V4/man/man2/exit.2

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.th EXIT II 8/5/73
.sh NAME
exit \*- terminate process
.s3
.sh SYNOPSIS
(exit = 1.)
.br
(status in r0)
.br
.ft B
sys exit
.s3
exit(status)
.br
int status;
.ft R
.sh DESCRIPTION
.it Exit
is the normal means of terminating a process.
.it Exit
closes all the process' files and notifies the parent process
if it is executing a
.it wait.
The low byte of r0
(resp. the argument to
\fIexit\fR)
is available as status to the parent process.
.s3
This call can never return.
.sh "SEE ALSO"
wait(II)
.sh DIAGNOSTICS
None.