Re: Is saferead not really safe on Solaris 8?

[Jorge Valdes <jvaldes@intercom.com.sv>]

Harald Hanche-Olsen wrote:
> We are seeing some qmail-smtpd processes hanging for days on end.  If
> truss is to be believed, they all hang in a read() on stdin, that is,
> on a socket read.
>
> Now this should not be possible, because qmail-smtpd uses saferead() on
> all network reads, and saferead first calls select() and then read()
> only if select() indicates that there is data to be read.  Surely, if
> select() said there is data, then read() cannot hang?
>
> So I begin to suspect an OS bug.  Has anybody else seen this?
>
> - Harald
>   
Me too. Solaris 9.
I have a script that kills off qmail-smtpd processes that have been 
running over 24 hours, since they just appear to do nothing other than 
to occupy tcpserver slots (annoying). I run a cron job once a day ~4am 
localtime and have had no complaints, but I haven't really given it 
serious consideration until now.
--
Jorge Valdes