[Bug 1142] ms office2k file lock

[Wine Bugs]

http://bugs.winehq.org/show_bug.cgi?id=1142





------- Additional Comments From wine at deesconsulting.com  2004-12-10 12:10 -------
Upon further investigation, this is what I have found: 
 
The main function for opening/creating files in Windows is NtCreateFile(). 
This function calls SERVER_START_REQ( create_file ) which tells the wine 
server to open/create a file. 
The function DECL_HANDLER(create_file) handles this request in the wine server 
by calling the create_file() function. 
create_file() calls open_fd(). 
open_fd() calls check_sharing(). 
 
check_sharing() seems to be the broken function in question.  From a cursory 
investigation, this function seems to only check for cached file locks within 
the wine environment.  check_sharing() does not call fcntl() to check for 
filesystem locks in Linux.  Thus, locks set by the wine server with lock_fd() 
upon calling NtLockFile() are not checked upon file open. 
 
Based on my previous post, I'm assuming that Windows normally enforces 
mandatory file locking upon opening a file with NtCreateFile().  This 
assumption could be wrong, but it explains the behaviour seen and seems to be 
backed up. 
 
Now the question becomes "what error/status should the wine server return to 
the program upon opening a locked file?" 

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