mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-23 11:18:54 +00:00
128 lines
3.8 KiB
Groff
128 lines
3.8 KiB
Groff
.\" Copyright (c) 1980, 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.
|
|
.\"
|
|
.\" @(#)_exit.2 8.1 (Berkeley) 6/4/93
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd June 4, 1993
|
|
.Dt EXIT 2
|
|
.Os
|
|
.Sh NAME
|
|
.Nm _exit
|
|
.Nd terminate the calling process
|
|
.Sh LIBRARY
|
|
.Lb libc
|
|
.Sh SYNOPSIS
|
|
.In unistd.h
|
|
.Ft void
|
|
.Fn _exit "int status"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Fn _exit
|
|
system call
|
|
terminates a process with the following consequences:
|
|
.Bl -bullet
|
|
.It
|
|
All of the descriptors open in the calling process are closed.
|
|
This may entail delays, for example, waiting for output to drain;
|
|
a process in this state may not be killed, as it is already dying.
|
|
.It
|
|
If the parent process of the calling process has an outstanding
|
|
.Xr wait 2
|
|
call
|
|
or catches the
|
|
.Dv SIGCHLD
|
|
signal,
|
|
it is notified of the calling process's termination and
|
|
the
|
|
.Fa status
|
|
is set as defined by
|
|
.Xr wait 2 .
|
|
.It
|
|
The parent process-ID of all of the calling process's existing child
|
|
processes are set to 1; the initialization process
|
|
inherits each of these processes
|
|
(see
|
|
.Xr init 8
|
|
and the
|
|
.Sx DEFINITIONS
|
|
section of
|
|
.Xr intro 2 ) .
|
|
.It
|
|
If the termination of the process causes any process group
|
|
to become orphaned (usually because the parents of all members
|
|
of the group have now exited; see
|
|
.Dq orphaned process group
|
|
in
|
|
.Xr intro 2 ) ,
|
|
and if any member of the orphaned group is stopped,
|
|
the
|
|
.Dv SIGHUP
|
|
signal and the
|
|
.Dv SIGCONT
|
|
signal are sent to all members of the newly-orphaned process group.
|
|
.It
|
|
If the process is a controlling process (see
|
|
.Xr intro 2 ) ,
|
|
the
|
|
.Dv SIGHUP
|
|
signal is sent to the foreground process group of the controlling terminal,
|
|
and all current access to the controlling terminal is revoked.
|
|
.El
|
|
.Pp
|
|
Most C programs call the library routine
|
|
.Xr exit 3 ,
|
|
which flushes buffers, closes streams, unlinks temporary files, etc.,
|
|
before
|
|
calling
|
|
.Fn _exit .
|
|
.Sh RETURN VALUES
|
|
The
|
|
.Fn _exit
|
|
system call
|
|
can never return.
|
|
.Sh SEE ALSO
|
|
.Xr fork 2 ,
|
|
.Xr sigaction 2 ,
|
|
.Xr wait 2 ,
|
|
.Xr exit 3 ,
|
|
.Xr init 8
|
|
.Sh STANDARDS
|
|
The
|
|
.Fn _exit
|
|
system call is expected to conform to
|
|
.St -p1003.1-90 .
|
|
.Sh HISTORY
|
|
The
|
|
.Fn _exit
|
|
function appeared in
|
|
.At v7 .
|