winsup/cygwin/fhandler/zero.cc

   1 /* fhandler_dev_zero.cc: code to access /dev/zero
   2
   3    Written by DJ Delorie (dj@cygnus.com)
   4
   5 This file is part of Cygwin.
   6
   7 This software is a copyrighted work licensed under the terms of the
   8 Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
   9 details. */
  10
  11 #include "winsup.h"
  12 #include "security.h"
  13 #include "cygerrno.h"
  14 #include "path.h"
  15 #include "fhandler.h"
  16
  17 fhandler_dev_zero::fhandler_dev_zero ()
  18   : fhandler_base ()
  19 {
  20 }
  21
  22 ssize_t
  23 fhandler_dev_zero::write (const void *, size_t len)
  24 {
  25   if (get_device () == FH_FULL)
  26     {
  27       set_errno (ENOSPC);
  28       return -1;
  29     }
  30   return len;
  31 }
  32
  33 void
  34 fhandler_dev_zero::read (void *ptr, size_t& len)
  35 {
  36   memset (ptr, 0, len);
  37 }