Go Exception "signal arrived during cgo execution"

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英文:

Go Exception "signal arrived during cgo execution"

问题

在调用dll时，Go会在什么情况下出现类似"在cgo执行期间收到信号"的panic？

要调用的代码是基于Go发行版中src目录下的zsyscall_windows.go中的示例：

  1. var (
  2.     // 使用dumpbin /exports找到的入口名称
  3.     dllSweph = syscall.NewLazyDLL("swedll32.dll")
  5.     _swe_jdut1_to_utc = dllSweph.NewProc("_swe_jdut1_to_utc@36")
  6.     _swe_julday       = dllSweph.NewProc("_swe_julday@24")
  7. )
  9. func swe_julday(year, month, day int32, hour float64, gregflag int32) float64 {
  10.     r, _, errn := syscall.Syscall6(
  11.         _swe_julday.Addr(),
  12.         5,
  13.         uintptr(year),
  14.         uintptr(month),
  15.         uintptr(day),
  16.         uintptr(hour),
  17.         uintptr(gregflag),
  18.         0)
  20.     if r == 0 {
  21.         if errn != 0 {
  22.             panic(error(errn))
  23.         }
  24.     }
  26.     return float64(r)
  27. }
  29. func swe_jdut1_to_utc(tjd_ut float64, gregflag int32, iyear, imonth, iday, ihour, imin *int32, dsec *float64) {
  30.     defer func() {
  31.         if e := recover(); e != nil {
  32.         }
  33.     }()
  35.     syscall.Syscall9(
  36.         _swe_jdut1_to_utc.Addr(),
  37.         8,
  38.         uintptr(tjd_ut),
  39.         uintptr(gregflag),
  40.         uintptr(unsafe.Pointer(iyear)),
  41.         uintptr(unsafe.Pointer(imonth)),
  42.         uintptr(unsafe.Pointer(iday)),
  43.         uintptr(unsafe.Pointer(ihour)),
  44.         uintptr(unsafe.Pointer(imin)),
  45.         uintptr(unsafe.Pointer(dsec)),
  46.         0)
  47. }

现在当我调用swe_julday时，一切似乎都很正常，尽管实际上并不是这样，它给出了一个错误的答案。而当调用swe_jdut1_to_utc时，我得到了以下错误：

  1. Exception 0xc0000005 0x1 0x42e5e5 0x3235ce40
  2. PC=0x3235ce40
  3. signal arrived during cgo execution
  5. .../sweph.swe_jdut1_to_utc(0x40000000, 0x4150b979, 0x1, 0x1207bf24, 0x1207bf28, 0x1207bf34, 0x1207bf30, 0x1207bf2c, 0x1207bf38)
  6. ...(trace info)
  8. eax     0x0
  9. ebx     0x1207be94
  10. ecx     0x1207bf38
  11. edx     0x42e5e5
  12. edi     0xcfeac
  13. esi     0x0
  14. ebp     0xcfe5c
  15. esp     0xcfdd8
  16. eip     0x3235ce40
  17. eflags  0x10246
  18. cs      0x23
  19. fs      0x53
  20. gs      0x2b
  21. exit status 2
  23. exit status 1

环境：

  • Windows 8 x64
  • Go 1.4 x86
  • GCC x86

我不知道是否真的需要gcc来调用一个dll，但我已经安装了它，因为错误是关于cgo的。所有命令都在路径中。使用管理员权限编译时出现相同的错误。

被调用的C函数是：

  1. void swe_jdut1_to_utc (double tjd_ut, int32 gregflag, int32 *iyear, int32 *imonth, int32 *iday, int32 *ihour, int32 *imin, double *dsec)

而在该dll中导入并调用此函数的C#函数是：

  1. [DllImport("swedll32.dll", EntryPoint = "swe_jdut1_to_utc")]
  2. public static extern void swe_jdut1_to_utc(
  3.     double tjd_ut,
  4.     int gregflag,
  5.     ref Int32 iyear, ref Int32 imonth, ref Int32 iday,
  6.     ref Int32 ihour, ref Int32 imin, ref double dsec);
英文:

In what circumstances Go panics like "signal arrived during cgo execution" when calling a dll?

