SIOCGSTAMP does not work ?

[Maciej Soltysiak]

Hi,

i was recently trying to use SIOCGSTAMP to get the date of the last packet
that arrived on the socket. like so:

	struct timeval tv;
	...
	ioctl(fd, SIOCGSTAMP, &tv);

Unfortunately no matter how i tried that i always got errno: ENOENT, which
is explained by `man 7 ip':
SIOCGSTAMP was called on a socket where no packet arrived.

Little browsing through the net/ipv4 dir showed that there is a macro
TCP_CHECK_TIMER(sk) that is being used around tcp.c, tcp_ipv4.c and
tcp_timer.c

More grepping showed that TCP_CHECK_TIMER(sk) defined in include/net/tcp.h
does absolutely nothing!

#define TCP_CHECK_TIMER(sk) do { } while (0)

The questions are:
1. Is this all really related?

2. Why is TCP_CHECK_TIMER not coded ?

Regards,
Maciej Soltysiak

-----BEGIN GEEK CODE BLOCK-----
VERSION: 3.1
GIT/MU d-- s:- a-- C++ UL++++$ P L++++ E- W- N- K- w--- O! M- V- PS+ PE++
Y+ PGP- t+ 5-- X+ R tv- b DI+ D---- G e++>+++ h! y?
-----END GEEK CODE BLOCK-----