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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
In 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.
Pp
The
Fn sigemptyset
function initializes a signal set to be empty.
Pp
The
Fn sigfillset
function initializes a signal set to contain all signals.
Pp
The
Fn sigaddset
function adds the specified signal
Fa signo
to the signal set.
Pp
The
Fn sigdelset
function deletes the specified signal
Fa signo
from the signal set.
Pp
The
Fn sigismember
function returns whether a specified signal
Fa signo
is contained in the signal set.
Pp
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:
Bl -tag -width Er
It 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 .
