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/***
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 <unistd.h>
#include <assert.h>
#include <string.h>
#include <errno.h>
#include <signal.h>
#include <fcntl.h>
#include <stdio.h>
#include <avahi-common/gccmacro.h>
#include "sigint.h"
static AvahiSimplePoll *simple_poll = NULL;
static struct sigaction old_sigint_sa, old_sigterm_sa;
static int pipe_fds[2] = { -1, -1 };
static AvahiWatch *watch = NULL;
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 void handler(int s) {
write(pipe_fds[1], &s, sizeof(s));
}
static void close_pipe_fds(void) {
if (pipe_fds[0] >= 0)
close(pipe_fds[0]);
if (pipe_fds[1] >= 0)
close(pipe_fds[1]);
pipe_fds[0] = pipe_fds[1] = -1;
}
static void watch_callback(AvahiWatch *w, int fd, AvahiWatchEvent event, AVAHI_GCC_UNUSED void *userdata) {
int s;
ssize_t l;
assert(w);
assert(fd == pipe_fds[0]);
assert(event == AVAHI_WATCH_IN);
l = read(fd, &s, sizeof(s));
assert(l == sizeof(s));
fprintf(stderr, "Got %s, quitting.\n", s == SIGINT ? "SIGINT" : "SIGTERM");
avahi_simple_poll_quit(simple_poll);
}
int sigint_install(AvahiSimplePoll *spoll) {
struct sigaction sa;
const AvahiPoll *p;
assert(spoll);
assert(!simple_poll);
assert(pipe_fds[0] == -1 && pipe_fds[1] == -1);
if (pipe(pipe_fds) < 0) {
fprintf(stderr, "pipe() failed: %s\n", strerror(errno));
return -1;
}
set_nonblock(pipe_fds[0]);
set_nonblock(pipe_fds[1]);
memset(&sa, 0, sizeof(sa));
sa.sa_handler = handler;
sa.sa_flags = SA_RESTART;
if (sigaction(SIGINT, &sa, &old_sigint_sa) < 0) {
fprintf(stderr, "sigaction() failed: %s\n", strerror(errno));
close_pipe_fds();
return -1;
}
if (sigaction(SIGTERM, &sa, &old_sigterm_sa) < 0) {
sigaction(SIGINT, &old_sigint_sa, NULL);
fprintf(stderr, "sigaction() failed: %s\n", strerror(errno));
close_pipe_fds();
return -1;
}
p = avahi_simple_poll_get(spoll);
watch = p->watch_new(p, pipe_fds[0], AVAHI_WATCH_IN, watch_callback, NULL);
assert(watch);
simple_poll = spoll;
return 0;
}
void sigint_uninstall(void) {
if (!simple_poll)
return;
sigaction(SIGTERM, &old_sigterm_sa, NULL);
sigaction(SIGINT, &old_sigint_sa, NULL);
close_pipe_fds();
if (watch) {
const AvahiPoll *p;
assert(simple_poll);
p = avahi_simple_poll_get(simple_poll);
p->watch_free(watch);
watch = NULL;
}
simple_poll = NULL;
}
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