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Diffstat (limited to 'gio/inotify/inotify-helper.c')
| -rw-r--r-- | gio/inotify/inotify-helper.c | 264 |
1 files changed, 264 insertions, 0 deletions
diff --git a/gio/inotify/inotify-helper.c b/gio/inotify/inotify-helper.c new file mode 100644 index 000000000..82a68de2e --- /dev/null +++ b/gio/inotify/inotify-helper.c @@ -0,0 +1,264 @@ +/* -*- 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" + +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; + } +} |