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59e46c4928
The kqueue file monitoring backend was misusing G_GNUC_INTERNAL for want of 'static' in a couple of places and also using it to declare a lock that was never used at all. Fix those up.
647 lines
16 KiB
C
647 lines
16 KiB
C
/*******************************************************************************
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Copyright (c) 2011, 2012 Dmitry Matveev <me@dmitrymatveev.co.uk>
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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*******************************************************************************/
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#include "config.h"
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#include <sys/types.h>
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#include <sys/event.h>
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#include <sys/time.h>
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#include <sys/socket.h>
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#include <gio/glocalfile.h>
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#include <gio/gfile.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <pthread.h>
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#include "kqueue-helper.h"
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#include "kqueue-utils.h"
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#include "kqueue-thread.h"
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#include "kqueue-missing.h"
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#include "kqueue-exclusions.h"
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#include "gkqueuedirectorymonitor.h"
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static gboolean kh_debug_enabled = FALSE;
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#define KH_W if (kh_debug_enabled) g_warning
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static GHashTable *subs_hash_table = NULL;
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G_LOCK_DEFINE_STATIC (hash_lock);
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static int kqueue_descriptor = -1;
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static int kqueue_socket_pair[] = {-1, -1};
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static pthread_t kqueue_thread;
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void _kh_file_appeared_cb (kqueue_sub *sub);
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/**
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* accessor function for kqueue_descriptor
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**/
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int
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get_kqueue_descriptor()
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{
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return kqueue_descriptor;
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}
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/**
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* convert_kqueue_events_to_gio:
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* @flags: a set of kqueue filter flags
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* @done: a pointer to #gboolean indicating that the
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* conversion has been done (out)
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*
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* Translates kqueue filter flags into GIO event flags.
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*
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* Returns: a #GFileMonitorEvent
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**/
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static GFileMonitorEvent
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convert_kqueue_events_to_gio (uint32_t flags, gboolean *done)
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{
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g_assert (done != NULL);
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*done = FALSE;
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/* TODO: The following notifications should be emulated, if possible:
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* - G_FILE_MONITOR_EVENT_PRE_UNMOUNT
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*/
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if (flags & NOTE_DELETE)
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{
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*done = TRUE;
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return G_FILE_MONITOR_EVENT_DELETED;
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}
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if (flags & NOTE_ATTRIB)
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{
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*done = TRUE;
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return G_FILE_MONITOR_EVENT_ATTRIBUTE_CHANGED;
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}
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if (flags & (NOTE_WRITE | NOTE_EXTEND))
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{
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*done = TRUE;
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return G_FILE_MONITOR_EVENT_CHANGED;
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}
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if (flags & NOTE_RENAME)
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{
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*done = TRUE;
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return G_FILE_MONITOR_EVENT_MOVED;
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}
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if (flags & NOTE_REVOKE)
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{
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*done = TRUE;
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return G_FILE_MONITOR_EVENT_UNMOUNTED;
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}
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/* done is FALSE */
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return 0;
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}
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typedef struct {
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kqueue_sub *sub;
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GFileMonitor *monitor;
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} handle_ctx;
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/**
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* handle_created:
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* @udata: a pointer to user data (#handle_context).
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* @path: file name of a new file.
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* @inode: inode number of a new file.
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*
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* A callback function for the directory diff calculation routine,
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* produces G_FILE_MONITOR_EVENT_CREATED event for a created file.
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**/
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static void
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handle_created (void *udata, const char *path, ino_t inode)
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{
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handle_ctx *ctx = NULL;
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GFile *file = NULL;
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gchar *fpath = NULL;
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(void) inode;
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ctx = (handle_ctx *) udata;
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g_assert (udata != NULL);
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g_assert (ctx->sub != NULL);
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g_assert (ctx->monitor != NULL);
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fpath = _ku_path_concat (ctx->sub->filename, path);
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if (fpath == NULL)
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{
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KH_W ("Failed to allocate a string for a new event");
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return;
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}
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file = g_file_new_for_path (fpath);
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g_file_monitor_emit_event (ctx->monitor,
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file,
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NULL,
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G_FILE_MONITOR_EVENT_CREATED);
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g_free (fpath);
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g_object_unref (file);
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}
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/**
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* handle_deleted:
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* @udata: a pointer to user data (#handle_context).
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* @path: file name of the removed file.
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* @inode: inode number of the removed file.
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*
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* A callback function for the directory diff calculation routine,
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* produces G_FILE_MONITOR_EVENT_DELETED event for a deleted file.
