1 /*

2 Copyright 2004 John Tsiombikas <nuclear@siggraph.org>

3

4 This file is part of libgba, a library for GameBoy Advance development.

5

6 This program is free software; you can redistribute it and/or modify

7 it under the terms of the GNU General Public License as published by

8 the Free Software Foundation; either version 2 of the License, or

9 (at your option) any later version.

10

11 This program is distributed in the hope that it will be useful,

12 but WITHOUT ANY WARRANTY; without even the implied warranty of

13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

14 GNU General Public License for more details.

15

16 You should have received a copy of the GNU General Public License

17 along with this program; if not, write to the Free Software

18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

19 */

20

21 #include "signal.h"

22 #include "intr.h"

23

24 static void sig_invalid_handler(int signum) {

25 panic("signal error");

26 }

27

28 static sighandler_t signal_handler[SIG_MAX];

29 static sighandler_t default_sig_handler[SIG_MAX];

30 static volatile int wait_for_signal;

31 static sighandler_t saved_signal;

32

33 void sig_init(void) {

34 int i;

35

36 for(i=0; i<SIG_MAX; i++) {

37 default_sig_handler[i] = sig_invalid_handler;

38 }

39

40 default_sig_handler[SIGALRM] = SIG_IGN;

41 default_sig_handler[SIGUSR1] = SIG_IGN;

42 default_sig_handler[SIGUSR2] = SIG_IGN;

43 default_sig_handler[SIGIO] = SIG_IGN;

44 for(i=0; i<SIG_MAX; i++) {

45 signal_handler[i] = default_sig_handler[i];

46 }

47 }

48

49 sighandler_t signal(int signum, sighandler_t handler) {

50 sighandler_t prev = signal_handler[signum];

51

52 signal_handler[signum] = handler == SIG_IGN ? 0 : (handler == SIG_DFL ? default_sig_handler[signum] : handler);

53

54 return prev;

55 }

56

57 int raise(int signum) {

58 if(signal_handler[signum] != SIG_IGN) {

59 signal_handler[signum](signum);

60 wait_for_signal = 0;

61 }

62 return 0;

63 }

64

65 int pause(void) {

66 clr_int();

67 wait_for_signal = 1;

68 set_int();

69

70 while(wait_for_signal);

71

72 /*errno = EINTR;*/

73 return -1;

74 }

75

76 void save_signal(int signum) {

77 saved_signal = signal_handler[signum];

78 }

79

80 void restore_signal(int signum) {

81 signal_handler[signum] = saved_signal;

82 }