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.\"     @(#)exit.3	8.1 (Berkeley) 6/4/93
.\" $FreeBSD: src/lib/libc/stdlib/exit.3,v 1.6.2.4 2001/12/14 18:33:58 ru Exp $
.\" $DragonFly: src/lib/libc/stdlib/exit.3,v 1.3 2007/06/15 19:36:33 swildner Exp $
.\"
.Dd June 15, 2007
.Dt EXIT 3
.Os
.Sh NAME
.Nm exit ,
.Nm _Exit
.Nd perform normal program termination
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In stdlib.h
.Ft void
.Fn exit "int status"
.Ft void
.Fn _Exit "int status"
.Sh DESCRIPTION
The
.Fn exit
and
.Fn _Exit
functions terminate a process.
.Pp
Before termination,
.Fn exit
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
The C99 function
.Fn _Exit
terminates without calling the functions registered with
.Xr atexit 3
by just calling
.Xr _exit 2 .
Code intended to be portable should always use
.Xr _exit 2
directly as it is defined by
.St -susv2
as well.
.Pp
Passing arbitrary values back to the environment as
.Ar status
is considered bad style;
you should use the values
.Dv EXIT_SUCCESS
and
.Dv EXIT_FAILURE .
If portability is not a concern, you may
use the values described in
.Xr sysexits 3 .
.Sh RETURN VALUES
The
.Fn exit
and
.Fn _Exit
functions never return.
.Sh SEE ALSO
.Xr _exit 2 ,
.Xr atexit 3 ,
.Xr intro 3 ,
.Xr sysexits 3 ,
.Xr tmpfile 3
.Sh STANDARDS
The
.Fn exit
and
.Fn _Exit
functions conform to
.St -isoC-99 .