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1 /*
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2 Copyright 2004 John Tsiombikas <nuclear@siggraph.org>
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3
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4 This file is part of libgba, a library for GameBoy Advance development.
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5
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6 This program is free software; you can redistribute it and/or modify
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7 it under the terms of the GNU General Public License as published by
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8 the Free Software Foundation; either version 2 of the License, or
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9 (at your option) any later version.
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10
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11 This program is distributed in the hope that it will be useful,
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 GNU General Public License for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with this program; if not, write to the Free Software
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18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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19 */
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20
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21 #include "signal.h"
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22 #include "intr.h"
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23
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24 static void sig_invalid_handler(int signum) {
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25 panic("signal error");
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26 }
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27
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28 static sighandler_t signal_handler[SIG_MAX];
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29 static sighandler_t default_sig_handler[SIG_MAX];
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30 static volatile int wait_for_signal;
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31 static sighandler_t saved_signal;
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32
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33 void sig_init(void) {
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34 int i;
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35
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36 for(i=0; i<SIG_MAX; i++) {
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37 default_sig_handler[i] = sig_invalid_handler;
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38 }
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39
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40 default_sig_handler[SIGALRM] = SIG_IGN;
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41 default_sig_handler[SIGUSR1] = SIG_IGN;
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42 default_sig_handler[SIGUSR2] = SIG_IGN;
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43 default_sig_handler[SIGIO] = SIG_IGN;
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44 for(i=0; i<SIG_MAX; i++) {
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45 signal_handler[i] = default_sig_handler[i];
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46 }
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47 }
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48
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49 sighandler_t signal(int signum, sighandler_t handler) {
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50 sighandler_t prev = signal_handler[signum];
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51
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52 signal_handler[signum] = handler == SIG_IGN ? 0 : (handler == SIG_DFL ? default_sig_handler[signum] : handler);
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53
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54 return prev;
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55 }
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56
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57 int raise(int signum) {
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58 if(signal_handler[signum] != SIG_IGN) {
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59 signal_handler[signum](signum);
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60 wait_for_signal = 0;
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61 }
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62 return 0;
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63 }
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64
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65 int pause(void) {
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66 clr_int();
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67 wait_for_signal = 1;
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68 set_int();
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69
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70 while(wait_for_signal);
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71
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72 /*errno = EINTR;*/
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73 return -1;
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74 }
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75
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76 void save_signal(int signum) {
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77 saved_signal = signal_handler[signum];
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78 }
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79
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80 void restore_signal(int signum) {
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81 signal_handler[signum] = saved_signal;
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82 }
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