SIGSETOPS (3)
POSIX
signal set operations.
SYNOPSIS
#include <signal.h>
int sigemptyset(sigset_t * set );
int sigfillset(sigset_t * set );
int sigaddset(sigset_t * set , int signum );
int sigdelset(sigset_t * set , int signum );
int sigismember(const sigset_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.
RETURN VALUES
sigemptyset , sigfullset , 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.
CONFORMING TO
SEE ALSO
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