1 #include <sched.h>
2 #include <signal.h>
3 #include <lib9.h>
4 
5 int fforkstacksize = 16384;
6 
7 int
8 ffork(int flags, void (*fn)(void*), void *arg)
9 {
10 	char *p;
11 	int cloneflag, pid;
12 
13 	p = malloc(fforkstacksize);
14 	if(p == nil)
15 		return -1;
16 	cloneflag = 0;
17 	flags &= ~RFPROC;
18 	if(flags&RFMEM){
19 		cloneflag |= CLONE_VM;
20 		flags &= ~RFMEM;
21 	}
22 	if(!(flags&RFFDG))
23 		cloneflag |= CLONE_FILES;
24 	else
25 		flags &= ~RFFDG;
26 	if(!(flags&RFNOWAIT))
27 		cloneflag |= SIGCHLD;
28 	else
29 		flags &= ~RFNOWAIT;
30 	if(flags){
31 		fprint(2, "unknown rfork flags %x\n", flags);
32 		return -1;
33 	}
34 	pid = clone((int(*)(void*))fn, p+fforkstacksize-16, cloneflag, arg);
35 	if(pid < 0)
36 		free(p);
37 	return pid;
38 }
39 
40 int
41 getfforkid(void)
42 {
43 	return getpid();
44 }
45