SIGSETOPS(3) BSD Programmer's Manual SIGSETOPS(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.
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 ALSOkill(2), sigaction(2), sigsuspend(2)STANDARDS
These functions are defined by IEEE Std1003.1-1988 (``POSIX'').
BSDI BSD/OS June 4, 1993 1
