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 #include "proc_xid_impl.h"
9 
dummy(int x)10 static void dummy(int x) { }
11 weak_alias(dummy, __aio_atfork);
12 
_Fork(void)13 pid_t _Fork(void)
14 {
15 	pid_t ret;
16 	sigset_t set;
17 	__block_all_sigs(&set);
18 	__aio_atfork(-1);
19 	LOCK(__abort_lock);
20 #ifdef SYS_fork
21 	ret = __syscall(SYS_fork);
22 #else
23 	ret = __syscall(SYS_clone, SIGCHLD, 0);
24 #endif
25 	if (!ret) {
26 		pthread_t self = __pthread_self();
27 		self->tid = __syscall(SYS_gettid);
28 		self->pid = self->tid;
29 		self->proc_tid = -1;
30 		self->robust_list.off = 0;
31 		self->robust_list.pending = 0;
32 		self->next = self->prev = self;
33 		__thread_list_lock = 0;
34 		libc.threads_minus_1 = 0;
35 		__clear_proc_pid();
36 		if (libc.need_locks) libc.need_locks = -1;
37 	}
38 	UNLOCK(__abort_lock);
39 	__aio_atfork(!ret);
40 	__restore_sigs(&set);
41 	return __syscall_ret(ret);
42 }
43