1 #include <unistd.h>
2 #include <signal.h>
3 #include "syscall.h"
4 #include "libc.h"
5 #include "lock.h"
6 #include "pthread_impl.h"
7 #include "aio_impl.h"
8 
dummy(int x)9 static void dummy(int x) { }
10 weak_alias(dummy, __aio_atfork);
11 
_Fork(void)12 pid_t _Fork(void)
13 {
14 	pid_t ret;
15 	sigset_t set;
16 	__block_all_sigs(&set);
17 	__aio_atfork(-1);
18 	LOCK(__abort_lock);
19 #ifdef SYS_fork
20 	ret = __syscall(SYS_fork);
21 #else
22 	ret = __syscall(SYS_clone, SIGCHLD, 0);
23 #endif
24 	if (!ret) {
25 		pthread_t self = __pthread_self();
26 		self->tid = __syscall(SYS_gettid);
27 		self->robust_list.off = 0;
28 		self->robust_list.pending = 0;
29 		self->next = self->prev = self;
30 		__thread_list_lock = 0;
31 		libc.threads_minus_1 = 0;
32 		if (libc.need_locks) libc.need_locks = -1;
33 	}
34 	UNLOCK(__abort_lock);
35 	__aio_atfork(!ret);
36 	__restore_sigs(&set);
37 	return __syscall_ret(ret);
38 }
39