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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ATTRIBUTES | STANDARDS | HISTORY | CAVEATS | SEE ALSO | COLOPHON |
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on_exit(3) Library Functions Manual on_exit(3)
on_exit - register a function to be called at normal process
termination
Standard C library (libc, -lc)
#include <stdlib.h>
int on_exit(typeof(void (int, void *)) *function, void *arg);
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
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.
The on_exit() function returns the value 0 if successful;
otherwise it returns a nonzero value.
For an explanation of the terms used in this section, see
attributes(7).
┌──────────────────────────────────────┬───────────────┬─────────┐
│ Interface │ Attribute │ Value │
├──────────────────────────────────────┼───────────────┼─────────┤
│ on_exit() │ Thread safety │ MT-Safe │
└──────────────────────────────────────┴───────────────┴─────────┘
None.
SunOS 4, glibc. Removed in Solaris (SunOS 5). Use the standard
atexit(3) instead.
By the time function is executed, stack (auto) variables may
already have gone out of scope. Therefore, arg should not be a
pointer to a stack variable; it may however be a pointer to a heap
variable or a global variable.
_exit(2), atexit(3), exit(3)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.15.tar.gz
fetched from
⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2025-08-11. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to
man-pages@man7.org
Linux man-pages 6.15 2025-05-17 on_exit(3)
Pages that refer to this page: execve(2), _exit(2), abort(3), atexit(3), exit(3)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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