ISC BIND 9.3.5-P2 is now available

[Gary Mills]

In <g7arrk$27u0$1 at sf1.isc.org> The Doctor <doctor at doctor.nl2k.ab.ca> writes:

>On Sun, Aug 03, 2008 at 12:24:28AM -0700, JINMEI Tatuya / ?$B?@L at C#:H wrote:
>> At Sat, 2 Aug 2008 11:21:47 -0600,
>> The Doctor <doctor at doctor.nl2k.ab.ca> wrote:
>> > 
>> > I do not see this in the P1, but is plaguing the P2s:
>> 
>> > Aug  2 11:15:25 doctor named[14742]: socket.c:485: unexpected error:
>> > Aug  2 11:15:25 doctor named[14742]: fcntl(512, F_SETFL, -1): Bad file descriptor
>> 
>> Try specifying a small value such as 32 for the reserved-sockets
>> option:

>Interesting.  Here is what I have found:

>doctor.nl2k.ab.ca//usr/source/selecttest$ ./selecttest
>selecttest: nsocks = 4093, TEST_FDSETSIZE = -1, FD_SETSIZE = 1024, sizeof fd_set
> = 128
>opening 62th socket failed: Too many open files
>doctor.nl2k.ab.ca//usr/source/selecttest$ ./selecttest -r
>selecttest: nsocks = 4093, TEST_FDSETSIZE = -1, FD_SETSIZE = 1024, sizeof fd_set
> = 128
>created 4093 sockets, maxfd = 4095
>FD_CLR test...OK
>FD_SET test...OK
>select test...OK

Here's what I get on Solaris 9, first as an ordinary user...

  <mills at hadar:237>$ ./selecttest
  selecttest: nsocks = 4093, TEST_FDSETSIZE = -1, FD_SETSIZE = 1024, sizeof fd_set = 128
  opening 254th socket failed: Too many open files
  <mills at hadar:238>$ ./selecttest -r
  selecttest: nsocks = 4093, TEST_FDSETSIZE = -1, FD_SETSIZE = 1024, sizeof fd_set = 128
  set resource limit: Not owner
  <mills at hadar:241>$ ./selecttest 250
  selecttest: nsocks = 4093, TEST_FDSETSIZE = -1, FD_SETSIZE = 1024, sizeof fd_set = 128
  created 250 sockets, maxfd = 252
  FD_CLR test...OK
  FD_SET test...OK
  select test...OK

Now, as root...

  # ./selecttest -r
  selecttest: nsocks = 4093, TEST_FDSETSIZE = -1, FD_SETSIZE = 1024, sizeof fd_set = 128
  created 4093 sockets, maxfd = 4095
  FD_CLR test...OK
  FD_SET test...OK
  select: Invalid argument
  select test...
  # ./selecttest -r 1022
  selecttest: nsocks = 4093, TEST_FDSETSIZE = -1, FD_SETSIZE = 1024, sizeof fd_set = 128
  created 1022 sockets, maxfd = 1024
  FD_CLR test...OK
  FD_SET test...OK
  select: Invalid argument
  select test...
  # ./selecttest -r 1020
  selecttest: nsocks = 4093, TEST_FDSETSIZE = -1, FD_SETSIZE = 1024, sizeof fd_set = 128
  created 1020 sockets, maxfd = 1022
  FD_CLR test...OK
  FD_SET test...OK
  select test...OK

Here's the explanation, from the select man page:

     EINVAL    The nfds argument is less than 0 or  greater  than
               FD_SETSIZE.

It also contains this statement:

     The poll(2) function is preferred  over  this  function.  It
     must  be  used  when  the number of file descriptors exceeds
     FD_SETSIZE.

sendmail uses poll for Solaris.

Now, bind-9.3.5-P2 works nicely under Solaris 9, at least on a
quiet server.  The number of file descriptors used for sockets is
low, in the 10 to 30 range.  Here's an example:

  # pfiles 4013 | grep S_IFSOCK | wc -l
        13

CPU usage is generally also reasonable.
select() works correctly because bind always sets `files = FD_SETSIZE'
and then reserves 512 of them.

I'm about to start bind-9.3.5-P2 on a busier server, replacing
bind-9.3.2-P2.  I don't expect any problems.

-- 
-Gary Mills-    -Unix Support-    -U of M Academic Computing and Networking-