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-'\" t
-.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.\" References consulted:
-.\"     Linux libc source code
-.\"     Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
-.\"     386BSD man pages
-.\" Modified 1993-04-02, David Metcalfe
-.\" Modified 1993-07-25, Rik Faith (faith@cs.unc.edu)
-.TH on_exit 3 (date) "Linux man-pages (unreleased)"
-.SH NAME
-on_exit \- register a function to be called at normal process termination
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <stdlib.h>
-.PP
-.BI "int on_exit(void (*" function ")(int, void *), void *" arg );
-.fi
-.PP
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.PP
-.BR on_exit ():
-.nf
-    Since glibc 2.19:
-        _DEFAULT_SOURCE
-    glibc 2.19 and earlier:
-        _BSD_SOURCE || _SVID_SOURCE
-.fi
-.SH DESCRIPTION
-The
-.BR on_exit ()
-function registers the given
-.I function
-to be
-called at normal process termination, whether via
-.BR exit (3)
-or via return from the program's
-.IR main ().
-The
-.I function
-is passed the status argument given to the last call to
-.BR exit (3)
-and the
-.I arg
-argument from
-.BR on_exit ().
-.PP
-The same function may be registered multiple times:
-it is called once for each registration.
-.PP
-When a child process is created via
-.BR fork (2),
-it inherits copies of its parent's registrations.
-Upon a successful call to one of the
-.BR exec (3)
-functions, all registrations are removed.
-.SH RETURN VALUE
-The
-.BR on_exit ()
-function returns the value 0 if successful; otherwise
-it returns a nonzero value.
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.ad l
-.nh
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface	Attribute	Value
-T{
-.BR on_exit ()
-T}	Thread safety	MT-Safe
-.TE
-.hy
-.ad
-.sp 1
-.SH STANDARDS
-None.
-.SH HISTORY
-SunOS 4, glibc.
-Removed in Solaris (SunOS 5).
-Use the standard
-.BR atexit (3)
-instead.
-.SH CAVEATS
-By the time
-.I function
-is executed, stack
-.RI ( auto )
-variables may already have gone out of scope.
-Therefore,
-.I arg
-should not be a pointer to a stack variable;
-it may however be a pointer to a heap variable or a global variable.
-.SH SEE ALSO
-.BR _exit (2),
-.BR atexit (3),
-.BR exit (3)