Name

on_exit — register a function to be called at normal process termination

Synopsis

        #include <stdlib.h>
int on_exit( void (*function)(int, void *),
  void *arg);
 
[Note] Note
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
on_exit():
Since glibc 2.19:
_DEFAULT_SOURCE Glibc 2.19 and earlier:
_BSD_SOURCE || _SVID_SOURCE

DESCRIPTION

The on_exit() function registers the given function to be called at normal process termination, whether via exit(3) or via return from the program's main(). The function is passed the status argument given to the last call to exit(3) and the arg argument from on_exit().

The same function may be registered multiple times: it is called once for each registration.

When a child process is created via fork(2), it inherits copies of its parent's registrations. Upon a successful call to one of the exec(3) functions, all registrations are removed.

RETURN VALUE

The on_exit() function returns the value 0 if successful; otherwise it returns a nonzero value.

ATTRIBUTES

For an explanation of the terms used in this section, see attributes(7).

Interface Attribute Value
on_exit() Thread safety MT-Safe

CONFORMING TO

This function comes from SunOS 4, but is also present in glibc. It no longer occurs in Solaris (SunOS 5). Portable application should avoid this function, and use the standard atexit(3) instead.

SEE ALSO

_exit(2), atexit(3), exit(3)

COLOPHON

This page is part of release 4.16 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man−pages/.


  Copyright 1993 David Metcalfe (davidprism.demon.co.uk)

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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 (faithcs.unc.edu)