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/* -*- mode: C; c-file-style: "gnu" -*- */
/* dir-watch.c OS specific directory change notification for message bus
*
* Copyright (C) 2003 Red Hat, Inc.
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <config.h>
#ifdef DBUS_BUS_ENABLE_DNOTIFY_ON_LINUX
#define _GNU_SOURCE
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#endif /* DBUS_BUS_ENABLE_DNOTIFY_ON_LINUX */
#include <dbus/dbus-internals.h>
#include "dir-watch.h"
/* D_NOTIFY is available on Linux 2.4 or greater - the actual SIGIO signal is handled in main.c:signal_handler() */
#ifdef DBUS_BUS_ENABLE_DNOTIFY_ON_LINUX
#define MAX_DIRS_TO_WATCH 128
/* use a static array to avoid handling OOM */
static int fds[MAX_DIRS_TO_WATCH];
static int num_fds = 0;
void
bus_watch_directory (const char *dir, void *userdata)
{
int fd;
_dbus_assert (dir != NULL);
if (num_fds >= MAX_DIRS_TO_WATCH )
{
_dbus_warn ("Cannot watch config directory '%s'. Already watching %d directories\n", dir, MAX_DIRS_TO_WATCH);
goto out;
}
fd = open (dir, O_RDONLY);
if (fd < 0)
{
_dbus_warn ("Cannot open directory '%s'; error '%s'\n", dir, _dbus_strerror (errno));
goto out;
}
if (fcntl (fd, F_NOTIFY, DN_DELETE|DN_RENAME|DN_MODIFY) == -1)
{
_dbus_warn ("Cannot setup D_NOTIFY for '%s' error '%s'\n", dir, _dbus_strerror (errno));
close (fd);
goto out;
}
fds[num_fds++] = fd;
_dbus_verbose ("Added watch on config directory '%s'\n", dir);
out:
;
}
void
bus_drop_all_directory_watches (void)
{
_dbus_verbose ("Dropping all watches on config directories\n");
int i;
for (i = 0; i < num_fds; i++)
{
if (close (fds[i]) != 0)
{
_dbus_verbose ("Error closing fd %d for config directory watch\n", fds[i]);
}
}
num_fds = 0;
}
#else /* fallback to NOP */
void
bus_drop_all_directory_watches (void)
{
}
void
bus_watch_directory (const char *dir, void *userdata)
{
}
#endif
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