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dbus/bus/main.c
Kristian Høgsberg 1919d92d85 Patch from Jon Trowbridge <trow@ximian.com>: 
* bus/main.c (setup_reload_pipe): Added.  Creates a pipe and sets
 	up a watch that triggers a config reload when one end of the pipe
 	becomes readable.
 	(signal_handler): Instead of doing the config reload in our SIGHUP
 	handler, just write to the reload pipe and let the associated
 	watch handle the reload when control returns to the main loop.

 	* bus/driver.c (bus_driver_handle_reload_config): Added.
 	Implements a ReloadConfig method for requesting a configuration
 	file reload via the bus driver.
2004-05-20 18:45:16 +00:00

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/* -*- mode: C; c-file-style: "gnu" -*- */
/* main.c main() for message bus
*
* Copyright (C) 2003 Red Hat, Inc.
*
* Licensed under the Academic Free License version 2.0
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include "bus.h"
#include <dbus/dbus-internals.h>
#include <dbus/dbus-watch.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <errno.h>
static BusContext *context;
static int reload_pipe[2];
#define RELOAD_READ_END 0
#define RELOAD_WRITE_END 1
static void
signal_handler (int sig)
{
DBusString str;
switch (sig)
{
case SIGHUP:
_dbus_string_init_const (&str, "foo");
if (!_dbus_write (reload_pipe[RELOAD_WRITE_END], &str, 0, 1))
{
_dbus_warn ("Unable to write to reload pipe.\n");
exit (1);
}
break;
case SIGTERM:
_dbus_loop_quit (bus_context_get_loop (context));
break;
}
}
static void
usage (void)
{
fprintf (stderr, "dbus-daemon-1 [--version] [--session] [--system] [--config-file=FILE] [--print-address[=DESCRIPTOR]] [--print-pid[=DESCRIPTOR]] [--fork]\n");
exit (1);
}
static void
version (void)
{
printf ("D-BUS Message Bus Daemon %s\n"
"Copyright (C) 2002, 2003 Red Hat, Inc., CodeFactory AB, and others\n"
"This is free software; see the source for copying conditions.\n"
"There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n",
VERSION);
exit (0);
}
static void
check_two_config_files (const DBusString *config_file,
const char *extra_arg)
{
if (_dbus_string_get_length (config_file) > 0)
{
fprintf (stderr, "--%s specified but configuration file %s already requested\n",
extra_arg, _dbus_string_get_const_data (config_file));
exit (1);
}
}
static void
check_two_addr_descriptors (const DBusString *addr_fd,
const char *extra_arg)
{
if (_dbus_string_get_length (addr_fd) > 0)
{
fprintf (stderr, "--%s specified but printing address to %s already requested\n",
extra_arg, _dbus_string_get_const_data (addr_fd));
exit (1);
}
}
static void
check_two_pid_descriptors (const DBusString *pid_fd,
const char *extra_arg)
{
if (_dbus_string_get_length (pid_fd) > 0)
{
fprintf (stderr, "--%s specified but printing pid to %s already requested\n",
extra_arg, _dbus_string_get_const_data (pid_fd));
exit (1);
}
}
static dbus_bool_t
handle_reload_watch (DBusWatch *watch,
unsigned int flags,
void *data)
{
DBusError error;
DBusString str;
_dbus_string_init (&str);
if (_dbus_read (reload_pipe[RELOAD_READ_END], &str, 1) != 1)
{
_dbus_warn ("Couldn't read from reload pipe.\n");
exit (1);
}
_dbus_string_free (&str);
dbus_error_init (&error);
if (! bus_context_reload_config (context, &error))
{
_dbus_warn ("Unable to reload configuration: %s\n",
error.message);
dbus_error_free (&error);
exit (1);
}
return TRUE;
}
static dbus_bool_t
reload_watch_callback (DBusWatch *watch,
unsigned int condition,
void *data)
{
return dbus_watch_handle (watch, condition);
}
static void
setup_reload_pipe (DBusLoop *loop)
{
DBusError error;
DBusWatch *watch;
dbus_error_init (&error);
if (!_dbus_full_duplex_pipe (&reload_pipe[0], &reload_pipe[1],
TRUE, &error))
{
_dbus_warn ("Unable to create reload pipe: %s\n",
error.message);
dbus_error_free (&error);
exit (1);
}
watch = _dbus_watch_new (reload_pipe[RELOAD_READ_END],
DBUS_WATCH_READABLE, TRUE,
handle_reload_watch, NULL, NULL);
if (watch == NULL)
{
_dbus_warn ("Unable to create reload watch: %s\n",
error.message);
dbus_error_free (&error);
exit (1);
}
if (!_dbus_loop_add_watch (loop, watch, reload_watch_callback,
NULL, NULL))
{
_dbus_warn ("Unable to add reload watch to main loop: %s\n",
error.message);
dbus_error_free (&error);
