+++ /dev/null
-.\" Copyright (c) 1985, 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.
-.\" 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.
-.\"
-.\" @(#)siginterrupt.3 8.1 (Berkeley) 6/4/93
-.\" $FreeBSD: src/lib/libc/gen/siginterrupt.3,v 1.15 2007/01/09 00:27:55 imp Exp $
-.\"
-.Dd June 4, 1993
-.Dt SIGINTERRUPT 3
-.Os
-.Sh NAME
-.Nm siginterrupt
-.Nd allow signals to interrupt system calls
-.Sh LIBRARY
-.Lb libc
-.Sh SYNOPSIS
-.In signal.h
-.Ft int
-.Fn siginterrupt "int sig" "int flag"
-.Sh DESCRIPTION
-The
-.Fn siginterrupt
-function
-is used to change the system call restart
-behavior when a system call is interrupted by the specified signal.
-If the flag is false (0), then system calls will be restarted if
-they are interrupted by the specified signal
-and no data has been transferred yet.
-System call restart has been the default behavior since
-.Bx 4.2 ,
-and is the default behaviour for
-.Xr signal 3
-on
-.Fx .
-.Pp
-If the flag is true (1),
-then restarting of system calls is disabled.
-If a system call is interrupted by the specified signal
-and no data has been transferred,
-the system call will return \-1 with the global variable
-.Va errno
-set to
-.Er EINTR .
-Interrupted system calls that have started transferring
-data will return the amount of data actually transferred.
-System call interrupt is the signal behavior found on
-.Bx 4.1
-and
-.At V
-systems.
-.Pp
-Note that the new
-.Bx 4.2
-signal handling semantics are not
-altered in any other way.
-Most notably, signal handlers always remain installed until
-explicitly changed by a subsequent
-.Xr sigaction 2
-call, and the signal mask operates as documented in
-.Xr sigaction 2 .
-Programs may switch between restartable and interruptible
-system call operation as often as desired in the execution of a program.
-.Pp
-Issuing a
-.Fn siginterrupt 3
-call during the execution of a signal handler will cause
-the new action to take place on the next signal to be caught.
-.Sh NOTES
-This library routine uses an extension of the
-.Xr sigaction 2
-system call that is not available in
-.Bx 4.2 ;
-hence, it should not be used if backward compatibility is needed.
-.Sh RETURN VALUES
-.Rv -std siginterrupt
-.Sh ERRORS
-The
-.Fn siginterrupt
-call fails if:
-.Bl -tag -width Er
-.It Bq Er EINVAL
-The
-.Fa sig
-argument
-is not a valid signal number.
-.El
-.Sh SEE ALSO
-.Xr sigaction 2 ,
-.Xr sigblock 2 ,
-.Xr sigpause 2 ,
-.Xr sigsetmask 2 ,
-.Xr signal 3
-.Sh HISTORY
-The
-.Fn siginterrupt
-function appeared in
-.Bx 4.3 .
projects / apple / libc.git / blobdiff