[Samba] File locking with smbd
ron.cococcia at request.com
Fri Oct 22 19:48:42 GMT 2004
I have a problem and haven't been able to figure it out yet. I was
running a test of an upload mechanism the product my company makes uses.
The idea is that users can upload files to a share, and we
process/archive those files when they have been added. It would try to
detect if a file is in use, and if that were so, it would skip that
particular file and come back to it later. The problem that I
discovered is that I was unable to programmatically detect whether a
file was currently in use by smbd (using typical system calls).
Searching through smb.conf's man page, I tried a few different options
with no luck. I would like to use something like fcntl(F_GETLK...) to
determine if there are any locks on the file, but I haven't been able to
detect any. strace shows that smbd does lock files, but as far as I can
tell, only the log files.
Does smbd have the capability to lock files that it has in use? Is it
possible that if it were to lock files, that I misconfigured/miscompiled
smbd? I'd prefer to not use a kludge like popen("smbstatus") or
popen("lsof"). I might consider examining the last modification
timestamp on the file too, but I don't know if there might be other
cases where that wouldn't work.
Thanks in advance!
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