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SIGSETOPS(3)	       FreeBSD Library Functions Manual		  SIGSETOPS(3)

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

LIBRARY
     Standard C	Library	(libc, -lc)

SYNOPSIS
     #include <signal.h>

     int
     sigemptyset(sigset_t *set);

     int
     sigfillset(sigset_t *set);

     int
     sigaddset(sigset_t	*set, int signo);

     int
     sigdelset(sigset_t	*set, int signo);

     int
     sigismember(const sigset_t	*set, int signo);

DESCRIPTION
     These functions manipulate	signal sets stored in a	sigset_t.  Either
     sigemptyset() or sigfillset() must	be called for every object of type
     sigset_t before any other use of the object.

     The sigemptyset() function	initializes a signal set to be empty.

     The sigfillset() function initializes a signal set	to contain all sig-
     nals.

     The sigaddset() function adds the specified signal	signo to the signal
     set.

     The sigdelset() function deletes the specified signal signo from the sig-
     nal set.

     The sigismember() function	returns	whether	a specified signal signo is
     contained in the signal set.

RETURN VALUES
     The sigismember() function	returns	1 if the signal	is a member of the
     set, 0 otherwise.	The other functions return 0 upon success.  A -1
     return value indicates an error occurred and the global variable errno is
     set to indicate the reason.

ERRORS
     These functions could fail	if one of the following	occurs:

     [EINVAL]		signo has an invalid value.

SEE ALSO
     kill(2), sigaction(2), sigpending(2), sigprocmask(2), sigsuspend(2)

STANDARDS
     These functions are defined by IEEE Std 1003.1-1988 (``POSIX.1'').

FreeBSD	11.1		       December	16, 2004		  FreeBSD 11.1

NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | ERRORS | SEE ALSO | STANDARDS

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