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
34 /* WARNING: AT THE MOMENT, THIS IS ONLY SUPPORTED ON ARM
35 */
36
37 extern int __bionic_clone(unsigned long clone_flags,
38 void* newsp,
39 int *parent_tidptr,
40 void *new_tls,
41 int *child_tidptr,
42 int (*fn)(void *),
43 void *arg);
44
45 extern void _exit_thread(int retCode);
46
47 /* this function is called from the __bionic_clone
48 * assembly fragment to call the thread function
49 * then exit. */
50 extern void
__bionic_clone_entry(int (* fn)(void *),void * arg)51 __bionic_clone_entry( int (*fn)(void *), void *arg )
52 {
53 int ret = (*fn)(arg);
54 _exit_thread(ret);
55 }
56
57 int
clone(int (* fn)(void *),void * child_stack,int flags,void * arg,...)58 clone(int (*fn)(void *), void *child_stack, int flags, void* arg, ...)
59 {
60 va_list args;
61 int *parent_tidptr = NULL;
62 void *new_tls = NULL;
63 int *child_tidptr = NULL;
64 int ret;
65
66 /* extract optional parameters - they are cummulative */
67 va_start(args, arg);
68 if (flags & (CLONE_PARENT_SETTID|CLONE_SETTLS|CLONE_CHILD_SETTID)) {
69 parent_tidptr = va_arg(args, int*);
70 }
71 if (flags & (CLONE_SETTLS|CLONE_CHILD_SETTID)) {
72 new_tls = va_arg(args, void*);
73 }
74 if (flags & CLONE_CHILD_SETTID) {
75 child_tidptr = va_arg(args, int*);
76 }
77 va_end(args);
78
79 ret = __bionic_clone(flags, child_stack, parent_tidptr, new_tls, child_tidptr, fn, arg);
80 return ret;
81 }
82