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f1cd229f83
They used to be needed, but are not needed any more, and we were never completely consistent about including them in any case. Signed-off-by: Simon McVittie <smcv@debian.org>
329 lines
7.5 KiB
C
329 lines
7.5 KiB
C
/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
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/* dir-watch-kqueue.c OS specific directory change notification for message bus
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*
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* Copyright (C) 2003 Red Hat, Inc.
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*
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* Licensed under the Academic Free License version 2.1
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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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 <signal.h>
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#include <fcntl.h>
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#include <unistd.h>
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#ifdef HAVE_ERRNO_H
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#include <errno.h>
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#endif
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#include "bus.h"
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#include <dbus/dbus-watch.h>
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#include <dbus/dbus-internals.h>
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#include <dbus/dbus-list.h>
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#include <dbus/dbus-sysdeps-unix.h>
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#include "dir-watch.h"
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#define MAX_DIRS_TO_WATCH 128
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static int kq = -1;
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static int fds[MAX_DIRS_TO_WATCH];
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static char *dirs[MAX_DIRS_TO_WATCH];
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static int num_fds = 0;
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static DBusWatch *watch = NULL;
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static DBusLoop *loop = NULL;
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static dbus_bool_t
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_handle_kqueue_watch (DBusWatch *watch, unsigned int flags, void *data)
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{
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struct kevent ev;
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struct timespec nullts = { 0, 0 };
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int res;
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pid_t pid;
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res = kevent (kq, NULL, 0, &ev, 1, &nullts);
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/* Sleep for half a second to avoid a race when files are install(1)'d
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* to system.d. */
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usleep(500000);
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if (res > 0)
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{
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pid = getpid ();
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_dbus_verbose ("Sending SIGHUP signal on reception of a kevent\n");
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(void) kill (pid, SIGHUP);
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}
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else if (res < 0 && errno == EBADF)
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{
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kq = -1;
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if (watch != NULL)
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{
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_dbus_loop_remove_watch (loop, watch);
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_dbus_watch_invalidate (watch);
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_dbus_watch_unref (watch);
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watch = NULL;
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}
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pid = getpid ();
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_dbus_verbose ("Sending SIGHUP signal since kqueue has been closed\n");
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(void) kill (pid, SIGHUP);
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}
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return TRUE;
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}
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static void _shutdown_kqueue (void *data)
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{
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int i;
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if (kq < 0)
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return;
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for (i = 0; i < MAX_DIRS_TO_WATCH; i++)
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{
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if (fds[i] >= 0)
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{
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close (fds[i]);
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fds[i] = -1;
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}
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if (dirs[i] != NULL)
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{
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/* dbus_free() is necessary to pass memleak check */
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dbus_free (dirs[i]);
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dirs[i] = NULL;
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}
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}
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if (loop)
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{
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_dbus_loop_remove_watch (loop, watch);
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_dbus_loop_unref (loop);
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loop = NULL;
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}
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if (watch)
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{
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_dbus_watch_invalidate (watch);
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_dbus_watch_unref (watch);
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watch = NULL;
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}
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close (kq);
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kq = -1;
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}
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static int
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_init_kqueue (BusContext *context)
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{
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if (kq < 0)
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{
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kq = kqueue ();
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if (kq < 0)
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{
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_dbus_warn ("Cannot create kqueue; error '%s'", _dbus_strerror (errno));
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goto out;
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}
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loop = bus_context_get_loop (context);
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_dbus_loop_ref (loop);
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watch = _dbus_watch_new (kq, DBUS_WATCH_READABLE, TRUE,
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_handle_kqueue_watch, NULL, NULL);
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if (watch == NULL)
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{
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_dbus_warn ("Unable to create kqueue watch");
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goto out1;
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}
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if (!_dbus_loop_add_watch (loop, watch))
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{
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_dbus_warn ("Unable to add reload watch to main loop");
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goto out2;
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}
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if (!_dbus_register_shutdown_func (_shutdown_kqueue, NULL))
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{
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_dbus_warn ("Unable to register shutdown function");
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goto out3;
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}
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}
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return 1;
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out3:
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_dbus_loop_remove_watch (loop, watch);
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out2:
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if (watch)
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{
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_dbus_watch_invalidate (watch);
