86 lines
2.7 KiB
Groff
86 lines
2.7 KiB
Groff
|
.\" Copyright (C) 2000 Jason Evans <jasone@canonware.com>.
|
||
|
|
.\" 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(s), this list of conditions and the following disclaimer as
|
||
|
|
.\" the first lines of this file unmodified other than the possible
|
||
|
|
.\" addition of one or more copyright notices.
|
||
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
||
|
|
.\" notice(s), this list of conditions and the following disclaimer in
|
||
|
|
.\" the documentation and/or other materials provided with the
|
||
|
|
.\" distribution.
|
||
|
|
.\"
|
||
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``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 COPYRIGHT HOLDER(S) 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.
|
||
|
|
.\"
|
||
|
|
.\" $FreeBSD$
|
||
|
|
.Dd April 27, 2000
|
||
|
|
.Dt SIGWAIT 3
|
||
|
|
.Os
|
||
|
|
.Sh NAME
|
||
|
|
.Nm sigwait
|
||
|
|
.Nd select a set of signals
|
||
|
|
.Sh LIBRARY
|
||
|
|
.Lb libc_r
|
||
|
|
.Sh SYNOPSIS
|
||
|
|
.Fd #include <signal.h>
|
||
|
|
.Ft int
|
||
|
|
.Fn sigwait "const sigset_t *set" "int *sig"
|
||
|
|
.Sh DESCRIPTION
|
||
|
|
The
|
||
|
|
.Fn sigwait
|
||
|
|
function selects a set of signals, specified by
|
||
|
|
.Fa set .
|
||
|
|
If none of the selected signals are pending,
|
||
|
|
.Fn sigwait
|
||
|
|
waits until one or more of the selected signals has been generated.
|
||
|
|
Then
|
||
|
|
.Fn sigwait
|
||
|
|
atomically clears one of the selected signals from the set of pending signals
|
||
|
|
for the process and sets the location pointed to by
|
||
|
|
.Fa sig
|
||
|
|
to the signal number that was cleared.
|
||
|
|
.Pp
|
||
|
|
The signals specified by
|
||
|
|
.Fa set
|
||
|
|
should be blocked at the time of the call to
|
||
|
|
.Fn sigwait .
|
||
|
|
.Sh RETURN VALUES
|
||
|
|
If successful,
|
||
|
|
.Fn sigwait
|
||
|
|
returns 0 and sets the location pointed to by
|
||
|
|
.Fa sig
|
||
|
|
to the cleared signal number.
|
||
|
|
Otherwise, an error number is returned.
|
||
|
|
.Sh ERRORS
|
||
|
|
.Fn sigwait
|
||
|
|
will fail if:
|
||
|
|
.Bl -tag -width Er
|
||
|
|
.It Bq Er EINVAL
|
||
|
|
.Fa set
|
||
|
|
specifies one or more invalid signal numbers.
|
||
|
|
.El
|
||
|
|
.Sh SEE ALSO
|
||
|
|
.Xr pause 3 ,
|
||
|
|
.Xr pthread_sigmask 3 ,
|
||
|
|
.Xr sigaction 2 ,
|
||
|
|
.Xr sigpending 2 ,
|
||
|
|
.Xr sigsuspend 2
|
||
|
|
.Sh STANDARDS
|
||
|
|
.Fn sigwait
|
||
|
|
conforms to ISO/IEC 9945-1 ANSI/IEEE
|
||
|
|
.Pq Dq Tn POSIX
|
||
|
|
Std 1003.1 1996 Edition.
|