sigsetops(3)sigsetops(3)Name
sigemptyset, sigfillset, sigaddset, sigdelset, sigismember - manipulate
signal sets (POSIX)
Syntax
#include <signal.h>
int sigemptyset(set)
sigset_t *set;
int sigfillset (set)
sigset_t *set;
int sigaddset(set,sig)
sigset_t *set;
int sig;
int sigdelset(set,sig)
sigset_t *set;
int sig;
int sigismember(set,sig)
sigset_t *set;
int sig;
Description
The functions manipulate signal sets used by the other POSIX signal
functions
The function initializes the signal set pointed to by the argument set
so that all signals are excluded.
The function initializes the signal set pointed to by the argument set
so that all signals are included.
The and functions respectively add and delete the individual signal
specified by the value of the argument sig from the signal set pointed
to by the argument set.
The function tests whether the signal specified by the value of the
argument sig is a member of the set pointed to by the argument set.
Return Values
Upon successful completion, the function returns a value of 1 if the
specified signal is a member of the set. If it is not a member of the
set, a value of 0 is returned.
If the or functions fail a -1 value is returned and errno is set to
indicate the reason.
Diagnostics
The function will fail and the signal mask will remain unchanged if one
of the following occur:
[EINVAL] The value of the sig argument is not a valid signal num‐
ber
See Alsosigprocmask(3), sigaction(3), sigsuspend(3), sigpending(2)sigsetops(3)