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ss: small optim in tcp_show_info()

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Kernel can give us smaller tcp_info than our.

We copy the kernel provided structure and fill with 0
the remaining part.

Lets clear only the missing part to save some cycles, as we intend to
slightly increase tcp_info size in the future.

Signed-off-by: Eric Dumazet <edumazet@google.com>
This commit is contained in:
Eric Dumazet 2015-05-06 11:33:23 -07:00 committed by Stephen Hemminger
parent 38a7f26828
commit 656e8fdd2d
1 changed files with 1 additions and 1 deletions
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2
misc/ss.c
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@ -1893,8 +1893,8 @@ static void tcp_show_info(const struct nlmsghdr *nlh, struct inet_diag_msg *r,
/* workaround for older kernels with less fields */
if (len < sizeof(*info)) {
info = alloca(sizeof(*info));
memset(info, 0, sizeof(*info));
memcpy(info, RTA_DATA(tb[INET_DIAG_INFO]), len);
memset((char *)info + len, 0, sizeof(*info) - len);
} else
info = RTA_DATA(tb[INET_DIAG_INFO]);