diff options
Diffstat (limited to 'bus/dir-watch-inotify.c')
| -rw-r--r-- | bus/dir-watch-inotify.c | 156 |
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; +} |