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/***************************************************************************
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* Copyright (C) 05/2009 by Olaf Rempel *
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* razzor@kopf-tisch.de *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; version 2 of the License *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, write to the *
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* Free Software Foundation, Inc., *
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
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***************************************************************************/
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <signal.h>
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#include "event.h"
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#include "list.h"
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#include "logging.h"
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#include "signals.h"
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struct signal_entry {
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struct list_head list;
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int signum;
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int deleted;
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void (*callback)(void *privdata);
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void *privdata;
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};
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static LIST_HEAD(callback_list);
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static int sig_pipe[2];
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static void sig_handler(int signal)
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{
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unsigned char signum = (signal & 0xFF);
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write(sig_pipe[1], &signum, 1);
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}
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int signal_remove_callback(int signum, int type)
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{
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/* mark all old handler for deletion */
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struct signal_entry *search;
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list_for_each_entry(search, &callback_list, list) {
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if (search->signum == signum)
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search->deleted = 1;
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}
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struct sigaction sig_action;
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switch (type) {
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case SIG_IGNORE:
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sig_action.sa_handler = SIG_IGN;
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break;
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default:
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case SIG_DEFAULT:
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sig_action.sa_handler = SIG_DFL;
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break;
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}
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if (sigaction(signum, &sig_action, NULL) < 0) {
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log_print(LOG_WARN, "signal_remove_callback(): sigaction()");
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return -1;
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}
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/* trigger remove */
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sig_handler(0);
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return 0;
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}
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int signal_set_callback(int signum, void (*callback)(void *privdata), void *privdata)
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{
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signal_remove_callback(signum, SIG_DEFAULT);
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struct signal_entry *entry = malloc(sizeof(struct signal_entry));
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if (entry == NULL) {
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log_print(LOG_WARN, "signal_add_callback(): out of memory");
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return -1;
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}
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entry->signum = signum;
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entry->deleted = 0;
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entry->callback = callback;
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entry->privdata = privdata;
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list_add_tail(&entry->list, &callback_list);
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struct sigaction sig_action = {
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.sa_handler = sig_handler,
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};
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if (sigaction(signum, &sig_action, NULL) < 0) {
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log_print(LOG_WARN, "signal_add_callback(): sigaction()");
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list_del(&entry->list);
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free(entry);
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return -1;
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}
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return 0;
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}
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static int sig_event(int fd, void *privdata)
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{
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unsigned char signum;
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int len = read(fd, &signum, 1);
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if (len <= 0) {
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log_print(LOG_WARN, "sig_event(): read()");
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return -1;
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}
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struct signal_entry *search, *tmp;
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list_for_each_entry_safe(search, tmp, &callback_list, list) {
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if (search->deleted) {
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list_del(&search->list);
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free(search);
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continue;
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}
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if (search->signum == signum)
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search->callback(search->privdata);
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}
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return 0;
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}
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int signal_init(void)
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{
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if (pipe(sig_pipe) < 0) {
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log_print(LOG_ERROR, "signal_init(): pipe()");
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return -1;
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}
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if (fcntl(sig_pipe[0], F_SETFD, FD_CLOEXEC) < 0) {
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log_print(LOG_WARN, "signal_init(): fcntl(FD_CLOEXEC)");
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return -1;
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}
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if (fcntl(sig_pipe[1], F_SETFD, FD_CLOEXEC) < 0) {
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log_print(LOG_WARN, "signal_init(): fcntl(FD_CLOEXEC)");
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return -1;
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}
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event_add_readfd(NULL, sig_pipe[0], sig_event, NULL);
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return 0;
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}
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@ -0,0 +1,12 @@
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#ifndef _SIGNALS_H
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#define _SIGNALS_H
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#define SIG_DEFAULT 0x00
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#define SIG_IGNORE 0x01
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int signal_remove_callback(int signum, int type);
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int signal_set_callback(int signum, void (*callback)(void *privdata), void *privdata);
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int signal_init(void);
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#endif // _SIGNALS_H
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