RE: [PHP] Check for open file

On Thu, 2011-03-03 at 15:29 -0500, Steve Staples wrote: > On Thu, 2011-03-03 at 13:23 -0700, Ashley M. Kirchner wrote: > > > Write the file with a temporary name and extension. Once the file is > > closed, > > > change the name to the pattern your server is looking for. Once you finish > > > processing it, either change the name again, or move it to a different > > > directory. Don't reuse the same file name, but add a numeric value which > > > increases every time you create it. Keep a log of which files have been > > > processed and any errors each one produced. > > > > > > Bob McConnell > > > > I can't require nor expect those copying the files into the share folder to > > do this. No, they will simply be grabbing a set of image files from one > > network share and drag them into this Samba share, as is. I'm not worried > > with what happens when PHP picks it up (name changes, moving to a diff > > folder, etc., etc.) I'm only concerned with the first step ... picking up > > the file only *after* it's done copying. > > > > I can run PHP as a timed crontask, but I need to figure out a safe way for > > it to either grab a file or leave it alone because it's not done yet. > > > > > > If i recall correctly, with FTP, the file is copied into the directory, > but it is not "ready" for use... I have an application that reads the > contents of a FTP directory, looking for files there... i've never had > any issues where it only got a part of the file (that i know of > anyways)... maybe the samba does the same thing? > > how large are these files (or how large would the largest file typically > be) ? would it be worth looking at the "time" of the file, and waiting > until that file is at least (say) 5 mintues old, then do something with > it? if it only takes < 1 minute to put these files on teh share, then > maybe you can reduce that time... > > Just thinking of alternatives... > > Steve > > As far as I was aware, if you're in the middle of writing to a file and another script was attempting to write to it, the OS would prevent that as you had an open lock on it. -- Thanks, Ash http://www.ashleysheridan.co.uk