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**/
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static void
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handle_deleted (void *udata, const char *path, ino_t inode)
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{
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handle_ctx *ctx = NULL;
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GFile *file = NULL;
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gchar *fpath = NULL;
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(void) inode;
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ctx = (handle_ctx *) udata;
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g_assert (udata != NULL);
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g_assert (ctx->sub != NULL);
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g_assert (ctx->monitor != NULL);
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fpath = _ku_path_concat (ctx->sub->filename, path);
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if (fpath == NULL)
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{
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KH_W ("Failed to allocate a string for a new event");
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return;
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}
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file = g_file_new_for_path (fpath);
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g_file_monitor_emit_event (ctx->monitor,
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file,
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NULL,
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G_FILE_MONITOR_EVENT_DELETED);
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g_free (fpath);
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g_object_unref (file);
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}
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/**
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* handle_moved:
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* @udata: a pointer to user data (#handle_context).
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* @from_path: file name of the source file.
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* @from_inode: inode number of the source file.
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* @to_path: file name of the replaced file.
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* @to_inode: inode number of the replaced file.
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*
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* A callback function for the directory diff calculation routine,
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* produces G_FILE_MONITOR_EVENT_MOVED event on a move.
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**/
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static void
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handle_moved (void *udata,
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const char *from_path,
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ino_t from_inode,
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const char *to_path,
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ino_t to_inode)
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{
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handle_ctx *ctx = NULL;
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GFile *file = NULL;
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GFile *other = NULL;
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gchar *path = NULL;
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gchar *npath = NULL;
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(void) from_inode;
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(void) to_inode;
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ctx = (handle_ctx *) udata;
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g_assert (udata != NULL);
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g_assert (ctx->sub != NULL);
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g_assert (ctx->monitor != NULL);
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path = _ku_path_concat (ctx->sub->filename, from_path);
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npath = _ku_path_concat (ctx->sub->filename, to_path);
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if (path == NULL || npath == NULL)
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{
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KH_W ("Failed to allocate strings for event");
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return;
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}
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file = g_file_new_for_path (path);
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other = g_file_new_for_path (npath);
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if (ctx->sub->pair_moves)
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{
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g_file_monitor_emit_event (ctx->monitor,
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file,
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other,
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G_FILE_MONITOR_EVENT_MOVED);
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}
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else
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{
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g_file_monitor_emit_event (ctx->monitor,
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file,
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NULL,
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G_FILE_MONITOR_EVENT_DELETED);
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g_file_monitor_emit_event (ctx->monitor,
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other,
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NULL,
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G_FILE_MONITOR_EVENT_CREATED);
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}
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g_free (path);
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g_free (npath);
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g_object_unref (file);
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g_object_unref (other);
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}
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/**
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* handle_overwritten:
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* @data: a pointer to user data (#handle_context).
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* @path: file name of the overwritten file.
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* @node: inode number of the overwritten file.
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*
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* A callback function for the directory diff calculation routine,
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* produces G_FILE_MONITOR_EVENT_DELETED/CREATED event pair when
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* an overwrite occurs in the directory (see dep-list for details).
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**/
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static void
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handle_overwritten (void *udata, const char *path, ino_t inode)
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{
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handle_ctx *ctx = NULL;
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GFile *file = NULL;
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gchar *fpath = NULL;
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(void) inode;
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ctx = (handle_ctx *) udata;
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g_assert (udata != NULL);
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g_assert (ctx->sub != NULL);
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g_assert (ctx->monitor != NULL);
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fpath = _ku_path_concat (ctx->sub->filename, path);
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if (fpath == NULL)
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{
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KH_W ("Failed to allocate a string for a new event");
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return;
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}
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file = g_file_new_for_path (fpath);
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g_file_monitor_emit_event (ctx->monitor,
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file,
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NULL,
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G_FILE_MONITOR_EVENT_DELETED);
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g_file_monitor_emit_event (ctx->monitor,
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file,
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NULL,
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G_FILE_MONITOR_EVENT_CREATED);
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g_free (fpath);
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g_object_unref (file);
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}
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static const traverse_cbs cbs = {
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handle_created,
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handle_deleted,
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handle_moved,
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handle_overwritten,
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handle_moved,
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NULL, /* many added */
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NULL, /* many removed */
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NULL, /* names updated */
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};
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void
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_kh_dir_diff (kqueue_sub *sub, GFileMonitor *monitor)
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{
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dep_list *was;
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handle_ctx ctx;
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g_assert (sub != NULL);
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g_assert (monitor != NULL);
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memset (&ctx, 0, sizeof (handle_ctx));
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ctx.sub = sub;
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ctx.monitor = monitor;
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was = sub->deps;
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sub->deps = dl_listing (sub->filename);
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dl_calculate (was, sub->deps, &cbs, &ctx);
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dl_free (was);
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}
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/**
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* process_kqueue_notifications:
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* @gioc: unused.
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* @cond: unused.
