[ntp:questions] ntpd failure on ioctl(I_SETSIG, S_INPUT): Bbad address

Danny Mayer mayer at ntp.isc.org
Sat Feb 7 21:52:55 UTC 2009

Harlan Stenn wrote:
>>>> In article <977AD296BDAF2F428CF7028F923E4A200AF1A3D6 at earth.impinj.com>, wayne.liu at impinj.com (Wayne Liu) writes:
> Wayne> Hello All; I'm running the latest ntp-4.2.4p6 on Linux 2.6.18 and I
> Wayne> got the following up front when I start ntpd: =========== ntpd
> Wayne> 4.2.4p6 at 1.1549 Fri Feb 6 02:09:46 UTC 2009 (3) ....  setsockopt
> Wayne> SO_TIMESTAMP enabled on fd 16 address bind() fd 16, family 2,
> Wayne> port 123, addr, flags=0x89 addto_syslog: init_socket_sig:
> Wayne> ioctl(I_SETSIG, S_INPUT) failed: Bad address ==========
> Wayne> From the kernel code it seems that "Bad address" is due to I_SETSIG not
> Wayne> being supported by sock as an ioctl cmd, which is then passed down to
> Wayne> dev_ioctl underneath which rejects the arg S_INPUT as bad address.
> Wayne> I noticed the code that invokes ioctl(I_SETSIG, S_INPUT) is gated by
> Wayne> #ifdef USE_UDP_SIGPOLL, which the auto configure turns on.  But the
> Wayne> kernel somehow thinks it's not supported.  Am I doing something wrong
> Wayne> with the configure?  Or is there a Linux kernel version dependency
> Wayne> that I'm missing.
> The configure choices for USE_UDP_SIGPOLL were done a long time ago and
> might have changed.

I think that's what Frank implemented recently for dynamic interface

> I'd appreciate learning how to discern the correct answer for your case.
> I do not know what the correct answer is...

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