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/*
* Copyright (c) 1997-1999 University of Utah and the Flux Group.
* All rights reserved.
*
* This file is part of the Flux OSKit. The OSKit is free software, also known
* as "open source;" you can redistribute it and/or modify it under the terms
* of the GNU General Public License (GPL), version 2, as published by the Free
* Software Foundation (FSF). To explore alternate licensing terms, contact
* the University of Utah at csl-dist@cs.utah.edu or +1-801-585-3271.
*
* The OSKit is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GPL for more details. You should have
* received a copy of the GPL along with the OSKit; see the file COPYING. If
* not, write to the FSF, 59 Temple Place #330, Boston, MA 02111-1307, USA.
*/
/*
* The point of this code is to ensure that the atexit routines that are
* needed to clean up the startup library, get run as the very last
* atexit, and as a block. Relying on libc atexit has the undesirable effect
* of scattering the startup library atexits around, and possibly even causing
* them to run before all the libc atexits run.
*/
#include <oskit/c/stdio.h>
#include <oskit/c/stdlib.h>
#include <oskit/c/unistd.h>
#include <oskit/startup.h>
typedef void (*atexit_function_ptr)(void *arg);
struct startup_atexit_func {
atexit_function_ptr func;
void *arg;
};
static struct startup_atexit_func startup_atexit_functions[16];
static int startup_atexit_index = 0;
static void run_startup_atexits(void);
static int startup_atexit_ready;
void
startup_atexit_init(void)
{
if (! startup_atexit_ready) {
atexit(run_startup_atexits);
startup_atexit_ready = 1;
}
}
int
startup_atexit(void (*function)(void *arg), void *arg)
{
if (!startup_atexit_ready)
startup_atexit_init();
/*
* We support only 16 atexit functions.
*/
if (startup_atexit_index >= 16)
return -1;
startup_atexit_functions[startup_atexit_index].func = function;
startup_atexit_functions[startup_atexit_index].arg = arg;
startup_atexit_index++;
return 0;
}
/*
* Call atexit functions in reverse order.
*/
static void
run_startup_atexits(void)
{
int i;
for (i = startup_atexit_index - 1; i >= 0; i--) {
atexit_function_ptr func;
void *arg;
func = startup_atexit_functions[i].func;
arg = startup_atexit_functions[i].arg;
func(arg);
}
}
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