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_dbus_watch_unref (watch);
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watch = NULL;
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}
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out1:
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if (kq >= 0)
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{
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close (kq);
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kq = -1;
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}
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if (loop)
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{
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_dbus_loop_unref (loop);
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loop = NULL;
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}
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out:
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return 0;
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}
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void
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bus_set_watched_dirs (BusContext *context, DBusList **directories)
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{
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int new_fds[MAX_DIRS_TO_WATCH];
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char *new_dirs[MAX_DIRS_TO_WATCH];
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DBusList *link;
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int i, j, fd;
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struct kevent ev;
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#ifdef O_CLOEXEC
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dbus_bool_t cloexec_done = 0;
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#endif
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if (!_init_kqueue (context))
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goto out;
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for (i = 0; i < MAX_DIRS_TO_WATCH; i++)
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{
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new_fds[i] = -1;
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new_dirs[i] = NULL;
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}
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i = 0;
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link = _dbus_list_get_first_link (directories);
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while (link != NULL)
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{
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new_dirs[i++] = (char *)link->data;
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link = _dbus_list_get_next_link (directories, link);
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}
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/* Look for directories in both the old and new sets, if
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* we find one, move its data into the new set.
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*/
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for (i = 0; new_dirs[i]; i++)
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{
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for (j = 0; j < num_fds; j++)
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{
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if (dirs[j] && strcmp (new_dirs[i], dirs[j]) == 0)
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{
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new_fds[i] = fds[j];
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new_dirs[i] = dirs[j];
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fds[j] = -1;
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dirs[j] = NULL;
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break;
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}
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}
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}
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/* Any directory we find in "fds" with a nonzero fd must
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* not be in the new set, so perform cleanup now.
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*/
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for (j = 0; j < num_fds; j++)
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{
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if (fds[j] != -1)
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{
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close (fds[j]);
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dbus_free (dirs[j]);
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fds[j] = -1;
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dirs[j] = NULL;
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}
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}
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for (i = 0; new_dirs[i]; i++)
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{
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if (new_fds[i] == -1)
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{
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/* FIXME - less lame error handling for failing to add a watch;
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* we may need to sleep.
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*/
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#ifdef O_CLOEXEC
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fd = open (new_dirs[i], O_RDONLY | O_CLOEXEC);
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cloexec_done = (fd >= 0);
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if (fd < 0 && errno == EINVAL)
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#endif
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{
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fd = open (new_dirs[i], O_RDONLY);
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}
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if (fd < 0)
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{
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if (errno != ENOENT)
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{
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_dbus_warn ("Cannot open directory '%s'; error '%s'", new_dirs[i], _dbus_strerror (errno));
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goto out;
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}
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else
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{
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new_fds[i] = -1;
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new_dirs[i] = NULL;
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continue;
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}
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}
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#ifdef O_CLOEXEC
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if (!cloexec_done)
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#endif
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{
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_dbus_fd_set_close_on_exec (fd);
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}
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EV_SET (&ev, fd, EVFILT_VNODE, EV_ADD | EV_ENABLE | EV_CLEAR,
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NOTE_DELETE | NOTE_EXTEND | NOTE_WRITE | NOTE_RENAME, 0, 0);
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if (kevent (kq, &ev, 1, NULL, 0, NULL) == -1)
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{
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_dbus_warn ("Cannot setup a kevent for '%s'; error '%s'", new_dirs[i], _dbus_strerror (errno));
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close (fd);
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goto out;
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}
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new_fds[i] = fd;
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new_dirs[i] = _dbus_strdup (new_dirs[i]);
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if (!new_dirs[i])
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{
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/* FIXME have less lame handling for OOM, we just silently fail to
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* watch. (In reality though, the whole OOM handling in dbus is
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* stupid but we won't go into that in this comment =) )
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*/
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close (fd);
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new_fds[i] = -1;
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}
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}
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}
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num_fds = i;
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for (i = 0; i < MAX_DIRS_TO_WATCH; i++)
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{
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fds[i] = new_fds[i];
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dirs[i] = new_dirs[i];
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}
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out:
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;
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}
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