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ON_EXIT(3)                 Linux Programmer's ManualON_EXIT(3)NAME       on_exit  -  register a function to be called at normal process termina-       tionSYNOPSIS       #include <stdlib.h>       int on_exit(void (*function)(int , void *), 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_SOURCEDESCRIPTION       The on_exit() function registers the given function  to  be  called  at       normal  process termination, whether viaexit(3) or via return from the       program's main().  The function is passed the status argument given  to       the last call toexit(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 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       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 |       +----------+---------------+---------+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 standardatexit(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)COLOPHON       This  page  is  part of release 5.05 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                               2019-08-02ON_EXIT(3)