1 /* ========================================================================

2 * Copyright 1988-2006 University of Washington

3 *

4 * Licensed under the Apache License, Version 2.0 (the "License");

5 * you may not use this file except in compliance with the License.

6 * You may obtain a copy of the License at

7 *

8 * http://www.apache.org/licenses/LICENSE-2.0

9 *

10 *

11 * ========================================================================

12 */

13

14 /*

15 * Program: POSIX Signals

16 *

17 * Author: Mark Crispin

18 * Networks and Distributed Computing

19 * Computing & Communications

20 * University of Washington

21 * Administration Building, AG-44

22 * Seattle, WA 98195

23 * Internet: MRC@CAC.Washington.EDU

24 *

25 * Date: 29 April 1997

26 * Last Edited: 30 August 2006

27 */

28 

29 #include <signal.h>

30 #include <string.h>

31

32 #ifndef SA_RESTART

33 #define SA_RESTART 0

34 #endif

35

36 /* Arm a signal

37 * Accepts: signal number

38 * desired action

39 * Returns: old action

40 */

41

42 void *arm_signal (int sig,void *action)

43 {

44 struct sigaction nact,oact;

45 memset (&nact,0,sizeof (struct sigaction));

46 sigemptyset (&nact.sa_mask); /* no signals blocked */

47 nact.sa_handler = action; /* set signal handler */

48 nact.sa_flags = SA_RESTART; /* needed on Linux, nice on SVR4 */

49 sigaction (sig,&nact,&oact); /* do the signal action */

50 return (void *) oact.sa_handler;

51 }