1// Copyright 2012 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5// Issue 3729:	cmd/cgo: access errno from void C function
6// void f(void) returns [0]byte, error in Go world.
7
8// +build !windows
9
10package cgotest
11
12/*
13#include <errno.h>
14
15void g(void) {
16	errno = E2BIG;
17}
18
19// try to pass some non-trivial arguments to function g2
20const char _expA = 0x42;
21const float _expB = 3.14159;
22const short _expC = 0x55aa;
23const int _expD = 0xdeadbeef;
24void g2(int x, char a, float b, short c, int d) {
25	if (a == _expA && b == _expB && c == _expC && d == _expD)
26		errno = x;
27	else
28		errno = -1;
29}
30*/
31import "C"
32
33import (
34	"syscall"
35	"testing"
36)
37
38func test3729(t *testing.T) {
39	_, e := C.g()
40	if e != syscall.E2BIG {
41		t.Errorf("got %q, expect %q", e, syscall.E2BIG)
42	}
43	_, e = C.g2(C.EINVAL, C._expA, C._expB, C._expC, C._expD)
44	if e != syscall.EINVAL {
45		t.Errorf("got %q, expect %q", e, syscall.EINVAL)
46	}
47}
48