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-'\" t
-.\" Copyright (c) 1994 Mike Battersby
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.\" Modified by aeb, 960721
-.\" 2005-11-21, mtk, added descriptions of sigisemptyset(), sigandset(),
-.\"                  and sigorset()
-.\" 2007-10-26 mdw   added wording that a sigset_t must be initialized
-.\"                  prior to use
-.\"
-.TH SIGSETOPS 3 (date) "Linux man-pages (unreleased)"
-.SH NAME
-sigemptyset, sigfillset, sigaddset, sigdelset, sigismember \- POSIX
-signal set operations
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <signal.h>
-.PP
-.BI "int sigemptyset(sigset_t *" set );
-.BI "int sigfillset(sigset_t *" set );
-.PP
-.BI "int sigaddset(sigset_t *" set ", int " signum );
-.BI "int sigdelset(sigset_t *" set ", int " signum );
-.PP
-.BI "int sigismember(const sigset_t *" set ", int " signum );
-.fi
-.PP
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.PP
-.BR sigemptyset (),
-.BR sigfillset (),
-.BR sigaddset (),
-.BR sigdelset (),
-.BR sigismember ():
-.nf
-    _POSIX_C_SOURCE
-.fi
-.SH DESCRIPTION
-These functions allow the manipulation of POSIX signal sets.
-.PP
-.BR sigemptyset ()
-initializes the signal set given by
-.I set
-to empty, with all signals excluded from the set.
-.PP
-.BR sigfillset ()
-initializes
-.I set
-to full, including all signals.
-.PP
-.BR sigaddset ()
-and
-.BR sigdelset ()
-add and delete respectively signal
-.I signum
-from
-.IR set .
-.PP
-.BR sigismember ()
-tests whether
-.I signum
-is a member of
-.IR set .
-.PP
-Objects of type
-.I sigset_t
-must be initialized by a call to either
-.BR sigemptyset ()
-or
-.BR sigfillset ()
-before being passed to the functions
-.BR sigaddset (),
-.BR sigdelset (),
-and
-.BR sigismember ()
-or the additional glibc functions described below
-.RB ( sigisemptyset (),
-.BR sigandset (),
-and
-.BR sigorset ()).
-The results are undefined if this is not done.
-.SH RETURN VALUE
-.BR sigemptyset (),
-.BR sigfillset (),
-.BR sigaddset (),
-and
-.BR sigdelset ()
-return 0 on success and \-1 on error.
-.PP
-.BR sigismember ()
-returns 1 if
-.I signum
-is a member of
-.IR set ,
-0 if
-.I signum
-is not a member, and \-1 on error.
-.PP
-On error, these functions set
-.I errno
-to indicate the error.
-.SH ERRORS
-.TP
-.B EINVAL
-.I signum
-is not a valid signal.
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.ad l
-.nh
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface	Attribute	Value
-T{
-.BR sigemptyset (),
-.BR sigfillset (),
-.BR sigaddset (),
-.BR sigdelset (),
-.BR sigismember (),
-.BR sigisemptyset (),
-.BR sigorset (),
-.BR sigandset ()
-T}	Thread safety	MT-Safe
-.TE
-.hy
-.ad
-.sp 1
-.SH VERSIONS
-.SS GNU
-If the
-.B _GNU_SOURCE
-feature test macro is defined, then \fI<signal.h>\fP
-exposes three other functions for manipulating signal
-sets:
-.PP
-.nf
-.BI "int sigisemptyset(const sigset_t *" set );
-.BI "int sigorset(sigset_t *" dest ", const sigset_t *" left ,
-.BI "              const sigset_t *" right );
-.BI "int sigandset(sigset_t *" dest ", const sigset_t *" left ,
-.BI "              const sigset_t *" right );
-.fi
-.PP
-.BR sigisemptyset ()
-returns 1 if
-.I set
-contains no signals, and 0 otherwise.
-.PP
-.BR sigorset ()
-places the union of the sets
-.I left
-and
-.I right
-in
-.IR dest .
-.BR sigandset ()
-places the intersection of the sets
-.I left
-and
-.I right
-in
-.IR dest .
-Both functions return 0 on success, and \-1 on failure.
-.PP
-These functions are nonstandard (a few other systems provide similar
-functions) and their use should be avoided in portable applications.
-.SH STANDARDS
-POSIX.1-2008.
-.SH HISTORY
-POSIX.1-2001.
-.SH NOTES
-When creating a filled signal set, the glibc
-.BR sigfillset ()
-function does not include the two real-time signals used internally
-by the NPTL threading implementation.
-See
-.BR nptl (7)
-for details.
-.SH SEE ALSO
-.BR sigaction (2),
-.BR sigpending (2),
-.BR sigprocmask (2),
-.BR sigsuspend (2)