1/* Copyright (C) 2005-2022 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 <fcntl.h>
20#include <stdarg.h>
21#include <stddef.h>
22#include <stdio.h>
23#include <sys/stat.h>
24#include <kernel-features.h>
25
26
27/* Open FILE with access OFLAG. Interpret relative paths relative to
28 the directory associated with FD. If O_CREAT or O_TMPFILE is in OFLAG, a
29 third argument is the file protection. */
30int
31__openat (int fd, const char *file, int oflag, ...)
32{
33 int mode;
34
35 if (file == NULL)
36 {
37 __set_errno (EINVAL);
38 return -1;
39 }
40
41 if (fd != AT_FDCWD && file[0] != '/')
42 {
43 /* Check FD is associated with a directory. */
44 struct stat64 st;
45 if (__fstat64 (fd, &st) != 0)
46 return -1;
47
48 if (!S_ISDIR (st.st_mode))
49 {
50 __set_errno (ENOTDIR);
51 return -1;
52 }
53 }
54
55 if (__OPEN_NEEDS_MODE (oflag))
56 {
57 va_list arg;
58 va_start (arg, oflag);
59 mode = va_arg (arg, int);
60 va_end (arg);
61
62 ignore_value (mode);
63 }
64
65 __set_errno (ENOSYS);
66 return -1;
67}
68libc_hidden_def (__openat)
69weak_alias (__openat, openat)
70stub_warning (openat)
71
72/* __openat_2 is a generic wrapper that calls __openat.
73 So give a stub warning for that symbol too. */
74stub_warning (__openat_2)
75

source code of glibc/io/openat.c