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SIGSETOPS(3)               Linux Programmer's Manual              SIGSETOPS(3)



NAME
       sigemptyset, sigfillset, sigaddset, sigdelset, sigismember - POSIX sig-
       nal set operations.


SYNOPSIS
       #include<signal.h>


       intsigemptyset(sigset_t*set);

       intsigfillset(sigset_t*set);

       intsigaddset(sigset_t*set,int signum);

       intsigdelset(sigset_t*set,int signum);

       intsigismember(constsigset_t*set,int signum);


DESCRIPTION
       The sigsetops(3) functions allow the manipulation of POSIX signal sets.

       sigemptyset  initializes the signal set given by set to empty, with all
       signals excluded from the set.

       sigfillset initializes set to full, including all signals.

       sigaddset and sigdelset add and delete respectively signal signum  from
       set.

       sigismember tests whether signum is a member of set.

RETURNVALUE
       sigemptyset,  sigfillset,  sigaddset  and sigdelset return 0 on success
       and -1 on error.

       sigismember returns 1 if signum is a member of set, 0 if signum is  not
       a member, and -1 on error.

ERRORS
       EINVAL sig is not a valid signal.

CONFORMINGTO
       POSIX

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



Linux 1.0                         1994-09-24                      SIGSETOPS(3)