glib/gio/fam/fam-helper.c

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/* GIO - GLib Input, Output and Streaming Library
*
* Copyright (C) 2006-2007 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General
* Public License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307, USA.
*
* Authors: Alexander Larsson <alexl@redhat.com>
* John McCutchan <john@johnmccutchan.com>
* Sebastian Dröge <slomo@circular-chaos.org>
*/
#include "config.h"
#include <fam.h>
#include <gio/gfilemonitor.h>
#include "fam-helper.h"
static FAMConnection* fam_connection = NULL;
static gint fam_watch_id = 0;
G_LOCK_DEFINE_STATIC(fam_connection);
struct _fam_sub
{
gchar *pathname;
gboolean directory;
gpointer user_data;
gboolean cancelled;
FAMRequest request;
};
/* This uses int as the argument type because the
real type differs between implementations:
gamin has "typedef enum FAMCodes {....} FAMCodes;"
fam has "enum FAMCodes { ... }".
*/
static GFileMonitorEvent
fam_event_to_file_monitor_event (int code)
{
switch (code)
{
case FAMChanged:
return G_FILE_MONITOR_EVENT_CHANGED;
break;
case FAMDeleted:
return G_FILE_MONITOR_EVENT_DELETED;
break;
case FAMCreated:
return G_FILE_MONITOR_EVENT_CREATED;
break;
default:
return -1;
break;
}
}
static gboolean
fam_do_iter_unlocked (void)
{
while (fam_connection != NULL && FAMPending (fam_connection)) {
FAMEvent ev;
fam_sub* sub = NULL;
gboolean cancelled;
if (FAMNextEvent (fam_connection, &ev) != 1) {
FAMClose (fam_connection);
g_free (fam_connection);
g_source_remove (fam_watch_id);
fam_watch_id = 0;
fam_connection = NULL;
return FALSE;
}
sub = (fam_sub*)ev.userdata;
cancelled = sub->cancelled;
if (ev.code == FAMAcknowledge && cancelled)
{
_fam_sub_free (sub);
continue;
}
if (cancelled)
continue;
if (sub->directory)
{
GFileMonitor* monitor = G_FILE_MONITOR (sub->user_data);
GFileMonitorEvent eflags = fam_event_to_file_monitor_event (ev.code);
gchar* path = NULL;
GFile *child, *parent;
/* unsupported event */
if (eflags == -1)
continue;
if (ev.filename[0] == '/')
path = g_strdup (ev.filename);
else
path = g_strdup_printf ("%s/%s", sub->pathname, ev.filename);
child = g_file_new_for_path (path);
parent = g_file_get_parent (child);
g_file_monitor_emit_event (monitor, child, NULL, eflags);
g_free (path);
g_object_unref (child);
g_object_unref (parent);
} else {
GFile *child;
GFileMonitor* monitor = G_FILE_MONITOR (sub->user_data);
GFileMonitorEvent eflags = fam_event_to_file_monitor_event (ev.code);
gchar* path = NULL;
if (eflags == -1)
continue;
path = g_strdup (ev.filename);
child = g_file_new_for_path (path);
g_file_monitor_emit_event (monitor, child, NULL, eflags);
g_free (path);
g_object_unref (child);
}
}
return TRUE;
}
static gboolean
fam_callback (GIOChannel *source,
GIOCondition condition,
gpointer data)
{
gboolean res;
G_LOCK (fam_connection);
res = fam_do_iter_unlocked ();
G_UNLOCK (fam_connection);
return res;
}
gboolean
_fam_sub_startup (void)
{
GIOChannel *ioc;
G_LOCK (fam_connection);
if (fam_connection == NULL) {
fam_connection = g_new0 (FAMConnection, 1);
if (FAMOpen2 (fam_connection, "gvfs user") != 0) {
g_warning ("FAMOpen failed, FAMErrno=%d\n", FAMErrno);
g_free (fam_connection);
fam_connection = NULL;
G_UNLOCK (fam_connection);
return FALSE;
}
#ifdef HAVE_FAM_NO_EXISTS
/* This is a gamin extension that avoids sending all the Exists event for dir monitors */
FAMNoExists (fam_connection);
#endif
ioc = g_io_channel_unix_new (FAMCONNECTION_GETFD(fam_connection));
fam_watch_id = g_io_add_watch (ioc,
G_IO_IN | G_IO_HUP | G_IO_ERR,
fam_callback, fam_connection);
g_io_channel_unref (ioc);
}
G_UNLOCK (fam_connection);
return TRUE;
}
void
_fam_sub_shutdown (void)
{
G_LOCK (fam_connection);
if (fam_connection != NULL) {
FAMClose (fam_connection);
g_free (fam_connection);
g_source_remove (fam_watch_id);
fam_watch_id = 0;
fam_connection = NULL;
}
G_UNLOCK (fam_connection);
}
fam_sub*
_fam_sub_add (const gchar* pathname,
gboolean directory,
gpointer user_data)
{
fam_sub *sub;
if (!_fam_sub_startup ())
return NULL;
sub = g_new0 (fam_sub, 1);
sub->pathname = g_strdup (pathname);
sub->directory = directory;
sub->user_data = user_data;
G_LOCK (fam_connection);
/* We need to queue up incoming messages to avoid blocking on write
* if there are many monitors being canceled */
fam_do_iter_unlocked ();
if (fam_connection == NULL) {
G_UNLOCK (fam_connection);
return NULL;
}
if (directory)
FAMMonitorDirectory (fam_connection, pathname, &sub->request, sub);
else
FAMMonitorFile (fam_connection, pathname, &sub->request, sub);
G_UNLOCK (fam_connection);
return sub;
}
gboolean
_fam_sub_cancel (fam_sub* sub)
{
if (sub->cancelled)
return TRUE;
sub->cancelled = TRUE;
G_LOCK (fam_connection);
/* We need to queue up incoming messages to avoid blocking on write
* if there are many monitors being canceled */
fam_do_iter_unlocked ();
if (fam_connection == NULL) {
G_UNLOCK (fam_connection);
return FALSE;
}
FAMCancelMonitor (fam_connection, &sub->request);
G_UNLOCK (fam_connection);
return TRUE;
}
void
_fam_sub_free (fam_sub* sub)
{
g_free (sub->pathname);
g_free (sub);
}