4.2BSD/usr/man/man2/exit.2

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.TH EXIT 2 "27 July 1983"
.UC 4
.SH NAME
_exit \- terminate a process
.SH SYNOPSIS
.nf
.ft B
_exit(status)
int status;
.fi
.SH DESCRIPTION
.I _exit
terminates a process with the following consequences:
.in +5n
.PP
All of the descriptors open in the calling process are closed.
.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.
.in -5n
.PP
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), wait(2), exit(3)