Hi,
while developing kernel module that should use sock callback 'data_ready'
I have found that for the TCP socket it is never called.
I am totally confused at this point and would appreciate any help or hints
or whatever. Please note, that if I try to use this callback for UDP
socket everything is perfect ( like it is in RPC subsystem ).
I attach sample module that can be used to reproduce the problem:
yellow# gcc -D__KERNEL__ -DMODULE -I/usr/src/linux/include -c mod.c
yellow# cat >> /etc/inetd.conf
565 stream tcp nowait root /usr/bin/yes yes
^D
yellow# insmod ./mod.o
yellow# netstat -av
......................
tcp 32686 0 localhost:1025 localhost:565 ESTABLISHED
tcp 0 62824 localhost:565 localhost:1025 ESTABLISHED
.......................
yellow# tail /var/log/messages
Mar 20 00:35:56 yellow kernel: write_space callback
Mar 20 00:35:56 yellow kernel: write_space callback
Mar 20 00:35:56 yellow kernel: state_change callback
Mar 20 00:35:56 yellow kernel: write_space callback
Mar 20 00:35:56 yellow last message repeated 14 times
Mar 20 00:35:56 yellow kernel: Receiving message y 1 bytes long
Mar 20 00:35:56 yellow kernel: Receiving message
Mar 20 00:35:56 yellow kernel: 1 bytes long
Mar 20 00:35:56 yellow kernel: Receiving message y 1 bytes long
Mar 20 00:35:56 yellow kernel: Receiving message
Mar 20 00:35:56 yellow kernel: 1 bytes long
Mar 20 00:35:56 yellow kernel: Receiving message y 1 bytes long
Mar 20 00:35:56 yellow kernel: Receiving message
Mar 20 00:35:56 yellow kernel: 1 bytes long
Mar 20 00:35:56 yellow kernel: Receiving message y 1 bytes long
Mar 20 00:35:56 yellow kernel: Receiving message
Mar 20 00:35:56 yellow kernel: 1 bytes long
Mar 20 00:35:56 yellow kernel: Receiving message y 1 bytes long
Mar 20 00:35:56 yellow kernel: Receiving message
Mar 20 00:35:56 yellow kernel: 1 bytes long
Mar 20 00:35:56 yellow kernel: write_space callback
As you can see 'data_ready' is never called.
Thanks,
Roman.
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