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+.\" Copyright (c) 1994 Mike Battersby
+.\"
+.\" Permission is granted to make and distribute verbatim copies of this
+.\" manual provided the copyright notice and this permission notice are
+.\" preserved on all copies.
+.\"
+.\" Permission is granted to copy and distribute modified versions of this
+.\" manual under the conditions for verbatim copying, provided that the
+.\" entire resulting derived work is distributed under the terms of a
+.\" permission notice identical to this one.
+.\" 
+.\" Since the Linux kernel and libraries are constantly changing, this
+.\" manual page may be incorrect or out-of-date.  The author(s) assume no
+.\" responsibility for errors or omissions, or for damages resulting from
+.\" the use of the information contained herein.  The author(s) may not
+.\" have taken the same level of care in the production of this manual,
+.\" which is licensed free of charge, as they might when working
+.\" professionally.
+.\" 
+.\" Formatted or processed versions of this manual, if unaccompanied by
+.\" the source, must acknowledge the copyright and authors of this work.
+.\"
+.\" Modified by aeb, 960721
+.\"
+.TH SIGSETOPS 3 1994-09-24 "Linux 1.0" "Linux Programmer's Manual"
+
+.SH NAME
+sigemptyset, sigfillset, sigaddset, sigdelset, sigismember \- POSIX
+signal set operations.
+
+.SH SYNOPSIS
+.B #include <signal.h>
+.sp 2
+.BI "int sigemptyset(sigset_t *" set );
+.sp
+.BI "int sigfillset(sigset_t *" set );
+.sp
+.BI "int sigaddset(sigset_t *" set ", int " signum );
+.sp
+.BI "int sigdelset(sigset_t *" set ", int " signum );
+.sp
+.BI "int sigismember(const sigset_t *" set ", int " signum );
+
+.SH DESCRIPTION
+The
+.BR sigsetops (3)
+functions allow the manipulation of POSIX signal sets.
+.PP
+.B sigemptyset
+initializes the signal set given by
+.I set
+to empty, with all signals excluded from the set.
+.PP
+.B sigfillset
+initializes 
+.I set
+to full, including all signals.
+.PP
+.B sigaddset 
+and
+.B sigdelset
+add and delete respectively signal
+.I signum
+from 
+.IR set .
+.PP
+.B sigismember
+tests whether
+.I signum
+is a member of 
+.I set.
+.SH "RETURN VALUE"
+.BR sigemptyset ", " sigfillset ", " sigaddset
+and
+.B sigdelset 
+return 0 on success and \-1 on error.
+.PP
+.B sigismember
+returns 1 if
+.I signum
+is a member of
+.IR set ,
+0 if
+.I signum
+is not a member, and \-1 on error.
+.SH ERRORS
+.TP
+.B EINVAL
+.I sig
+is not a valid signal.
+.SH "CONFORMING TO"
+POSIX
+.SH "SEE ALSO"
+.BR sigaction (2),
+.BR sigpending (2),
+.BR sigprocmask (2),
+.BR sigsuspend (2)