2fe8fb192f
There is important information about booting non-ack images in docs/UPDATING. ack/aout-format images can't be built any more, and booting clang/ELF-format ones is a little different. Updating to the new boot monitor is recommended. Changes in this commit: . drop boot monitor -> allowing dropping ack support . facility to copy ELF boot files to /boot so that old boot monitor can still boot fairly easily, see UPDATING . no more ack-format libraries -> single-case libraries . some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases . drop several ack toolchain commands, but not all support commands (e.g. aal is gone but acksize is not yet). . a few libc files moved to netbsd libc dir . new /bin/date as minix date used code in libc/ . test compile fix . harmonize includes . /usr/lib is no longer special: without ack, /usr/lib plays no kind of special bootstrapping role any more and bootstrapping is done exclusively through packages, so releases depend even less on the state of the machine making them now. . rename nbsd_lib* to lib* . reduce mtree
105 lines
3.7 KiB
Groff
105 lines
3.7 KiB
Groff
.\" $NetBSD: siginterrupt.3,v 1.11 2003/08/07 16:42:56 agc Exp $
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.\"
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.\" Copyright (c) 1985, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)siginterrupt.3 8.1 (Berkeley) 6/4/93
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.\"
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.Dd June 4, 1993
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.Dt SIGINTERRUPT 3
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.Os
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.Sh NAME
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.Nm siginterrupt
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.Nd allow signals to interrupt system calls
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In signal.h
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.Ft int
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.Fn siginterrupt "int sig" "int flag"
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.Sh DESCRIPTION
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The
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.Fn siginterrupt
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function
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is used to change the system call restart
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behavior when a system call is interrupted by the specified signal.
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If the flag is false (0), then system calls will be restarted if
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they are interrupted by the specified signal
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and no data has been transferred yet.
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System call restart is the default behavior on
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.Bx 4.2 .
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.Pp
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If the flag is true (1),
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then restarting of system calls is disabled.
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If a system call is interrupted by the specified signal
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and no data has been transferred,
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the system call will return \-1 with the global variable
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.Va errno
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set to
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.Dv EINTR .
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Interrupted system calls that have started transferring
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data will return the amount of data actually transferred.
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System call interrupt is the signal behavior found on
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.Bx 4.1
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and
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.At V
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systems.
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.Pp
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Note that the new
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.Bx 4.2
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signal handling semantics are not
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altered in any other way.
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Most notably, signal handlers always remain installed until
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explicitly changed by a subsequent
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.Xr sigaction 2
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call, and the signal mask operates as documented in
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.Xr sigaction 2 .
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Programs may switch between restartable and interruptible
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system call operation as often as desired in the execution of a program.
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.Pp
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Issuing a
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.Fn siginterrupt 3
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call during the execution of a signal handler will cause
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the new action to take place on the next signal to be caught.
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.Sh NOTES
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This library routine uses an extension of the
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.Xr sigaction 2
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system call that is not available in
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.Bx 4.2 ,
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hence it should not be used if backward compatibility is needed.
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.Sh RETURN VALUES
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A 0 value indicates that the call succeeded.
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A \-1 value indicates that an invalid signal number has been supplied.
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.Sh SEE ALSO
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.Xr sigaction 2 ,
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.Xr sigprocmask 2 ,
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.Xr sigsuspend 2
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.Sh HISTORY
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The
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.Fn siginterrupt
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function appeared in
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.Bx 4.3 .
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