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Full Discussion: Trying to block signal
Top Forums UNIX for Dummies Questions & Answers Trying to block signal Post 302465034 by joker40 on Thursday 21st of October 2010 02:00:16 PM
Old 10-21-2010
Trying to block signal
I have this code that doesnt do what it is suppose to do. It should block signal that I send while process is running. I press control+z while this process is running and it should be blocked but it isnt. When i press control+z it gives me this....
[1]+ Stopped
When I change SIGTSP into SIGINT then it works as it should. I press control+c and it ignores it and continues executing my program.
Can anyone tell me why this is happening.

Code:
  sigset_t s;
  int j = 0;
  sigemptyset(&s);
  sigaddset(&first,SIGTSTP);

  for (i = 0 ; i < 10 ; i++){
     sleep(5);
     if ( sigprocmask(SIG_BLOCK,&first,NULL)==-1)
        break;

     fprintf("print something here\n");

  }

 

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LEARN ABOUT MINIX

sigset

SIGSET(3)						     Library Functions Manual							 SIGSET(3)

NAME

       sigset, sigaddset, sigdelset, sigemptyset, sigfillset, sigismember - manipulate signal sets

SYNOPSIS

       #include <signal.h>

       int sigaddset(sigset_t *set, int sig)
       int sigdelset(sigset_t *set, int sig)
       int sigemptyset(sigset_t *set)
       int sigfillset(sigset_t *set)
       int sigismember(const sigset_t *set, int sig)

DESCRIPTION

       The  system calls that handle signals, such as sigaction(2) and sigprocmask(2) use sets of signals to keep a process from being interrupted
       by those signals while executing a signal handler or a critical code segment.  These signal sets are manipulated  by  the  following  func-
       tions:

       int sigaddset(sigset_t *set, int sig)
	    Add signal sig to the signal set referenced by set.

       int sigdelset(sigset_t *set, int sig)
	    Remove signal sig from the signal set referenced by set.

       int sigemptyset(sigset_t *set)
	    Initialize the signal set referenced by set to an empty set.

       int sigfillset(sigset_t *set)
	    Initialize the signal set referenced by set to an full set, i.e. all signals are in the set.

       int sigismember(const sigset_t *set, int sig)
	    Return 1 if the signal sig is present in the set referenced by set, 0 otherwise.

SEE ALSO

       sigaction(2), sigpending(2), sigprocmask(2), sigsuspend(2).

DIAGNOSTICS

       All functions except sigismember return 0 on success.  Sigismember returns 0 or 1 on success.  They return -1 with error code EINVAL for an
       invalid signal number.  (They do not use EFAULT for a bad set address, but will simply cause a segmentation violation.)

AUTHOR

       Kees J. Bot (kjb@cs.vu.nl)

																	 SIGSET(3)
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