tcpdump mailing list archives
Re: select()ing on a pcap descriptor in Solaris
From: Guy Harris <guy () alum mit edu>
Date: Thu, 14 Aug 2014 15:01:33 -0700
On Aug 14, 2014, at 1:34 PM, Fernando Gont <fernando () gont com ar> wrote:
While trying to select() on a pcap descriptor in solaris
Which version? Solaris 11 (in which pcap descriptors should refer to BPF devices), or earlier (in which pcap descriptors should refer to DLPI STREAMS devices)?
I found the following: 1) It seems that pcap descriptors are never readable or writeable. (-- This is different from *BSD and Linux, where at least you seem to be able to check for readability) 2) It would seem that even trying to select() on such descriptors causes trouble. For example, I get a kind of random "Bad file number" error from select when I try to check for readability/writeability.
I wouldn't expect that prior to Solaris 11 - select() and poll() Just Work on STREAMS devices, as I remember. It could, however, be that Sun^WOracle screwed up with BPF; unfortunately, Solaris 11 is ClosedSolaris, so I can't just look at the source and see what they did wrong. I'll try this on my Solaris 11 virtual machine.
Is the above assessment correct? Should I not even try to call select() on pcap descriptors in Solaris?
If they screwed up on Solaris 11, you probably shouldn't try to call select(); instead, you should try to call Oracle and report this as a bug (and tell them that, if they fix this, they should fix it so that if you have a timeout set with BIOCSRTIMEOUT, the timer should start as soon as a select() or poll() is done, so that, when the timeout expires, it can report the descriptor as readable - the original BPF didn't do that, and all the *BSDs and OS X eventually fixed it). _______________________________________________ tcpdump-workers mailing list tcpdump-workers () lists tcpdump org https://lists.sandelman.ca/mailman/listinfo/tcpdump-workers
Current thread:
- select()ing on a pcap descriptor in Solaris Fernando Gont (Aug 14)
- Re: select()ing on a pcap descriptor in Solaris Guy Harris (Aug 14)
- Re: select()ing on a pcap descriptor in Solaris Fernando Gont (Aug 14)
- Re: select()ing on a pcap descriptor in Solaris Fernando Gont (Aug 18)
- Re: select()ing on a pcap descriptor in Solaris Guy Harris (Aug 14)