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From:	"Lavrentiev, Anton (NIH/NLM/NCBI) [C]" <lavr AT ncbi DOT nlm DOT nih DOT gov>
To:	"cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
Subject:	Cygwin kill utility //Was: cgwin_internal(): difference b/w CW_CYGWIN_PID_TO_WINPID and CW_GETPINFO_FULL for taking only dwProcessId ?
Date:	Tue, 8 Apr 2014 03:01:18 +0000
Message-ID:	<5F8AAC04F9616747BC4CC0E803D5907D0C8AED9C@MLBXv04.nih.gov>
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Hello,

It looks like in order to effectively kill the process by Windows means (i.e. what Cygwin "kill -f" is supposed to do),
the process handle must be obtained with the SYNCHRONIZE right (in addition to PROCESS_TERMINATE), otherwise
WaitForSingleObject() fails with code 5, permission denied (at least for a regular user, i.e. not an administrator).

That's about this portion of kill.cc located at winsup\utils:

  HANDLE h = OpenProcess (PROCESS_TERMINATE, FALSE, (DWORD) dwpid);
  if (!h)
    {
      if (!wait || GetLastError () != ERROR_INVALID_PARAMETER)
	fprintf (stderr, "%s: couldn't open pid %u\n",
		 prog_name, (unsigned) dwpid);
      return;
    }
  if (!wait || WaitForSingleObject (h, 200) != WAIT_OBJECT_0)
    if (sig && !TerminateProcess (h, sig << 8)
	&& WaitForSingleObject (h, 200) != WAIT_OBJECT_0)
      fprintf (stderr, "%s: couldn't kill pid %u, %lu\n",
	       prog_name, (unsigned) dwpid, GetLastError ());

MSDN is in agreement with the observed behavior (access denied),

http://msdn.microsoft.com/en-us/library/windows/desktop/ms684320%28v=vs.85%29.aspx

<quote>
The handle returned by the OpenProcess function can be used in any function that requires a handle to a process, such as the wait functions, provided the appropriate access rights were requested.
</quote>

http://msdn.microsoft.com/en-us/library/windows/desktop/ms684880%28v=vs.85%29.aspx

HTH,

Anton Lavrentiev
Contractor NIH/NLM/NCBI

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