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* @data: unused.
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*
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* Processes notifications, coming from the kqueue thread.
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*
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* Reads notifications from the command file descriptor, emits the
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* "changed" event on the appropriate monitor.
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*
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* A typical GIO Channel callback function.
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*
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* Returns: %TRUE
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**/
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static gboolean
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process_kqueue_notifications (GIOChannel *gioc,
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GIOCondition cond,
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gpointer data)
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{
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struct kqueue_notification n;
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kqueue_sub *sub = NULL;
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GFileMonitor *monitor = NULL;
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GFileMonitorEvent mask = 0;
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g_assert (kqueue_socket_pair[0] != -1);
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if (!_ku_read (kqueue_socket_pair[0], &n, sizeof (struct kqueue_notification)))
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{
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KH_W ("Failed to read a kqueue notification, error %d", errno);
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return TRUE;
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}
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G_LOCK (hash_lock);
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sub = (kqueue_sub *) g_hash_table_lookup (subs_hash_table, GINT_TO_POINTER (n.fd));
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G_UNLOCK (hash_lock);
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if (sub == NULL)
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{
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KH_W ("Got a notification for a deleted or non-existing subscription %d",
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n.fd);
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return TRUE;
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}
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monitor = G_FILE_MONITOR (sub->user_data);
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g_assert (monitor != NULL);
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if (n.flags & (NOTE_DELETE | NOTE_REVOKE))
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{
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if (sub->deps)
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{
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dl_free (sub->deps);
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sub->deps = NULL;
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}
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_km_add_missing (sub);
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if (!(n.flags & NOTE_REVOKE))
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{
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/* Note that NOTE_REVOKE is issued by the kqueue thread
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* on EV_ERROR kevent. In this case, a file descriptor is
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* already closed from the kqueue thread, no need to close
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* it manually */
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_kh_cancel_sub (sub);
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}
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}
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if (sub->is_dir && n.flags & (NOTE_WRITE | NOTE_EXTEND))
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{
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_kh_dir_diff (sub, monitor);
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n.flags &= ~(NOTE_WRITE | NOTE_EXTEND);
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}
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if (n.flags)
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{
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gboolean done = FALSE;
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mask = convert_kqueue_events_to_gio (n.flags, &done);
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if (done == TRUE)
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{
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GFile *file = g_file_new_for_path (sub->filename);
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g_file_monitor_emit_event (monitor, file, NULL, mask);
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g_object_unref (file);
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}
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}
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return TRUE;
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}
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/**
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* _kh_startup_impl:
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* @unused: unused
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*
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* Kqueue backend startup code. Should be called only once.
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*
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* Returns: %TRUE on success, %FALSE otherwise.
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**/
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static gpointer
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_kh_startup_impl (gpointer unused)
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{
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GIOChannel *channel = NULL;
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gboolean result = FALSE;
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kqueue_descriptor = kqueue ();
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result = (kqueue_descriptor != -1);
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if (!result)
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{
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KH_W ("Failed to initialize kqueue\n!");
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return GINT_TO_POINTER (FALSE);
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}
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result = socketpair (AF_UNIX, SOCK_STREAM, 0, kqueue_socket_pair);
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if (result != 0)
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{
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KH_W ("Failed to create socket pair\n!");
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return GINT_TO_POINTER (FALSE) ;
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}
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result = pthread_create (&kqueue_thread,
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NULL,
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_kqueue_thread_func,
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&kqueue_socket_pair[1]);
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if (result != 0)
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{
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KH_W ("Failed to run kqueue thread\n!");
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return GINT_TO_POINTER (FALSE);
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}
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_km_init (_kh_file_appeared_cb);
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channel = g_io_channel_unix_new (kqueue_socket_pair[0]);
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g_io_add_watch (channel, G_IO_IN, process_kqueue_notifications, NULL);
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subs_hash_table = g_hash_table_new (g_direct_hash, g_direct_equal);
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KH_W ("started gio kqueue backend\n");
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return GINT_TO_POINTER (TRUE);
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}
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/**
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* _kh_startup:
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* Kqueue backend initialization.
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*
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* Returns: %TRUE on success, %FALSE otherwise.
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**/
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gboolean
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_kh_startup (void)
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{
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static GOnce init_once = G_ONCE_INIT;
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g_once (&init_once, _kh_startup_impl, NULL);
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return GPOINTER_TO_INT (init_once.retval);
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}
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/**
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* _kh_start_watching:
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* @sub: a #kqueue_sub
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*
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* Starts watching on a subscription.
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*
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* Returns: %TRUE on success, %FALSE otherwise.
