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/*
*
* Connection Manager
*
* Copyright (C) 2007-2012 Intel Corporation. All rights reserved.
* Copyright (C) 2012 BMW Car IT GmbH. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* 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 St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <errno.h>
#include <unistd.h>
#include <sys/stat.h>
#include <dirent.h>
#include <sys/inotify.h>
#include <connman/storage.h>
#include "connman.h"
struct connman_inotify {
GIOChannel *channel;
uint watch;
int wd;
GSList *list;
};
static GHashTable *inotify_hash;
static gboolean inotify_data(GIOChannel *channel, GIOCondition cond,
gpointer user_data)
{
struct connman_inotify *inotify = user_data;
char buffer[256];
char *next_event;
gsize bytes_read;
GIOStatus status;
GSList *list;
if (cond & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
inotify->watch = 0;
return FALSE;
}
status = g_io_channel_read_chars(channel, buffer,
sizeof(buffer) -1, &bytes_read, NULL);
switch (status) {
case G_IO_STATUS_NORMAL:
break;
case G_IO_STATUS_AGAIN:
return TRUE;
default:
connman_error("Reading from inotify channel failed");
inotify->watch = 0;
return FALSE;
}
next_event = buffer;
while (bytes_read > 0) {
struct inotify_event *event;
gchar *ident;
gsize len;
event = (struct inotify_event *) next_event;
if (event->len)
ident = next_event + sizeof(struct inotify_event);
else
ident = NULL;
len = sizeof(struct inotify_event) + event->len;
/* check if inotify_event block fit */
if (len > bytes_read)
break;
next_event += len;
bytes_read -= len;
for (list = inotify->list; list != NULL; list = list->next) {
inotify_event_cb callback = list->data;
(*callback)(event, ident);
}
}
return TRUE;
}
static int create_watch(const char *path, struct connman_inotify *inotify)
{
int fd;
DBG("Add directory watch for %s", path);
fd = inotify_init();
if (fd < 0)
return -EIO;
inotify->wd = inotify_add_watch(fd, path,
IN_MODIFY | IN_CREATE | IN_DELETE |
IN_MOVED_TO | IN_MOVED_FROM);
if (inotify->wd < 0) {
connman_error("Creation of %s watch failed", path);
close(fd);
return -EIO;
}
inotify->channel = g_io_channel_unix_new(fd);
if (inotify->channel == NULL) {
connman_error("Creation of inotify channel failed");
inotify_rm_watch(fd, inotify->wd);
inotify->wd = 0;
close(fd);
return -EIO;
}
g_io_channel_set_close_on_unref(inotify->channel, TRUE);
g_io_channel_set_encoding(inotify->channel, NULL, NULL);
g_io_channel_set_buffered(inotify->channel, FALSE);
inotify->watch = g_io_add_watch(inotify->channel,
G_IO_IN | G_IO_HUP | G_IO_NVAL | G_IO_ERR,
inotify_data, inotify);
return 0;
}
static void remove_watch(struct connman_inotify *inotify)
{
int fd;
if (inotify->channel == NULL)
return;
if (inotify->watch > 0)
g_source_remove(inotify->watch);
fd = g_io_channel_unix_get_fd(inotify->channel);
if (inotify->wd >= 0)
inotify_rm_watch(fd, inotify->wd);
g_io_channel_unref(inotify->channel);
}
int connman_inotify_register(const char *path, inotify_event_cb callback)
{
struct connman_inotify *inotify;
int err;
if (callback == NULL)
return -EINVAL;
inotify = g_hash_table_lookup(inotify_hash, path);
if (inotify != NULL)
goto update;
inotify = g_try_new0(struct connman_inotify, 1);
if (inotify == NULL)
return -ENOMEM;
inotify->wd = -1;
err = create_watch(path, inotify);
if (err < 0) {
g_free(inotify);
return err;
}
g_hash_table_replace(inotify_hash, g_strdup(path), inotify);
update:
inotify->list = g_slist_prepend(inotify->list, callback);
return 0;
}
static void cleanup_inotify(gpointer user_data)
{
struct connman_inotify *inotify = user_data;
g_slist_free(inotify->list);
remove_watch(inotify);
g_free(inotify);
}
void connman_inotify_unregister(const char *path, inotify_event_cb callback)
{
struct connman_inotify *inotify;
inotify = g_hash_table_lookup(inotify_hash, path);
if (inotify == NULL)
return;
inotify->list = g_slist_remove(inotify->list, callback);
if (inotify->list != NULL)
return;
g_hash_table_remove(inotify_hash, path);
}
int __connman_inotify_init(void)
{
DBG("");
inotify_hash = g_hash_table_new_full(g_str_hash, g_str_equal,
g_free, cleanup_inotify);
return 0;
}
void __connman_inotify_cleanup(void)
{
DBG("");
g_hash_table_destroy(inotify_hash);
}
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