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04277e02 | 1 | /* Copyright (C) 1993-2019 Free Software Foundation, Inc. |
c84142e8 UD |
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 | |
41bdb6e2 AJ |
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. | |
c84142e8 UD |
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 | |
41bdb6e2 | 12 | Lesser General Public License for more details. |
c84142e8 | 13 | |
41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 15 | License along with the GNU C Library; if not, see |
5a82c748 | 16 | <https://www.gnu.org/licenses/>. */ |
28f540f4 RM |
17 | |
18 | #include <errno.h> | |
19 | #include <unistd.h> | |
20 | #include <hurd.h> | |
21 | #include <hurd/fd.h> | |
22 | #include <string.h> | |
23 | ||
24 | error_t | |
337738b7 | 25 | _hurd_fd_read (struct hurd_fd *fd, void *buf, size_t *nbytes, loff_t offset) |
28f540f4 RM |
26 | { |
27 | error_t err; | |
28 | char *data; | |
29 | mach_msg_type_number_t nread; | |
30 | ||
31 | error_t readfd (io_t port) | |
32 | { | |
8b2134db | 33 | return __io_read (port, &data, &nread, offset, *nbytes); |
28f540f4 RM |
34 | } |
35 | ||
36 | data = buf; | |
d5a0160b | 37 | nread = *nbytes; |
28f540f4 RM |
38 | if (err = HURD_FD_PORT_USE (fd, _hurd_ctty_input (port, ctty, readfd))) |
39 | return err; | |
40 | ||
41 | if (data != buf) | |
42 | { | |
2e806440 | 43 | if (nread > *nbytes) /* Sanity check for bogus server. */ |
7385c04c RM |
44 | { |
45 | __vm_deallocate (__mach_task_self (), (vm_address_t) data, nread); | |
46 | return EGRATUITOUS; | |
47 | } | |
28f540f4 RM |
48 | memcpy (buf, data, nread); |
49 | __vm_deallocate (__mach_task_self (), (vm_address_t) data, nread); | |
50 | } | |
51 | ||
52 | *nbytes = nread; | |
53 | return 0; | |
54 | } |