1 /* SPDX-License-Identifier: GPL-2.0 */
2 #include <stdlib.h>
3 
4 #define PAGE_SIZE 4096
5 
6 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
7 
8 #define MB(x) (x << 20)
9 
10 /*
11  * Checks if two given values differ by less than err% of their sum.
12  */
13 static inline int values_close(long a, long b, int err)
14 {
15 	return abs(a - b) <= (a + b) / 100 * err;
16 }
17 
18 extern int cg_find_unified_root(char *root, size_t len);
19 extern char *cg_name(const char *root, const char *name);
20 extern char *cg_name_indexed(const char *root, const char *name, int index);
21 extern int cg_create(const char *cgroup);
22 extern int cg_destroy(const char *cgroup);
23 extern int cg_read(const char *cgroup, const char *control,
24 		   char *buf, size_t len);
25 extern int cg_read_strcmp(const char *cgroup, const char *control,
26 			  const char *expected);
27 extern int cg_read_strstr(const char *cgroup, const char *control,
28 			  const char *needle);
29 extern long cg_read_long(const char *cgroup, const char *control);
30 long cg_read_key_long(const char *cgroup, const char *control, const char *key);
31 extern int cg_write(const char *cgroup, const char *control, char *buf);
32 extern int cg_run(const char *cgroup,
33 		  int (*fn)(const char *cgroup, void *arg),
34 		  void *arg);
35 extern int cg_enter_current(const char *cgroup);
36 extern int cg_run_nowait(const char *cgroup,
37 			 int (*fn)(const char *cgroup, void *arg),
38 			 void *arg);
39 extern int get_temp_fd(void);
40 extern int alloc_pagecache(int fd, size_t size);
41 extern int alloc_anon(const char *cgroup, void *arg);
42 extern int is_swap_enabled(void);
43