on_exit(3) Library Functions Manual on_exit(3)
NAME
on_exit - register a function to be called at normal process termina-
tion
LIBRARY
Standard C library (libc, -lc)
SYNOPSIS
#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
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 at-
tributes(7).
┌────────────────────────────────────────────┬───────────────┬─────────┐
│Interface │ Attribute │ Value │
├────────────────────────────────────────────┼───────────────┼─────────┤
│on_exit() │ Thread safety │ MT-Safe │
└────────────────────────────────────────────┴───────────────┴─────────┘
STANDARDS
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.
NOTES
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.
SEE ALSO
_exit(2), atexit(3), exit(3)
Linux man-pages 6.03 2023-02-05 on_exit(3)
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