platform_bionic/libc/bionic/bionic_clone.c
Jin Wei 22d366cc09 enable clone system call for x86
Add __bionic_clone function for x86, which will be
used for clone system call.

Change-Id: I889dc9bf4b7ebb4358476e17e6f3233e26491f4d
Signed-off-by: Jin Wei <wei.a.jin@intel.com>
Signed-off-by: Xiaokang Qin <xiaokang.qin@intel.com>
Signed-off-by: Beare, Bruce J <bruce.j.beare@intel.com>
Signed-off-by: Jack Ren <jack.ren@intel.com>
Author-tracking-BZ: 51414
2012-08-15 17:04:50 -07:00

78 lines
2.8 KiB
C

/*
* Copyright (C) 2010 The Android Open Source Project
* 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 OWNER 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.
*/
#define __GNU_SOURCE 1
#include <sched.h>
#include <stdlib.h>
#include <stdarg.h>
#include <stdio.h>
extern int __bionic_clone(unsigned long clone_flags,
void* newsp,
int *parent_tidptr,
void *new_tls,
int *child_tidptr,
int (*fn)(void *),
void *arg);
extern void _exit_thread(int retCode);
/* this function is called from the __bionic_clone
* assembly fragment to call the thread function
* then exit. */
extern void
__bionic_clone_entry( int (*fn)(void *), void *arg )
{
int ret = (*fn)(arg);
_exit_thread(ret);
}
int
clone(int (*fn)(void *), void *child_stack, int flags, void* arg, ...)
{
va_list args;
int *parent_tidptr = NULL;
void *new_tls = NULL;
int *child_tidptr = NULL;
int ret;
/* extract optional parameters - they are cummulative */
va_start(args, arg);
if (flags & (CLONE_PARENT_SETTID|CLONE_SETTLS|CLONE_CHILD_SETTID)) {
parent_tidptr = va_arg(args, int*);
}
if (flags & (CLONE_SETTLS|CLONE_CHILD_SETTID)) {
new_tls = va_arg(args, void*);
}
if (flags & CLONE_CHILD_SETTID) {
child_tidptr = va_arg(args, int*);
}
va_end(args);
ret = __bionic_clone(flags, child_stack, parent_tidptr, new_tls, child_tidptr, fn, arg);
return ret;
}