BSD 4_4 release

[unix-history] / usr / src / lib / libc / sys / _exit.2

diff --git a/usr/src/lib/libc/sys/_exit.2 b/usr/src/lib/libc/sys/_exit.2
index 995fed6..73e6062 100644 (file)
--- a/usr/src/lib/libc/sys/_exit.2
+++ b/usr/src/lib/libc/sys/_exit.2
@@ -1,49 +1,112 @@
-.\" Copyright (c) 1980 Regents of the University of California.
-.\" All rights reserved.  The Berkeley software License Agreement
-.\" specifies the terms and conditions for redistribution.
+.\" Copyright (c) 1980, 1993
+.\"    The Regents of the University of California.  All rights reserved.

 .\"
 .\"

-.\"    @(#)_exit.2     6.3 (Berkeley) %G%
+.\" 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.

 .\"
 .\"

-.TH EXIT 2 ""
-.UC 4
-.SH NAME
-_exit \- terminate a process
-.SH SYNOPSIS
-.nf
-.ft B
-_exit(status)
-int status;
-.fi
-.SH DESCRIPTION
-.I _exit
+.\" 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
+.\"
+.Dd June 4, 1993
+.Dt EXIT 2
+.Os BSD 4
+.Sh NAME
+.Nm _exit
+.Nd terminate the calling process
+.Sh SYNOPSIS
+.Fd #include <unistd.h>
+.Ft void
+.Fn _exit "int status"
+.Sh DESCRIPTION
+The
+.Fn _exit
+function

 terminates a process with the following consequences:
 terminates a process with the following consequences:

-.in +5n
-.PP
+.Bl -bullet
+.It

 All of the descriptors open in the calling process are closed.
 All of the descriptors open in the calling process are closed.

-This may entail delays, for example waiting for output to drain;
+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.
 a process in this state may not be killed, as it is already dying.

-.PP
-If the parent process of the calling process is executing a
-.I wait
-or is interested in the SIGCHLD signal,
-then it is notified of the calling process's termination and
-the low-order eight bits of \fIstatus\fP are made available to it;
-see
-.IR wait (2).
-.PP
-The parent process ID of all of the calling process's existing child
-processes are also set to 1.  This means that the initialization process
-(see 
-.IR intro (2))
-inherits each of these processes as well.
-Any stopped children are restarted with a hangup signal (SIGHUP).
-.in -5n
-.PP
+.It
+If the parent process of the calling process has an outstanding
+.Xr wait
+call
+or catches the
+.Dv SIGCHLD
+signal,
+it is notified of the calling process's termination and
+the
+.Em 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
+(see the DEFINITIONS section of
+.Xr intro 2 )
+inherits each of these processes.
+.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
 Most C programs call the library routine

-.IR exit (3),
-which performs cleanup actions in the standard I/O library before
-calling \fI_exit\fP\|.
-.SH "RETURN VALUE"
-This call never returns.
-.SH "SEE ALSO"
-fork(2), sigvec(2), wait(2), exit(3)
+.Xr exit 3 ,
+which flushes buffers, closes streams, unlinks temporary files, etc.,
+before
+calling
+.Fn _exit .
+.Sh RETURN VALUE
+.Fn _exit
+can never return.
+.Sh SEE ALSO
+.Xr fork 2 ,
+.Xr sigvec 2 ,
+.Xr wait 2 ,
+.Xr exit 3
+.Sh STANDARDS
+The
+.Nm _exit
+function is defined by
+.St -p1003.1-88 .