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ON_EXIT(3) Linux Programmer's Manual ON_EXIT(3)
on_exit - register a function to be called at normal process
termination
#include <stdlib.h>
int on_exit(void (*function)(int, void *), 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 │
└──────────────────────────────────────┴───────────────┴─────────┘
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.
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 release 5.13 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/.
GNU 2021-03-22 ON_EXIT(3)
Pages that refer to this page: execve(2), _exit(2), atexit(3), exit(3)
Copyright and license for this manual page
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