Author: kib
Date: Sun Feb 26 13:55:43 2012
New Revision: 232179
URL: http://svn.freebsd.org/changeset/base/232179

Log:
  Add SO_PROTOCOL/SO_PROTOTYPE socket SOL_SOCKET-level option to get the
  socket protocol number.  This is useful since the socket type can
  be implemented by different protocols in the same protocol family,
  e.g. SOCK_STREAM may be provided by both TCP and SCTP.
  
  Submitted by: Jukka A. Ukkonen <jau iki fi>
  PR:     kern/162352
  Discussed with:       bz
  Reviewed by:  glebius
  MFC after:    2 weeks

Modified:
  head/sys/kern/uipc_socket.c
  head/sys/sys/socket.h

Modified: head/sys/kern/uipc_socket.c
==============================================================================
--- head/sys/kern/uipc_socket.c Sun Feb 26 13:51:05 2012        (r232178)
+++ head/sys/kern/uipc_socket.c Sun Feb 26 13:55:43 2012        (r232179)
@@ -2733,6 +2733,10 @@ integer:
                        optval = so->so_type;
                        goto integer;
 
+               case SO_PROTOCOL:
+                       optval = so->so_proto->pr_protocol;
+                       goto integer;
+
                case SO_ERROR:
                        SOCK_LOCK(so);
                        optval = so->so_error;

Modified: head/sys/sys/socket.h
==============================================================================
--- head/sys/sys/socket.h       Sun Feb 26 13:51:05 2012        (r232178)
+++ head/sys/sys/socket.h       Sun Feb 26 13:55:43 2012        (r232179)
@@ -138,6 +138,8 @@ typedef     __uid_t         uid_t;
 #define        SO_LISTENINCQLEN        0x1013  /* socket's incomplete queue 
length */
 #define        SO_SETFIB       0x1014          /* use this FIB to route */
 #define        SO_USER_COOKIE  0x1015          /* user cookie (dummynet etc.) 
*/
+#define        SO_PROTOCOL     0x1016          /* get socket protocol (Linux 
name) */
+#define        SO_PROTOTYPE    SO_PROTOCOL     /* alias for SO_PROTOCOL (SunOS 
name) */
 #endif
 
 /*
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