+++ /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 "llist.h"
-#include "malloc.h"
-#include "timeval.h"
-#include "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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