libio: Add rtems_libio_iop_is_readable()

Update #3132.

c/src/lib/libbsp/shared/console.c

@@ -255,7 +255,7 @@ rtems_device_driver console_open(
     }
   }
 
-  if ( (args->iop->flags&LIBIO_FLAGS_READ) &&
+  if (rtems_libio_iop_is_readable(args->iop) &&
       cptr->pDeviceFlow &&
       cptr->pDeviceFlow->deviceStartRemoteTx) {
     cptr->pDeviceFlow->deviceStartRemoteTx(minor);
@@ -288,7 +288,7 @@ rtems_device_driver console_close(
    * Stop only if it's the last one opened.
    */
   if ( (current_tty->refcount == 1) ) {
-    if ( (args->iop->flags&LIBIO_FLAGS_READ) &&
+    if (rtems_libio_iop_is_readable(args->iop) &&
           cptr->pDeviceFlow &&
           cptr->pDeviceFlow->deviceStopRemoteTx) {
       cptr->pDeviceFlow->deviceStopRemoteTx(minor);

cpukit/libcsupport/include/rtems/libio.h

@@ -1389,6 +1389,16 @@ static inline bool rtems_libio_iop_is_no_delay( const rtems_libio_t *iop )
   return ( rtems_libio_iop_flags( iop ) & LIBIO_FLAGS_NO_DELAY ) != 0;
 }
 
+/**
+ * @brief Returns true if this is a readable iop, otherwise returns false.
+ *
+ * @param[in] iop The iop.
+ */
+static inline bool rtems_libio_iop_is_readable( const rtems_libio_t *iop )
+{
+  return ( rtems_libio_iop_flags( iop ) & LIBIO_FLAGS_READ ) != 0;
+}
+
 /**
  * @name External I/O Handlers
  */

cpukit/libnetworking/lib/ftpfs.c

@@ -1037,7 +1037,7 @@ static int rtems_ftpfs_open(
   /* Check for either read-only or write-only flags */
   if (
     (iop->flags & LIBIO_FLAGS_WRITE) != 0
-      && (iop->flags & LIBIO_FLAGS_READ) != 0
+      && rtems_libio_iop_is_readable(iop)
   ) {
     eno = ENOTSUP;
   }