libc: timex, socket_fs_recvmsg and sendmsg

- Added timex.h as provided header file
- implementation of socket_fs_recvmsg
- implementation of sendmsg

Changes needed for chrony port.

Issue #4526

repos/libports/lib/mk/libc-net.mk

@@ -15,6 +15,9 @@ SRC_C += gethostnamadr.c gethostbydns.c gethostbyht.c map_v4v6.c
 # needed for getprotobyname()
 SRC_C += getprotoent.c getprotoname.c
 
+# needed by send()
+SRC_C += sendmsg.c
+
 # defines in6addr_any
 SRC_C += vars.c
 
@@ -53,4 +56,7 @@ nsparser.c: nsparser.y
 
 vpath nsparser.y $(LIBC_NET_DIR)
 
+vpath sendmsg.c $(REP_DIR)/src/lib/libc
+
 CC_CXX_WARN_STRICT =
+

repos/libports/ports/libc.hash

@@ -1 +1 @@
-c7cd230b11ca71979f32950803bc78b45adfa0ce
+b856473bd43dea76e963f35bdbdd1d49d2d70e6b

repos/libports/ports/libc.port

@@ -129,7 +129,7 @@ DIR_CONTENT(include/libc/sys) := \
                 utsname.h elf.h mtio.h _stdint.h atomic_common.h _ucontext.h \
                 _cpuset.h _bitset.h bitset.h _stdarg.h _uio.h auxv.h random.h \
                 _sockaddr_storage.h termios.h _termios.h _umtx.h kerneldump.h \
-                conf.h disk_zone.h counter.h soundcard.h pciio.h)
+                conf.h disk_zone.h counter.h soundcard.h pciio.h timex.h)
 
 DIRS += include/libc/sys/disk
 DIR_CONTENT(include/libc/sys/disk) := $(D)/sys/sys/disk/*h

repos/libports/src/lib/libc/sendmsg.c

@@ -0,0 +1,76 @@
+/*
+ * Copyright (c) 1995, 1996, 1997, 1998, 1999 Kungliga Tekniska Högskolan
+ * (Royal Institute of Technology, Stockholm, Sweden).
+ * 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, this list of conditions and the following disclaimer.
+ * 
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 
+ * 3. Neither the name of the Institute nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``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 INSTITUTE OR CONTRIBUTORS 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.
+ */
+
+ /*
+  * NOTE: @author : Aditya Kousik
+  *       @email  : adit267.kousik@gmail.com
+  *
+  *       This implementation is for the libc-net port of Genode
+  *
+  */
+
+#include <sys/cdefs.h>
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/uio.h>
+
+#include <stdlib.h>
+#include <string.h>
+
+#include <stddef.h>
+
+ssize_t sendmsg(int s, const struct msghdr *msg, int flags)
+{
+	ssize_t ret;
+	size_t tot = 0;
+	int i;
+	char *buf, *p;
+	struct iovec *iov = msg->msg_iov;
+
+	for(i = 0; i < msg->msg_iovlen; ++i)
+		tot += iov[i].iov_len;
+	buf = malloc(tot);
+	if (tot != 0 && buf == NULL) {
+		//errno = ENOMEM;
+		return -1;
+	}
+	p = buf;
+	for (i = 0; i < msg->msg_iovlen; ++i) {
+		memcpy (p, iov[i].iov_base, iov[i].iov_len);
+		p += iov[i].iov_len;
+	}
+	ret = _sendto(s, buf, tot, flags, msg->msg_name, msg->msg_namelen);
+	free (buf);
+	return ret;
+}

repos/libports/src/lib/libc/socket_fs_plugin.cc

@@ -632,7 +632,7 @@ extern "C" int socket_fs_bind(int libc_fd, sockaddr const *addr, socklen_t addrl
 	if (!addr) return Errno(EFAULT);
 
 	if (addr->sa_family != AF_INET) {
-		error(__func__, ": family not supported");
+		error(__func__, ": family ", addr->sa_family, " not supported");
 		return Errno(EAFNOSUPPORT);
 	}
 
@@ -842,8 +842,77 @@ extern "C" ssize_t socket_fs_recv(int libc_fd, void *buf, ::size_t len, int flag
 
 extern "C" ssize_t socket_fs_recvmsg(int libc_fd, msghdr *msg, int flags)
 {
-	warning("##########  TODO  ########## ", __func__);
-	return 0;
+	/* TODO just a simple implementation that handles the easy cases */
+	size_t numberOfBytes = 0;
+	char *data = nullptr;
+	size_t length = 0;
+	size_t i;
+	char *buffer;
+	ssize_t res;
+	size_t amount;
+	socklen_t client_address_len;
+
+	/* iterate over all msg_iov to get the number of bytes that have to be read. */
+	for (i = 0; i < msg->msg_iovlen; i++) {
+		numberOfBytes += msg->msg_iov[i].iov_len;
+		/* As an optimization, we set the initial values of DATA and LEN
+			from the first non-empty iovec. This kicks-in in the case
+			where the whole packet fits into the first iovec buffer. */
+		if (data == nullptr && msg->msg_iov[i].iov_len > 0) {
+			data = (char*)msg->msg_iov[i].iov_base;
+			length = msg->msg_iov[i].iov_len;
+		}
+	}
+
+	buffer = data;
+
+	struct sockaddr_in client_address;
+	client_address_len = sizeof (client_address);
+
+	/* do socket communication */
+	res = socket_fs_recvfrom(libc_fd, buffer, length, flags,
+	                         (struct sockaddr *) &client_address,
+	                         &client_address_len);
+
+	if(res < 0) {
+		return res;
+	}
+
+	/* copy client address to msg_name */
+	if (msg->msg_name != nullptr && client_address_len > 0) {
+		if (msg->msg_namelen > client_address_len) {
+			msg->msg_namelen = client_address_len;
+		}
+
+		::memcpy (msg->msg_name, &client_address, msg->msg_namelen);
+	} else if (msg->msg_name != nullptr) {
+		msg->msg_namelen = 0;
+	}
+
+	/* handle payload */
+	if (buffer == data) {
+		buffer += length;
+	} else {
+		amount = length;
+		buffer = data;
+		for (i = 0; i < msg->msg_iovlen; i++) {
+#define min(a, b)        ((a) > (b) ? (b) : (a))
+			size_t copy = min (msg->msg_iov[i].iov_len, amount);
+			::memcpy (msg->msg_iov[i].iov_base, buffer, copy);
+			buffer += copy;
+			amount -= copy;
+			if (length == 0)
+				break;
+		}
+
+		Libc::Allocator alloc { };
+		destroy(alloc, data);
+	}
+
+	/* handle control data, not supported yet */
+	msg->msg_controllen = 0;
+
+	return res;
 }
 
 
@@ -1150,6 +1219,11 @@ int Socket_fs::Plugin::fcntl(File_descriptor *fd, int cmd, long arg)
 	if (!context) return Errno(EBADF);
 
 	switch (cmd) {
+	case F_GETFD:
+		return context->fd_flags();
+	case F_SETFD:
+		context->fd_flags(arg);
+		return 0;
 	case F_GETFL:
 		return context->fd_flags() | O_RDWR;
 	case F_SETFL: