glib/gio/inotify/inotify-helper.c

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/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 2; tab-width: 8 -*- */
/* inotify-helper.c - GVFS Monitor based on inotify.
Copyright (C) 2007 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>
/* Just include the local header to stop all the pain */
#include "local_inotify.h"
#if 0
#ifdef HAVE_SYS_INOTIFY_H
/* We don't actually include the libc header, because there has been
* problems with libc versions that was built without inotify support.
* Instead we use the local version.
*/
#include "local_inotify.h"
#elif defined (HAVE_LINUX_INOTIFY_H)
#include <linux/inotify.h>
#endif
#endif
#include <gio/glocalfile.h>
#include <gio/gfilemonitor.h>
#include <gio/gdirectorymonitor.h>
#include "inotify-helper.h"
#include "inotify-missing.h"
#include "inotify-path.h"
#include "inotify-diag.h"
#include "gioalias.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, inotify_sub *sub);
static void ih_not_missing_callback (inotify_sub *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 GFileMonitorEvent ih_mask_to_EventFlags (guint32 mask);
/**
* _ih_startup:
*
* Initializes the inotify backend. This must be called before
* any other functions in this module.
*
* Return value: #TRUE if initialization succeeded, #FALSE otherwise
*/
gboolean
_ih_startup (void)
{
static gboolean initialized = FALSE;
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;
}
_im_startup (ih_not_missing_callback);
_id_startup ();
IH_W ("started gvfs inotify backend\n");
initialized = TRUE;
G_UNLOCK (inotify_lock);
return TRUE;
}
/**
* Adds a subscription to be monitored.
*/
gboolean
_ih_sub_add (inotify_sub * sub)
{
G_LOCK (inotify_lock);
if (!_ip_start_watching (sub))
_im_add (sub);
G_UNLOCK (inotify_lock);
return TRUE;
}
/**
* Cancels a subscription which was being monitored.
*/
gboolean
_ih_sub_cancel (inotify_sub * sub)
{
G_LOCK (inotify_lock);
if (!sub->cancelled)
{
IH_W ("cancelling %s\n", sub->dirname);
sub->cancelled = TRUE;
_im_rm (sub);
_ip_stop_watching (sub);
}
G_UNLOCK (inotify_lock);
return TRUE;
}
static void
ih_event_callback (ik_event_t *event, inotify_sub *sub)
{
gchar *fullpath;
GFileMonitorEvent eflags;
GFile* parent;
GFile* child;
eflags = ih_mask_to_EventFlags (event->mask);
parent = g_file_new_for_path (sub->dirname);
if (event->name)
fullpath = g_strdup_printf ("%s/%s", sub->dirname, event->name);
else
fullpath = g_strdup_printf ("%s/", sub->dirname);
child = g_file_new_for_path (fullpath);
g_free (fullpath);
if (G_IS_DIRECTORY_MONITOR (sub->user_data))
{
GDirectoryMonitor* monitor = G_DIRECTORY_MONITOR (sub->user_data);
g_directory_monitor_emit_event (monitor,
child, NULL, eflags);
}
else if (G_IS_FILE_MONITOR (sub->user_data))
{
GFileMonitor* monitor = G_FILE_MONITOR (sub->user_data);
g_file_monitor_emit_event (monitor,
child, NULL, eflags);
}
g_object_unref (child);
g_object_unref (parent);
}
static void
ih_not_missing_callback (inotify_sub *sub)
{
gchar *fullpath;
GFileMonitorEvent eflags;
guint32 mask;
GFile* parent;
GFile* child;
parent = g_file_new_for_path (sub->dirname);
if (sub->filename)
{
fullpath = g_strdup_printf ("%s/%s", sub->dirname, sub->filename);
g_warning ("Missing callback called fullpath = %s\n", fullpath);
if (!g_file_test (fullpath, G_FILE_TEST_EXISTS))
{
g_free (fullpath);
return;
}
mask = IN_CREATE;
}
else
{
fullpath = g_strdup_printf ("%s", sub->dirname);
mask = IN_CREATE|IN_ISDIR;
}
eflags = ih_mask_to_EventFlags (mask);
child = g_file_new_for_path (fullpath);
g_free (fullpath);
if (G_IS_DIRECTORY_MONITOR (sub->user_data))
{
GDirectoryMonitor* monitor = G_DIRECTORY_MONITOR (sub->user_data);
g_directory_monitor_emit_event (monitor, child, NULL, eflags);
}
else if (G_IS_FILE_MONITOR (sub->user_data))
{
GFileMonitor* monitor = G_FILE_MONITOR (sub->user_data);
g_file_monitor_emit_event (monitor,
child, NULL, eflags);
}
g_object_unref (child);
g_object_unref (parent);
}
/* Transforms a inotify event to a GVFS event. */
static GFileMonitorEvent
ih_mask_to_EventFlags (guint32 mask)
{
mask &= ~IN_ISDIR;
switch (mask)
{
case IN_MODIFY:
return G_FILE_MONITOR_EVENT_CHANGED;
case IN_CLOSE_WRITE:
return G_FILE_MONITOR_EVENT_CHANGES_DONE_HINT;
case IN_ATTRIB:
return G_FILE_MONITOR_EVENT_ATTRIBUTE_CHANGED;
case IN_MOVE_SELF:
case IN_MOVED_FROM:
case IN_DELETE:
case IN_DELETE_SELF:
return G_FILE_MONITOR_EVENT_DELETED;
case IN_CREATE:
case IN_MOVED_TO:
return G_FILE_MONITOR_EVENT_CREATED;
case IN_UNMOUNT:
return G_FILE_MONITOR_EVENT_UNMOUNTED;
case IN_Q_OVERFLOW:
case IN_OPEN:
case IN_CLOSE_NOWRITE:
case IN_ACCESS:
case IN_IGNORED:
default:
return -1;
}
}