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
__libc_read(int fd,void * buf,size_t nbytes)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