1 /*
2 * Copyright (c) 2017 Xiao Yang <yangx.jy@cn.fujitsu.com>
3 *
4 * This program is free software: you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program 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
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <http://www.gnu.org/licenses/>.
16 */
17
18 #ifndef SPLICE_H__
19 #define SPLICE_H__
20
21 #include <unistd.h>
22 #include "tst_safe_file_ops.h"
23 #include "tst_minmax.h"
24
get_max_limit(int default_len_data)25 static inline int get_max_limit(int default_len_data)
26 {
27 int pipe_max_unpriv;
28
29 if (!access("/proc/sys/fs/pipe-max-size", F_OK)) {
30 SAFE_FILE_SCANF("/proc/sys/fs/pipe-max-size", "%d", &pipe_max_unpriv);
31 return MIN(pipe_max_unpriv, default_len_data);
32 }
33
34 if (!access("/proc/sys/fs/pipe-max-pages", F_OK)) {
35 SAFE_FILE_SCANF("/proc/sys/fs/pipe-max-pages", "%d", &pipe_max_unpriv);
36 return MIN(pipe_max_unpriv * getpagesize(), default_len_data);
37 }
38
39 return default_len_data;
40 }
41
42 #endif /* SPLICE_H__ */
43