* Makefile.in: Add fhandler_mem.o to the dependencies.

* dtable.cc (dtable::build_fhandler): Add case for FH_MEM.
        * fhandler.h: Add FH_MEM device type.  Add class fhandler_dev_mem.
        * fhandler_mem.cc: New file. Implementation of class fhandler_dev_mem.
        * path.cc: Add /dev/mem to windows_device_names.
        (get_device_number): Add FH_MEM type.

winsup/cygwin/dtable.cc

@@ -296,6 +296,9 @@ dtable::build_fhandler (int fd, DWORD dev, const char *name, int unit)
       case FH_RANDOM:
 	fh = new (buf) fhandler_dev_random (name, unit);
 	break;
+      case FH_MEM:
+	fh = new (buf) fhandler_dev_mem (name, unit);
+	break;
       default:
 	/* FIXME - this could recurse forever */
 	return build_fhandler (fd, name, NULL);