From: "rutsky (Vladimir Rutsky)" <rutsky.vladimir@...>
Date: 2013-03-14T20:26:34+09:00
Subject: [ruby-core:53406] [ruby-trunk - Feature #8083] Exit status is limited to one-byte values which is invalid for Windows


Issue #8083 has been updated by rutsky (Vladimir Rutsky).


=begin
I cannot find exact definition of possible exit codes on Windows, but here is ExitProcess function declaration [1]:

 VOID WINAPI ExitProcess(
   _In_  UINT uExitCode
 );

UINT type definition [2]:

 An unsigned INT. The range is 0 through 4294967295 decimal.

GetExitCodeProcess declaration [3] (looks like it used in CRuby to get exit status):

 BOOL WINAPI GetExitCodeProcess(
  _In_   HANDLE hProcess,
  _Out_  LPDWORD lpExitCode
 );

LPDWORD type definition [4]:

 typedef DWORD *LPDWORD;

DWORD type definition [5]:

 A 32-bit unsigned integer. The range is 0 through 4294967295 decimal.

Not sure about all Windows platforms, but at least on Windows 7 error codes in full 32-bit range can be retrieved in practice:

 C:\Python27>python.exe -c "import ctypes, ctypes.wintypes; ctypes.windll.kernel32.ExitProcess(ctypes.wintypes.UINT(30))"

 C:\Python27>echo %errorlevel%
 30

 C:\Python27>python.exe -c "import ctypes, ctypes.wintypes; ctypes.windll.kernel32.ExitProcess(ctypes.wintypes.UINT(2**31 - 1))"

 C:\Python27>echo %errorlevel%
 2147483647

 C:\Python27>python.exe -c "import ctypes, ctypes.wintypes; ctypes.windll.kernel32.ExitProcess(ctypes.wintypes.UINT(2**31))"

 C:\Python27>echo %errorlevel%
 -2147483648

 C:\Python27>python.exe -c "import ctypes, ctypes.wintypes; ctypes.windll.kernel32.ExitProcess(ctypes.wintypes.UINT(2**32 - 1))"

 C:\Python27>echo %errorlevel%
 -1


[1] http://msdn.microsoft.com/en-us/library/windows/desktop/ms682658%28v=vs.85%29.aspx

[2] http://msdn.microsoft.com/en-us/library/windows/desktop/aa383751%28v=vs.85%29.aspx#UINT

[3] http://msdn.microsoft.com/en-us/library/windows/desktop/ms683189%28v=vs.85%29.aspx

[4] http://msdn.microsoft.com/en-us/library/windows/desktop/aa383751%28v=vs.85%29.aspx#LPDWORD

[5] http://msdn.microsoft.com/en-us/library/windows/desktop/aa383751%28v=vs.85%29.aspx#DWORD
=end

----------------------------------------
Feature #8083: Exit status is limited to one-byte values which is invalid for Windows
https://bugs.ruby-lang.org/issues/8083#change-37597

Author: rutsky (Vladimir Rutsky)
Status: Assigned
Priority: Normal
Assignee: cruby-windows
Category: platform/windows
Target version: 


=begin
Windows uses 32-bit process exit codes so Ruby incorrectly truncates them to one byte:

 C:\Ruby193\bin>ruby -e "system('C:\windows\system32\cmd.exe /c exit 255'); puts $?.exitstatus"
 255

 C:\Ruby193\bin>ruby -e "system('C:\windows\system32\cmd.exe /c exit 256'); puts $?.exitstatus"
 0

 C:\Ruby193\bin>ruby -e "system('C:\windows\system32\cmd.exe /c exit 257'); puts $?.exitstatus"
 1


Similar code works correctly in Python:

 C:\Python27>python -c "import subprocess; print subprocess.call('C:\windows\system32\cmd.exe /c exit 255')"
 255

 C:\Python27>python -c "import subprocess; print subprocess.call('C:\windows\system32\cmd.exe /c exit 256')"
 256

 C:\Python27>python -c "import subprocess; print subprocess.call('C:\windows\system32\cmd.exe /c exit 257')"
 257
=end



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