[PATCH] socket.2: document AF_ALG

[Stephan Mueller <stephan.mueller-fwYZOkdEjagAvxtiuMwx3w@public.gmane.org>]

Add a reference to the AF_ALG protocol accessible via socket(2).

Signed-off-by: Stephan Mueller <stephan.mueller-fwYZOkdEjagAvxtiuMwx3w@public.gmane.org>
CC: Herbert Xu <herbert-lOAM2aK0SrRLBo1qDEOMRrpzq4S04n8Q@public.gmane.org>
---
 man2/socket.2 | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/man2/socket.2 b/man2/socket.2
index 229dab3..8885079 100644
--- a/man2/socket.2
+++ b/man2/socket.2
@@ -116,6 +116,11 @@ Low level packet interface
 T}:T{
 .BR packet (7)
 T}
+T{
+.B AF_ALG
+T}:T{
+Interface to kernel crypto API
+T}
 .TE
 .PP
 The socket has the indicated
@@ -378,6 +383,12 @@ families.
 However, already the BSD man page promises: "The protocol
 family generally is the same as the address family", and subsequent
 standards use AF_* everywhere.
+
+The AF_ALG protocol type is added with kernel version 2.6.38. More
+information on this interface is provided with
+Documentation/crypto/crypto-API-userspace.txt provided in the
+Linux kernel source code tree.
+
 .SH EXAMPLE
 An example of the use of
 .BR socket ()
-- 
2.1.0


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