1 | /* Copyright (C) 1991-2022 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, see |
16 | <https://www.gnu.org/licenses/>. */ |
17 | |
18 | #include <errno.h> |
19 | #include <unistd.h> |
20 | #include <stddef.h> |
21 | |
22 | /* Read NBYTES into BUF from FD. Return the number read or -1. */ |
23 | ssize_t |
24 | __libc_read (int fd, void *buf, size_t nbytes) |
25 | { |
26 | if (nbytes == 0) |
27 | return 0; |
28 | if (fd < 0) |
29 | { |
30 | __set_errno (EBADF); |
31 | return -1; |
32 | } |
33 | if (buf == NULL) |
34 | { |
35 | __set_errno (EINVAL); |
36 | return -1; |
37 | } |
38 | |
39 | __set_errno (ENOSYS); |
40 | return -1; |
41 | } |
42 | libc_hidden_def (__libc_read) |
43 | stub_warning (read) |
44 | |
45 | weak_alias (__libc_read, __read) |
46 | libc_hidden_weak (__read) |
47 | weak_alias (__libc_read, read) |
48 | libc_hidden_weak (read) |
49 | |