--- /dev/null
+/***
+ This file is part of avahi.
+
+ avahi is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as
+ published by the Free Software Foundation; either version 2.1 of the
+ License, or (at your option) any later version.
+
+ avahi 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 Lesser General
+ Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with avahi; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+ USA.
+***/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <sys/poll.h>
+#include <assert.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <stdio.h>
+
+#include <avahi/llist.h>
+#include <avahi/malloc.h>
+#include <avahi/timeval.h>
+#include <avahi/simple-watch.h>
+
+struct AvahiWatch {
+ AvahiSimplePoll *simple_poll;
+ int dead;
+
+ int idx;
+ struct pollfd pollfd;
+
+ AvahiWatchCallback callback;
+ void *userdata;
+
+ AVAHI_LLIST_FIELDS(AvahiWatch, watches);
+};
+
+struct AvahiTimeout {
+ AvahiSimplePoll *simple_poll;
+ int dead;
+
+ int enabled;
+ struct timeval expiry;
+
+ AvahiTimeoutCallback callback;
+ void *userdata;
+
+ AVAHI_LLIST_FIELDS(AvahiTimeout, timeouts);
+};
+
+struct AvahiSimplePoll {
+ AvahiPoll api;
+ AvahiPollFunc poll_func;
+ void *poll_func_userdata;
+
+ struct pollfd* pollfds;
+ int n_pollfds, max_pollfds, rebuild_pollfds;
+
+ int watch_req_cleanup, timeout_req_cleanup;
+ int quit;
+ int events_valid;
+
+ int n_watches;
+ AVAHI_LLIST_HEAD(AvahiWatch, watches);
+ AVAHI_LLIST_HEAD(AvahiTimeout, timeouts);
+
+ int wakeup_pipe[2];
+ int wakeup_issued;
+
+ int prepared_timeout;
+
+ enum {
+ STATE_INIT,
+ STATE_PREPARING,
+ STATE_PREPARED,
+ STATE_RUNNING,
+ STATE_RAN,
+ STATE_DISPATCHING,
+ STATE_DISPATCHED,
+ STATE_QUIT,
+ STATE_FAILURE
+ } state;
+};
+
+void avahi_simple_poll_wakeup(AvahiSimplePoll *s) {
+ char c = 'W';
+ assert(s);
+
+ write(s->wakeup_pipe[1], &c, sizeof(c));
+ s->wakeup_issued = 1;
+}
+
+static void clear_wakeup(AvahiSimplePoll *s) {
+ char c[10]; /* Read ten at a time */
+
+ if (!s->wakeup_issued)
+ return;
+
+ s->wakeup_issued = 0;
+
+ for(;;)
+ if (read(s->wakeup_pipe[0], &c, sizeof(c)) != sizeof(c))
+ break;
+}
+
+static int set_nonblock(int fd) {
+ int n;
+
+ assert(fd >= 0);
+
+ if ((n = fcntl(fd, F_GETFL)) < 0)
+ return -1;
+
+ if (n & O_NONBLOCK)
+ return 0;
+
+ return fcntl(fd, F_SETFL, n|O_NONBLOCK);
+}
+
+static AvahiWatch* watch_new(const AvahiPoll *api, int fd, AvahiWatchEvent event, AvahiWatchCallback callback, void *userdata) {
+ AvahiWatch *w;
+ AvahiSimplePoll *s;
+
+ assert(api);
+ assert(fd >= 0);
+ assert(callback);
+
+ s = api->userdata;
+ assert(s);
+
+ if (!(w = avahi_new(AvahiWatch, 1)))
+ return NULL;
+
+ /* If there is a background thread running the poll() for us, tell it to exit the poll() */
+ avahi_simple_poll_wakeup(s);
+
+ w->simple_poll = s;
+ w->dead = 0;
+
+ w->pollfd.fd = fd;
+ w->pollfd.events = event;
+ w->pollfd.revents = 0;
+
+ w->callback = callback;
+ w->userdata = userdata;
+
+ w->idx = -1;
+ s->rebuild_pollfds = 1;
+
+ AVAHI_LLIST_PREPEND(AvahiWatch, watches, s->watches, w);
+ s->n_watches++;
+
+ return w;
+}
+
+static void watch_update(AvahiWatch *w, AvahiWatchEvent events) {
+ assert(w);
+ assert(!w->dead);
+
+ /* If there is a background thread running the poll() for us, tell it to exit the poll() */
