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@(#)sigsetops.3 8.1 (Berkeley) 6/4/93
.Dd June 4, 1993 .Dt SIGSETOPS 3 .Os .Sh NAME .Nm sigemptyset , .Nm sigfillset , .Nm sigaddset , .Nm sigdelset , .Nm sigismember .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 sigdelset "sigset_t *set" "int signo" .Ft int .Fn sigismember "sigset_t *set" "int signo" .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 sigdelset function deletes the specified signal .Fa signo from the signal set.
p The .Fn sigismember function returns whether a specified signal .Fa signo is contained in the signal set.
p .Fn sigemptyset and .Fn sigfillset are provided as macros, but actual functions are available if their names are undefined (with #undef .Em name ) . .Sh RETURN VALUES The .Fn sigismember function returns 1 if the signal is a member of the set, a 0 otherwise. 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 sigsuspend 2 , .Xr signal 7 .Sh STANDARDS These functions conform to .St -p1003.1-90 .