23d2383783
It seems a shame to ruin the patina of the June 4, 1993 date on abort.3, especially since it still matched the date of the SCCS ID, but those are the rules. Reported by: araujo MFC after: 3 days Sponsored by: Dell EMC
134 lines
3.6 KiB
Groff
134 lines
3.6 KiB
Groff
.\" Copyright (c) 1990, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" This code is derived from software contributed to Berkeley by
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.\" the American National Standards Committee X3, on Information
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.\" Processing Systems.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)exit.3 8.1 (Berkeley) 6/4/93
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.\" $FreeBSD$
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.\"
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.Dd May 28, 2018
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.Dt EXIT 3
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.Os
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.Sh NAME
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.Nm exit , _Exit
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.Nd perform normal program termination
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In stdlib.h
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.Ft void
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.Fn exit "int status"
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.Ft void
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.Fn _Exit "int status"
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.Sh DESCRIPTION
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The
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.Fn exit
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and
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.Fn _Exit
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functions terminate a process.
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.Pp
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Before termination,
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.Fn exit
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performs the following functions in the order listed:
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.Bl -enum -offset indent
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.It
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Call the functions registered with the
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.Xr atexit 3
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function, in the reverse order of their registration.
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.It
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Flush all open output streams.
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.It
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Close all open streams.
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.It
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Unlink all files created with the
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.Xr tmpfile 3
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function.
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.El
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.Pp
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The
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.Fn _Exit
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function terminates without calling the functions registered with the
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.Xr atexit 3
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function, and may or may not perform the other actions listed.
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Both functions make the low-order eight bits of the
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.Fa status
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argument available to a parent process which has called a
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.Xr wait 2 Ns -family
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function.
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.Pp
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The C Standard
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.Pq St -isoC-99
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defines the values
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.Li 0 ,
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.Dv EXIT_SUCCESS ,
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and
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.Dv EXIT_FAILURE
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as possible values of
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.Fa status .
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Cooperating processes may use other values;
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in a program which might be called by a mail transfer agent, the
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values described in
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.Xr sysexits 3
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may be used to provide more information to the parent process.
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.Pp
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Note that
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.Fn exit
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does nothing to prevent bottomless recursion should a function registered
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using
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.Xr atexit 3
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itself call
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.Fn exit .
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Such functions must call
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.Fn _Exit
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instead (although this has other effects as well which may not be desired).
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.Sh RETURN VALUES
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The
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.Fn exit
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and
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.Fn _Exit
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functions
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never return.
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.Sh SEE ALSO
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.Xr _exit 2 ,
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.Xr abort2 2 ,
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.Xr wait 2 ,
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.Xr at_quick_exit 3 ,
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.Xr atexit 3 ,
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.Xr intro 3 ,
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.Xr quick_exit 3 ,
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.Xr sysexits 3 ,
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.Xr tmpfile 3
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.Sh STANDARDS
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The
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.Fn exit
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and
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.Fn _Exit
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functions conform to
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.St -isoC-99 .
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