATUS_EOF:
690 fprintf (stderr, "EOF in dbus-launch reading PID from bus daemon\n");
693 case READ_STATUS_ERROR:
694 fprintf (stderr, "Error in dbus-launch reading PID from bus daemon: %s\n",
700 verbose ("Got PID %ld from daemon\n",
701 (long) bus_pid_to_kill);
703 if (exit_with_session)
705 /* Bus is now started and launcher has needed info;
706 * we connect to X display and tty and wait to
707 * kill bus if requested.
710 kill_bus_when_session_ends ();
713 verbose ("Babysitter exiting\n");
719 do_close_stderr (void)
725 /* dbus-launch is a Unix-only program, so we can rely on /dev/null being there.
726 * We're including unistd.h and we're dealing with sh/csh launch sequences...
728 fd = open ("/dev/null", O_RDWR);
731 fprintf (stderr, "Internal error: cannot open /dev/null: %s", strerror (errno));
736 if (dup2 (fd, 2) == -1)
738 /* error; we can't report an error anymore... */
745 pass_info (const char *runprog, const char *bus_address, pid_t bus_pid,
746 long bus_wid, int c_shell_syntax, int bourne_shell_syntax,
748 int argc, char **argv, int remaining_args)
757 envvar = malloc (strlen ("DBUS_SESSION_BUS_ADDRESS=") +
758 strlen (bus_address) + 1);
759 args = malloc (sizeof (char *) * ((argc-remaining_args)+2));
761 if (envvar == NULL || args == NULL)
764 args[0] = xstrdup (runprog);
767 for (i = 1; i <= (argc-remaining_args); i++)
769 size_t len = strlen (argv[remaining_args+i-1])+1;
770 args[i] = malloc (len);
773 strncpy (args[i], argv[remaining_args+i-1], len);
777 strcpy (envvar, "DBUS_SESSION_BUS_ADDRESS=");
778 strcat (envvar, bus_address);
781 execvp (runprog, args);
782 fprintf (stderr, "Couldn't exec %s: %s\n", runprog, strerror (errno));
787 print_variables (bus_address, bus_pid, bus_wid, c_shell_syntax,
788 bourne_shell_syntax, binary_syntax);
790 verbose ("dbus-launch exiting\n");
804 fprintf (stderr, "Out of memory!");
812 main (int argc, char **argv)
814 const char *prev_arg;
816 const char *runprog = NULL;
817 int remaining_args = 0;
818 int exit_with_session;
819 int binary_syntax = FALSE;
820 int c_shell_syntax = FALSE;
821 int bourne_shell_syntax = FALSE;
822 int auto_shell_syntax = FALSE;
823 int autolaunch = FALSE;
824 int requires_arg = FALSE;
825 int close_stderr = FALSE;
828 int bus_pid_to_launcher_pipe[2];
829 int bus_pid_to_babysitter_pipe[2];
830 int bus_address_to_launcher_pipe[2];
833 exit_with_session = FALSE;
840 const char *arg = argv[i];
842 if (strcmp (arg, "--help") == 0 ||
843 strcmp (arg, "-h") == 0 ||
844 strcmp (arg, "-?") == 0)
846 else if (strcmp (arg, "--auto-syntax") == 0)
847 auto_shell_syntax = TRUE;
848 else if (strcmp (arg, "-c") == 0 ||
849 strcmp (arg, "--csh-syntax") == 0)
850 c_shell_syntax = TRUE;
851 else if (strcmp (arg, "-s") == 0 ||
852 strcmp (arg, "--sh-syntax") == 0)
853 bourne_shell_syntax = TRUE;
854 else if (strcmp (arg, "--binary-syntax") == 0)
855 binary_syntax = TRUE;
856 else if (strcmp (arg, "--version") == 0)
858 else if (strcmp (arg, "--exit-with-session") == 0)
859 exit_with_session = TRUE;
860 else if (strcmp (arg, "--close-stderr") == 0)
862 else if (strstr (arg, "--autolaunch=") == arg)
868 fprintf (stderr, "--autolaunch given twice\n");
874 s = strchr (arg, '=');
877 save_machine_uuid (s);
880 strcmp (prev_arg, "--autolaunch") == 0)
884 fprintf (stderr, "--autolaunch given twice\n");
890 save_machine_uuid (arg);
891 requires_arg = FALSE;
893 else if (strcmp (arg, "--autolaunch") == 0)
895 else if (strstr (arg, "--config-file=") == arg)
899 if (config_file != NULL)
901 fprintf (stderr, "--config-file given twice\n");
905 file = strchr (arg, '=');
908 config_file = xstrdup (file);
911 strcmp (prev_arg, "--config-file") == 0)
913 if (config_file != NULL)
915 fprintf (stderr, "--config-file given twice\n");
