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on_exit(3) — Linux manual page

NAME \|LIBRARY \|SYNOPSIS \|DESCRIPTION \|RETURN VALUE \|ATTRIBUTES \|STANDARDS \|HISTORY \|CAVEATS \|SEE ALSO \|COLOPHON

on_exit(3)               Library Functions Manualon_exit(3)

NAME top

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

LIBRARY top

       Standard C library (libc,-lc)

SYNOPSIS top

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

DESCRIPTION top

       Theon_exit() function registers the givenfunction to be called       at normal process termination, whether viaexit(3) or via return       from the program'smain().  Thefunction is passed the status       argument given to the last call toexit(3) and thearg argument       fromon_exit().       The same function may be registered multiple times: it is called       once for each registration.       When a child process is created viafork(2), it inherits copies of       its parent's registrations.  Upon a successful call to one of theexec(3) functions, all registrations are removed.

RETURN VALUE top

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

ATTRIBUTES top

       For an explanation of the terms used in this section, seeattributes(7).       ┌──────────────────────────────────────┬───────────────┬─────────┐       │Interface│Attribute│Value│       ├──────────────────────────────────────┼───────────────┼─────────┤       │on_exit()                            │ Thread safety │ MT-Safe │       └──────────────────────────────────────┴───────────────┴─────────┘

STANDARDS top

       None.

HISTORY top

       SunOS 4, glibc.  Removed in Solaris (SunOS 5).  Use the standardatexit(3) instead.

CAVEATS top

       By the timefunction 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.

COLOPHON top

       This page is part of theman-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 isnot       part of the original manual page), send a mail to       man-pages@man7.orgLinux man-pages 6.15            2025-05-17on_exit(3)

Pages that refer to this page:execve(2), _exit(2), abort(3), atexit(3), exit(3)

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