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/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
/* inotify-helper.c - Gnome VFS Monitor based on inotify.
Copyright (C) 2005 John McCutchan
The Gnome Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The Gnome Library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the Gnome Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
Authors:
John McCutchan <john@johnmccutchan.com>
*/
#include "config.h"
#include <errno.h>
#include <time.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/inotify.h>
#include "inotify-helper.h"
#include "inotify-missing.h"
#include "inotify-path.h"
#include "inotify-diag.h"
static gboolean ih_debug_enabled = FALSE;
#define IH_W if (ih_debug_enabled) g_warning
static void ih_event_callback (ik_event_t *event, ih_sub_t *sub);
static void ih_found_callback (ih_sub_t *sub);
/* We share this lock with inotify-kernel.c and inotify-missing.c
*
* inotify-kernel.c takes the lock when it reads events from
* the kernel and when it processes those events
*
* inotify-missing.c takes the lock when it is scanning the missing
* list.
*
* We take the lock in all public functions
*/
G_LOCK_DEFINE (inotify_lock);
static GList *sub_list = NULL;
static gboolean initialized = FALSE;
static event_callback_t user_ecb = NULL;
static found_callback_t user_fcb = NULL;
/**
* Initializes the inotify backend. This must be called before
* any other functions in this module.
*
* @returns TRUE if initialization succeeded, FALSE otherwise
*/
gboolean
ih_startup (event_callback_t ecb,
found_callback_t fcb)
{
static gboolean result = FALSE;
G_LOCK(inotify_lock);
if (initialized == TRUE) {
G_UNLOCK(inotify_lock);
return result;
}
result = ip_startup (ih_event_callback);
if (!result) {
g_warning( "Could not initialize inotify\n");
G_UNLOCK(inotify_lock);
return FALSE;
}
initialized = TRUE;
user_ecb = ecb;
user_fcb = fcb;
im_startup (ih_found_callback);
id_startup ();
IH_W ("started gnome-vfs inotify backend\n");
G_UNLOCK(inotify_lock);
return TRUE;
}
gboolean
ih_running (void)
{
return initialized;
}
/**
* Adds a subscription to be monitored.
*/
gboolean
ih_sub_add (ih_sub_t * sub)
{
G_LOCK(inotify_lock);
g_assert (g_list_find (sub_list, sub) == NULL);
// make sure that sub isn't on sub_list first.
if (!ip_start_watching (sub))
{
im_add (sub);
}
sub_list = g_list_prepend (sub_list, sub);
G_UNLOCK(inotify_lock);
return TRUE;
}
/**
* Cancels a subscription which was being monitored.
* inotify_lock must be held when calling.
*/
static gboolean
ih_sub_cancel (ih_sub_t * sub)
{
if (!sub->cancelled)
{
IH_W("cancelling %s\n", sub->pathname);
g_assert (g_list_find (sub_list, sub) != NULL);
sub->cancelled = TRUE;
im_rm (sub);
ip_stop_watching (sub);
sub_list = g_list_remove (sub_list, sub);
}
return TRUE;
}
static void
ih_sub_foreach_worker (void *callerdata, gboolean (*f)(ih_sub_t *sub, void *callerdata), gboolean free)
{
GList *l = NULL;
GList *next = NULL;
G_LOCK(inotify_lock);
for (l = sub_list; l; l = next)
{
ih_sub_t *sub = l->data;
next = l->next;
if (f(sub, callerdata))
{
ih_sub_cancel (sub); /* Removes sub from sub_list */
if (free)
ih_sub_free (sub);
}
}
G_UNLOCK(inotify_lock);
}
void
ih_sub_foreach (void *callerdata, gboolean (*f)(ih_sub_t *sub, void *callerdata))
{
ih_sub_foreach_worker (callerdata, f, FALSE);
}
void
ih_sub_foreach_free (void *callerdata, gboolean (*f)(ih_sub_t *sub, void *callerdata))
{
ih_sub_foreach_worker (callerdata, f, TRUE);
}
static void ih_event_callback (ik_event_t *event, ih_sub_t *sub)
{
gchar *fullpath;
if (event->name)
{
fullpath = g_strdup_printf ("%s/%s", sub->dirname, event->name);
} else {
fullpath = g_strdup_printf ("%s/", sub->dirname);
}
user_ecb (fullpath, event->mask, sub->usersubdata);
g_free(fullpath);
}
static void ih_found_callback (ih_sub_t *sub)
{
gchar *fullpath;
if (sub->filename)
{
fullpath = g_strdup_printf ("%s/%s", sub->dirname, sub->filename);
if (!g_file_test (fullpath, G_FILE_TEST_EXISTS)) {
g_free (fullpath);
return;
}
} else {
fullpath = g_strdup_printf ("%s/", sub->dirname);
}
user_fcb (fullpath, sub->usersubdata);
g_free(fullpath);
}
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