gno/usr.man/man3/exit.3

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.\"     @(#)exit.3	8.1 (Berkeley) 6/4/93
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.TH EXIT 3 "22 January 1997" GNO "Library Routines"
.SH NAME
.BR exit ,
.BR _exit ,
.BR rexit
\- perform normal program termination
.SH SYNOPSIS
#include <stdlib.h>
.sp 1
void
\fBexit\fR (int \fIstatus\fR);
.br
void
\fBrexit\fR (int \fIstatus\fR);
.sp 1
#include <unistd.h>
.sp 1
void
\fB_exit\fR (int \fIstatus\fR);
.SH DESCRIPTION
.BR exit 
terminates a process.
.LP
Before termination
.BR exit
performs the following functions in the order listed:
.RS
.sp 1
Call the functions registered with the
.BR atexit (3)
function, in the reverse order of their registration.
.sp 1
Flush all open output streams.
.sp 1
Close all open streams.
.sp 1
Unlink all files created with the
.BR tmpfile (3)
function.
.RE
.LP
.BR rexit
is identical to 
.BR exit ,
except that the process image will be flagged to GS/OS as restartable.
.LP
.BR _exit
is similar to 
.BR exit ,
except that no clean up is done except for the flushing and closing of
any open streams.
.BR _exit
is the proper function to call when a child process exits while still
executing in the address space of its parent process, such as after
a failed
.BR execve (2)
call.
.LP
Passing arbitrary values back to the environment as
.BR status
is considered bad style.  Instead, use the values as described in
.BR sysexits (3).
.SH RETURN VALUES
The
.BR exit 
function
never returns.
.SH SEE ALSO
.BR atexit (3),
.BR intro (3),
.BR tmpfile (3),
.BR sysexits (3)
.SH STANDARDS
The
.BR exit 
function
conforms to ANSI/C.  The
.BR _exit
function is defined by POSIX 1003.1-88.