X-Recipient: archive-cygwin AT delorie DOT com
DomainKey-Signature: a=rsa-sha1; c=nofws; d=sourceware.org; h=list-id
	:list-unsubscribe:list-subscribe:list-archive:list-post
	:list-help:sender:from:to:subject:date:message-id:content-type
	:content-transfer-encoding:mime-version; q=dns; s=default; b=ttg
	Xr7fYUvaHFfgLKvpavViw8Shw8ssS902dwrBr+SAwewlVCAHSLooSEXaZtLHJpNG
	qb+fdqFbujSfk9fX8StWcq8N/Hwm0+zWxyLpbofUsg3aBN6JHqeXKp2ycye0POmS
	VsIPwT/0PL8v5e82+xS66nYWt5eigMDT8G+cYxls=
DKIM-Signature: v=1; a=rsa-sha1; c=relaxed; d=sourceware.org; h=list-id
	:list-unsubscribe:list-subscribe:list-archive:list-post
	:list-help:sender:from:to:subject:date:message-id:content-type
	:content-transfer-encoding:mime-version; s=default; bh=et7B6tfQG
	mAZYEa3kg14VBPkZ2k=; b=Y/kGwLqMVYIi7EvUGdw55qddMrBKAdDudNVZKEryn
	ASDzM1hlXMkrqv+IXxAo+XbZQSggV5rR5OkOEQXr1tBXW4YGfyf6lVWfFrU25c2+
	dmQWFNZ72dqfGwzXVdTFRDtCMupUtXmyXdZ1imSEL9aPWUU9VTgHS3uJQhB8VuEl
	wI=
Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Id: <cygwin.cygwin.com>
List-Subscribe: <mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive: <http://sourceware.org/ml/cygwin/>
List-Post: <mailto:cygwin AT cygwin DOT com>
List-Help: <mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/ml/#faqs>
Sender: cygwin-owner AT cygwin DOT com
Mail-Followup-To: cygwin AT cygwin DOT com
Delivered-To: mailing list cygwin AT cygwin DOT com
Authentication-Results: sourceware.org; auth=none
X-Virus-Found: No
X-Spam-SWARE-Status: No, score=-1.5 required=5.0 tests=AWL,BAYES_00,MIME_BASE64_BLANKS,RP_MATCHES_RCVD,SPF_HELO_PASS,SPF_PASS autolearn=ham version=3.3.2
X-HELO: nihxway2out.hub.nih.gov
X-IronPortListener: Outbound_SMTP
X-IronPort-Anti-Spam-Filtered: true
X-IronPort-Anti-Spam-Result: AhwFAIxlQ1OcKEe0/2dsb2JhbABZgwY7V4MKuWiGZlEZgQgWdIInAQQSERFXARUNAgYZBwIEHRMVAgEOAQQbGodXDZlRhHqKIqIuF4EpgTSLXIJmDzI1gRQEjwOFbYUghUaDZ4dfgXGBP4Ir
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>
Content-Type: text/plain; charset="utf-8"
MIME-Version: 1.0
X-IsSubscribed: yes
Content-Transfer-Encoding: 8bit
X-MIME-Autoconverted: from base64 to 8bit by delorie.com id s3831cmk015338

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