tipc: Add support for SO_RCVTIMEO socket option

Adds support for the SO_RCVTIMEO socket option to TIPC's socket
receive routines.

Thanks go out to Raj Hegde <rajenhegde@yahoo.ca> for his contribution
to the development and testing this enhancement.

Signed-off-by: Allan Stephens <Allan.Stephens@windriver.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

1 files changed, 17 insertions, 15 deletions

diff --git a/net/tipc/socket.c b/net/tipc/socket.c
index d45a294f47e9..29d94d53198d 100644
--- a/net/tipc/socket.c
+++ b/net/tipc/socket.c
@@ -58,6 +58,9 @@ struct tipc_sock {
 #define tipc_sk(sk) ((struct tipc_sock *)(sk))
 #define tipc_sk_port(sk) ((struct tipc_port *)(tipc_sk(sk)->p))
 
+#define tipc_rx_ready(sock) (!skb_queue_empty(&sock->sk->sk_receive_queue) || \
+                        (sock->state == SS_DISCONNECTING))
+
 static int backlog_rcv(struct sock *sk, struct sk_buff *skb);
 static u32 dispatch(struct tipc_port *tport, struct sk_buff *buf);
 static void wakeupdispatch(struct tipc_port *tport);
@@ -911,6 +914,7 @@ static int recv_msg(struct kiocb *iocb, struct socket *sock,
         struct tipc_port *tport = tipc_sk_port(sk);
         struct sk_buff *buf;
         struct tipc_msg *msg;
+        long timeout;
         unsigned int sz;
         u32 err;
         int res;
@@ -927,6 +931,7 @@ static int recv_msg(struct kiocb *iocb, struct socket *sock,
                 goto exit;
         }
 
+        timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
 restart:
 
         /* Look for a message in receive queue; wait if necessary */
@@ -936,17 +941,15 @@ restart:
                         res = -ENOTCONN;
                         goto exit;
                 }
-                if (flags & MSG_DONTWAIT) {
-                        res = -EWOULDBLOCK;
+                if (timeout <= 0L) {
+                        res = timeout ? timeout : -EWOULDBLOCK;
                         goto exit;
                 }
                 release_sock(sk);
-                res = wait_event_interruptible(*sk_sleep(sk),
-                        (!skb_queue_empty(&sk->sk_receive_queue) ||
-                         (sock->state == SS_DISCONNECTING)));
+                timeout = wait_event_interruptible_timeout(*sk_sleep(sk),
+                                                           tipc_rx_ready(sock),
+                                                           timeout);
                 lock_sock(sk);
-                if (res)
-                        goto exit;
         }
 
         /* Look at first message in receive queue */
@@ -1034,6 +1037,7 @@ static int recv_stream(struct kiocb *iocb, struct socket *sock,
         struct tipc_port *tport = tipc_sk_port(sk);
         struct sk_buff *buf;
         struct tipc_msg *msg;
+        long timeout;
         unsigned int sz;
         int sz_to_copy, target, needed;
         int sz_copied = 0;
@@ -1054,7 +1058,7 @@ static int recv_stream(struct kiocb *iocb, struct socket *sock,
         }
 
         target = sock_rcvlowat(sk, flags & MSG_WAITALL, buf_len);
-
+        timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
 restart:
 
         /* Look for a message in receive queue; wait if necessary */
@@ -1064,17 +1068,15 @@ restart:
                         res = -ENOTCONN;
                         goto exit;
                 }
-                if (flags & MSG_DONTWAIT) {
-                        res = -EWOULDBLOCK;
+                if (timeout <= 0L) {
+                        res = timeout ? timeout : -EWOULDBLOCK;
                         goto exit;
                 }
                 release_sock(sk);
-                res = wait_event_interruptible(*sk_sleep(sk),
-                        (!skb_queue_empty(&sk->sk_receive_queue) ||
-                         (sock->state == SS_DISCONNECTING)));
+                timeout = wait_event_interruptible_timeout(*sk_sleep(sk),
+                                                           tipc_rx_ready(sock),
+                                                           timeout);
                 lock_sock(sk);
-                if (res)
-                        goto exit;
         }
 
         /* Look at first message in receive queue */