919 config_file = xstrdup (arg);
920 requires_arg = FALSE;
922 else if (strcmp (arg, "--config-file") == 0)
924 else if (arg[0] == '-')
926 if (strcmp (arg, "--") != 0)
928 fprintf (stderr, "Option `%s' is unknown.\n", arg);
934 remaining_args = i+2;
941 remaining_args = i+1;
951 fprintf (stderr, "Option `%s' requires an argument.\n", prev_arg);
955 if (auto_shell_syntax)
957 if ((shname = getenv ("SHELL")) != NULL)
959 if (!strncmp (shname + strlen (shname) - 3, "csh", 3))
960 c_shell_syntax = TRUE;
962 bourne_shell_syntax = TRUE;
965 bourne_shell_syntax = TRUE;
968 if (exit_with_session)
969 verbose ("--exit-with-session enabled\n");
973 #ifndef DBUS_BUILD_X11
974 fprintf (stderr, "Autolaunch requested, but X11 support not compiled in.\n"
975 "Cannot continue.\n");
977 #else /* DBUS_BUILD_X11 */
978 #ifndef DBUS_ENABLE_X11_AUTOLAUNCH
979 fprintf (stderr, "X11 autolaunch support disabled at compile time.\n");
981 #else /* DBUS_ENABLE_X11_AUTOLAUNCH */
986 if (get_machine_uuid () == NULL)
988 fprintf (stderr, "Machine UUID not provided as arg to --autolaunch\n");
992 verbose ("Autolaunch enabled (using X11).\n");
993 if (!exit_with_session)
995 verbose ("--exit-with-session automatically enabled\n");
996 exit_with_session = TRUE;
1001 fprintf (stderr, "Autolaunch error: X11 initialization failed.\n");
1005 if (!x11_get_address (&address, &pid, &wid))
1007 fprintf (stderr, "Autolaunch error: X11 communication error.\n");
1011 if (address != NULL)
1013 verbose ("dbus-daemon is already running. Returning existing parameters.\n");
1014 pass_info (runprog, address, pid, wid, c_shell_syntax,
1015 bourne_shell_syntax, binary_syntax, argc, argv, remaining_args);
1018 #endif /* DBUS_ENABLE_X11_AUTOLAUNCH */
1020 else if (read_machine_uuid_if_needed())
1023 #endif /* DBUS_BUILD_X11 */
1027 if (pipe (bus_pid_to_launcher_pipe) < 0 ||
1028 pipe (bus_address_to_launcher_pipe) < 0 ||
1029 pipe (bus_pid_to_babysitter_pipe) < 0)
1032 "Failed to create pipe: %s\n",
1040 fprintf (stderr, "Failed to fork: %s\n",
1048 #define MAX_FD_LEN 64
1049 char write_pid_fd_as_string[MAX_FD_LEN];
1050 char write_address_fd_as_string[MAX_FD_LEN];
1052 #ifdef DBUS_BUILD_X11
1059 verbose ("=== Babysitter's intermediate parent created\n");
1061 /* Fork once more to create babysitter */
1066 fprintf (stderr, "Failed to fork: %s\n",
1074 verbose ("=== Babysitter's intermediate parent continues\n");
1076 close (bus_pid_to_launcher_pipe[READ_END]);
1077 close (bus_pid_to_launcher_pipe[WRITE_END]);
1078 close (bus_address_to_launcher_pipe[READ_END]);
1079 close (bus_address_to_launcher_pipe[WRITE_END]);
1080 close (bus_pid_to_babysitter_pipe[WRITE_END]);
1082 /* babysit() will fork *again*
1083 * and will also reap the pre-forked bus
1086 babysit (exit_with_session, ret,
1087 bus_pid_to_babysitter_pipe[READ_END]);
1091 verbose ("=== Bus exec process created\n");
1093 /* Now we are the bus process (well, almost;
1094 * dbus-daemon itself forks again)
1096 close (bus_pid_to_launcher_pipe[READ_END]);
1097 close (bus_address_to_launcher_pipe[READ_END]);
1098 close (bus_pid_to_babysitter_pipe[READ_END]);
1099 close (bus_pid_to_babysitter_pipe[WRITE_END]);
1101 sprintf (write_pid_fd_as_string,
1102 "%d", bus_pid_to_launcher_pipe[WRITE_END]);
1104 sprintf (write_address_fd_as_string,
1105 "%d", bus_address_to_launcher_pipe[WRITE_END]);
1107 verbose ("Calling exec()\n");
1109 #ifdef DBUS_BUILD_TESTS
1110 /* exec from testdir */
1111 if (getenv("DBUS_USE_TEST_BINARY") != NULL)
1113 execl (TEST_BUS_BINARY,
1116 "--print-pid", write_pid_fd_as_string,
1117 "--print-address", write_address_fd_as_string,
1118 config_file ? "--config-file" : "--session",
1119 config_file, /* has to be last in this varargs list */
