freebsd-nq/lib/libc/sys/sigsuspend.2

.\" Copyright (c) 1983, 1991, 1993
.\"	The Regents of the University of California.  All rights reserved.
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.\"	This product includes software developed by the University of
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.\"    without specific prior written permission.
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\"	@(#)sigsuspend.2	8.2 (Berkeley) 5/16/95
.\" $FreeBSD$
.\"
.Dd May 16, 1995
.Dt SIGSUSPEND 2
.Os
.Sh NAME
.Nm sigsuspend
.Nd atomically release blocked signals and wait for interrupt
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In signal.h
.Ft int
.Fn sigsuspend "const sigset_t *sigmask"
.Sh DESCRIPTION
.Fn Sigsuspend
temporarily changes the blocked signal mask to the set to which
.Fa sigmask
points,
and then waits for a signal to arrive;
on return the previous set of masked signals is restored.
The signal mask set
is usually empty to indicate that all
signals are to be unblocked for the duration of the call.
.Pp
In normal usage, a signal is blocked using
.Xr sigprocmask 2
to begin a critical section, variables modified on the occurrence
of the signal are examined to determine that there is no work
to be done, and the process pauses awaiting work by using
.Fn sigsuspend
with the previous mask returned by
.Xr sigprocmask .
.Sh RETURN VALUES
The
.Fn sigsuspend
function
always terminates by being interrupted, returning -1 with
.Va errno
set to
.Er EINTR .
.Sh SEE ALSO
.Xr sigaction 2 ,
.Xr sigprocmask 2 ,
.Xr sigsetops 3
.Sh STANDARDS
The
.Fn sigsupend
function call is expected to conform to
.St -p1003.1-90 .
BSD 4.4 Lite Lib Sources 1994-05-27 05:00:24 +00:00			`.\" Copyright (c) 1983, 1991, 1993`
			`.\" The Regents of the University of California. All rights reserved.`
			`.\"`
			`.\" Redistribution and use in source and binary forms, with or without`
			`.\" modification, are permitted provided that the following conditions`
			`.\" are met:`
			`.\" 1. Redistributions of source code must retain the above copyright`
			`.\" notice, this list of conditions and the following disclaimer.`
			`.\" 2. Redistributions in binary form must reproduce the above copyright`
			`.\" notice, this list of conditions and the following disclaimer in the`
			`.\" documentation and/or other materials provided with the distribution.`
			`.\" 3. All advertising materials mentioning features or use of this software`
			`.\" must display the following acknowledgement:`
			`.\" This product includes software developed by the University of`
			`.\" California, Berkeley and its contributors.`
			`.\" 4. Neither the name of the University nor the names of its contributors`
			`.\" may be used to endorse or promote products derived from this software`
			`.\" without specific prior written permission.`
			`.\"`
			.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
			`.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE`
			`.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE`
			`.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE`
			`.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL`
			`.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS`
			`.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)`
			`.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT`
			`.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY`
			`.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF`
			`.\" SUCH DAMAGE.`
			`.\"`
Merge from Lite2 onto mainline - - add undelete() and undelete.2 (requires libc minor bump some time) - man page updates 1997-03-11 11:35:56 +00:00			`.\" @(#)sigsuspend.2 8.2 (Berkeley) 5/16/95`
$Id$ -> $FreeBSD$ 1999-08-28 00:22:10 +00:00			`.\" $FreeBSD$`
BSD 4.4 Lite Lib Sources 1994-05-27 05:00:24 +00:00			`.\"`
Merge from Lite2 onto mainline - - add undelete() and undelete.2 (requires libc minor bump some time) - man page updates 1997-03-11 11:35:56 +00:00			`.Dd May 16, 1995`
BSD 4.4 Lite Lib Sources 1994-05-27 05:00:24 +00:00			`.Dt SIGSUSPEND 2`
			`.Os`
			`.Sh NAME`
			`.Nm sigsuspend`
			`.Nd atomically release blocked signals and wait for interrupt`
Introduce ".Lb" macro to libc manpages. More libraries manpages updates following. 2000-04-21 09:42:15 +00:00			`.Sh LIBRARY`
			`.Lb libc`
BSD 4.4 Lite Lib Sources 1994-05-27 05:00:24 +00:00			`.Sh SYNOPSIS`
mdoc(7) police: Use the new .In macro for #include statements. 2001-10-01 16:09:29 +00:00			`.In signal.h`
BSD 4.4 Lite Lib Sources 1994-05-27 05:00:24 +00:00			`.Ft int`
			`.Fn sigsuspend "const sigset_t *sigmask"`
			`.Sh DESCRIPTION`
			`.Fn Sigsuspend`
			`temporarily changes the blocked signal mask to the set to which`
			`.Fa sigmask`
			`points,`
			`and then waits for a signal to arrive;`
			`on return the previous set of masked signals is restored.`
			`The signal mask set`
			`is usually empty to indicate that all`
			`signals are to be unblocked for the duration of the call.`
			`.Pp`
			`In normal usage, a signal is blocked using`
			`.Xr sigprocmask 2`
			`to begin a critical section, variables modified on the occurrence`
			`of the signal are examined to determine that there is no work`
			`to be done, and the process pauses awaiting work by using`
			`.Fn sigsuspend`
			`with the previous mask returned by`
			`.Xr sigprocmask .`
			`.Sh RETURN VALUES`
			`The`
			`.Fn sigsuspend`
			`function`
			`always terminates by being interrupted, returning -1 with`
			`.Va errno`
			`set to`
mdoc(7) police: Er macro usage cleanup. 2000-11-22 16:02:00 +00:00			`.Er EINTR .`
BSD 4.4 Lite Lib Sources 1994-05-27 05:00:24 +00:00			`.Sh SEE ALSO`
			`.Xr sigaction 2 ,`
Sort cross references. 1997-01-20 23:23:22 +00:00			`.Xr sigprocmask 2 ,`
BSD 4.4 Lite Lib Sources 1994-05-27 05:00:24 +00:00			`.Xr sigsetops 3`
			`.Sh STANDARDS`
			`The`
Correctly use .Fn instead of .Nm to reference function names in a bunch of man pages. Use the correct .Bx (BSD UNIX) or .At (AT&T UNIX) macros instead of explicitly specifying the version in the text in a bunch of man pages. 1996-08-22 23:31:07 +00:00			`.Fn sigsupend`
Remove whitespace at EOL. 2001-07-15 07:53:42 +00:00			`function call is expected to conform to`
upgrade STANDARDS from POSIX 1003.1-88 to 1003.1-90 using .St macro use ``is expected to conform to'' phrase, not ``conforms to'' Pointed out by: Bruce->NIST-PCTS 1996-12-02 20:03:58 +00:00			`.St -p1003.1-90 .`