2faeeff4c9
Stop calling system calls "function calls". Use "The .Fn system call" a-la "The .Nm utility". When referring to a non-BSD implementation in the HISTORY section, call syscall a function, to be safe.
85 lines
3.0 KiB
Groff
85 lines
3.0 KiB
Groff
.\" 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.
|
|
.\"
|
|
.\" @(#)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
|
|
The
|
|
.Fn sigsuspend
|
|
system call
|
|
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
|
|
system call
|
|
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 sigsuspend
|
|
system call is expected to conform to
|
|
.St -p1003.1-90 .
|