+ avahi_simple_poll_wakeup(w->simple_poll);
+
+ w->pollfd.events = events;
+
+ if (w->idx != -1) {
+ assert(w->simple_poll);
+ w->simple_poll->pollfds[w->idx] = w->pollfd;
+ } else
+ w->simple_poll->rebuild_pollfds = 1;
+}
+
+static AvahiWatchEvent watch_get_events(AvahiWatch *w) {
+ assert(w);
+ assert(!w->dead);
+
+ if (w->idx != -1 && w->simple_poll->events_valid)
+ return w->simple_poll->pollfds[w->idx].revents;
+
+ return 0;
+}
+
+static void remove_pollfd(AvahiWatch *w) {
+ assert(w);
+
+ if (w->idx == -1)
+ return;
+
+ w->simple_poll->rebuild_pollfds = 1;
+}
+
+static void watch_free(AvahiWatch *w) {
+ assert(w);
+
+ assert(!w->dead);
+
+ /* If there is a background thread running the poll() for us, tell it to exit the poll() */
+ avahi_simple_poll_wakeup(w->simple_poll);
+
+ remove_pollfd(w);
+
+ w->dead = 1;
+ w->simple_poll->n_watches --;
+ w->simple_poll->watch_req_cleanup = 1;
+}
+
+static void destroy_watch(AvahiWatch *w) {
+ assert(w);
+
+ remove_pollfd(w);
+ AVAHI_LLIST_REMOVE(AvahiWatch, watches, w->simple_poll->watches, w);
+
+ if (!w->dead)
+ w->simple_poll->n_watches --;
+
+ avahi_free(w);
+}
+
+static void cleanup_watches(AvahiSimplePoll *s, int all) {
+ AvahiWatch *w, *next;
+ assert(s);
+
+ for (w = s->watches; w; w = next) {
+ next = w->watches_next;
+
+ if (all || w->dead)
+ destroy_watch(w);
+ }
+
+ s->timeout_req_cleanup = 0;
+}
+
+static AvahiTimeout* timeout_new(const AvahiPoll *api, const struct timeval *tv, AvahiTimeoutCallback callback, void *userdata) {
+ AvahiTimeout *t;
+ AvahiSimplePoll *s;
+
+ assert(api);
+ assert(callback);
+
+ s = api->userdata;
+ assert(s);
+
+ if (!(t = avahi_new(AvahiTimeout, 1)))
+ return NULL;
+
+ /* If there is a background thread running the poll() for us, tell it to exit the poll() */
+ avahi_simple_poll_wakeup(s);
+
+ t->simple_poll = s;
+ t->dead = 0;
+
+ if ((t->enabled = !!tv))
+ t->expiry = *tv;
+
+ t->callback = callback;
+ t->userdata = userdata;
+
+ AVAHI_LLIST_PREPEND(AvahiTimeout, timeouts, s->timeouts, t);
+ return t;
+}
+
+static void timeout_update(AvahiTimeout *t, const struct timeval *tv) {
+ assert(t);
+ assert(!t->dead);
+
+ /* If there is a background thread running the poll() for us, tell it to exit the poll() */
+ avahi_simple_poll_wakeup(t->simple_poll);
+
+ if ((t->enabled = !!tv))
+ t->expiry = *tv;
+}
+
+static void timeout_free(AvahiTimeout *t) {
+ assert(t);
+ assert(!t->dead);
+
+ /* If there is a background thread running the poll() for us, tell it to exit the poll() */
+ avahi_simple_poll_wakeup(t->simple_poll);
+
+ t->dead = 1;
+ t->simple_poll->timeout_req_cleanup = 1;
+}
+
+
+static void destroy_timeout(AvahiTimeout *t) {
+ assert(t);
+
+ AVAHI_LLIST_REMOVE(AvahiTimeout, timeouts, t->simple_poll->timeouts, t);
+
+ avahi_free(t);
+}
+
+static void cleanup_timeouts(AvahiSimplePoll *s, int all) {
+ AvahiTimeout *t, *next;
+ assert(s);
+
+ for (t = s->timeouts; t; t = next) {
+ next = t->timeouts_next;
+
+ if (all || t->dead)
+ destroy_timeout(t);
+ }
+
+ s->timeout_req_cleanup = 0;
+}
+
+AvahiSimplePoll *avahi_simple_poll_new(void) {
+ AvahiSimplePoll *s;
+
+ if (!(s = avahi_new(AvahiSimplePoll, 1)))
+ return NULL;
+
+ if (pipe(s->wakeup_pipe) < 0) {
+ avahi_free(s);
+ return NULL;
+ }
+
+ set_nonblock(s->wakeup_pipe[0]);
+ set_nonblock(s->wakeup_pipe[1]);
