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net: implement a SO_PROTOCOL getsockoption

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Similar to SO_TYPE returning the socket type, SO_PROTOCOL allows to
retrieve the protocol used with a given socket.

I am not quite sure why we have that-many copies of socket.h, and why
the values are not the same on all arches either, but for where hex
numbers dominate, I use 0x1029 for SO_PROTOCOL as that seems to be
the next free unused number across a bunch of operating systems, or
so Google results make me want to believe. SO_PROTOCOL for others
just uses the next free Linux number, 38.

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jan Engelhardt
2009-08-04 07:28:28 +00:00
committed by David S. Miller
parent c1c00ab862
commit 49c794e946
20 changed files with 40 additions and 0 deletions
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5
net/core/sock.c
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@@ -482,6 +482,7 @@ int sock_setsockopt(struct socket *sock, int level, int optname,
sk->sk_reuse = valbool;
break;
case SO_TYPE:
case SO_PROTOCOL:
case SO_ERROR:
ret = -ENOPROTOOPT;
break;
@@ -764,6 +765,10 @@ int sock_getsockopt(struct socket *sock, int level, int optname,
v.val = sk->sk_type;
break;
case SO_PROTOCOL:
v.val = sk->sk_protocol;
break;
case SO_ERROR:
v.val = -sock_error(sk);
if (v.val == 0)