Added Unix Implementation for sendto and recvfrom

Added omrsock_sendto and omrsock_recvfrom unix implementation

- Both functions uses function calls to system sendto and recvfrom
  socket api functions.
- Both functions checks for invalid arguments and saves errno using
  set_last_error and returns the bytes sent/received.
- recvfrom function can take NULL for addrHandle argument when user
  does not want to know who the message was from.

Issue: eclipse-omr#5128

Signed-off-by: Haley Cao <haleycao88@hotmail.com>

include_core/omrporterror.h

@@ -335,10 +335,12 @@
 #define OMRPORT_ERROR_SOCK_ACCEPT_FAILED (OMRPORT_ERROR_SOCK_BASE - 10)
 #define OMRPORT_ERROR_SOCK_SEND_FAILED (OMRPORT_ERROR_SOCK_BASE - 11)
 #define OMRPORT_ERROR_SOCK_RECV_FAILED (OMRPORT_ERROR_SOCK_BASE - 12)
-#define OMRPORT_ERROR_SOCK_LEVEL_UNSUPPORTED (OMRPORT_ERROR_SOCK_BASE - 13)
-#define OMRPORT_ERROR_SOCK_OPTION_UNSUPPORTED (OMRPORT_ERROR_SOCK_BASE - 14)
-#define OMRPORT_ERROR_SOCK_SETSOCKOPT_FAILED (OMRPORT_ERROR_SOCK_BASE - 15)
-#define OMRPORT_ERROR_SOCK_GETSOCKOPT_FAILED (OMRPORT_ERROR_SOCK_BASE - 16)
+#define OMRPORT_ERROR_SOCK_SENDTO_FAILED (OMRPORT_ERROR_SOCK_BASE - 13)
+#define OMRPORT_ERROR_SOCK_RECVFROM_FAILED (OMRPORT_ERROR_SOCK_BASE - 14)
+#define OMRPORT_ERROR_SOCK_LEVEL_UNSUPPORTED (OMRPORT_ERROR_SOCK_BASE - 15)
+#define OMRPORT_ERROR_SOCK_OPTION_UNSUPPORTED (OMRPORT_ERROR_SOCK_BASE - 16)
+#define OMRPORT_ERROR_SOCK_SETSOCKOPT_FAILED (OMRPORT_ERROR_SOCK_BASE - 17)
+#define OMRPORT_ERROR_SOCK_GETSOCKOPT_FAILED (OMRPORT_ERROR_SOCK_BASE - 18)
 /**
  * @}
  */

port/unix/omrsock.c

@@ -634,7 +634,31 @@ omrsock_send(struct OMRPortLibrary *portLibrary, omrsock_socket_t sock, uint8_t
 int32_t
 omrsock_sendto(struct OMRPortLibrary *portLibrary, omrsock_socket_t sock, uint8_t *buf, int32_t nbyte, int32_t flags, omrsock_sockaddr_t addrHandle)
 {
-	return OMRPORT_ERROR_NOT_SUPPORTED_ON_THIS_PLATFORM;
+
+	int32_t bytesSent = 0;
+	socklen_t addrLength = 0;
+	int32_t err;
+
+	if (NULL == sock || 0 >= nbyte || NULL == addrHandle) {
+		return OMRPORT_ERROR_INVALID_ARGUMENTS;
+	}
+
+	if (OS_SOCK_AF_INET == (addrHandle->data).ss_family) {
+		addrLength = sizeof(omr_os_sockaddr_in);
+	}
+	else {
+		addrLength = sizeof(omr_os_sockaddr_in6);
+	}
+
+	bytesSent = sendto(sock->data, buf, nbyte, flags, (omr_os_sockaddr *)&addrHandle->data, addrLength);
+
+	if (-1 == bytesSent) {
+		err = errno;
+		portLibrary->error_set_last_error(portLibrary, err, OMRPORT_ERROR_SOCK_SENDTO_FAILED);
+		return OMRPORT_ERROR_SOCK_SENDTO_FAILED;
+	}
+
+	return bytesSent;
 }
 
 int32_t
@@ -658,7 +682,26 @@ omrsock_recv(struct OMRPortLibrary *portLibrary, omrsock_socket_t sock, uint8_t
 int32_t
 omrsock_recvfrom(struct OMRPortLibrary *portLibrary, omrsock_socket_t sock, uint8_t *buf, int32_t nbyte, int32_t flags, omrsock_sockaddr_t addrHandle)
 {
-	return OMRPORT_ERROR_NOT_SUPPORTED_ON_THIS_PLATFORM;
+	int32_t bytesRecv = 0;
+	socklen_t addrlen = 0;
+
+	if (NULL == sock || 0 >= nbyte) {
+		return OMRPORT_ERROR_INVALID_ARGUMENTS;
+	}
+
+	if (NULL == addrHandle) {
+		/* If addrHandle is NULL, the source address will not be filled in by recvfrom call. */
+		bytesRecv = recvfrom(sock->data, buf, nbyte, flags, NULL, NULL);
+	} else {
+		addrlen = sizeof(omr_os_sockaddr_storage);
+		bytesRecv = recvfrom(sock->data, buf, nbyte, flags, (struct sockaddr*)&addrHandle->data, &addrlen);
+	}
+	if (-1 == bytesRecv) {
+		portLibrary->error_set_last_error(portLibrary, errno, OMRPORT_ERROR_SOCK_RECVFROM_FAILED);
+		return OMRPORT_ERROR_SOCK_RECVFROM_FAILED;
+	}
+
+	return bytesRecv;
 }
 
 int32_t