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Date:	Fri, 26 Mar 2010 21:18:03 -0500
From:	Brandon L Black <>
Cc:	"David S. Miller" <>,
	Arnaldo Carvalho de Melo <>,
	Ulrich Drepper <>,
Subject: [PATCH v2] Add MSG_WAITFORONE flag to recvmmsg

From: Brandon L Black <>

Add new flag MSG_WAITFORONE for the recvmmsg() syscall.
When this flag is specified for a blocking socket, recvmmsg()
will only block until at least 1 packet is available.  The
default behavior is to block until all vlen packets are
available.  This flag has no effect on non-blocking sockets
or when used in combination with MSG_DONTWAIT.

Signed-off-by: Brandon L Black <>

diff --git a/include/linux/socket.h b/include/linux/socket.h
index 7b3aae2..354cc56 100644
--- a/include/linux/socket.h
+++ b/include/linux/socket.h
@@ -255,6 +255,7 @@ struct ucred {
 #define MSG_ERRQUEUE	0x2000	/* Fetch message from error queue */
 #define MSG_NOSIGNAL	0x4000	/* Do not generate SIGPIPE */
 #define MSG_MORE	0x8000	/* Sender will send more */
+#define MSG_WAITFORONE	0x10000	/* recvmmsg(): block until 1+ packets avail */
 #define MSG_EOF         MSG_FIN
diff --git a/net/socket.c b/net/socket.c
index 769c386..f55ffe9 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -2135,6 +2135,10 @@ int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
+		/* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */
+		if (flags & MSG_WAITFORONE)
+			flags |= MSG_DONTWAIT;
 		if (timeout) {
 			*timeout = timespec_sub(end_time, *timeout);
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