diff --git a/include/cutils/sockets.h b/include/cutils/sockets.h
index 6cffe12..cb9b3ff 100644
--- a/include/cutils/sockets.h
+++ b/include/cutils/sockets.h
@@ -30,12 +30,15 @@
 
 typedef int  socklen_t;
 typedef SOCKET cutils_socket_t;
+typedef WSABUF cutils_socket_buffer_t;
 
 #else
 
 #include <sys/socket.h>
+#include <sys/uio.h>
 
 typedef int cutils_socket_t;
+typedef struct iovec cutils_socket_buffer_t;
 #define INVALID_SOCKET (-1)
 
 #endif
@@ -137,6 +140,28 @@
 int socket_get_local_port(cutils_socket_t sock);
 
 /*
+ * Sends to a socket from multiple buffers; wraps writev() on Unix or WSASend()
+ * on Windows. This can give significant speedup compared to calling send()
+ * multiple times.
+ *
+ * Because Unix and Windows use different structs to hold buffers, we also
+ * need a generic function to set up the buffers.
+ *
+ * Example usage:
+ *   cutils_socket_buffer_t buffers[2] = {
+ *       make_cutils_socket_buffer(data0, len0),
+ *       make_cutils_socket_buffer(data1, len1)
+ *   };
+ *   socket_send_buffers(sock, buffers, 2);
+ *
+ * Returns the number of bytes written or -1 on error.
+ */
+cutils_socket_buffer_t make_cutils_socket_buffer(void* data, size_t length);
+ssize_t socket_send_buffers(cutils_socket_t sock,
+                            cutils_socket_buffer_t* buffers,
+                            size_t num_buffers);
+
+/*
  * socket_peer_is_trusted - Takes a socket which is presumed to be a
  * connected local socket (e.g. AF_LOCAL) and returns whether the peer
  * (the userid that owns the process on the other end of that socket)