recvmmsg/sendmmsg: add recvmmsg sendmmsg support.

The recvmmsg and sendmmsg is very important for UDP stream application.

If we only use recvmsg for UDP stream, it will only copy one mtu size
of data in a syscall. And recvmmsg copy as many as you want in a syscall.

So recvmmsg is more efficient,and some applications will depends on the
recvmmsg and sendmmsg, eg: UDP media stream player.

Signed-off-by: Guo Ren <ren_guo@c-sky.com>

include/sys/socket.h

@@ -97,6 +97,15 @@ typedef union { __SOCKADDR_ALLTYPES
 # undef __SOCKADDR_ONETYPE
 #endif
 
+#ifdef __USE_GNU
+/* For `recvmmsg' and `sendmmsg'.  */
+struct mmsghdr
+  {
+    struct msghdr msg_hdr;	/* Actual message header.  */
+    unsigned int msg_len;	/* Number of received or sent bytes for the
+				   entry.  */
+  };
+#endif
 
 /* Create a new socket of type TYPE in domain DOMAIN, using
    protocol PROTOCOL.  If PROTOCOL is zero, one is chosen automatically.
@@ -190,6 +199,17 @@ extern ssize_t sendmsg (int __fd, const struct msghdr *__message,
 			int __flags);
 libc_hidden_proto(sendmsg)
 
+#ifdef __USE_GNU
+/* Send a VLEN messages as described by VMESSAGES to socket FD.
+   Returns the number of datagrams successfully written or -1 for errors.
+
+   This function is a cancellation point and therefore not marked with
+   __THROW.  */
+extern ssize_t sendmmsg (int __fd, struct mmsghdr *__vmessages,
+			 size_t __vlen, int __flags);
+libc_hidden_proto(sendmmsg)
+#endif
+
 /* Receive a message as described by MESSAGE from socket FD.
    Returns the number of bytes read or -1 for errors.
 
@@ -198,6 +218,16 @@ libc_hidden_proto(sendmsg)
 extern ssize_t recvmsg (int __fd, struct msghdr *__message, int __flags);
 libc_hidden_proto(recvmsg)
 
+#ifdef __USE_GNU
+/* Receive up to VLEN messages as described by VMESSAGES from socket FD.
+   Returns the number of messages received or -1 for errors.
+
+   This function is a cancellation point and therefore not marked with
+   __THROW.  */
+extern ssize_t recvmmsg (int __fd, struct mmsghdr *__vmessages,
+			 size_t vlen, int __flags, struct timespec *__tmo);
+libc_hidden_proto(recvmmsg)
+#endif
 
 /* Put the current value for socket FD's option OPTNAME at protocol level LEVEL
    into OPTVAL (which is *OPTLEN bytes long), and set *OPTLEN to the value's

libc/inet/Makefile.in

@@ -47,7 +47,8 @@ CSRC-$(UCLIBC_HAS_RESOLVER_SUPPORT) += \
 socketcalls_CSRC-y += \
 	accept.c bind.c connect.c getpeername.c getsockname.c \
 	getsockopt.c listen.c recv.c recvfrom.c recvmsg.c send.c sendmsg.c \
-	sendto.c setsockopt.c shutdown.c socket.c socketpair.c
+	sendto.c setsockopt.c shutdown.c socket.c socketpair.c \
+	recvmmsg.c sendmmsg.c
 socketcalls_CSRC-$(UCLIBC_LINUX_SPECIFIC) += accept4.c
 CSRC-$(UCLIBC_HAS_SOCKET) += $(socketcalls_CSRC-y) opensock.c
 

libc/inet/recvmmsg.c

@@ -0,0 +1,8 @@
+/*
+ * Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
+ *
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+#define L_recvmmsg
+#include "socketcalls.c"

libc/inet/sendmmsg.c

@@ -0,0 +1,8 @@
+/*
+ * Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
+ *
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+#define L_sendmmsg
+#include "socketcalls.c"

libc/inet/socketcalls.c

@@ -29,6 +29,8 @@
 #define SYS_SENDMSG     16
 #define SYS_RECVMSG     17
 #define SYS_ACCEPT4     18
+#define SYS_RECVMMSG    19
+#define SYS_SENDMMSG    20
 #endif
 
