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authorJohn (J5) Palmieri <johnp@redhat.com>2008-01-14 19:00:36 -0500
committerJohn (J5) Palmieri <johnp@redhat.com>2008-01-14 19:00:36 -0500
commit831a0d71c4767f81dd69f4078b393ff73d22172a (patch)
tree5d98096a8108455c34e368901e75698eb0ef797c /bus/dir-watch-inotify.c
parentcbf5d0b6fab515948155d0816ed84657f5e8ebb3 (diff)
add inotify support (FDO Bz#13268)
2008-01-14 John (J5) Palmieri <johnp@redhat.com> * patch by Frederic Crozat <fcrozat at mandriva dot com> (FDO Bz# 13268) * add inotify support * bus/Makefile.am: add inotify module to the build * bus/dir-watch-inotify.c: inotify module based off the dnotify and kqueue modules * configure.in: add checks and switch for inotify also add a printout at the end of configure if inotify and kqueue support is being built in (dnotify already had this)
Diffstat (limited to 'bus/dir-watch-inotify.c')
-rw-r--r--bus/dir-watch-inotify.c156
1 files changed, 156 insertions, 0 deletions
diff --git a/bus/dir-watch-inotify.c b/bus/dir-watch-inotify.c
new file mode 100644
index 00000000..0f3c155c
--- /dev/null
+++ b/bus/dir-watch-inotify.c
@@ -0,0 +1,156 @@
+/* -*- mode: C; c-file-style: "gnu" -*- */
+/* dir-watch-inotify.c OS specific directory change notification for message bus
+ *
+ * Copyright (C) 2003 Red Hat, Inc.
+ * (c) 2006 Mandriva
+ *
+ * Licensed under the Academic Free License version 2.1
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * 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
+ *
+ */
+
+#include <config.h>
+
+#define _GNU_SOURCE
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/inotify.h>
+#include <sys/types.h>
+#include <signal.h>
+#include <errno.h>
+
+#include <dbus/dbus-internals.h>
+#include <dbus/dbus-watch.h>
+#include "dir-watch.h"
+
+#define MAX_DIRS_TO_WATCH 128
+
+/* use a static array to avoid handling OOM */
+static int wds[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)
+{
+ return dbus_watch_handle (watch, condition);
+}
+
+static dbus_bool_t
+_handle_inotify_watch (DBusWatch *watch, unsigned int flags, void *data)
+{
+ struct inotify_event ev;
+ size_t res;
+ pid_t pid;
+
+ res = read (inotify_fd, &ev, sizeof(ev));
+
+ if (res > 0)
+ {
+ pid = getpid ();
+ _dbus_verbose ("Sending SIGHUP signal on reception of a inotify event\n");
+ (void) kill (pid, SIGHUP);
+ }
+ else if (res < 0 && errno == EBADF)
+ {
+ 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);
+ }
+
+ 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 )
+ {
+ _dbus_warn ("Cannot watch config directory '%s'. Already watching %d directories\n", dir, MAX_DIRS_TO_WATCH);
+ goto out;
+ }
+
+ wd = inotify_add_watch (inotify_fd, dir, IN_MODIFY);
+ if (wd < 0)
+ {
+ _dbus_warn ("Cannot setup inotify for '%s'; error '%s'\n", dir, _dbus_strerror (errno));
+ goto out;
+ }
+
+ wds[num_wds++] = wd;
+ _dbus_verbose ("Added watch on config directory '%s'\n", dir);
+
+ out:
+ ;
+}
+
+void
+bus_drop_all_directory_watches (void)
+{
+ int i;
+
+ _dbus_verbose ("Dropping all watches on config directories\n");
+
+ for (i = 0; i < num_wds; i++)
+ {
+ if (inotify_rm_watch(inotify_fd, wds[i]) != 0)
+ {
+ _dbus_verbose ("Error closing fd %d for config directory watch\n", wds[i]);
+ }
+ }
+
+ num_wds = 0;
+}