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

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

       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.

       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.

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

       Standard C library (libc, -lc)

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

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

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

Linux man-pages 6.9.1                              2024-05-02                                         on_exit(3)

       None.

#include<stdlib.h>inton_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