auto import from //depot/cupcake/@135843

1 files changed, 0 insertions, 209 deletions

diff --git a/libc/stdlib/atexit.c b/libc/stdlib/atexit.c
deleted file mode 100644
index 5bf82ba..0000000
--- a/libc/stdlib/atexit.c
+++ /dev/null
@@ -1,209 +0,0 @@
-/*	$OpenBSD: atexit.c,v 1.14 2007/09/05 20:47:47 chl Exp $ */
-/*
- * Copyright (c) 2002 Daniel Hartmeier
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- *    - Redistributions of source code must retain the above copyright
- *      notice, this list of conditions and the following disclaimer.
- *    - Redistributions in binary form must reproduce the above
- *      copyright notice, this list of conditions and the following
- *      disclaimer in the documentation and/or other materials provided
- *      with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
- * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- *
- */
-
-#include <sys/types.h>
-#include <sys/mman.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-#include "atexit.h"
-#include "thread_private.h"
-
-int __atexit_invalid = 1;
-struct atexit *__atexit;
-
-/*
- * Function pointers are stored in a linked list of pages. The list
- * is initially empty, and pages are allocated on demand. The first
- * function pointer in the first allocated page (the last one in
- * the linked list) is reserved for the cleanup function.
- *
- * Outside the following functions, all pages are mprotect()'ed
- * to prevent unintentional/malicious corruption.
- */
-
-/*
- * Register a function to be performed at exit or when a shared object
- * with the given dso handle is unloaded dynamically.  Also used as
- * the backend for atexit().  For more info on this API, see:
- *
- *	http://www.codesourcery.com/cxx-abi/abi.html#dso-dtor
- */
-int
-__cxa_atexit(void (*func)(void *), void *arg, void *dso)
-{
-	struct atexit *p = __atexit;
-	struct atexit_fn *fnp;
-	int pgsize = getpagesize();
-	int ret = -1;
-
-	if (pgsize < (int)sizeof(*p))
-		return (-1);
-	_ATEXIT_LOCK();
-	p = __atexit;
-	if (p != NULL) {
-		if (p->ind + 1 >= p->max)
-			p = NULL;
-		else if (mprotect(p, pgsize, PROT_READ | PROT_WRITE))
-			goto unlock;
-	}
-	if (p == NULL) {
-		p = mmap(NULL, pgsize, PROT_READ | PROT_WRITE,
-		    MAP_ANON | MAP_PRIVATE, -1, 0);
-		if (p == MAP_FAILED)
-			goto unlock;
-		if (__atexit == NULL) {
-			memset(&p->fns[0], 0, sizeof(p->fns[0]));
-			p->ind = 1;
-		} else
-			p->ind = 0;
-		p->max = (pgsize - ((char *)&p->fns[0] - (char *)p)) /
-		    sizeof(p->fns[0]);
-		p->next = __atexit;
-		__atexit = p;
-		if (__atexit_invalid)
-			__atexit_invalid = 0;
-	}
-	fnp = &p->fns[p->ind++];
-	fnp->fn_ptr.cxa_func = func;
-	fnp->fn_arg = arg;
-	fnp->fn_dso = dso;
-	if (mprotect(p, pgsize, PROT_READ))
-		goto unlock;
-	ret = 0;
-unlock:
-	_ATEXIT_UNLOCK();
-	return (ret);
-}
-
-/*
- * Register a function to be performed at exit.
- */
-int
-atexit(void (*func)(void))
-{
-	return (__cxa_atexit((void (*)(void *))func, NULL, NULL));
-}
-
-/*
- * Call all handlers registered with __cxa_atexit() for the shared
- * object owning 'dso'.
- * Note: if 'dso' is NULL, then all remaining handlers are called.
- */
-void
-__cxa_finalize(void *dso)
-{
-	struct atexit *p, *q;
-	struct atexit_fn fn;
-	int n, pgsize = getpagesize();
-	static int call_depth;
-
-	if (__atexit_invalid)
-		return;
-
-	call_depth++;
-
-	for (p = __atexit; p != NULL; p = p->next) {
-		for (n = p->ind; --n >= 0;) {
-			if (p->fns[n].fn_ptr.cxa_func == NULL)
-				continue;	/* already called */
-			if (dso != NULL && dso != p->fns[n].fn_dso)
-				continue;	/* wrong DSO */
-
-			/*
-			 * Mark handler as having been already called to avoid
-			 * dupes and loops, then call the appropriate function.
-			 */
-			fn = p->fns[n];
-			if (mprotect(p, pgsize, PROT_READ | PROT_WRITE) == 0) {
-				p->fns[n].fn_ptr.cxa_func = NULL;
-				mprotect(p, pgsize, PROT_READ);
-			}
-			if (dso != NULL)
-				(*fn.fn_ptr.cxa_func)(fn.fn_arg);
-			else
-				(*fn.fn_ptr.std_func)();
-		}
-	}
-
-	/*
-	 * If called via exit(), unmap the pages since we have now run
-	 * all the handlers.  We defer this until calldepth == 0 so that
-	 * we don't unmap things prematurely if called recursively.
-	 */
-	if (dso == NULL && --call_depth == 0) {
-		for (p = __atexit; p != NULL; ) {
-			q = p;
-			p = p->next;
-			munmap(q, pgsize);
-		}
-		__atexit = NULL;
-	}
-}
-
-/*
- * Register the cleanup function
- */
-void
-__atexit_register_cleanup(void (*func)(void))
-{
-	struct atexit *p;
-	int pgsize = getpagesize();
-
-	if (pgsize < (int)sizeof(*p))
-		return;
-	_ATEXIT_LOCK();
-	p = __atexit;
-	while (p != NULL && p->next != NULL)
-		p = p->next;
-	if (p == NULL) {
-		p = mmap(NULL, pgsize, PROT_READ | PROT_WRITE,
-		    MAP_ANON | MAP_PRIVATE, -1, 0);
-		if (p == MAP_FAILED)
-			goto unlock;
-		p->ind = 1;
-		p->max = (pgsize - ((char *)&p->fns[0] - (char *)p)) /
-		    sizeof(p->fns[0]);
-		p->next = NULL;
-		__atexit = p;
-		if (__atexit_invalid)
-			__atexit_invalid = 0;
-	} else {
-		if (mprotect(p, pgsize, PROT_READ | PROT_WRITE))
-			goto unlock;
-	}
-	p->fns[0].fn_ptr.std_func = func;
-	p->fns[0].fn_arg = NULL;
-	p->fns[0].fn_dso = NULL;
-	mprotect(p, pgsize, PROT_READ);
-unlock:
-	_ATEXIT_UNLOCK();
-}