ref: 42bdc44ec9bbdd4054fb242a9f3c204652cadc73
dir: /proc.c/
static int
p9_rfork(lua_State *L)
{
lua_Integer flags;
int r;
flags = luaL_checkinteger(L, 1);
if((r = rfork(flags)) == -1)
lerror(L, "rfork");
lua_pushinteger(L, r);
return 1;
}