Connecting to hddtemp-daemon for multiple disks with netcat randomly gives only partial results

[Christoph von Stuckrad]

Binary package hint: hddtemp

Having five disks (boot plus raid) and running hddtemp in daemon mode (default except explicitely given disks)
by 'netcat localhost 7543' I get shortened result strings. I assume this to be a classcal problem of the following structure:
hddtemp (tested with strace in no-fork mode) produces strings for each disk
with an extra 'write(send, whaever)';
these 'are sent' to the network one after the opther,
but hddtemp closes the connection too fast, so the 'out of band close (FIN?)'
overruns from all to none parts/packets/pipe-writes
and the receivers randomly sees shortened answers.

This may be fixed by collecting all parts of the answer in one string first to send at once
and by waiting a time before closing.

seen in: (ubuntu 10.10; hddtemp 0.3-beta15-46)

Stucki

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: hddtemp 0.3-beta15-46
ProcVersionSignature: Ubuntu 2.6.35-28.50-generic 2.6.35.11
Uname: Linux 2.6.35-28-generic i686
NonfreeKernelModules: fglrx
Architecture: i386
Date: Sun May 1 19:26:15 2011
InstallationMedia: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release i386 (20100816.1)
ProcEnviron:
 PATH=(custom, user)
 LANG=de_DE.UTF-8
 SHELL=/bin/zsh
SourcePackage: hddtemp

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[arclance (arclancesu)]

I have a ssd with no temperature sensor and a normal hardrive with a temperature sensor and I noticed that this bug also affects those only having one drive with a temperature sensor. Sometimes 'netcat localhost 7634' returns and empty string with this setup. I have another computer with more than 10 drives and that computer returns a random sample of the drives temperatures (never all of them) and sometimes returns an empty string. Both computers are running Ubuntu 11.04 using hddtemp 0.3-beta15-46.