misc/cgo/test/issue4029.go

   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 // +build !windows
   6
   7 package cgotest
   8
   9 /*
  10 #include <dlfcn.h>
  11 #cgo linux LDFLAGS: -ldl
  12
  13 extern void call4029(void *arg);
  14 */
  15 import "C"
  16
  17 import (
  18         "testing"
  19 )
  20
  21 var callbacks int
  22
  23 //export IMPIsOpaque
  24 func IMPIsOpaque() {
  25         callbacks++
  26 }
  27
  28 //export IMPInitWithFrame
  29 func IMPInitWithFrame() {
  30         callbacks++
  31 }
  32
  33 //export IMPDrawRect
  34 func IMPDrawRect() {
  35         callbacks++
  36 }
  37
  38 //export IMPWindowResize
  39 func IMPWindowResize() {
  40         callbacks++
  41 }
  42
  43 func test4029(t *testing.T) {
  44         loadThySelf(t, "IMPWindowResize")
  45         loadThySelf(t, "IMPDrawRect")
  46         loadThySelf(t, "IMPInitWithFrame")
  47         loadThySelf(t, "IMPIsOpaque")
  48         if callbacks != 4 {
  49                 t.Errorf("got %d callbacks, expected 4", callbacks)
  50         }
  51 }
  52
  53 func loadThySelf(t *testing.T, symbol string) {
  54         this_process := C.dlopen(nil, C.RTLD_NOW)
  55         if this_process == nil {
  56                 t.Error("dlopen:", C.GoString(C.dlerror()))
  57                 return
  58         }
  59         defer C.dlclose(this_process)
  60
  61         symbol_address := C.dlsym(this_process, C.CString(symbol))
  62         if symbol_address == nil {
  63                 t.Error("dlsym:", C.GoString(C.dlerror()))
  64                 return
  65         }
  66         t.Log(symbol, symbol_address)
  67         C.call4029(symbol_address)
  68 }