genericopenlibs/cstdlib/LPOSIX/ATEXIT.C
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/* ATEXIT.C
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 * 
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 * Portions Copyright (c) 1990-2006 Nokia Corporation and/or its subsidiary(-ies).
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 * All rights reserved.
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 */
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/*
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 * Copyright (c) 1990 Regents of the University of California.
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 * All rights reserved.
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 *
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 * %sccs.include.redist.c%
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 */
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/*
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FUNCTION
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<<atexit>>---request execution of functions at program exit
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INDEX
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	atexit
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ANSI_SYNOPSIS
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	#include <stdlib.h>
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	int atexit(void (*<[function]>)(void);
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TRAD_SYNOPSIS
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	#include <stdlib.h>
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	int atexit((<[function]>)
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	void (*<[function]>)();
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DESCRIPTION
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You can use <<atexit>> to enroll functions in a list of functions that
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will be called when your program terminates normally.  The argument is
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a pointer to a user-defined function (which must not require arguments and
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must not return a result).
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The functions are kept in a LIFO stack; that is, the last function
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enrolled by <<atexit>> will be the first to execute when your program
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exits.
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There is no built-in limit to the number of functions you can enroll
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in this list; however, after every group of 32 functions is enrolled,
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<<atexit>> will call <<malloc>> to get space for the next part of the
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list.   The initial list of 32 functions is statically allocated, so
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you can always count on at least that many slots available.
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RETURNS
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<<atexit>> returns <<0>> if it succeeds in enrolling your function,
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<<-1>> if it fails (possible only if no space was available for
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<<malloc>> to extend the list of functions or the library globals could not
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be allocated).
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PORTABILITY
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<<atexit>> is required by the ANSI standard, which also specifies that
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implementations must support enrolling at least 32 functions.
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Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>,
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<<lseek>>, <<read>>, <<sbrk>>, <<write>>.
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*/
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#include <stddef.h>
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#include <stdlib.h>
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#include <reent.h>
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/*
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 * Register a function to be performed at exit.
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 * NB. MSVC 5.0 has a built-in prototype for atexit, so we have to use a #define
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 * to map the name atexit to _epoc32_atexit
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 */
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/*
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@return On Success, returns 0.
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		On Failure, returns -1.
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*/
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EXPORT_C int
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_epoc32_atexit (void (*fn)(void))
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{
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  register struct _atexit *p;
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  struct _reent *rp = _REENT2;
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  if (!rp)
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	return -1; // Memory for library globals is not allocated (errno not set). 
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  if ((p = rp->_atexit) == NULL)
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    rp->_atexit = p = &rp->_atexit0;
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  if (p->_ind >= _ATEXIT_SIZE)
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    {
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      if ((p = (struct _atexit *) malloc (sizeof *p)) == NULL)
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		return -1;
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      p->_ind = 0;
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      p->_next = rp->_atexit;
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      rp->_atexit = p;
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    }
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  p->_fns[p->_ind++] = fn;
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  return 0;
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}
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EXPORT_C void 
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_atexit_processing_r (struct _reent *rp)
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{
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  register struct _atexit *p;
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  register int n;
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  for (p = rp->_atexit; p; p = p->_next)
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    for (n = p->_ind; --n >= 0;)
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      (*p->_fns[n]) ();
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  if (rp->__cleanup)
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    (*rp->__cleanup) (rp);
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}