Samba has a problem when adding printer drivrs via rpcclient when the printer drivers has more than approx 120 driver files.

I noticed that problem when adding a driver for a Canon TM-255 plotter. It has 147 depend files and the command:

> FILES="CNWT10GM.UPD,CNWUO411.DLL,.... 145 more files"
> rpcclient -U Administrator%secret SERV00 -c "adddriver \"Windows x64\" \"Canon TM-255:CNWUOM.DLL:CNWT10GM.XPD:CNWUOMUI.DLL:NULL:NULL:$FILES\""

failes with WERR_APP_INIT_FAILURE.

This is because all spoolss processes are running with a maximal number of open files of 270.

I tried to fix this within the samba source, but I did find the right spot to raise the open files limit.

If I do:

for pid in <list of PIDs of all spoolss procs>; do
  prlimit -n500:16384 -p$pid
done

the problem is temporarily fixed and the above rpcclient command sucessfully adds the driver.

Here's what David Disseldorp wrote on the samba mailing list:

> Hi Peter,
>
> Thanks a lot for your report and follow-up.
> smbd and winbindd already attempt to manually set RLIMIT_NOFILE limits
> based on configuration of "max open files" and "winbind max domain
> connections" respectively. I think it'd make sense to also attempt to
> raise the limit for Samba rpc daemons.
> Would you be able to raise a bugzilla.samba.org ticket for this? That
> should ensure that we don't forget about it.
> 
> Cheers, David

Kind regards

Peter