Update.
[glibc.git] / hurd / fd-read.c
blobd78cf5c17ec187638771b301cff012e795acfa7a
1 /* Copyright (C) 1993,94,95,97,99 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Library General Public License as
6 published by the Free Software Foundation; either version 2 of the
7 License, or (at your option) any later version.
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 Library General Public License for more details.
14 You should have received a copy of the GNU Library General Public
15 License along with the GNU C Library; see the file COPYING.LIB. If not,
16 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 Boston, MA 02111-1307, USA. */
19 #include <errno.h>
20 #include <unistd.h>
21 #include <hurd.h>
22 #include <hurd/fd.h>
23 #include <string.h>
25 error_t
26 _hurd_fd_read (struct hurd_fd *fd, void *buf, size_t *nbytes, off_t offset)
28 error_t err;
29 char *data;
30 mach_msg_type_number_t nread;
32 error_t readfd (io_t port)
34 return __io_read (port, &data, &nread, offset, *nbytes);
37 data = buf;
38 if (err = HURD_FD_PORT_USE (fd, _hurd_ctty_input (port, ctty, readfd)))
39 return err;
41 if (data != buf)
43 memcpy (buf, data, nread);
44 __vm_deallocate (__mach_task_self (), (vm_address_t) data, nread);
47 *nbytes = nread;
48 return 0;