1: /* Copyright (C) 1993,94,95,97,99,2002 Free Software Foundation, Inc.
    2:    This file is part of the GNU C Library.
    3: 
    4:    The GNU C Library is free software; you can redistribute it and/or
    5:    modify it under the terms of the GNU Lesser General Public
    6:    License as published by the Free Software Foundation; either
    7:    version 2.1 of the License, or (at your option) any later version.
    8: 
    9:    The GNU C Library is distributed in the hope that it will be useful,
   10:    but WITHOUT ANY WARRANTY; without even the implied warranty of
   11:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   12:    Lesser General Public License for more details.
   13: 
   14:    You should have received a copy of the GNU Lesser General Public
   15:    License along with the GNU C Library; if not, write to the Free
   16:    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   17:    02111-1307 USA.  */
   18: 
   19: #include <errno.h>
   20: #include <unistd.h>
   21: #include <hurd.h>
   22: #include <hurd/fd.h>
   23: #include <string.h>
   24: 
   25: error_t
   26: _hurd_fd_read (struct hurd_fd *fd, void *buf, size_t *nbytes, loff_t offset)
   27: {
   28:   error_t err;
   29:   char *data;
   30:   mach_msg_type_number_t nread;
   31: 
   32:   error_t readfd (io_t port)
   33:     {
   34:       return __io_read (port, &data, &nread, offset, *nbytes);
   35:     }
   36: 
   37:   data = buf;
   38:   if (err = HURD_FD_PORT_USE (fd, _hurd_ctty_input (port, ctty, readfd)))
   39:     return err;
   40: 
   41:   if (data != buf)
   42:     {
   43:       memcpy (buf, data, nread);
   44:       __vm_deallocate (__mach_task_self (), (vm_address_t) data, nread);
   45:     }
   46: 
   47:   *nbytes = nread;
   48:   return 0;
   49: }