exit (1);
}
}
int
main (int argc, char **argv)
{
DBusError error;
DBusString config_file;
DBusString addr_fd;
DBusString pid_fd;
const char *prev_arg;
int print_addr_fd;
int print_pid_fd;
int i;
dbus_bool_t print_address;
dbus_bool_t print_pid;
dbus_bool_t force_fork;
if (!_dbus_string_init (&config_file))
return 1;
if (!_dbus_string_init (&addr_fd))
return 1;
if (!_dbus_string_init (&pid_fd))
return 1;
print_address = FALSE;
print_pid = FALSE;
force_fork = FALSE;
prev_arg = NULL;
i = 1;
while (i < argc)
{
const char *arg = argv[i];
if (strcmp (arg, "--help") == 0 ||
strcmp (arg, "-h") == 0 ||
strcmp (arg, "-?") == 0)
usage ();
else if (strcmp (arg, "--version") == 0)
version ();
else if (strcmp (arg, "--fork") == 0)
force_fork = TRUE;
else if (strcmp (arg, "--system") == 0)
{
check_two_config_files (&config_file, "system");
if (!_dbus_string_append (&config_file, DBUS_SYSTEM_CONFIG_FILE))
exit (1);
}
else if (strcmp (arg, "--session") == 0)
{
check_two_config_files (&config_file, "session");
if (!_dbus_string_append (&config_file, DBUS_SESSION_CONFIG_FILE))
exit (1);
}
else if (strstr (arg, "--config-file=") == arg)
{
const char *file;
check_two_config_files (&config_file, "config-file");
file = strchr (arg, '=');
++file;
if (!_dbus_string_append (&config_file, file))
exit (1);
}
else if (prev_arg &&
strcmp (prev_arg, "--config-file") == 0)
{
check_two_config_files (&config_file, "config-file");
if (!_dbus_string_append (&config_file, arg))
exit (1);
}
else if (strcmp (arg, "--config-file") == 0)
; /* wait for next arg */
else if (strstr (arg, "--print-address=") == arg)
{
const char *desc;
check_two_addr_descriptors (&addr_fd, "print-address");
desc = strchr (arg, '=');
++desc;
if (!_dbus_string_append (&addr_fd, desc))
exit (1);
print_address = TRUE;
}
else if (prev_arg &&
strcmp (prev_arg, "--print-address") == 0)
{
check_two_addr_descriptors (&addr_fd, "print-address");
if (!_dbus_string_append (&addr_fd, arg))
exit (1);
print_address = TRUE;
}
else if (strcmp (arg, "--print-address") == 0)
print_address = TRUE; /* and we'll get the next arg if appropriate */
else if (strstr (arg, "--print-pid=") == arg)
{
const char *desc;
check_two_pid_descriptors (&pid_fd, "print-pid");
desc = strchr (arg, '=');
++desc;
if (!_dbus_string_append (&pid_fd, desc))
exit (1);
print_pid = TRUE;
}
else if (prev_arg &&
strcmp (prev_arg, "--print-pid") == 0)
{
check_two_pid_descriptors (&pid_fd, "print-pid");
if (!_dbus_string_append (&pid_fd, arg))
exit (1);
print_pid = TRUE;
}
else if (strcmp (arg, "--print-pid") == 0)
print_pid = TRUE; /* and we'll get the next arg if appropriate */
else
usage ();
prev_arg = arg;
++i;
}
if (_dbus_string_get_length (&config_file) == 0)
{
fprintf (stderr, "No configuration file specified.\n");
usage ();
}
print_addr_fd = -1;
if (print_address)
{
print_addr_fd = 1; /* stdout */
if (_dbus_string_get_length (&addr_fd) > 0)
{
long val;
int end;
if (!_dbus_string_parse_int (&addr_fd, 0, &val, &end) ||
end != _dbus_string_get_length (&addr_fd) ||
val < 0 || val > _DBUS_INT_MAX)
{
fprintf (stderr, "Invalid file descriptor: \"%s\"\n",
_dbus_string_get_const_data (&addr_fd));
exit (1);
}
print_addr_fd = val;
}
}
print_pid_fd = -1;
if (print_pid)
{
print_pid_fd = 1; /* stdout */
if (_dbus_string_get_length (&pid_fd) > 0)
{
long val;
int end;
if (!_dbus_string_parse_int (&pid_fd, 0, &val, &end) ||
end != _dbus_string_get_length (&pid_fd) ||
val < 0 || val > _DBUS_INT_MAX)
{
fprintf (stderr, "Invalid file descriptor: \"%s\"\n",
_dbus_string_get_const_data (&pid_fd));
exit (1);
}
print_pid_fd = val;
}
}
dbus_error_init (&error);
context = bus_context_new (&config_file, force_fork,
print_addr_fd, print_pid_fd,
&error);
_dbus_string_free (&config_file);
if (context == NULL)
{
_dbus_warn ("Failed to start message bus: %s\n",
error.message);
dbus_error_free (&error);
exit (1);
}
setup_reload_pipe (bus_context_get_loop (context));
_dbus_set_signal_handler (SIGHUP, signal_handler);
_dbus_set_signal_handler (SIGTERM, signal_handler);
_dbus_verbose ("We are on D-Bus...\n");
_dbus_loop_run (bus_context_get_loop (context));
bus_context_shutdown (context);
bus_context_unref (context);
return 0;
}
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