1/*
2 * Copyright (C) 2010 The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *  * Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 *  * Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in
12 *    the documentation and/or other materials provided with the
13 *    distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28#define __GNU_SOURCE 1
29#include <sched.h>
30#include <stdlib.h>
31#include <stdarg.h>
32#include <stdio.h>
33
34extern int  __bionic_clone(unsigned long   clone_flags,
35                           void*           newsp,
36                           int            *parent_tidptr,
37                           void           *new_tls,
38                           int            *child_tidptr,
39                           int            (*fn)(void *),
40                           void          *arg);
41
42extern void _exit_thread(int  retCode);
43
44/* this function is called from the __bionic_clone
45 * assembly fragment to call the thread function
46 * then exit. */
47extern void
48__bionic_clone_entry( int (*fn)(void *), void *arg )
49{
50    int  ret = (*fn)(arg);
51    _exit_thread(ret);
52}
53
54int
55clone(int (*fn)(void *), void *child_stack, int flags, void*  arg, ...)
56{
57    va_list  args;
58    int     *parent_tidptr = NULL;
59    void    *new_tls = NULL;
60    int     *child_tidptr = NULL;
61
62    /* extract optional parameters - they are cumulative. */
63    va_start(args, arg);
64    if (flags & (CLONE_PARENT_SETTID|CLONE_SETTLS|CLONE_CHILD_SETTID)) {
65        parent_tidptr = va_arg(args, int*);
66    }
67    if (flags & (CLONE_SETTLS|CLONE_CHILD_SETTID)) {
68        new_tls = va_arg(args, void*);
69    }
70    if (flags & CLONE_CHILD_SETTID) {
71        child_tidptr = va_arg(args, int*);
72    }
73    va_end(args);
74
75    return __bionic_clone(flags, child_stack, parent_tidptr, new_tls, child_tidptr, fn, arg);
76}
77