SIGSETOPS(3) OpenBSD 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. 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 number.
SEE ALSOkill(2), sigaction(2), sigpending(2), sigprocmask(2), sigsuspend(2)STANDARDS
These functions are defined by IEEE Std 1003.1-1990 (``POSIX'').
OpenBSD 4.9 May 31, 2007 OpenBSD 4.9