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.\"	$OpenBSD: exit.3,v 1.15 2013/07/17 05:42:11 schwarze Exp $
.\"
.Dd $Mdocdate: July 17 2013 $
.Dt EXIT 3
.Os
.Sh NAME
.Nm exit
.Nd perform normal program termination
.Sh SYNOPSIS
.In stdlib.h
.Ft void
.Fn exit "int status"
.Sh DESCRIPTION
The
.Fn exit
function terminates a process.
.Pp
Before termination it performs the following functions in the
order listed:
.Bl -enum -offset indent
.It
Call the functions registered with the
.Xr atexit 3
function, in the reverse order of their registration.
.It
Flush all open output streams.
.It
Close all open streams.
.It
Unlink all files created with the
.Xr tmpfile 3
function.
.El
.Pp
Following this,
.Fn exit
calls
.Xr _exit 2 .
Note that typically
.Xr _exit 2
only passes the lower 8 bits of
.Fa status
on to the parent, thus negative values have less meaning.
.Sh RETURN VALUES
The
.Fn exit
function never returns.
.Sh SEE ALSO
.Xr _exit 2 ,
.Xr atexit 3 ,
.Xr intro 3 ,
.Xr sysexits 3 ,
.Xr tmpfile 3
.Sh STANDARDS
The
.Fn exit
function conforms to
.St -ansiC-99 .
.Sh HISTORY
An
.Fn exit
function first appeared as a system call in
.At v1 .
It has accepted the
.Fa status
argument since
.At v2 .
In
.At v7 ,
the bare system call was renamed to
.Xr _exit 2 .