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/* -*- mode: C; c-file-style: "gnu" -*- */
/* dir-watch-inotify.c OS specific directory change notification for message bus
*
* Copyright (C) 2003 Red Hat, Inc.
* (c) 2006 Mandriva
*
* Licensed under the Academic Free License version 2.1
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#include <config.h>
#define _GNU_SOURCE
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/inotify.h>
#include <sys/types.h>
#include <signal.h>
#include <errno.h>
#include <dbus/dbus-internals.h>
#include <dbus/dbus-watch.h>
#include "dir-watch.h"
#define MAX_DIRS_TO_WATCH 128
#define INOTIFY_EVENT_SIZE (sizeof(struct inotify_event))
#define INOTIFY_BUF_LEN (1024 * (INOTIFY_EVENT_SIZE + 16))
/* use a static array to avoid handling OOM */
static int wds[MAX_DIRS_TO_WATCH];
static int num_wds = 0;
static int inotify_fd = -1;
static DBusWatch *watch = NULL;
static DBusLoop *loop = NULL;
static dbus_bool_t
_inotify_watch_callback (DBusWatch *watch, unsigned int condition, void *data)
{
return dbus_watch_handle (watch, condition);
}
static dbus_bool_t
_handle_inotify_watch (DBusWatch *passed_watch, unsigned int flags, void *data)
{
char buffer[INOTIFY_BUF_LEN];
ssize_t ret = 0;
int i = 0;
pid_t pid;
dbus_bool_t have_change = FALSE;
ret = read (inotify_fd, buffer, INOTIFY_BUF_LEN);
if (ret < 0)
_dbus_verbose ("Error reading inotify event: '%s'\n", _dbus_strerror(errno));
else if (!ret)
_dbus_verbose ("Error reading inotify event: buffer too small\n");
while (i < ret)
{
struct inotify_event *ev;
pid = _dbus_getpid ();
ev = (struct inotify_event *) &buffer[i];
i += INOTIFY_EVENT_SIZE + ev->len;
#ifdef DBUS_ENABLE_VERBOSE_MODE
if (ev->len)
_dbus_verbose ("event name: '%s'\n", ev->name);
_dbus_verbose ("inotify event: wd=%d mask=%u cookie=%u len=%u\n", ev->wd, ev->mask, ev->cookie, ev->len);
#endif
_dbus_verbose ("Sending SIGHUP signal on reception of a inotify event\n");
have_change = TRUE;
}
if (have_change)
(void) kill (pid, SIGHUP);
return TRUE;
}
void
bus_watch_directory (const char *dir, BusContext *context)
{
int wd;
_dbus_assert (dir != NULL);
if (inotify_fd == -1) {
#ifdef HAVE_INOTIFY_INIT1
inotify_fd = inotify_init1 (IN_CLOEXEC);
#else
inotify_fd = inotify_init ();
#endif
if (inotify_fd <= 0) {
_dbus_warn ("Cannot initialize inotify\n");
goto out;
}
loop = bus_context_get_loop (context);
watch = _dbus_watch_new (inotify_fd, DBUS_WATCH_READABLE, TRUE,
_handle_inotify_watch, NULL, NULL);
if (watch == NULL)
{
_dbus_warn ("Unable to create inotify watch\n");
goto out;
}
if (!_dbus_loop_add_watch (loop, watch, _inotify_watch_callback,
NULL, NULL))
{
_dbus_warn ("Unable to add reload watch to main loop");
_dbus_watch_unref (watch);
watch = NULL;
goto out;
}
}
if (num_wds >= MAX_DIRS_TO_WATCH )
{
_dbus_warn ("Cannot watch config directory '%s'. Already watching %d directories\n", dir, MAX_DIRS_TO_WATCH);
goto out;
}
wd = inotify_add_watch (inotify_fd, dir, IN_CLOSE_WRITE | IN_DELETE | IN_MOVED_TO | IN_MOVED_FROM);
if (wd < 0)
{
_dbus_warn ("Cannot setup inotify for '%s'; error '%s'\n", dir, _dbus_strerror (errno));
goto out;
}
wds[num_wds++] = wd;
_dbus_verbose ("Added watch on config directory '%s'\n", dir);
out:
;
}
void
bus_drop_all_directory_watches (void)
{
int ret;
if (watch != NULL)
{
_dbus_loop_remove_watch (loop, watch, _inotify_watch_callback, NULL);
_dbus_watch_unref (watch);
watch = NULL;
}
_dbus_verbose ("Dropping all watches on config directories\n");
ret = close (inotify_fd);
if (ret)
_dbus_verbose ("Error dropping watches: '%s'\n", _dbus_strerror(errno));
num_wds = 0;
inotify_fd = -1;
}
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