ON_EXIT(3)		   Linux Programmer's Manual		    ON_EXIT(3)



NAME
       on_exit	-  register a function to be called at normal process termina-
       tion

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
       attributes(7).

       +----------+---------------+---------+
       |Interface | Attribute	  | Value   |
       +----------+---------------+---------+
       |on_exit() | Thread safety | MT-Safe |
       +----------+---------------+---------+

CONFORMING TO
       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.

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

COLOPHON
       This page is part of release 4.10 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				  2016-03-15			    ON_EXIT(3)