Re: Is saferead not really safe on Solaris 8?

[Harald Hanche-Olsen <hanche@math.ntnu.no>]

+ Henning Brauer <lists-qmail@bsws.de>:

| 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.

Hmm.  Interesting, though I am not sure what to make of it.

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

Well, it seems to happen.  I wonder if it could if a signal arrives at
an inopportune moment?  (I just stumbled across djb's page on the
self-pipe trick at http://cr.yp.to/docs/selfpipe.html - but since he
has not employed it in qmail-smtpd, he must have been assuming that it
is not relevant.)

- Harald