[PATCH] Add a function for dumping iovec in msghdr used in sendmsg and recvmsg

[Dmitry V. Levin]

Hi,

On Wed, Oct 15, 2014 at 10:11:43PM +0900, Masatake YAMATO wrote:
> * syscall.c (dumpio): Call dumpiov_in_msghdr if
> the target function is recvmsg or sendmsg.
> 
> * net.c (extractmsghdr): New function derived from
> `printmsghdr'.
> (printmsghdr): Use `extractmsghdr'.
> (dumpiov_in_msghdr): New function.
> 
> * defs.h: Add a declaration for `dumpiov_in_msghdr'.
> 
> Here is an example session:
> 
>     $ ./strace -e write=all ip link change dev enp0s25 mtu 1501 > /dev/null
>     sendmsg(3, {msg_name(12)={sa_family=AF_NETLINK, pid=0, groups=00000000}, msg_iov(1)=[{"(...
>      * 40 bytes in buffer 0
>      | 00000  28 00 00 00 10 00 05 00  d0 d9 aa 53 00 00 00 00  (..........S.... |
>      | 00010  00 00 00 00 02 00 00 00  00 00 00 00 00 00 00 00  ................ |
>      | 00020  08 00 04 00 dd 05 00 00                           ........         |
>     ...
> 
>     $ ./strace -e read=all ip link show > /dev/null
>     recvmsg(3, {msg_name(12)={sa_family=AF_NETLINK, pid=0, groups=00000000}, msg_iov(1)=[{"...
>      * 8192 bytes in buffer 0
>      | 00000  34 00 00 00 02 00 00 00  00 00 00 00 ff 23 00 00  4............#.. |
>      | 00010  ff ff ff ff 20 00 00 00  10 00 05 00 00 00 00 00  .... ........... |
>     ...

Thanks, applied with minor changes.


-- 
ldv
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