+
+ s->api.userdata = s;
+
+ s->api.watch_new = watch_new;
+ s->api.watch_free = watch_free;
+ s->api.watch_update = watch_update;
+ s->api.watch_get_events = watch_get_events;
+
+ s->api.timeout_new = timeout_new;
+ s->api.timeout_free = timeout_free;
+ s->api.timeout_update = timeout_update;
+
+ s->pollfds = NULL;
+ s->max_pollfds = s->n_pollfds = 0;
+ s->rebuild_pollfds = 1;
+ s->quit = 0;
+ s->n_watches = 0;
+ s->events_valid = 0;
+
+ s->watch_req_cleanup = 0;
+ s->timeout_req_cleanup = 0;
+
+ s->prepared_timeout = 0;
+
+ s->state = STATE_INIT;
+
+ s->wakeup_issued = 0;
+
+ avahi_simple_poll_set_func(s, NULL, NULL);
+
+ AVAHI_LLIST_HEAD_INIT(AvahiWatch, s->watches);
+ AVAHI_LLIST_HEAD_INIT(AvahiTimeout, s->timeouts);
+
+ return s;
+}
+
+void avahi_simple_poll_free(AvahiSimplePoll *s) {
+ assert(s);
+
+ cleanup_timeouts(s, 1);
+ cleanup_watches(s, 1);
+ assert(s->n_watches == 0);
+
+ avahi_free(s->pollfds);
+
+ if (s->wakeup_pipe[0] >= 0)
+ close(s->wakeup_pipe[0]);
+
+ if (s->wakeup_pipe[1] >= 0)
+ close(s->wakeup_pipe[1]);
+
+ avahi_free(s);
+}
+
+static int rebuild(AvahiSimplePoll *s) {
+ AvahiWatch *w;
+ int idx;
+
+ assert(s);
+
+ if (s->n_watches+1 > s->max_pollfds) {
+ struct pollfd *n;
+
+ s->max_pollfds = s->n_watches + 10;
+
+ if (!(n = avahi_realloc(s->pollfds, sizeof(struct pollfd) * s->max_pollfds)))
+ return -1;
+
+ s->pollfds = n;
+ }
+
+
+ s->pollfds[0].fd = s->wakeup_pipe[0];
+ s->pollfds[0].events = POLLIN;
+ s->pollfds[0].revents = 0;
+
+ idx = 1;
+
+ for (w = s->watches; w; w = w->watches_next) {
+
+ if(w->dead)
+ continue;
+
+ assert(w->idx < s->max_pollfds);
+ s->pollfds[w->idx = idx++] = w->pollfd;
+ }
+
+ s->n_pollfds = idx;
+ s->events_valid = 0;
+ s->rebuild_pollfds = 0;
+
+ return 0;
+}
+
+static AvahiTimeout* find_next_timeout(AvahiSimplePoll *s) {
+ AvahiTimeout *t, *n = NULL;
+ assert(s);
+
+ for (t = s->timeouts; t; t = t->timeouts_next) {
+
+ if (t->dead || !t->enabled)
+ continue;
+
+ if (!n || avahi_timeval_compare(&t->expiry, &n->expiry) < 0)
+ n = t;
+ }
+
+ return n;
+}
+
+static void timeout_callback(AvahiTimeout *t) {
+ assert(t);
+ assert(!t->dead);
+ assert(t->enabled);
+
+ t->enabled = 0;
+ t->callback(t, t->userdata);
+}
+
+int avahi_simple_poll_prepare(AvahiSimplePoll *s, int timeout) {
+ AvahiTimeout *next_timeout;
+
+ assert(s);
+ assert(s->state == STATE_INIT || s->state == STATE_DISPATCHED || s->state == STATE_FAILURE);
+ s->state = STATE_PREPARING;
+
+ /* Clear pending wakeup requests */
+ clear_wakeup(s);
+
+ /* Cleanup things first */
+ if (s->watch_req_cleanup)
+ cleanup_watches(s, 0);
+
+ if (s->timeout_req_cleanup)
+ cleanup_timeouts(s, 0);
+
+ /* Check whether a quit was requested */
+ if (s->quit) {
+ s->state = STATE_QUIT;
+ return 1;
+ }
+
+ /* Do we need to rebuild our array of pollfds? */
+ if (s->rebuild_pollfds)
+ if (rebuild(s) < 0) {
+ s->state = STATE_FAILURE;
+ return -1;
+ }
+
+ /* Calculate the wakeup time */
+ if ((next_timeout = find_next_timeout(s))) {
+ struct timeval now;
+ int t;
+ AvahiUsec usec;
+
+ if (next_timeout->expiry.tv_sec == 0 &&
+ next_timeout->expiry.tv_usec == 0) {
+
+ /* Just a shortcut so that we don't need to call gettimeofday() */
+ timeout = 0;
+ goto finish;
+ }
+
+ gettimeofday(&now, NULL);
