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SIGADDSET(3)	       FreeBSD Library Functions Manual		  SIGADDSET(3)

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

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.  sigemptyset() and
     sigfillset() are provided as macros, but actual functions are available
     if	their names are	undefined (with	#undef name).

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

     sigfillset() initializes a	signal set to contain all signals.

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

     sigdelset() deletes the specified signal signo from the signal set.

     sigismember() 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
     and 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 may fail if one of	the following occurs:

     [EINVAL]		The specified signal signo is not a valid signal num-
			ber.

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

STANDARDS
     These functions are defined by ISO/IEC 9945-1:1990	("POSIX.1").

FreeBSD	13.0			 May 29, 2017			  FreeBSD 13.0

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

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