Hello, In Samba-Developers-Guide, in chapter Deny Modes, is written : "When a SMB clien opens a file it asks for a particular "deny mode" to be placed on the file. These modes (DENY_NONE, DENY_READ, DENY_WRITE, DENY_ALL, DENY_FCB and DENY_DOS) specify what actions should be allowed by anyone else who tries to use the file at the same time. ...". My clients are Linux Red Hat 7.3 PC. My server too. I use smbmount to mount samba shares on my clients. My question is : how can I choose the deny mode above when I open a file ? smb_open doesn't seem to take it as a parameter. Neither smbmount. I didn't see any smb.conf parameter look like that. I'd just like to have locks on my files when I open them by C function fopen from a Linux client. Thank you for your help Fred PS : I have read Samba How-To. I didn't find any clue in it.