Facing issue in dns timeout

Khem Raj raj.khem at gmail.com
Thu Jan 28 18:19:08 UTC 2010

On (28/01/10 21:30), yathish chandru wrote:
> Hi All,
> I'm presently using uClibc- , in that the proble facing when I make
> a call for getaddrinfo().
> Occasionaly the DNS server is taking long DNS response, so after verifying
> the resolv.c file,
> Found that getaddrinfo,uClibc library and we found that it is hard coded to
> 10 Seconds. Attaching the file resolv.c from uclibc.
> Please look at the function __dns_lookup() and grep for REPLY_TIMEOUT, so in
> the function is in loop for MAX_RETRIES with REPLY_TIMOUT in the select
> posix call.
> So, since the  REPLY_TIMEOUT is hard coded, and I didn't find any function
> to override the timeout. To reduce the timeout we need to recompile UClibc
> library.
>  So, the RES_TIMEOUT which is avalable in resolv.conf is of no use.
> Since, the problem in our application is the first dns request in
> getaddrinfo is failing and the second one passes, so wanted to retry by
> reducing the timeout but foud no option.
> Is this the same behaviour in lthe latest uclibc. Please let us know on this
> issue.

now it has been reduced to 5sec but is still hardcoded. For resolv.conf
I only see 'domain', 'search' and 'nameserver' keywords being handled so
timeout:n may not work
> Thanks for the help.
> Regards
> yathish
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