From cf659fa4fe7369ac58ef547f744c0ff3f9fb137a Mon Sep 17 00:00:00 2001 From: Jelmer Vernooij Date: Thu, 23 Oct 2008 17:27:30 +0200 Subject: Import talloc_stack into util library. --- source3/lib/talloc_stack.c | 130 --------------------------------------------- 1 file changed, 130 deletions(-) delete mode 100644 source3/lib/talloc_stack.c (limited to 'source3/lib') diff --git a/source3/lib/talloc_stack.c b/source3/lib/talloc_stack.c deleted file mode 100644 index 2722fb9676..0000000000 --- a/source3/lib/talloc_stack.c +++ /dev/null @@ -1,130 +0,0 @@ -/* - Unix SMB/CIFS implementation. - Implement a stack of talloc contexts - Copyright (C) Volker Lendecke 2007 - - This program is free software; you can redistribute it and/or modify - it under the terms of the GNU General Public License as published by - the Free Software Foundation; either version 2 of the License, or - (at your option) any later version. - - This program 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 - GNU General Public License for more details. - - You should have received a copy of the GNU General Public License - along with this program; if not, write to the Free Software - Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. -*/ - -/* - * Implement a stack of talloc frames. - * - * When a new talloc stackframe is allocated with talloc_stackframe(), then - * the TALLOC_CTX returned with talloc_tos() is reset to that new - * frame. Whenever that stack frame is TALLOC_FREE()'ed, then the reverse - * happens: The previous talloc_tos() is restored. - * - * This API is designed to be robust in the sense that if someone forgets to - * TALLOC_FREE() a stackframe, then the next outer one correctly cleans up and - * resets the talloc_tos(). - * - * This robustness feature means that we can't rely on a linked list with - * talloc destructors because in a hierarchy of talloc destructors the parent - * destructor is called before its children destructors. The child destructor - * called after the parent would set the talloc_tos() to the wrong value. - */ - -#include "includes.h" - -static int talloc_stacksize; -static int talloc_stack_arraysize; -static TALLOC_CTX **talloc_stack; - -static int talloc_pop(TALLOC_CTX *frame) -{ - int i; - - for (i=talloc_stacksize-1; i>0; i--) { - if (frame == talloc_stack[i]) { - break; - } - talloc_free(talloc_stack[i]); - } - - talloc_stacksize = i; - return 0; -} - -/* - * Create a new talloc stack frame. - * - * When free'd, it frees all stack frames that were created after this one and - * not explicitly freed. - */ - -static TALLOC_CTX *talloc_stackframe_internal(size_t poolsize) -{ - TALLOC_CTX **tmp, *top, *parent; - - if (talloc_stack_arraysize < talloc_stacksize + 1) { - tmp = TALLOC_REALLOC_ARRAY(NULL, talloc_stack, TALLOC_CTX *, - talloc_stacksize + 1); - if (tmp == NULL) { - goto fail; - } - talloc_stack = tmp; - talloc_stack_arraysize = talloc_stacksize + 1; - } - - if (talloc_stacksize == 0) { - parent = talloc_stack; - } - else { - parent = talloc_stack[talloc_stacksize-1]; - } - - if (poolsize) { - top = talloc_pool(parent, poolsize); - } else { - top = talloc_new(parent); - } - - if (top == NULL) { - goto fail; - } - - talloc_set_destructor(top, talloc_pop); - - talloc_stack[talloc_stacksize++] = top; - return top; - - fail: - smb_panic("talloc_stackframe failed"); - return NULL; -} - -TALLOC_CTX *talloc_stackframe(void) -{ - return talloc_stackframe_internal(0); -} - -TALLOC_CTX *talloc_stackframe_pool(size_t poolsize) -{ - return talloc_stackframe_internal(poolsize); -} - -/* - * Get us the current top of the talloc stack. - */ - -TALLOC_CTX *talloc_tos(void) -{ - if (talloc_stacksize == 0) { - talloc_stackframe(); - DEBUG(0, ("no talloc stackframe around, leaking memory\n")); - } - - return talloc_stack[talloc_stacksize-1]; -} -- cgit