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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */
/* NetworkManager system settings service
*
* 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.
*
* (C) Copyright 2008 Red Hat, Inc.
*/
#include <unistd.h>
#include <string.h>
#include <sys/inotify.h>
#include <glib.h>
#include "nm-inotify-helper.h"
#include "nm-logging.h"
/* NOTE: this code should be killed once we depend on a new enough glib to
* include the patches from https://bugzilla.gnome.org/show_bug.cgi?id=532815
*/
G_DEFINE_TYPE (NMInotifyHelper, nm_inotify_helper, G_TYPE_OBJECT)
#define NM_INOTIFY_HELPER_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), NM_TYPE_INOTIFY_HELPER, NMInotifyHelperPrivate))
typedef struct {
int ifd;
GHashTable *wd_refs;
} NMInotifyHelperPrivate;
/* Signals */
enum {
EVENT,
LAST_SIGNAL
};
static guint signals[LAST_SIGNAL] = { 0 };
int
nm_inotify_helper_add_watch (NMInotifyHelper *self, const char *path)
{
NMInotifyHelperPrivate *priv = NM_INOTIFY_HELPER_GET_PRIVATE (self);
int wd;
guint32 refcount;
g_return_val_if_fail (priv->ifd >= 0, -1);
/* We only care about modifications since we're just trying to get change
* notifications on hardlinks.
*/
wd = inotify_add_watch (priv->ifd, path, IN_CLOSE_WRITE);
if (wd < 0)
return -1;
refcount = GPOINTER_TO_UINT (g_hash_table_lookup (priv->wd_refs, GINT_TO_POINTER (wd)));
refcount++;
g_hash_table_replace (priv->wd_refs, GINT_TO_POINTER (wd), GUINT_TO_POINTER (refcount));
return wd;
}
void
nm_inotify_helper_remove_watch (NMInotifyHelper *self, int wd)
{
NMInotifyHelperPrivate *priv = NM_INOTIFY_HELPER_GET_PRIVATE (self);
guint32 refcount;
g_return_if_fail (priv->ifd >= 0);
refcount = GPOINTER_TO_UINT (g_hash_table_lookup (priv->wd_refs, GINT_TO_POINTER (wd)));
if (!refcount)
return;
refcount--;
if (!refcount) {
g_hash_table_remove (priv->wd_refs, GINT_TO_POINTER (wd));
inotify_rm_watch (priv->ifd, wd);
} else
g_hash_table_replace (priv->wd_refs, GINT_TO_POINTER (wd), GUINT_TO_POINTER (refcount));
}
static gboolean
inotify_event_handler (GIOChannel *channel, GIOCondition cond, gpointer user_data)
{
NMInotifyHelper *self = NM_INOTIFY_HELPER (user_data);
struct inotify_event evt;
/* read the notifications from the watch descriptor */
while (g_io_channel_read_chars (channel, (gchar *) &evt, sizeof (struct inotify_event), NULL, NULL) == G_IO_STATUS_NORMAL) {
gchar filename[PATH_MAX + 1];
filename[0] = '\0';
if (evt.len > 0) {
g_io_channel_read_chars (channel,
filename,
evt.len > PATH_MAX ? PATH_MAX : evt.len,
NULL, NULL);
}
if (!(evt.mask & IN_IGNORED))
g_signal_emit (self, signals[EVENT], 0, &evt, &filename[0]);
}
return TRUE;
}
static gboolean
init_inotify (NMInotifyHelper *self)
{
NMInotifyHelperPrivate *priv = NM_INOTIFY_HELPER_GET_PRIVATE (self);
GIOChannel *channel;
guint source_id;
priv->ifd = inotify_init ();
if (priv->ifd == -1) {
nm_log_warn (LOGD_SETTINGS, "couldn't initialize inotify");
return FALSE;
}
/* Watch the inotify descriptor for file/directory change events */
channel = g_io_channel_unix_new (priv->ifd);
g_io_channel_set_flags (channel, G_IO_FLAG_NONBLOCK, NULL);
g_io_channel_set_encoding (channel, NULL, NULL);
source_id = g_io_add_watch (channel,
G_IO_IN | G_IO_ERR,
(GIOFunc) inotify_event_handler,
(gpointer) self);
g_io_channel_unref (channel);
return TRUE;
}
NMInotifyHelper *
nm_inotify_helper_get (void)
{
static NMInotifyHelper *singleton = NULL;
if (!singleton) {
singleton = (NMInotifyHelper *) g_object_new (NM_TYPE_INOTIFY_HELPER, NULL);
if (!init_inotify (singleton)) {
g_clear_object (&singleton);
return NULL;
}
} else
g_object_ref (singleton);
g_assert (singleton);
return singleton;
}
static void
nm_inotify_helper_init (NMInotifyHelper *self)
{
NMInotifyHelperPrivate *priv = NM_INOTIFY_HELPER_GET_PRIVATE (self);
priv->wd_refs = g_hash_table_new (g_direct_hash, g_direct_equal);
}
static void
finalize (GObject *object)
{
NMInotifyHelperPrivate *priv = NM_INOTIFY_HELPER_GET_PRIVATE (object);
if (priv->ifd >= 0)
close (priv->ifd);
g_hash_table_destroy (priv->wd_refs);
G_OBJECT_CLASS (nm_inotify_helper_parent_class)->finalize (object);
}
static void
nm_inotify_helper_class_init (NMInotifyHelperClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
g_type_class_add_private (klass, sizeof (NMInotifyHelperPrivate));
/* Virtual methods */
object_class->finalize = finalize;
/* Signals */
signals[EVENT] =
g_signal_new ("event",
G_OBJECT_CLASS_TYPE (object_class),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (NMInotifyHelperClass, event),
NULL, NULL, NULL,
G_TYPE_NONE, 2, G_TYPE_POINTER, G_TYPE_STRING);
}
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