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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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arch/alpha/include/asm/socket.h
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@@ -32,6 +32,7 @@
#define SO_RCVTIMEO 0x1012
#define SO_SNDTIMEO 0x1013
#define SO_ACCEPTCONN 0x1014
#define SO_PROTOCOL 0x1028
/* linux-specific, might as well be the same as on i386 */
#define SO_NO_CHECK 11