1 /*
2 * Copyright (C) 2008 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 #include <unistd.h>
29 #include "pthread_internal.h"
30 #include "bionic_pthread.h"
31 #include "cpuacct.h"
32
33 extern int __fork(void);
34
fork(void)35 int fork(void)
36 {
37 int ret;
38
39 /* Posix mandates that the timers of a fork child process be
40 * disarmed, but not destroyed. To avoid a race condition, we're
41 * going to stop all timers now, and only re-start them in case
42 * of error, or in the parent process
43 */
44 __timer_table_start_stop(1);
45 __bionic_atfork_run_prepare();
46
47 ret = __fork();
48 if (ret != 0) { /* not a child process */
49 __timer_table_start_stop(0);
50 __bionic_atfork_run_parent();
51 } else {
52 // Fix the tid in the pthread_internal_t struct after a fork.
53 __pthread_settid(pthread_self(), gettid());
54
55 /*
56 * Newly created process must update cpu accounting.
57 * Call cpuacct_add passing in our uid, which will take
58 * the current task id and add it to the uid group passed
59 * as a parameter.
60 */
61 cpuacct_add(getuid());
62 __bionic_atfork_run_child();
63 }
64 return ret;
65 }
66