The code to be called is - based on samples in zsyscall_windows.go in src of go distribution:

  1. var (
  2.     // entry names found using dumpbin /exports
  3. 	dllSweph = syscall.NewLazyDLL("swedll32.dll")
  5.     _swe_jdut1_to_utc = dllSweph.NewProc("_swe_jdut1_to_utc@36")
  6.     _swe_julday       = dllSweph.NewProc("_swe_julday@24")
  7. )
  9. func swe_julday(year, month, day int32, hour float64, gregflag int32) float64 {
  10. 	r, _, errn := syscall.Syscall6(
  11. 		_swe_julday.Addr(),
  12. 		5,
  13. 		uintptr(year),
  14. 		uintptr(month),
  15. 		uintptr(day),
  16. 		uintptr(hour),
  17. 		uintptr(gregflag),
  18. 		0)
  20. 	if r == 0 {
  21. 		if errn != 0 {
  22. 			panic(error(errn))
  23. 		}
  24. 	}
  26. 	return float64(r)
  27. }
  29. func swe_jdut1_to_utc(tjd_ut float64, gregflag int32, iyear, imonth, iday, ihour, imin *int32, dsec *float64) {
  30. 	defer func() {
  31. 		if e := recover(); e != nil {
  32. 		}
  33. 	}()
  35. 	syscall.Syscall9(
  36. 		_swe_jdut1_to_utc.Addr(),
  37. 		8,
  38. 		uintptr(tjd_ut),
  39. 		uintptr(gregflag),
  40. 		uintptr(unsafe.Pointer(iyear)),
  41. 		uintptr(unsafe.Pointer(imonth)),
  42. 		uintptr(unsafe.Pointer(iday)),
  43. 		uintptr(unsafe.Pointer(ihour)),
  44. 		uintptr(unsafe.Pointer(imin)),
  45. 		uintptr(unsafe.Pointer(dsec)),
  46. 		0)
  47. }

Now when I call swe_julday everything seems to be fine; although it's not and it gives a wrong answer. And when swe_jdut1_to_utc is called, I get:

  1. Exception 0xc0000005 0x1 0x42e5e5 0x3235ce40
  2. PC=0x3235ce40
  3. signal arrived during cgo execution
  5. .../sweph.swe_jdut1_to_utc(0x40000000, 0x4150b979, 0x1, 0x1207bf24, 0x1207bf28, 0x1207bf34, 0x1207bf30, 0x1207bf2c, 0x1207bf38)
  6. ...(trace info)
  8. eax     0x0
  9. ebx     0x1207be94
  10. ecx     0x1207bf38
  11. edx     0x42e5e5
  12. edi     0xcfeac
  13. esi     0x0
  14. ebp     0xcfe5c
  15. esp     0xcfdd8
  16. eip     0x3235ce40
  17. eflags  0x10246
  18. cs      0x23
  19. fs      0x53
  20. gs      0x2b
  21. exit status 2
  23. exit status 1

Environment:

  1. Windows 8 x64
  2. go 1.4    x86
  3. gcc       x86

And I do not know if gcc is really needed to just call a dll, but I've installed it any way because the error was about cgo. All commands are in the path. Same error when compiling with administrative privileges.

The C function that is being called is:

  1. void swe_jdut1_to_utc (double tjd_ut, int32 gregflag, int32 *iyear, int32 *imonth, int32 *iday, int32 *ihour, int32 *imin, double *dsec)

And the C# function which imports and calls this function in that dll (& works) is:

  1. [DllImport("swedll32.dll", EntryPoint = "swe_jdut1_to_utc")]
  2. public static extern void swe_jdut1_to_utc(
  3.     double tjd_ut,
  4.     int gregflag,
  5.     ref Int32 iyear, ref Int32 imonth, ref Int32 iday,
  6.     ref Int32 ihour, ref Int32 imin, ref double dsec);

答案1

得分: 1

我成功构建了一个使用swe_julday函数的Delphi应用程序。不幸的是，我发现它使用fstp汇编指令来获取swe_julday返回的结果。Go的syscall.Syscall不支持这个功能。很抱歉，你运气不好。我认为你最好的选择是如果可能的话，使用CGO来使用mingw编译器构建你的库。抱歉。

英文:

I managed to build delphi app that uses swe_julday function. Unfortunately I can see it uses fstp asm instruction to retrieve result returned by swe_julday. Go's syscall.Syscall does not support this functionality. You are our of luck. I think your best bet is to use CGO if it is possible to build your library with mingw compiler. Sorry

Alex

huangapple
  • 本文由 发表于 2014年12月29日 06:10:41
  • 转载请务必保留本文链接：https://go.coder-hub.com/27681094.html
  • cgo
  • dll
  • ffi
  • go
  • windows
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