ref: 3654451f1948e59b1f99d7bb6efb1283714d246d
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;
}