logind: first version that compiles fine

1 files changed, 263 insertions, 0 deletions

diff --git a/src/dbus-loop.c b/src/dbus-loop.c
new file mode 100644
index 000000000..8eb1d171a
--- /dev/null
+++ b/src/dbus-loop.c
@@ -0,0 +1,263 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  This file is part of systemd.
+
+  Copyright 2011 Lennart Poettering
+
+  systemd 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.
+
+  systemd 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 systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <stdbool.h>
+#include <assert.h>
+#include <sys/epoll.h>
+#include <string.h>
+#include <errno.h>
+#include <sys/timerfd.h>
+#include <unistd.h>
+
+#include "dbus-loop.h"
+#include "dbus-common.h"
+#include "util.h"
+
+/* Minimal implementation of the dbus loop which integrates all dbus
+ * events into a single epoll fd which we can triviall integrate with
+ * other loops. Note that this is not used in the main systemd daemon
+ * since we run a more elaborate mainloop there. */
+
+typedef struct EpollData {
+        int fd;
+        void *object;
+        bool is_timeout:1;
+        bool fd_is_dupped:1;
+} EpollData;
+
+static dbus_bool_t add_watch(DBusWatch *watch, void *data) {
+        EpollData *e;
+        struct epoll_event ev;
+
+        assert(watch);
+
+        e = new0(EpollData, 1);
+        if (!e)
+                return FALSE;
+
+        e->fd = dbus_watch_get_unix_fd(watch);
+        e->object = watch;
+        e->is_timeout = false;
+
+        zero(ev);
+        ev.events = bus_flags_to_events(watch);
+        ev.data.ptr = e;
+
+        if (epoll_ctl(PTR_TO_INT(data), EPOLL_CTL_ADD, e->fd, &ev) < 0) {
+
+                if (errno != EEXIST) {
+                        free(e);
+                        return FALSE;
+                }
+
+                /* Hmm, bloody D-Bus creates multiple watches on the
+                 * same fd. epoll() does not like that. As a dirty
+                 * hack we simply dup() the fd and hence get a second
+                 * one we can safely add to the epoll(). */
+
+                e->fd = dup(e->fd);
+                if (e->fd < 0) {
+                        free(e);
+                        return FALSE;
+                }
+
+                if (epoll_ctl(PTR_TO_INT(data), EPOLL_CTL_ADD, e->fd, &ev) < 0) {
+                        close_nointr_nofail(e->fd);
+                        free(e);
+                        return FALSE;
+                }
+
+                e->fd_is_dupped = true;
+        }
+
+        dbus_watch_set_data(watch, e, NULL);
+
+        return TRUE;
+}
+
+static void remove_watch(DBusWatch *watch, void *data) {
+        EpollData *e;
+
+        assert(watch);
+
+        e = dbus_watch_get_data(watch);
+        if (!e)
+                return;
+
+        assert_se(epoll_ctl(PTR_TO_INT(data), EPOLL_CTL_DEL, e->fd, NULL) >= 0);
+
+        if (e->fd_is_dupped)
+                close_nointr_nofail(e->fd);
+
+        free(e);
+}
+
+static void toggle_watch(DBusWatch *watch, void *data) {
+        EpollData *e;
+        struct epoll_event ev;
+
+        assert(watch);
+
+        e = dbus_watch_get_data(watch);
+        if (!e)
+                return;
+
+        zero(ev);
+        ev.events = bus_flags_to_events(watch);
+        ev.data.ptr = e;
+
+        assert_se(epoll_ctl(PTR_TO_INT(data), EPOLL_CTL_MOD, e->fd, &ev) == 0);
+}
+
+static int timeout_arm(EpollData *e) {
+        struct itimerspec its;
+
+        assert(e);
+        assert(e->is_timeout);
+
+        zero(its);
+
+        if (dbus_timeout_get_enabled(e->object)) {
+                timespec_store(&its.it_value, dbus_timeout_get_interval(e->object) * USEC_PER_MSEC);
+                its.it_interval = its.it_value;
+        }
+
+        if (timerfd_settime(e->fd, 0, &its, NULL) < 0)
+                return -errno;
+
+        return 0;
+}
+
+static dbus_bool_t add_timeout(DBusTimeout *timeout, void *data) {
+        EpollData *e;
+        struct epoll_event ev;
+
+        assert(timeout);
+
+        e = new0(EpollData, 1);
+        if (!e)
+                return FALSE;
+
+        e->fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC);
+        if (e->fd < 0)
+                goto fail;
+
+        e->object = timeout;
+        e->is_timeout = true;
+
+        if (timeout_arm(e) < 0)
+                goto fail;
+
+        zero(ev);
+        ev.events = EPOLLIN;
+        ev.data.ptr = e;
+
+        if (epoll_ctl(PTR_TO_INT(data), EPOLL_CTL_ADD, e->fd, &ev) < 0)
+                goto fail;
+
+        dbus_timeout_set_data(timeout, e, NULL);
+
+        return TRUE;
+
+fail:
+        if (e->fd >= 0)
+                close_nointr_nofail(e->fd);
+
+        free(e);
+        return FALSE;
+}
+
+static void remove_timeout(DBusTimeout *timeout, void *data) {
+        EpollData *e;
+
+        assert(timeout);
+
+        e = dbus_timeout_get_data(timeout);
+        if (!e)
+                return;
+
+        assert_se(epoll_ctl(PTR_TO_INT(data), EPOLL_CTL_DEL, e->fd, NULL) >= 0);
+        close_nointr_nofail(e->fd);
+        free(e);
+}
+
+static void toggle_timeout(DBusTimeout *timeout, void *data) {
+        EpollData *e;
+        int r;
+
+        assert(timeout);
+
+        e = dbus_timeout_get_data(timeout);
+        if (!e)
+                return;
+
+        r = timeout_arm(e);
+        if (r < 0)
+                log_error("Failed to rearm timer: %s", strerror(-r));
+}
+
+int bus_loop_open(DBusConnection *c) {
+        int fd;
+
+        assert(c);
+
+        fd = epoll_create1(EPOLL_CLOEXEC);
+        if (fd < 0)
+                return -errno;
+
+        if (!dbus_connection_set_watch_functions(c, add_watch, remove_watch, toggle_watch, INT_TO_PTR(fd), NULL) ||
+            !dbus_connection_set_timeout_functions(c, add_timeout, remove_timeout, toggle_timeout, INT_TO_PTR(fd), NULL)) {
+                close_nointr_nofail(fd);
+                return -ENOMEM;
+        }
+
+        return fd;
+}
+
+int bus_loop_dispatch(int fd) {
+        int n;
+        struct epoll_event event;
+        EpollData *d;
+
+        assert(fd >= 0);
+
+        zero(event);
+
+        n = epoll_wait(fd, &event, 1, 0);
+        if (n < 0)
+                return errno == EAGAIN || errno == EINTR ? 0 : -errno;
+
+        assert_se(d = event.data.ptr);
+
+        if (d->is_timeout) {
+                DBusTimeout *t = d->object;
+
+                if (dbus_timeout_get_enabled(t))
+                        dbus_timeout_handle(t);
+        } else {
+                DBusWatch *w = d->object;
+
+                if (dbus_watch_get_enabled(w))
+                        dbus_watch_handle(w, bus_events_to_flags(event.events));
+        }
+
+        return 0;
+}