-// ----------------------------------------------------------------------------
-// $Id$
-// ----------------------------------------------------------------------------
-// Public Domain C Library - http://pdclib.sourceforge.net
-// This code is Public Domain. Use, modify, and redistribute at will.
-// ----------------------------------------------------------------------------
-
-// TODO: C/C++ linkages
-int atexit( void (*func) ( void ) ) { /* TODO */ };
+/* $Id$ */
+
+/* Release $Name$ */
+
+/* atexit( void (*)( void ) )
+
+ This file is part of the Public Domain C Library (PDCLib).
+ Permission is granted to use, modify, and / or redistribute at will.
+*/
+
+#include <stdlib.h>
+
+#ifndef REGTEST
+
+/* TODO: Required by both atexit() and exit(). */
+struct _PDCLIB_exitfunc_t
+{
+ struct _PDCLIB_exitfunc_t * next;
+ void (*func)( void );
+};
+
+extern struct _PDCLIB_exitfunc_t * regstack;
+
+int atexit( void (*func)( void ) )
+{
+ struct _PDCLIB_exitfunc_t * regfunc = (struct _PDCLIB_exitfunc_t *)malloc( sizeof( struct _PDCLIB_exitfunc_t ) );
+ if ( regfunc == NULL )
+ {
+ return -1;
+ }
+ else
+ {
+ regfunc->func = func;
+ regfunc->next = regstack;
+ regstack = regfunc;
+ return 0;
+ }
+}
+
+#endif
+
+#ifdef TEST
+#include <_PDCLIB_test.h>
+
+int main()
+{
+ int NO_TESTDRIVER = 0;
+ BEGIN_TESTS;
+ TESTCASE( NO_TESTDRIVER );
+ return TEST_RESULTS;
+}
+
+#endif