sigsetops(3) BSD Library Functions Manual sigsetops(3)
NAME
sigaddset, sigdelset, sigemptyset, sigfillset, sigismember -- manipulate
signal sets
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <signal.h>
int
sigaddset(sigset_t *set, int signo);
int
sigdelset(sigset_t *set, int signo);
int
sigemptyset(sigset_t *set);
int
sigfillset(sigset_t *set);
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.
These functions are provided as macros in the include file <signal.h>.
Actual functions are available if their names are undefined (with #undef
name).
RETURN VALUES
The sigismember() function returns 1 if the signal is a member of the
set, 0 otherwise. The other functions return 0.
ERRORS
Currently, no errors are detected.
SEE ALSO
kill(2), sigaction(2), sigsuspend(2)
STANDARDS
These functions are defined by IEEE Std 1003.1-1988 (``POSIX.1'').
BSD June 4, 1993 BSD
Mac OS X 10.8 - Generated Fri Aug 31 05:27:28 CDT 2012