From 01c165cd1b2ac601d5ae73d3cb5e82ccdd94ac94 Mon Sep 17 00:00:00 2001 From: Le Chi Thu Date: Tue, 3 Apr 2012 01:23:00 +0200 Subject: Initial commit --- ltp_framework/lib/cloner.c | 111 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 111 insertions(+) create mode 100644 ltp_framework/lib/cloner.c (limited to 'ltp_framework/lib/cloner.c') diff --git a/ltp_framework/lib/cloner.c b/ltp_framework/lib/cloner.c new file mode 100644 index 0000000..bf9eed1 --- /dev/null +++ b/ltp_framework/lib/cloner.c @@ -0,0 +1,111 @@ +/* + * Copyright (c) International Business Machines Corp., 2009 + * Some wrappers for clone functionality. Thrown together by Serge Hallyn + * based on existing clone usage in ltp. + * + * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#ifndef _GNU_SOURCE +#define _GNU_SOURCE +#endif + +#include +#include +#include /* fork, getpid, sleep */ +#include +#include /* exit */ +#include /* clone */ +#include "test.h" + +#undef clone /* we want to use clone() */ + +/* copied from several other files under ltp */ +#if defined (__s390__) || (__s390x__) +#define clone __clone +extern int __clone(int(void*),void*,int,void*); +#elif defined(__ia64__) +#define clone2 __clone2 +/* Prototype provided by David Mosberger */ +extern int __clone2(int (*fn) (void *arg), void *child_stack_base, + size_t child_stack_size, int flags, void *arg, + pid_t *parent_tid, void *tls, pid_t *child_tid); +#endif + +/*********************************************************************** + * ltp_clone: wrapper for clone to hide the architecture dependencies. + * 1. hppa takes bottom of stack and no stacksize (stack grows up) + * 2. __ia64__ takes bottom of stack and uses clone2 + * 3. all others take top of stack (stack grows down) + ***********************************************************************/ +int +ltp_clone(unsigned long clone_flags, int (*fn)(void *arg), void *arg, + size_t stack_size, void *stack) +{ + int ret; + +#if defined(__hppa__) + ret = clone(fn, stack, clone_flags, arg); +#elif defined(__ia64__) + ret = clone2(fn, stack, stack_size, clone_flags, arg, NULL, NULL, NULL); +#else + /* + * For archs where stack grows downwards, stack points to the topmost + * address of the memory space set up for the child stack. + */ + ret = clone(fn, (stack ? stack + stack_size : NULL), + clone_flags, arg); +#endif + + return ret; +} + +/*********************************************************************** + * ltp_clone_malloc: also does the memory allocation for clone with a + * caller-specified size. + ***********************************************************************/ +int +ltp_clone_malloc(unsigned long clone_flags, int (*fn)(void *arg), void *arg, + size_t stack_size) +{ + void *stack; + int ret; + int saved_errno; + + if ((stack = malloc(stack_size)) == NULL) + return -1; + + ret = ltp_clone(clone_flags, fn, arg, stack_size, stack); + + if (ret == -1) { + saved_errno = errno; + free(stack); + errno = saved_errno; + } + + return ret; +} + +/*********************************************************************** + * ltp_clone_quick: calls ltp_clone_malloc with predetermined stack size. + * Experience thus far suggests that one page is often insufficient, + * while 4*getpagesize() seems adequate. + ***********************************************************************/ +int +ltp_clone_quick(unsigned long clone_flags, int (*fn)(void *arg), void *arg) +{ + size_t stack_size = getpagesize() * 4; + + return ltp_clone_malloc(clone_flags, fn, arg, stack_size); +} \ No newline at end of file -- cgit v1.2.3