Hi all,
Excuse me if this is a very silly question but I was exploring the TCP
code in the kernel and found the following statement. in
"include/net/tcp.h"
#define TCP_CHECK_TIMER(sk) do { } while (0)
In the function tcp_v4_do_rcv() the above macro is called a few
times. I could not understand the purpose of that. Aparantly the macro
is doing nothing.
I have also checked the FAQ on kernelnewbies related to the "do { ...
} while (0) " statements, and it says such macros are used to have a
block of statements without errors on subsitution. But that only
makes sense if we have some statements inside the do loop.
Can someone help me out here. I must be missing something very obvious.
shourya
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