 /* exposed on x86 since Linux commit 9dea5dc921b5f4045a18c63eb92e84dc274d17eb */
@@ -283,6 +285,30 @@ CANCELLABLE_SYSCALL(ssize_t, recvmsg, (int sockfd, struct msghdr *msg, int flags
 lt_libc_hidden(recvmsg)
 #endif
 
+#ifdef L_recvmmsg
+static ssize_t __NC(recvmmsg)(int sockfd, struct mmsghdr *msg, size_t vlen,
+			      int flags, struct timespec *tmo)
+{
+# ifdef __NR_recvmmsg
+	return (ssize_t)INLINE_SYSCALL(recvmmsg, 5, sockfd, msg, vlen, flags, tmo);
+# else
+	unsigned long args[5];
+
+	args[0] = sockfd;
+	args[1] = (unsigned long) msg;
+	args[2] = vlen;
+	args[3] = flags;
+	args[4] = (unsigned long) tmo;
+	return (ssize_t)__socketcall(SYS_RECVMMSG, args);
+# endif
+}
+CANCELLABLE_SYSCALL(ssize_t, recvmmsg,
+		    (int sockfd, struct mmsghdr *msg, size_t vlen, int flags,
+		     struct timespec *tmo),
+		    (sockfd, msg, vlen, flags, tmo))
+lt_libc_hidden(recvmmsg)
+#endif
+
 #ifdef L_send
 static ssize_t __NC(send)(int sockfd, const void *buffer, size_t len, int flags)
 {
@@ -324,6 +350,28 @@ CANCELLABLE_SYSCALL(ssize_t, sendmsg, (int sockfd, const struct msghdr *msg, int
 lt_libc_hidden(sendmsg)
 #endif
 
+#ifdef L_sendmmsg
+static ssize_t __NC(sendmmsg)(int sockfd, struct mmsghdr *msg, size_t vlen,
+			      int flags)
+{
+# ifdef __NR_sendmmsg
+	return (ssize_t)INLINE_SYSCALL(sendmmsg, 4, sockfd, msg, vlen, flags);
+# else
+	unsigned long args[4];
+
+	args[0] = sockfd;
+	args[1] = (unsigned long) msg;
+	args[2] = vlen;
+	args[3] = flags;
+	return (ssize_t)__socketcall(SYS_SENDMMSG, args);
+# endif
+}
+CANCELLABLE_SYSCALL(ssize_t, sendmmsg,
+		    (int sockfd, struct mmsghdr *msg, size_t vlen, int flags),
+		    (sockfd, msg, vlen, flags))
+lt_libc_hidden(sendmmsg)
+#endif
+
 #ifdef L_sendto
 ssize_t __NC(sendto)(int sockfd, const void *buffer, size_t len, int flags,
 		     const struct sockaddr *to, socklen_t tolen)

libpthread/nptl/Makefile.in

@@ -166,11 +166,13 @@ CFLAGS-readv.c = -fexceptions -fasynchronous-unwind-tables
 CFLAGS-recv.c = -fexceptions -fasynchronous-unwind-tables
 CFLAGS-recvfrom.c = -fexceptions -fasynchronous-unwind-tables
 CFLAGS-recvmsg.c = -fexceptions -fasynchronous-unwind-tables
+CFLAGS-recvmmsg.c = -fexceptions -fasynchronous-unwind-tables
 CFLAGS-__rt_sigtimedwait.c = -fexceptions -fasynchronous-unwind-tables
 CFLAGS-__rt_sigwaitinfo.c = -fexceptions -fasynchronous-unwind-tables
 CFLAGS-select.c = -fexceptions -fasynchronous-unwind-tables
 CFLAGS-send.c = -fexceptions -fasynchronous-unwind-tables
 CFLAGS-sendmsg.c = -fexceptions -fasynchronous-unwind-tables
+CFLAGS-sendmmsg.c = -fexceptions -fasynchronous-unwind-tables
 CFLAGS-sendto.c = -fexceptions -fasynchronous-unwind-tables
 CFLAGS-sigpause.c = -fexceptions
 CFLAGS-sigsuspend.c = -fexceptions -fasynchronous-unwind-tables