tcpdump mailing list archives
Re: Patch: optimizations and improvements for Endace DAG cards.
From: Koryn Grant <koryn () endace com>
Date: Thu, 20 Nov 2003 16:34:37 +1300 (NZDT)
On Wed, 19 Nov 2003, Guy Harris wrote:
On Nov 19, 2003, at 5:40 PM, Koryn Grant wrote:Yes - the (non)blocking support consists of simply setting the appropriate flag to call dag_offset() in a (non)blocking way.So does "dag_open()" return a UNIX-style file descriptor and, if so, does setting non-blocking mode on the FD returned by "dag_open()" have any effect?
dag_open() does return a UNIX-style file descriptor, but the standard fd calls to set non-blocking mode have no effect. This can only be done via the flags parameter to dag_offset().
I've just checked in changes to do the setting and getting of non-blocking mode in functions pointed to by pointers in the "pcap_t" structure, rather than using the pile of #ifdefs and run-time checks we had before;
That'll be much nicer.
if "dag_open()" doesn't return a UNIX-style file descriptor, or if it does but setting non-blocking mode on it has no effect (or isn't necessary to get "dag_offset()" not to block, you could add a "dag_getnonblock()" routine that just checks "p->md.dag_offset_flags" and returns 1 if DAGF_NONBLOCK is set and 0 otherwise, and change "dag_setnonblock()" not to bother calling "pcap_setnonblock()".
I'll update my libpcap tree and get on to this.
Also, if "dag_open()" returns a UNIX-style file descriptor (e.g., a descriptor referring to the DAG device), can you do a "select()" or "poll()" on it
No, it doesn't play nicely with select()/poll() at the moment. Cheers, Koryn -- Dr Koryn Grant phone +64 7 8346729 Senior Software Engineer mobile +64 21 488386 Endace Technology Ltd email koryn () endace com Hamilton, New Zealand web http://www.endace.com/ - This is the TCPDUMP workers list. It is archived at http://www.tcpdump.org/lists/workers/index.html To unsubscribe use mailto:tcpdump-workers-request () tcpdump org?body=unsubscribe
Current thread:
- Patch: optimizations and improvements for Endace DAG cards. Koryn Grant (Nov 19)
- Re: Patch: optimizations and improvements for Endace DAG cards. Guy Harris (Nov 19)
- Re: Patch: optimizations and improvements for Endace DAG cards. Koryn Grant (Nov 19)
- Re: Patch: optimizations and improvements for Endace DAG cards. Guy Harris (Nov 19)
- Re: Patch: optimizations and improvements for Endace DAG cards. Koryn Grant (Nov 19)
- Re: Patch: optimizations and improvements for Endace DAG cards. Koryn Grant (Nov 19)
- Re: Patch: optimizations and improvements for Endace DAG cards. Guy Harris (Nov 19)