+ usec = avahi_timeval_diff(&next_timeout->expiry, &now);
+
+ if (usec <= 0) {
+ /* Timeout elapsed */
+
+ timeout = 0;
+ goto finish;
+ }
+
+ /* Calculate sleep time. We add 1ms because otherwise we'd
+ * wake up too early most of the time */
+ t = (int) (usec / 1000) + 1;
+
+ if (timeout < 0 || timeout > t)
+ timeout = t;
+ }
+
+finish:
+ s->prepared_timeout = timeout;
+ s->state = STATE_PREPARED;
+ return 0;
+}
+
+int avahi_simple_poll_run(AvahiSimplePoll *s) {
+ assert(s);
+ assert(s->state == STATE_PREPARED || s->state == STATE_FAILURE);
+
+ s->state = STATE_RUNNING;
+
+ for (;;) {
+ errno = 0;
+
+ if (s->poll_func(s->pollfds, s->n_pollfds, s->prepared_timeout, s->poll_func_userdata) < 0) {
+
+ if (errno == EINTR)
+ continue;
+
+ s->state = STATE_FAILURE;
+ return -1;
+ }
+
+ break;
+ }
+
+ /* The poll events are now valid again */
+ s->events_valid = 1;
+
+ /* Update state */
+ s->state = STATE_RAN;
+ return 0;
+}
+
+int avahi_simple_poll_dispatch(AvahiSimplePoll *s) {
+ AvahiTimeout *next_timeout;
+ AvahiWatch *w;
+
+ assert(s);
+ assert(s->state == STATE_RAN);
+ s->state = STATE_DISPATCHING;
+
+ /* We execute only on callback in every iteration */
+
+ /* Check whether the wakeup time has been reached now */
+ if ((next_timeout = find_next_timeout(s))) {
+
+ if (next_timeout->expiry.tv_sec == 0 && next_timeout->expiry.tv_usec == 0) {
+
+ /* Just a shortcut so that we don't need to call gettimeofday() */
+ timeout_callback(next_timeout);
+ goto finish;
+ }
+
+ if (avahi_age(&next_timeout->expiry) >= 0) {
+
+ /* Timeout elapsed */
+ timeout_callback(next_timeout);
+ goto finish;
+ }
+ }
+
+ /* Look for some kind of I/O event */
+ for (w = s->watches; w; w = w->watches_next) {
+
+ if (w->dead)
+ continue;
+
+ assert(w->idx >= 0);
+ assert(w->idx < s->n_pollfds);
+
+ if (s->pollfds[w->idx].revents != 0) {
+ w->callback(w, w->pollfd.fd, s->pollfds[w->idx].revents, w->userdata);
+ goto finish;
+ }
+ }
+
+finish:
+
+ s->state = STATE_DISPATCHED;
+ return 0;
+}
+
+int avahi_simple_poll_iterate(AvahiSimplePoll *s, int timeout) {
+ int r;
+
+ if ((r = avahi_simple_poll_prepare(s, timeout)) != 0)
+ return r;
+
+ if ((r = avahi_simple_poll_run(s)) != 0)
+ return r;
+
+ if ((r = avahi_simple_poll_dispatch(s)) != 0)
+ return r;
+
+ return 0;
+}
+
+void avahi_simple_poll_quit(AvahiSimplePoll *s) {
+ assert(s);
+
+ s->quit = 1;
+
+ /* If there is a background thread running the poll() for us, tell it to exit the poll() */
+ avahi_simple_poll_wakeup(s);
+}
+
+const AvahiPoll* avahi_simple_poll_get(AvahiSimplePoll *s) {
+ assert(s);
+
+ return &s->api;
+}
+
+static int system_poll(struct pollfd *ufds, unsigned int nfds, int timeout, AVAHI_GCC_UNUSED void *userdata) {
+ return poll(ufds, nfds, timeout);
+}
+
+void avahi_simple_poll_set_func(AvahiSimplePoll *s, AvahiPollFunc func, void *userdata) {
+ assert(s);
+
+ s->poll_func = func ? func : system_poll;
+ s->poll_func_userdata = func ? userdata : NULL;
+
+ /* If there is a background thread running the poll() for us, tell it to exit the poll() */
+ avahi_simple_poll_wakeup(s);
+}
+
+int avahi_simple_poll_loop(AvahiSimplePoll *s) {
+ int r;
+
+ assert(s);
+
+ for (;;)
+ if ((r = avahi_simple_poll_iterate(s, -1)) != 0)
+ if (r >= 0 || errno != EINTR)
+ return r;
+}
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