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sock: Introduce the SO_PEEK_OFF sock option

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This one specifies where to start MSG_PEEK-ing queue data from. When
set to negative value means that MSG_PEEK works as ususally -- peeks
from the head of the queue always.

When some bytes are peeked from queue and the peeking offset is non
negative it is moved forward so that the next peek will return next
portion of data.

When non-peeking recvmsg occurs and the peeking offset is non negative
is is moved backward so that the next peek will still peek the proper
data (i.e. the one that would have been picked if there were no non
peeking recv in between).

The offset is set using per-proto opteration to let the protocol handle
the locking issues and to check whether the peeking offset feature is
supported by the protocol the socket belongs to.

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pavel Emelyanov 2012-02-21 07:31:34 +00:00 • committed by David S. Miller
parent da5ef6e51b
commit ef64a54f6e
20 changed files with 56 additions and 0 deletions
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1
arch/sparc/include/asm/socket.h
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@ -60,6 +60,7 @@
#define SO_WIFI_STATUS 0x0025
#define SCM_WIFI_STATUS SO_WIFI_STATUS
#define SO_PEEK_OFF 0x0026
/* Security levels - as per NRL IPv6 - don't actually do anything */
#define SO_SECURITY_AUTHENTICATION 0x5001