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| 1 | .\" Copyright (c) 1980 Regents of the University of California.
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| 2 | .\" All rights reserved. The Berkeley software License Agreement
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| 3 | .\" specifies the terms and conditions for redistribution.
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| 4 | .\"
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| 5 | .\" @(#)exit.2 6.4 (Berkeley) 5/22/86
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| 6 | .\"
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| 7 | .TH EXIT 2 "May 22, 1986"
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| 8 | .UC 4
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| 9 | .SH NAME
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| 10 | exit, _exit \- terminate a process
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| 11 | .SH SYNOPSIS
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| 12 | .nf
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| 13 | .ft B
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| 14 | void _exit(int \fIstatus\fP)
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| 15 | .fi
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| 16 | .SH DESCRIPTION
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| 17 | .de SP
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| 18 | .if t .sp 0.4
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| 19 | .if n .sp
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| 20 | ..
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| 21 | .B _exit
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| 22 | terminates a process with the following consequences:
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| 23 | .RS
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| 24 | .SP
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| 25 | All of the descriptors open in the calling process are closed.
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| 26 | This may entail delays, for example, waiting for output to drain;
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| 27 | a process in this state may not be killed, as it is already dying.
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| 28 | .SP
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| 29 | If the parent process of the calling process is executing a
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| 30 | .B wait
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| 31 | or is interested in the SIGCHLD signal (Minix-vmd),
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| 32 | then it is notified of the calling process's termination and
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| 33 | the low-order eight bits of \fIstatus\fP are made available to it;
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| 34 | see
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| 35 | .BR wait (2).
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| 36 | .SP
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| 37 | The parent process ID of all of the calling process's existing child
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| 38 | processes are also set to 1. This means that the initialization process
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| 39 | (see
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| 40 | .BR intro (2))
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| 41 | inherits each of these processes as well.
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| 42 | .ig
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| 43 | Any stopped children are restarted with a hangup signal (SIGHUP).
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| 44 | ..
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| 45 | .RE
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| 46 | .PP
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| 47 | Most C programs call the library routine
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| 48 | .BR exit (3),
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| 49 | which performs cleanup actions in the standard I/O library before
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| 50 | calling \fI_exit\fP\|.
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| 51 | .SH "RETURN VALUE"
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| 52 | This call never returns.
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| 53 | .SH "SEE ALSO"
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| 54 | .BR fork (2),
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| 55 | .BR sigaction (2),
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| 56 | .BR wait (2),
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| 57 | .BR exit (3).
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