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@(#)sigsetops.3 8.1 (Berkeley) 6/4/93
$FreeBSD: stable/11/lib/libc/gen/sigsetops.3 355898 2019-12-19 02:09:16Z kevans $
.Dd October 29, 2019 .Dt SIGSETOPS 3 .Os .Sh NAME .Nm sigemptyset , .Nm sigfillset , .Nm sigaddset , .Nm sigandset , .Nm sigdelset , .Nm sigisemptyset , .Nm sigismember , .Nm sigorset .Nd manipulate signal sets .Sh LIBRARY .Lb libc .Sh SYNOPSIS n signal.h .Ft int .Fn sigemptyset "sigset_t *set" .Ft int .Fn sigfillset "sigset_t *set" .Ft int .Fn sigaddset "sigset_t *set" "int signo" .Ft int .Fn sigandset "sigset_t *set" "const sigset_t *left" "const sigset_t *right" .Ft int .Fn sigdelset "sigset_t *set" "int signo" .Ft int .Fn sigisemptyset "const sigset_t *set" .Ft int .Fn sigismember "const sigset_t *set" "int signo" .Ft int .Fn sigorset "sigset_t *set" "const sigset_t *left" "const sigset_t *right" .Sh DESCRIPTION These functions manipulate signal sets stored in a .Fa sigset_t . Either .Fn sigemptyset or .Fn sigfillset must be called for every object of type .Fa sigset_t before any other use of the object.
p The .Fn sigemptyset function initializes a signal set to be empty.
p The .Fn sigfillset function initializes a signal set to contain all signals.
p The .Fn sigaddset function adds the specified signal .Fa signo to the signal set.
p The .Fn sigandset function sets the specified .Fa set to the logical AND of all signals from the .Fa left and .Fa right signal sets.
p The .Fn sigdelset function deletes the specified signal .Fa signo from the signal set.
p The .Fn sigisemptyset function returns whether the specified .Fa set is empty or not.
p The .Fn sigismember function returns whether a specified signal .Fa signo is contained in the signal set.
p The .Fn sigorset function sets the specified .Fa set to the logical OR of all signals from the .Fa left and .Fa right signal sets. .Sh RETURN VALUES The .Fn sigisemptyset function returns 1 if the set is empty, 0 otherwise.
p The .Fn sigismember function returns 1 if the signal is a member of the set, 0 otherwise.
p The other functions return 0 upon success. A -1 return value indicates an error occurred and the global variable .Va errno is set to indicate the reason. .Sh ERRORS These functions could fail if one of the following occurs: l -tag -width Er t Bq Er EINVAL .Fa signo has an invalid value. .El .Sh SEE ALSO .Xr kill 2 , .Xr sigaction 2 , .Xr sigpending 2 , .Xr sigprocmask 2 , .Xr sigsuspend 2 .Sh STANDARDS The .Fn sigandset , .Fn sigisemptyset , and .Fn sigorset functions are FreeBSD extensions, compatible with functions of the same name provided by both musl libc and GNU libc.
p The rest of these functions are defined by .St -p1003.1-88 .