QueryServiceLockStatus

The QueryServiceLockStatus function retrieves the lock status of the specified service control manager database.

BOOL QueryServiceLockStatus(

SC_HANDLE hSCManager,	// handle of svc. ctrl. mgr. database
LPQUERY_SERVICE_LOCK_STATUS lpLockStatus,	// address of lock status structure
DWORD cbBufSize,	// size of service configuration buffer
LPDWORD pcbBytesNeeded	// address of variable for bytes needed
);

Parameters

hSCManager

Identifies the service control manager database. The OpenSCManager function returns this handle, which must have SC_MANAGER_QUERY_LOCK_STATUS access.

lpLockStatus

Points to a QUERY_SERVICE_LOCK_STATUS structure in which the lock status of the specified database is returned.

cbBufSize

Specifies the size, in bytes, of the buffer pointed to by the lpLockStatus parameter.

pcbBytesNeeded

Points to a variable that receives the number of bytes needed to return all the lock status information.

Return Values

If the function succeeds, the return value is nonzero.

If the function fails, the return value is zero. To get extended error information, call GetLastError.

Errors

The following error codes may be set by the service control manager. Other error codes may be set by the registry functions that are called by the service control manager.

Value

Meaning

ERROR_ACCESS_DENIED

The specified handle was not opened with SC_MANAGER_QUERY_LOCK_STATUS access.

ERROR_INSUFFICIENT_BUFFER

There is more lock status information than would fit into the lpLockStatus buffer. The number of bytes required to get all the information is returned in the pcbBytesNeeded parameter. Nothing is written to the lpLockStatus buffer.

ERROR_INVALID_HANDLE

The specified handle is invalid.

Remarks

The QueryServiceLockStatus function returns a QUERY_SERVICE_LOCK_STATUS structure that indicates whether the specified database is locked. If the database is locked, the structure provides the account name of the user that holds the lock and the length of time that the lock has been held.

A process calls the LockServiceDatabase function to lock a service control manager database and the UnlockServiceDatabase function to release the lock.

The lpLockStatus buffer must be large enough to hold the string pointed to by the lpLockOwner member of the QUERY_SERVICE_LOCK_STATUS structure.

See Also

LockServiceDatabase, OpenSCManager, QUERY_SERVICE_LOCK_STATUS, UnlockServiceDatabase

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