1/* Open an nss_files database file.
2 Copyright (C) 2020 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19#include <nss_files.h>
20
21#include <errno.h>
22#include <stdio_ext.h>
23
24FILE *
25__nss_files_fopen (const char *path)
26{
27 FILE *fp = fopen (path, "rce");
28 if (fp == NULL)
29 return NULL;
30
31 /* The stream is not shared across threads. */
32 __fsetlocking (fp, FSETLOCKING_BYCALLER);
33
34 /* This tells libio that the file is seekable, and that fp->_offset
35 is correct, ensuring that __ftello64 is efficient (bug 26257). */
36 if (__fseeko64 (fp, 0, SEEK_SET) < 0)
37 {
38 /* nss_files requires seekable files, to deal with repeated
39 reads of the same line after reporting ERANGE. */
40 fclose (fp);
41 __set_errno (ESPIPE);
42 return NULL;
43 }
44
45 return fp;
46}
47libc_hidden_def (__nss_files_fopen)
48