nuclear@0: /*
nuclear@0: Copyright 2004 John Tsiombikas <nuclear@siggraph.org>
nuclear@0: 
nuclear@0: This file is part of libgba, a library for GameBoy Advance development.
nuclear@0: 
nuclear@0: This program is free software; you can redistribute it and/or modify
nuclear@0: it under the terms of the GNU General Public License as published by
nuclear@0: the Free Software Foundation; either version 2 of the License, or
nuclear@0: (at your option) any later version.
nuclear@0: 
nuclear@0: This program is distributed in the hope that it will be useful,
nuclear@0: but WITHOUT ANY WARRANTY; without even the implied warranty of
nuclear@0: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
nuclear@0: GNU General Public License for more details.
nuclear@0: 
nuclear@0: You should have received a copy of the GNU General Public License
nuclear@0: along with this program; if not, write to the Free Software
nuclear@0: Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
nuclear@0: */
nuclear@0: 
nuclear@0: #include "signal.h"
nuclear@0: #include "intr.h"
nuclear@0: 
nuclear@0: static void sig_invalid_handler(int signum) {
nuclear@0: 	panic("signal error");
nuclear@0: }
nuclear@0: 
nuclear@0: static sighandler_t signal_handler[SIG_MAX];
nuclear@0: static sighandler_t default_sig_handler[SIG_MAX];
nuclear@0: static volatile int wait_for_signal;
nuclear@0: static sighandler_t saved_signal;
nuclear@0: 
nuclear@0: void sig_init(void) {
nuclear@0: 	int i;
nuclear@0: 	
nuclear@0: 	for(i=0; i<SIG_MAX; i++) {
nuclear@0: 		default_sig_handler[i] = sig_invalid_handler;
nuclear@0: 	}
nuclear@0: 	
nuclear@0: 	default_sig_handler[SIGALRM] = SIG_IGN;
nuclear@0: 	default_sig_handler[SIGUSR1] = SIG_IGN;
nuclear@0: 	default_sig_handler[SIGUSR2] = SIG_IGN;
nuclear@0: 	default_sig_handler[SIGIO] = SIG_IGN;
nuclear@0: 	for(i=0; i<SIG_MAX; i++) {
nuclear@0: 		signal_handler[i] = default_sig_handler[i];
nuclear@0: 	}
nuclear@0: }
nuclear@0: 
nuclear@0: sighandler_t signal(int signum, sighandler_t handler) {
nuclear@0: 	sighandler_t prev = signal_handler[signum];
nuclear@0: 	
nuclear@0: 	signal_handler[signum] = handler == SIG_IGN ? 0 : (handler == SIG_DFL ? default_sig_handler[signum] : handler);
nuclear@0: 	
nuclear@0: 	return prev;
nuclear@0: }
nuclear@0: 
nuclear@0: int raise(int signum) {
nuclear@0: 	if(signal_handler[signum] != SIG_IGN) {
nuclear@0: 		signal_handler[signum](signum);
nuclear@0: 		wait_for_signal = 0;
nuclear@0: 	}
nuclear@0: 	return 0;
nuclear@0: }
nuclear@0: 
nuclear@0: int pause(void) {
nuclear@0: 	clr_int();
nuclear@0: 	wait_for_signal = 1;
nuclear@0: 	set_int();
nuclear@0: 
nuclear@0: 	while(wait_for_signal);
nuclear@0: 	
nuclear@0: 	/*errno = EINTR;*/
nuclear@0: 	return -1;
nuclear@0: }
nuclear@0: 
nuclear@0: void save_signal(int signum) {
nuclear@0: 	saved_signal = signal_handler[signum];
nuclear@0: }
nuclear@0: 
nuclear@0: void restore_signal(int signum) {
nuclear@0: 	signal_handler[signum] = saved_signal;
nuclear@0: }