gbasys
annotate src/signal.c @ 7:72c6429ae953
changed all the copyright headers and added a README
| author | John Tsiombikas <nuclear@member.fsf.org> |
|---|---|
| date | Fri, 18 Apr 2014 02:04:46 +0300 |
| parents | 06726f0b8cd3 |
| children |
| rev | line source |
|---|---|
| nuclear@0 | 1 /* |
| nuclear@7 | 2 gbasys - a gameboy advance hardware abstraction library |
| nuclear@7 | 3 Copyright (C) 2004-2014 John Tsiombikas <nuclear@member.fsf.org> |
| nuclear@0 | 4 |
| nuclear@7 | 5 This program is free software: you can redistribute it and/or modify |
| nuclear@0 | 6 it under the terms of the GNU General Public License as published by |
| nuclear@7 | 7 the Free Software Foundation, either version 3 of the License, or |
| nuclear@0 | 8 (at your option) any later version. |
| nuclear@0 | 9 |
| nuclear@0 | 10 This program is distributed in the hope that it will be useful, |
| nuclear@0 | 11 but WITHOUT ANY WARRANTY; without even the implied warranty of |
| nuclear@0 | 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| nuclear@0 | 13 GNU General Public License for more details. |
| nuclear@0 | 14 |
| nuclear@0 | 15 You should have received a copy of the GNU General Public License |
| nuclear@7 | 16 along with this program. If not, see <http://www.gnu.org/licenses/>. |
| nuclear@0 | 17 */ |
| nuclear@0 | 18 #include "signal.h" |
| nuclear@0 | 19 #include "intr.h" |
| nuclear@0 | 20 |
| nuclear@0 | 21 static void sig_invalid_handler(int signum) { |
| nuclear@0 | 22 panic("signal error"); |
| nuclear@0 | 23 } |
| nuclear@0 | 24 |
| nuclear@0 | 25 static sighandler_t signal_handler[SIG_MAX]; |
| nuclear@0 | 26 static sighandler_t default_sig_handler[SIG_MAX]; |
| nuclear@0 | 27 static volatile int wait_for_signal; |
| nuclear@0 | 28 static sighandler_t saved_signal; |
| nuclear@0 | 29 |
| nuclear@0 | 30 void sig_init(void) { |
| nuclear@0 | 31 int i; |
| nuclear@2 | 32 |
| nuclear@0 | 33 for(i=0; i<SIG_MAX; i++) { |
| nuclear@0 | 34 default_sig_handler[i] = sig_invalid_handler; |
| nuclear@0 | 35 } |
| nuclear@2 | 36 |
| nuclear@0 | 37 default_sig_handler[SIGALRM] = SIG_IGN; |
| nuclear@0 | 38 default_sig_handler[SIGUSR1] = SIG_IGN; |
| nuclear@0 | 39 default_sig_handler[SIGUSR2] = SIG_IGN; |
| nuclear@0 | 40 default_sig_handler[SIGIO] = SIG_IGN; |
| nuclear@3 | 41 default_sig_handler[SIGTTIN] = SIG_IGN; |
| nuclear@0 | 42 for(i=0; i<SIG_MAX; i++) { |
| nuclear@0 | 43 signal_handler[i] = default_sig_handler[i]; |
| nuclear@0 | 44 } |
| nuclear@0 | 45 } |
| nuclear@0 | 46 |
| nuclear@0 | 47 sighandler_t signal(int signum, sighandler_t handler) { |
| nuclear@0 | 48 sighandler_t prev = signal_handler[signum]; |
| nuclear@2 | 49 |
| nuclear@0 | 50 signal_handler[signum] = handler == SIG_IGN ? 0 : (handler == SIG_DFL ? default_sig_handler[signum] : handler); |
| nuclear@2 | 51 |
| nuclear@0 | 52 return prev; |
| nuclear@0 | 53 } |
| nuclear@0 | 54 |
| nuclear@0 | 55 int raise(int signum) { |
| nuclear@0 | 56 if(signal_handler[signum] != SIG_IGN) { |
| nuclear@0 | 57 signal_handler[signum](signum); |
| nuclear@0 | 58 wait_for_signal = 0; |
| nuclear@0 | 59 } |
| nuclear@0 | 60 return 0; |
| nuclear@0 | 61 } |
| nuclear@0 | 62 |
| nuclear@0 | 63 int pause(void) { |
| nuclear@0 | 64 clr_int(); |
| nuclear@0 | 65 wait_for_signal = 1; |
| nuclear@0 | 66 set_int(); |
| nuclear@0 | 67 |
| nuclear@0 | 68 while(wait_for_signal); |
| nuclear@2 | 69 |
| nuclear@0 | 70 /*errno = EINTR;*/ |
| nuclear@0 | 71 return -1; |
| nuclear@0 | 72 } |
| nuclear@0 | 73 |
| nuclear@0 | 74 void save_signal(int signum) { |
| nuclear@0 | 75 saved_signal = signal_handler[signum]; |
| nuclear@0 | 76 } |
| nuclear@0 | 77 |
| nuclear@0 | 78 void restore_signal(int signum) { |
| nuclear@0 | 79 signal_handler[signum] = saved_signal; |
| nuclear@0 | 80 } |
| nuclear@2 | 81 |
| nuclear@2 | 82 sighandler_t signal_func(int signum) |
| nuclear@2 | 83 { |
| nuclear@2 | 84 return signal_handler[signum]; |
| nuclear@2 | 85 } |