Re: Is saferead not really safe on Solaris 8?

[Henning Brauer <lists-qmail@bsws.de>]

* Harald Hanche-Olsen <hanche@math.ntnu.no> [2006-11-24 19:14]:
> 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?

AFAIR there is no guarantee that read() cannot block after select() 
anounced readability. The only way to make sure read() won't block is 
using nonblocking sockets.

however, I have no case at hand where select/poll would indicate 
readability and a read() thereafter would block.

-- 
Henning Brauer, hb@bsws.de, henning@openbsd.org
BS Web Services, http://bsws.de
Full-Service ISP - Secure Hosting, Mail and DNS Services
Dedicated Servers, Rootservers, Application Hosting - Hamburg & Amsterdam