libgo/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 <stdint.h>
  11 #include <dlfcn.h>
  12 #cgo linux LDFLAGS: -ldl
  13
  14 extern uintptr_t dlopen4029(char*, int);
  15 extern uintptr_t dlsym4029(uintptr_t, char*);
  16 extern int dlclose4029(uintptr_t);
  17
  18 extern void call4029(uintptr_t arg);
  19 */
  20 import "C"
  21
  22 import (
  23         "testing"
  24 )
  25
  26 var callbacks int
  27
  28 //export IMPIsOpaque
  29 func IMPIsOpaque() {
  30         callbacks++
  31 }
  32
  33 //export IMPInitWithFrame
  34 func IMPInitWithFrame() {
  35         callbacks++
  36 }
  37
  38 //export IMPDrawRect
  39 func IMPDrawRect() {
  40         callbacks++
  41 }
  42
  43 //export IMPWindowResize
  44 func IMPWindowResize() {
  45         callbacks++
  46 }
  47
  48 func test4029(t *testing.T) {
  49         loadThySelf(t, "IMPWindowResize")
  50         loadThySelf(t, "IMPDrawRect")
  51         loadThySelf(t, "IMPInitWithFrame")
  52         loadThySelf(t, "IMPIsOpaque")
  53         if callbacks != 4 {
  54                 t.Errorf("got %d callbacks, expected 4", callbacks)
  55         }
  56 }
  57
  58 func loadThySelf(t *testing.T, symbol string) {
  59         this_process := C.dlopen4029(nil, C.RTLD_NOW)
  60         if this_process == 0 {
  61                 t.Error("dlopen:", C.GoString(C.dlerror()))
  62                 return
  63         }
  64         defer C.dlclose4029(this_process)
  65
  66         symbol_address := C.dlsym4029(this_process, C.CString(symbol))
  67         if symbol_address == 0 {
  68                 t.Error("dlsym:", C.GoString(C.dlerror()))
  69                 return
  70         }
  71         t.Log(symbol, symbol_address)
  72         C.call4029(symbol_address)
  73 }