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**/
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gboolean
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_kh_start_watching (kqueue_sub *sub)
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{
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g_assert (kqueue_socket_pair[0] != -1);
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g_assert (sub != NULL);
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g_assert (sub->filename != NULL);
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/* kqueue requires a file descriptor to monitor. Sad but true */
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#if defined (O_EVTONLY)
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sub->fd = open (sub->filename, O_EVTONLY);
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#else
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sub->fd = open (sub->filename, O_RDONLY);
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#endif
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if (sub->fd == -1)
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{
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KH_W ("failed to open file %s (error %d)", sub->filename, errno);
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return FALSE;
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}
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_ku_file_information (sub->fd, &sub->is_dir, NULL);
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if (sub->is_dir)
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{
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/* I know, it is very bad to make such decisions in this way and here.
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* We already do have an user_data at the #kqueue_sub, and it may point to
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* GKqueueFileMonitor or GKqueueDirectoryMonitor. For a directory case,
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* we need to scan in contents for the further diffs. Ideally this process
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* should be delegated to the GKqueueDirectoryMonitor, but for now I will
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* do it in a dirty way right here. */
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if (sub->deps)
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dl_free (sub->deps);
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sub->deps = dl_listing (sub->filename);
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}
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G_LOCK (hash_lock);
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g_hash_table_insert (subs_hash_table, GINT_TO_POINTER (sub->fd), sub);
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G_UNLOCK (hash_lock);
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_kqueue_thread_push_fd (sub->fd);
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/* Bump the kqueue thread. It will pick up a new sub entry to monitor */
|
|
if (!_ku_write (kqueue_socket_pair[0], "A", 1))
|
|
KH_W ("Failed to bump the kqueue thread (add fd, error %d)", errno);
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
/**
|
|
* _kh_add_sub:
|
|
* @sub: a #kqueue_sub
|
|
*
|
|
* Adds a subscription for monitoring.
|
|
*
|
|
* This funciton tries to start watching a subscription with
|
|
* _kh_start_watching(). On failure, i.e. when a file does not exist yet,
|
|
* the subscription will be added to a list of missing files to continue
|
|
* watching when the file will appear.
|
|
*
|
|
* Returns: %TRUE
|
|
**/
|
|
gboolean
|
|
_kh_add_sub (kqueue_sub *sub)
|
|
{
|
|
g_assert (sub != NULL);
|
|
|
|
if (!_kh_start_watching (sub))
|
|
_km_add_missing (sub);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
/**
|
|
* _kh_cancel_sub:
|
|
* @sub a #kqueue_sub
|
|
*
|
|
* Stops monitoring on a subscription.
|
|
*
|
|
* Returns: %TRUE
|
|
**/
|
|
gboolean
|
|
_kh_cancel_sub (kqueue_sub *sub)
|
|
{
|
|
gboolean missing = FALSE;
|
|
g_assert (kqueue_socket_pair[0] != -1);
|
|
g_assert (sub != NULL);
|
|
|
|
G_LOCK (hash_lock);
|
|
missing = !g_hash_table_remove (subs_hash_table, GINT_TO_POINTER (sub->fd));
|
|
G_UNLOCK (hash_lock);
|
|
|
|
if (missing)
|
|
{
|
|
/* If there were no fd for this subscription, file is still
|
|
* missing. */
|
|
KH_W ("Removing subscription from missing");
|
|
_km_remove (sub);
|
|
}
|
|
else
|
|
{
|
|
/* fd will be closed in the kqueue thread */
|
|
_kqueue_thread_remove_fd (sub->fd);
|
|
|
|
/* Bump the kqueue thread. It will pick up a new sub entry to remove*/
|
|
if (!_ku_write (kqueue_socket_pair[0], "R", 1))
|
|
KH_W ("Failed to bump the kqueue thread (remove fd, error %d)", errno);
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
/**
|
|
* _kh_file_appeared_cb:
|
|
* @sub: a #kqueue_sub
|
|
*
|
|
* A callback function for kqueue-missing subsystem.
|
|
*
|
|
* Signals that a missing file has finally appeared in the filesystem.
|
|
* Emits %G_FILE_MONITOR_EVENT_CREATED.
|
|
**/
|
|
void
|
|
_kh_file_appeared_cb (kqueue_sub *sub)
|
|
{
|
|
GFile* child;
|
|
|
|
g_assert (sub != NULL);
|
|
g_assert (sub->filename);
|
|
|
|
if (!g_file_test (sub->filename, G_FILE_TEST_EXISTS))
|
|
return;
|
|
|
|
child = g_file_new_for_path (sub->filename);
|
|
|
|
g_file_monitor_emit_event (G_FILE_MONITOR (sub->user_data),
|
|
child,
|
|
NULL,
|
|
G_FILE_MONITOR_EVENT_CREATED);
|
|
|
|
g_object_unref (child);
|
|
}
|