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Diffstat (limited to 'man3/exit.3')
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diff --git a/man3/exit.3 b/man3/exit.3 new file mode 100644 index 000000000..1d5e0dec4 --- /dev/null +++ b/man3/exit.3 @@ -0,0 +1,96 @@ +.\" Copyright (C) 2001 Andries Brouwer <aeb@cwi.nl>. +.\" +.\" Permission is granted to make and distribute verbatim copies of this +.\" manual provided the copyright notice and this permission notice are +.\" preserved on all copies. +.\" +.\" Permission is granted to copy and distribute modified versions of this +.\" manual under the conditions for verbatim copying, provided that the +.\" entire resulting derived work is distributed under the terms of a +.\" permission notice identical to this one. +.\" +.\" Since the Linux kernel and libraries are constantly changing, this +.\" manual page may be incorrect or out-of-date. The author(s) assume no +.\" responsibility for errors or omissions, or for damages resulting from +.\" the use of the information contained herein. The author(s) may not +.\" have taken the same level of care in the production of this manual, +.\" which is licensed free of charge, as they might when working +.\" professionally. +.\" +.\" Formatted or processed versions of this manual, if unaccompanied by +.\" the source, must acknowledge the copyright and authors of this work. +.\" +.TH EXIT 3 2001-11-17 "" "Linux Programmer's Manual" +.SH NAME +exit \- cause normal program termination +.SH SYNOPSIS +.nf +.B #include <stdlib.h> +.sp +.BI "void exit(int " status ); +.fi +.SH DESCRIPTION +The \fBexit()\fP function causes normal program termination and the +the value of \fIstatus & 0377\fP is returned to the parent +(see +.BR wait (2)). +All functions registered with \fBatexit()\fP and \fBon_exit()\fP +are called in the reverse order of their registration, +and all open streams are flushed and closed. +Files created by \fItmpfile()\fP are removed. +.LP +The C standard specifies two defines \fIEXIT_SUCCESS\fP and \fIEXIT_FAILURE\fP +that may be passed to \fBexit()\fP to indicate successful or unsuccessful +termination, respectively. +.SH "RETURN VALUE" +The \fBexit()\fP function does not return. +.SH "CONFORMING TO" +SVID 3, POSIX, BSD 4.3, ISO 9899 (``ANSI C'') +.SH NOTES +During the exit processing, it is possible to register additional +functions with \fBatexit()\fP and \fBon_exit()\fP. +Always the last-registered function is removed from the chain +of registered functions, and invoked. +It is undefined what happens if during this processing +either \fBexit()\fP or \fBlongjmp()\fP is called. +.LP +The use of EXIT_SUCCESS and EXIT_FAILURE is slightly more portable +(to non-Unix environments) than that of 0 and some nonzero value +like 1 or \-1. In particular, VMS uses a different convention. +.LP +BSD has attempted to standardize exit codes - see the file +.IR <sysexits.h> . +.LP +After \fBexit()\fP, the exit status must be transmitted to the +parent process. There are three cases. If the parent has set +SA_NOCLDWAIT, or has set the SIGCHLD handler to SIG_IGN, the +status is discarded. If the parent was waiting on the child +it is notified of the exit status. In both cases the exiting +process dies immediately. If the parent has not indicated that +it is not interested in the exit status, but is not waiting, +the exiting process turns into a "zombie" process +(which is nothing but a container for the single byte representing +the exit status) so that the parent can learn the exit status when +it later calls one of the \fIwait()\fP functions. +.LP +If the implementation supports the SIGCHLD signal, this signal +is sent to the parent. If the parent has set SA_NOCLDWAIT, +it is undefined whether a SIGCHLD signal is sent. +.LP +If the process is a session leader and its controlling terminal +the controlling terminal of the session, then each process in +the foreground process group of this controlling terminal +is sent a SIGHUP signal, and the terminal is disassociated +from this session, allowing it to be acquired by a new controlling +process. +.LP +If the exit of the process causes a process group to become orphaned, +and if any member of the newly-orphaned process group is stopped, +then a SIGHUP signal followed by a SIGCONT signal will be +sent to each process in this process group. +.SH "SEE ALSO" +.BR _exit (2), +.BR wait (2), +.BR atexit (3), +.BR on_exit (3), +.BR tmpfile (3) |