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-.\" Copyright (c) 1990, 1991 The Regents of the University of California.
-.\" All rights reserved.
-.\"
-.\" This code is derived from software contributed to Berkeley by
-.\" Chris Torek and the American National Standards Committee X3,
-.\" on Information Processing Systems.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\" 3. Neither the name of the University nor the names of its contributors
-.\"    may be used to endorse or promote products derived from this software
-.\"    without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.\"     $OpenBSD: atexit.3,v 1.13 2022/02/06 00:29:02 jsg Exp $
-.\"
-.Dd $Mdocdate: February 6 2022 $
-.Dt ATEXIT 3
-.Os
-.Sh NAME
-.Nm atexit
-.Nd register a function to be called on exit
-.Sh SYNOPSIS
-.In stdlib.h
-.Ft int
-.Fn atexit "void (*function)(void)"
-.Sh DESCRIPTION
-The
-.Fn atexit
-function registers the given
-.Fa function
-to be called at program exit, whether via
-.Xr exit 3
-or via return from the program's
-.Fn main .
-Functions so registered are called in reverse order;
-no arguments are passed.
-At least 32 functions can always be registered,
-and more are allowed as long as sufficient memory can be allocated.
-.Pp
-If a shared object is unloaded from process memory using
-.Xr dlclose 3 ,
-then any functions registered by calling
-.Fn atexit
-from that shared object will be called in reverse order and unregistered.
-Note that it is the source of the call to
-.Fn atexit
-that matters, not the source of the function that was registered.
-.Pp
-.Fn atexit
-is very difficult to use correctly without creating
-.Xr exit 3 Ns -time
-races.
-Unless absolutely necessary, avoid using it.
-.Sh RETURN VALUES
-The
-.Nm
-function returns the value 0 if successful; otherwise a non-zero
-value is returned and the global variable
-.Va errno
-is set to indicate the error.
-.Sh ERRORS
-.Bl -tag -width Er
-.It Bq Er ENOMEM
-No memory was available to add the function to the list.
-The existing list of functions is unmodified.
-.El
-.Sh SEE ALSO
-.Xr dlclose 3 ,
-.Xr exit 3
-.Sh STANDARDS
-The
-.Fn atexit
-function conforms to
-.St -ansiC .
-.Pp
-Setting
-.Va errno
-on error and the behavior when a shared object is unloaded
-are extensions to that standard.