*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
+/* Be careful, this file is not Linux-only: QNX also uses it */
+
#include <config.h>
-#define _GNU_SOURCE
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
+/* QNX's inotify is broken, and requires stdint.h to be manually included first */
+#include <stdint.h>
#include <sys/inotify.h>
#include <sys/types.h>
#include <signal.h>
#include <errno.h>
#include <dbus/dbus-internals.h>
+#include <dbus/dbus-list.h>
#include <dbus/dbus-watch.h>
#include "dir-watch.h"
#define MAX_DIRS_TO_WATCH 128
+#define INOTIFY_EVENT_SIZE (sizeof(struct inotify_event))
+#define INOTIFY_BUF_LEN (1024 * (INOTIFY_EVENT_SIZE + 16))
/* use a static array to avoid handling OOM */
static int wds[MAX_DIRS_TO_WATCH];
+static char *dirs[MAX_DIRS_TO_WATCH];
static int num_wds = 0;
static int inotify_fd = -1;
static DBusWatch *watch = NULL;
static DBusLoop *loop = NULL;
static dbus_bool_t
-_inotify_watch_callback (DBusWatch *watch, unsigned int condition, void *data)
+_handle_inotify_watch (DBusWatch *passed_watch, unsigned int flags, void *data)
{
- return dbus_watch_handle (watch, condition);
+ char buffer[INOTIFY_BUF_LEN];
+ ssize_t ret = 0;
+ int i = 0;
+
+ ret = read (inotify_fd, buffer, INOTIFY_BUF_LEN);
+ if (ret < 0)
+ _dbus_verbose ("Error reading inotify event: '%s'\n", _dbus_strerror(errno));
+ else if (!ret)
+ _dbus_verbose ("Error reading inotify event: buffer too small\n");
+ else
+ {
+ _dbus_verbose ("Sending SIGHUP signal on reception of %ld inotify event(s)\n", (long) ret);
+ (void) kill (_dbus_getpid (), SIGHUP);
+ }
+
+#ifdef DBUS_ENABLE_VERBOSE_MODE
+ while (i < ret)
+ {
+ struct inotify_event *ev;
+
+ ev = (struct inotify_event *) &buffer[i];
+ i += INOTIFY_EVENT_SIZE + ev->len;
+ if (ev->len)
+ _dbus_verbose ("event name: '%s'\n", ev->name);
+ _dbus_verbose ("inotify event: wd=%d mask=%u cookie=%u len=%u\n", ev->wd, ev->mask, ev->cookie, ev->len);
+ }
+#endif
+
+ return TRUE;
}
-static dbus_bool_t
-_handle_inotify_watch (DBusWatch *watch, unsigned int flags, void *data)
+#include <stdio.h>
+
+static void
+_set_watched_dirs_internal (DBusList **directories)
{
- struct inotify_event ev;
- size_t res;
- pid_t pid;
+ int new_wds[MAX_DIRS_TO_WATCH];
+ char *new_dirs[MAX_DIRS_TO_WATCH];
+ DBusList *link;
+ int i, j, wd;
- res = read (inotify_fd, &ev, sizeof(ev));
+ for (i = 0; i < MAX_DIRS_TO_WATCH; i++)
+ {
+ new_wds[i] = -1;
+ new_dirs[i] = NULL;
+ }
- if (res > 0)
+ i = 0;
+ link = _dbus_list_get_first_link (directories);
+ while (link != NULL)
{
- pid = getpid ();
- _dbus_verbose ("Sending SIGHUP signal on reception of a inotify event\n");
- (void) kill (pid, SIGHUP);
+ new_dirs[i++] = (char *)link->data;
+ link = _dbus_list_get_next_link (directories, link);
}
- else if (res < 0 && errno == EBADF)
+
+ /* Look for directories in both the old and new sets, if
+ * we find one, move its data into the new set.
+ */
+ for (i = 0; new_dirs[i]; i++)
{
- if (watch != NULL)
- {
- _dbus_loop_remove_watch (loop, watch, _inotify_watch_callback, NULL);
- _dbus_watch_unref (watch);
- watch = NULL;
- }
- pid = getpid ();
- _dbus_verbose ("Sending SIGHUP signal since inotify fd has been closed\n");
- (void) kill (pid, SIGHUP);
+ for (j = 0; j < num_wds; j++)
+ {
+ if (dirs[j] && strcmp (new_dirs[i], dirs[j]) == 0)
+ {
+ new_wds[i] = wds[j];
+ new_dirs[i] = dirs[j];
+ wds[j] = -1;
+ dirs[j] = NULL;
+ break;
+ }
+ }
}
- return TRUE;
-}
-void
-bus_watch_directory (const char *dir, BusContext *context)
-{
- int wd;
-
- _dbus_assert (dir != NULL);
-
- if (inotify_fd == -1) {
- inotify_fd = inotify_init ();
- if (inotify_fd <= 0) {
- _dbus_warn ("Cannot initialize inotify\n");
- goto out;
- }
- loop = bus_context_get_loop (context);
-
- watch = _dbus_watch_new (inotify_fd, DBUS_WATCH_READABLE, TRUE,
- _handle_inotify_watch, NULL, NULL);
-
- if (watch == NULL)
- {
- _dbus_warn ("Unable to create inotify watch\n");
- goto out;
- }
-
- if (!_dbus_loop_add_watch (loop, watch, _inotify_watch_callback,
- NULL, NULL))
- {
- _dbus_warn ("Unable to add reload watch to main loop");
- _dbus_watch_unref (watch);
- watch = NULL;
- goto out;
- }
- }
-
-
- if (num_wds >= MAX_DIRS_TO_WATCH )
+ /* Any directories we find in "wds" with a nonzero fd must
+ * not be in the new set, so perform cleanup now.
