Error Found When Createmutex Access Denied
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denied” up vote 2 down vote favorite 1 The following code works without any problem sometimes and at other times it throws "Access is denied" error. The behavior is not consistent. _hMutex = CreateMutex(NULL, FALSE, MutexName); if (_hMutex == NULL) { throw MY_ERROR(GetLastError(), L"Error creating mutex handle"); } I run my standalone executable which has this code, do the operation and exit. It is not a multithreaded application. I logon with the same user credential every time I run this. Could you help me resolve this? Thanks, Hem c++ windows share|improve this question edited Apr 13 '12 at 11:59 asked Apr 13 '12 at 11:27 Hem 97213 2 "It is not a multithreaded application", Why do you need an Mutex if that be the case? –Alok Save Apr 13 '12 at 11:29 Why did you tag your question multithreading if it's not multithreaded? –Marco Apr 13 '12 at 11:30 1 @Als: Based on the fact that OP is trying to create a named mutex, I'd say that there are multiple processes trying to share a resource that is protected by a mutex. The fact that the OP's executable is not multithreaded is probably irrelevant here. –Gabe Apr 13 '12 at 11:33 What is MutexName? –Gabe Apr 13 '12 at 11:33 @Gabe: We could actually guess anything what we chose to, but that really wouldn't serve the cause of solving the problem conclusively.If one needs accurate answers and not mere guesses then they need to provide accurate details not vague worded qu
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was created by a service. It uses the following call: handle = CreateMutex (NULL, FALSE, MUTEX_NAME); My understanding is that this creates http://www.verycomputer.com/5_d1f479a35b34cbc1_1.htm the mutex or returns a handle to the existing named mutex (which http://www.busydevelopers.com/article/41639686/CreateMutex()+--+access+denied is what the code is intended to do). A problem arises when the service is running and holding ownership of the mutex. In my second, non-service application the CreateMutex () call sometimes fails with an "Access is denied" error (note I am not attempting to get ownership, but just a mutex error found handle). This happens frequently, but not always under Windows NT 4.0 SP6, while logged in as an administrator (and _not_ in a terminal services session, by the way, in case you are thinking along that line) and the service is running in the local system account. It does not happen if both applications are running as a service or both are not running error found when as a service. It so far also has not happened on one Win2k machine I tried. Any ideas? Top CreateMutex () fails with "Access is denied" by Ivan Brugiolo [MSFT » Fri, 25 Apr 2003 03:25:43 Do you specify a security descriptor when you create the mutex in the first place ? Calling CreateMutex() on a named mutex, when the mutes already exists, is equvalent to call OpenMutex(MUTEX_ALL_ACCESS). The default security descriptor for the named object may not grant ALL access to the user account from which you are attempting the open. The "same user" case naturally works, because the owner is checked before the DACL. -- This posting is provided "AS IS" with no warranties, and confers no rights. Use of any included script samples are subject to the terms specified at http://www.microsoft.com/info/cpyright.htm Quote:> Hello, > My program needs to obtain a handle to a named mutex, which was created by a > service. It uses the following call: > handle = CreateMutex (NULL, FALSE, MUTEX_NAME); > My understanding is that this creates the mutex or returns a handle to the > exis
FALSE, MutexName); The call works absolutely fine sometimes. The behavior is not consistent. MSDN documentation says that the error thrown when user had limited access rights? What should be user rights here? I use a domain account that had admin privileges? 2. Also, the MSDN documentation says "If the lpMutexAttributes parameter is not NULL, it determines whether the handle can be inherited, but its security-descriptor member is ignored.". How do I specify security descriptor in createmutex call? Why is synchronize option that is available for openmutex() is not available for createmutex()? Am I getting anything fundamentally wrong here? Thanks. 1 CreateMutex=OpenMutex if the name is used, from the documentation: If lpName matches the name of an existing named mutex object, this function requests the MUTEX_ALL_ACCESS access right. Looks like you don't have all access to the mutex. Change the security descriptor at the time of creation to allow the user token of your current process to have full access on the object. 2 you are quoting the sentences after "If lpName matches the name of an existing named mutex object". The security descriptor is set by the creator when there isn't a name match. see the documentation of lpMutexAttributes. The following is signature, not part of post Please mark the post answered your question as the answer, and mark other helpful posts as helpful, so they will appear differently to other users who are visiting your thread for the same problem. Visual C++ MVP Thanks for the reply. On the first one, could you let me know what should be my security descriptor, so that other process can use it? What special permission does the username I'm using needs to be granted? Thanks. The easiest way is to use SDDL then call ConvertStringSecurityDescriptorToSec