avahi-libevent/libevent-watch-test.c

/***
  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 <stdio.h>
#include <unistd.h>
#include <assert.h>
#include <errno.h>
#include <string.h>

#include <event2/event.h>

#include <avahi-common/watch.h>
#include <avahi-common/timeval.h>
#include <avahi-common/gccmacro.h>

#include "libevent-watch.h"

static const AvahiPoll *api = NULL;
static struct event_base *base = NULL;

static void callback(AvahiWatch *w, int fd, AvahiWatchEvent event, AVAHI_GCC_UNUSED void *userdata)
{
    if (event & AVAHI_WATCH_IN) {
        ssize_t r;
        char c;

        if ((r = read(fd, &c, 1)) <= 0) {
            fprintf(stderr, "read() failed: %s\n", r < 0 ? strerror(errno) : "EOF");
            api->watch_free(w);
            return;
        }

        printf("Read: %c\n", c >= 32 && c < 127 ? c : '.');
    }
}

static void wakeup(AvahiTimeout *t, AVAHI_GCC_UNUSED void *userdata)
{
    struct timeval tv;
    static unsigned i = 0;

    printf("Wakeup #%u\n", i++);

    if (i > 10)
	event_base_loopbreak(base);

    avahi_elapse_time(&tv, 1000, 0);
    api->timeout_update(t, &tv);
}

int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char *argv[])
{
    AvahiLibeventPoll *ep;
    struct timeval tv;

    base = event_base_new();
    assert(base);

    ep = avahi_libevent_poll_new(base);
    assert(ep);

    api = avahi_libevent_poll_get(ep);

    api->watch_new(api, 0, AVAHI_WATCH_IN, callback, NULL);

    avahi_elapse_time(&tv, 1000, 0);
    api->timeout_new(api, &tv, wakeup, NULL);

    event_base_dispatch(base);

    avahi_libevent_poll_free(ep);

    event_base_free(base);

    return 0;
}