1 files changed, 94 insertions, 0 deletions
diff --git a/lib/libsys/recvmmsg.c b/lib/libsys/recvmmsg.c
new file mode 100644
index 000000000000..24c4abf58287
--- /dev/null
+++ b/lib/libsys/recvmmsg.c
@@ -0,0 +1,94 @@
+/*
+ * Copyright (c) 2016 Boris Astardzhiev, Smartcom-Bulgaria AD
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice(s), this list of conditions and the following disclaimer as
+ *    the first lines of this file unmodified other than the possible
+ *    addition of one or more copyright notices.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice(s), this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+ * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <errno.h>
+#include <poll.h>
+#include <stddef.h>
+#include "libc_private.h"
+
+ssize_t
+recvmmsg(int s, struct mmsghdr *__restrict msgvec, size_t vlen, int flags,
+    const struct timespec *__restrict timeout)
+{
+	struct pollfd pfd[1];
+	size_t i, rcvd;
+	ssize_t ret;
+	int res;
+	short ev;
+
+	if (timeout != NULL) {
+		pfd[0].fd = s;
+		pfd[0].revents = 0;
+		pfd[0].events = ev = POLLIN | POLLRDNORM | POLLRDBAND |
+		    POLLPRI;
+		res = ppoll(&pfd[0], 1, timeout, NULL);
+		if (res == -1 || res == 0)
+			return (res);
+		if (pfd[0].revents & POLLNVAL) {
+			errno = EBADF;
+			return (-1);
+		}
+		if ((pfd[0].revents & ev) == 0) {
+			errno = ETIMEDOUT;
+			return (-1);
+		}
+	}
+
+	ret = __sys_recvmsg(s, &msgvec[0].msg_hdr, flags);
+	if (ret == -1)
+		return (ret);
+
+	msgvec[0].msg_len = ret;
+
+	/* 
+	 * Do non-blocking receive for second and later messages if
+	 * WAITFORONE is set.
+	 */
+	if (flags & MSG_WAITFORONE)
+		flags |= MSG_DONTWAIT;
+
+	rcvd = 1;
+	for (i = rcvd; i < vlen; i++, rcvd++) {
+		ret = __sys_recvmsg(s, &msgvec[i].msg_hdr, flags);
+		if (ret == -1) {
+			/* We have received messages. Let caller know
+			 * about the data received, socket error is
+			 * returned on next invocation.
+			 */
+			return (rcvd);
+		}
+
+		/* Save received bytes. */
+		msgvec[i].msg_len = ret;
+	}
+
+	return (rcvd);
+}