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)