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/*
* Copyright (c) International Business Machines Corp., 2009
* Some wrappers for clone functionality. Thrown together by Serge Hallyn
* <serue@us.ibm.com> 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 <stdio.h>
#include <errno.h>
#include <unistd.h> /* fork, getpid, sleep */
#include <string.h>
#include <stdlib.h> /* exit */
#include <sched.h> /* 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);
}
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