+ */
+ for (j = 0; j < num_wds; j++)
+ {
+ if (wds[j] != -1)
+ {
+ inotify_rm_watch (inotify_fd, wds[j]);
+ dbus_free (dirs[j]);
+ wds[j] = -1;
+ dirs[j] = NULL;
+ }
+ }
+
+ for (i = 0; new_dirs[i]; i++)
{
- _dbus_warn ("Cannot watch config directory '%s'. Already watching %d directories\n", dir, MAX_DIRS_TO_WATCH);
- goto out;
+ if (new_wds[i] == -1)
+ {
+ /* FIXME - less lame error handling for failing to add a watch; we may need to sleep. */
+ wd = inotify_add_watch (inotify_fd, new_dirs[i], IN_CLOSE_WRITE | IN_DELETE | IN_MOVED_TO | IN_MOVED_FROM);
+ if (wd < 0)
+ {
+ /* Not all service directories need to exist. */
+ if (errno != ENOENT)
+ {
+ _dbus_warn ("Cannot setup inotify for '%s'; error '%s'\n", new_dirs[i], _dbus_strerror (errno));
+ goto out;
+ }
+ else
+ {
+ new_wds[i] = -1;
+ new_dirs[i] = NULL;
+ continue;
+ }
+ }
+ new_wds[i] = wd;
+ new_dirs[i] = _dbus_strdup (new_dirs[i]);
+ if (!new_dirs[i])
+ {
+ /* FIXME have less lame handling for OOM, we just silently fail to
+ * watch. (In reality though, the whole OOM handling in dbus is stupid
+ * but we won't go into that in this comment =) )
+ */
+ inotify_rm_watch (inotify_fd, wd);
+ new_wds[i] = -1;
+ }
+ }
}
- wd = inotify_add_watch (inotify_fd, dir, IN_MODIFY);
- if (wd < 0)
+ num_wds = i;
+
+ for (i = 0; i < MAX_DIRS_TO_WATCH; i++)
{
- _dbus_warn ("Cannot setup inotify for '%s'; error '%s'\n", dir, _dbus_strerror (errno));
- goto out;
+ wds[i] = new_wds[i];
+ dirs[i] = new_dirs[i];
}
- wds[num_wds++] = wd;
- _dbus_verbose ("Added watch on config directory '%s'\n", dir);
+ out:;
+}
+
+#include <stdio.h>
+static void
+_shutdown_inotify (void *data)
+{
+ DBusList *empty = NULL;
+
+ if (inotify_fd == -1)
+ return;
+
+ _set_watched_dirs_internal (&empty);
- out:
- ;
+ if (watch != NULL)
+ {
+ _dbus_loop_remove_watch (loop, watch);
+ _dbus_watch_invalidate (watch);
+ _dbus_watch_unref (watch);
+ _dbus_loop_unref (loop);
+ }
+ watch = NULL;
+ loop = NULL;
+
+ close (inotify_fd);
+ inotify_fd = -1;
}
-void
-bus_drop_all_directory_watches (void)
+static int
+_init_inotify (BusContext *context)
{
- int i;
-
- _dbus_verbose ("Dropping all watches on config directories\n");
-
- for (i = 0; i < num_wds; i++)
+ int ret = 0;
+
+ if (inotify_fd == -1)
{
- if (inotify_rm_watch(inotify_fd, wds[i]) != 0)
- {
- _dbus_verbose ("Error closing fd %d for config directory watch\n", wds[i]);
- }
+#ifdef HAVE_INOTIFY_INIT1
+ inotify_fd = inotify_init1 (IN_CLOEXEC);
+ /* This ensures we still run on older Linux kernels.
+ * https://bugs.freedesktop.org/show_bug.cgi?id=23957
+ */
+ if (inotify_fd < 0)
+ inotify_fd = inotify_init ();
+#else
+ inotify_fd = inotify_init ();
+#endif
+ if (inotify_fd <= 0)
+ {
+ _dbus_warn ("Cannot initialize inotify\n");
+ goto out;
+ }
+ loop = bus_context_get_loop (context);
+ _dbus_loop_ref (loop);
+
+ watch = _dbus_watch_new (inotify_fd, DBUS_WATCH_READABLE, TRUE,
+ _handle_inotify_watch, NULL, NULL);
+
+ if (watch == NULL)
+ {
+ _dbus_warn ("Unable to create inotify watch\n");
+ goto out;
+ }
+
+ if (!_dbus_loop_add_watch (loop, watch))
+ {
+ _dbus_warn ("Unable to add reload watch to main loop");
+ _dbus_watch_unref (watch);
+ watch = NULL;
+ goto out;
+ }
+
+ if (!_dbus_register_shutdown_func (_shutdown_inotify, NULL))
+ {
+ _dbus_warn ("Unable to register shutdown func");
+ _dbus_watch_unref (watch);
+ watch = NULL;
+ goto out;
+ }
}
-
- num_wds = 0;
+
+ ret = 1;
+
+out:
+ return ret;
+}
+
+void
+bus_set_watched_dirs (BusContext *context, DBusList **directories)
+{
+ if (!_init_inotify (context))
+ return;
+
+ _set_watched_dirs_internal (directories);
}
projects / platform / upstream / dbus.git / blobdiff