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/* $Id$ */
/*
* This file is part of libdaemon.
*
* libdaemon 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.
*
* libdaemon 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 libdaemon; 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 <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <stdarg.h>
#include <signal.h>
#include "dsignal.h"
#include "dlog.h"
#include "dnonblock.h"
static int _signal_pipe[2] = { -1, -1 };
static void _sigfunc(int s) {
write(_signal_pipe[1], &s, sizeof(s));
}
static int _init(void) {
if (_signal_pipe[0] < 0 || _signal_pipe[1] < 0) {
if (pipe(_signal_pipe) < 0) {
daemon_log(LOG_ERR, "pipe(): %s", strerror(errno));
return -1;
}
if (daemon_nonblock(_signal_pipe[0], 1) < 0 || daemon_nonblock(_signal_pipe[1], 1) < 0)
return -1;
}
return 0;
}
int daemon_signal_install(int s){
sigset_t ss;
struct sigaction sa;
if (_init() < 0)
return -1;
if (sigemptyset(&ss) < 0) {
daemon_log(LOG_ERR, "sigemptyset(): %s", strerror(errno));
return -1;
}
if (sigaddset(&ss, s) < 0) {
daemon_log(LOG_ERR, "sigaddyset(): %s", strerror(errno));
return -1;
}
if (sigprocmask(SIG_UNBLOCK, &ss, NULL) < 0) {
daemon_log(LOG_ERR, "sigprocmask(): %s", strerror(errno));
return -1;
}
memset(&sa, 0, sizeof(sa));
sa.sa_handler = _sigfunc;
sigemptyset(&sa.sa_mask);
sa.sa_flags = SA_RESTART;
if (sigaction(s, &sa, NULL) < 0) {
daemon_log(LOG_ERR, "sigaction(%s, ...) failed: %s", strsignal(s), strerror(errno));
return -1;
}
return 0;
}
int daemon_signal_init(int s, ...) {
int sig, r = 0;
va_list ap;
va_start(ap, s);
if (_init() < 0)
return -1;
sig = s;
while (sig > 0) {
if (daemon_signal_install(sig) < 0) {
r = -1;
break;
}
sig = va_arg(ap, int);
}
va_end(ap);
return r;
}
void daemon_signal_done(void) {
if (_signal_pipe[0] != -1)
close(_signal_pipe[0]);
if (_signal_pipe[1] != -1)
close(_signal_pipe[1]);
_signal_pipe[0] = _signal_pipe[1] = -1;
}
int daemon_signal_next(void) {
int s;
ssize_t r;
if ((r = read(_signal_pipe[0], &s, sizeof(s))) == sizeof(s))
return s;
if (r < 0) {
if (errno == EAGAIN)
return 0;
else {
daemon_log(LOG_ERR, "read(signal_pipe[0], ...): %s", strerror(errno));
return -1;
}
}
daemon_log(LOG_ERR, "Short read() on signal pipe.");
return -1;
}
int daemon_signal_fd(void) {
return _signal_pipe[0];
}
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