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-rw-r--r--misc/cgo/test/issue3729.go47
1 files changed, 47 insertions, 0 deletions
diff --git a/misc/cgo/test/issue3729.go b/misc/cgo/test/issue3729.go
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+// Copyright 2012 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Issue 3729: cmd/cgo: access errno from void C function
+// void f(void) returns [0]byte, error in Go world.
+
+// +build !windows
+
+package cgotest
+
+/*
+#include <errno.h>
+
+void g(void) {
+ errno = E2BIG;
+}
+
+// try to pass some non-trivial arguments to function g2
+const char _expA = 0x42;
+const float _expB = 3.14159;
+const short _expC = 0x55aa;
+const int _expD = 0xdeadbeef;
+void g2(int x, char a, float b, short c, int d) {
+ if (a == _expA && b == _expB && c == _expC && d == _expD)
+ errno = x;
+ else
+ errno = -1;
+}
+*/
+import "C"
+
+import (
+ "syscall"
+ "testing"
+)
+
+func test3729(t *testing.T) {
+ _, e := C.g()
+ if e != syscall.E2BIG {
+ t.Errorf("got %q, expect %q", e, syscall.E2BIG)
+ }
+ _, e = C.g2(C.EINVAL, C._expA, C._expB, C._expC, C._expD)
+ if e != syscall.EINVAL {
+ t.Errorf("got %q, expect %q", e, syscall.EINVAL)
+ }
+}