1123 "Failed to execute test message bus daemon %s: %s. Will try again with the system path.\n",
1124 TEST_BUS_BINARY, strerror (errno));
1126 #endif /* DBUS_BUILD_TESTS */
1128 execl (DBUS_DAEMONDIR"/dbus-daemon",
1129 DBUS_DAEMONDIR"/dbus-daemon",
1131 "--print-pid", write_pid_fd_as_string,
1132 "--print-address", write_address_fd_as_string,
1133 config_file ? "--config-file" : "--session",
1134 config_file, /* has to be last in this varargs list */
1138 "Failed to execute message bus daemon %s: %s. Will try again without full path.\n",
1139 DBUS_DAEMONDIR"/dbus-daemon", strerror (errno));
1142 * If it failed, try running without full PATH. Note this is needed
1143 * because the build process builds the run-with-tmp-session-bus.conf
1144 * file and the dbus-daemon will not be in the install location during
1147 execlp ("dbus-daemon",
1150 "--print-pid", write_pid_fd_as_string,
1151 "--print-address", write_address_fd_as_string,
1152 config_file ? "--config-file" : "--session",
1153 config_file, /* has to be last in this varargs list */
1157 "Failed to execute message bus daemon: %s\n",
1164 #define MAX_PID_LEN 64
1166 char bus_address[MAX_ADDR_LEN];
1167 char buf[MAX_PID_LEN];
1172 verbose ("=== Parent dbus-launch continues\n");
1174 close (bus_pid_to_launcher_pipe[WRITE_END]);
1175 close (bus_address_to_launcher_pipe[WRITE_END]);
1176 close (bus_pid_to_babysitter_pipe[READ_END]);
1178 verbose ("Waiting for babysitter's intermediate parent\n");
1180 /* Immediately reap parent of babysitter
1181 * (which was created just for us to reap)
1183 if (do_waitpid (ret) < 0)
1185 fprintf (stderr, "Failed to waitpid() for babysitter intermediate process: %s\n",
1190 verbose ("Reading address from bus\n");
1192 /* Read the pipe data, print, and exit */
1193 switch (read_line (bus_address_to_launcher_pipe[READ_END],
1194 bus_address, MAX_ADDR_LEN))
1196 case READ_STATUS_OK:
1198 case READ_STATUS_EOF:
1199 fprintf (stderr, "EOF in dbus-launch reading address from bus daemon\n");
1202 case READ_STATUS_ERROR:
1203 fprintf (stderr, "Error in dbus-launch reading address from bus daemon: %s\n",
1209 close (bus_address_to_launcher_pipe[READ_END]);
1211 verbose ("Reading PID from daemon\n");
1213 switch (read_line (bus_pid_to_launcher_pipe[READ_END], buf, MAX_PID_LEN))
1215 case READ_STATUS_OK:
1217 case READ_STATUS_EOF:
1218 fprintf (stderr, "EOF reading PID from bus daemon\n");
1221 case READ_STATUS_ERROR:
1222 fprintf (stderr, "Error reading PID from bus daemon: %s\n",
1229 val = strtol (buf, &end, 0);
1230 if (buf == end || end == NULL)
1232 fprintf (stderr, "Failed to parse bus PID \"%s\": %s\n",
1233 buf, strerror (errno));
1239 close (bus_pid_to_launcher_pipe[READ_END]);
1241 #ifdef DBUS_ENABLE_X11_AUTOLAUNCH
1242 if (xdisplay != NULL)
1246 verbose("Saving x11 address\n");
1247 ret2 = x11_save_address (bus_address, bus_pid, &wid);
1248 /* Only get an existing dbus session when autolaunching */
1253 char *address = NULL;
1254 /* another window got added. Return its address */
1255 bus_pid_to_kill = bus_pid;
1256 if (x11_get_address (&address, &bus_pid, &wid)
1259 verbose ("dbus-daemon is already running. Returning existing parameters.\n");
1260 /* Kill the old bus */
1262 pass_info (runprog, address, bus_pid, wid,
1263 c_shell_syntax, bourne_shell_syntax, binary_syntax,
1264 argc, argv, remaining_args);
1269 fprintf (stderr, "Error saving bus information.\n");
1270 bus_pid_to_kill = bus_pid;
1271 kill_bus_and_exit (1);
1277 /* Forward the pid to the babysitter */
1278 write_pid (bus_pid_to_babysitter_pipe[WRITE_END], bus_pid);
1279 close (bus_pid_to_babysitter_pipe[WRITE_END]);
1281 pass_info (runprog, bus_address, bus_pid, wid, c_shell_syntax,
1282 bourne_shell_syntax, binary_syntax, argc, argv, remaining_args);