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

NAME
     sigemptyset, sigfillset, sigaddset, sigandset, sigdelset, sigisemptyset,
     sigismember, sigorset -- 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
     sigandset(sigset_t	*set, const sigset_t *left, const sigset_t *right);

     int
     sigdelset(sigset_t	*set, int signo);

     int
     sigisemptyset(const sigset_t *set);

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

     int
     sigorset(sigset_t *set, const sigset_t *left, const sigset_t *right);

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 sigandset() function sets the specified set to	the logical AND	of all
     signals from the left and right signal sets.

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

     The sigisemptyset() function returns whether the specified	set is empty
     or	not.

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

     The sigorset() function sets the specified	set to the logical OR of all
     signals from the left and right signal sets.

RETURN VALUES
     The sigisemptyset() function returns 1 if the set is empty, 0 otherwise.

     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
     The sigandset(), sigisemptyset(), and sigorset() functions	are FreeBSD
     extensions, compatible with functions of the same name provided by	both
     musl libc and GNU libc.

     The rest of these functions are defined by	IEEE Std 1003.1-1988
     ("POSIX.1").

FreeBSD	13.0		       October 29, 2019			  FreeBSD 13.0
NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | ERRORS | SEE ALSO | STANDARDS

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