1/* SPDX-License-Identifier: GPL-2.0 */
 2#include <stdbool.h>
 3#include <stdlib.h>
 4
 5#include "../kselftest.h"
 6
 7#define PAGE_SIZE 4096
 8
 9#define MB(x) (x << 20)
10
11#define USEC_PER_SEC	1000000L
12#define NSEC_PER_SEC	1000000000L
13
14#define TEST_UID	65534 /* usually nobody, any !root is fine */
15
16/*
17 * Checks if two given values differ by less than err% of their sum.
18 */
19static inline int values_close(long a, long b, int err)
20{
21	return labs(a - b) <= (a + b) / 100 * err;
22}
23
24extern int cg_find_unified_root(char *root, size_t len, bool *nsdelegate);
25extern char *cg_name(const char *root, const char *name);
26extern char *cg_name_indexed(const char *root, const char *name, int index);
27extern char *cg_control(const char *cgroup, const char *control);
28extern int cg_create(const char *cgroup);
29extern int cg_destroy(const char *cgroup);
30extern int cg_read(const char *cgroup, const char *control,
31		   char *buf, size_t len);
32extern int cg_read_strcmp(const char *cgroup, const char *control,
33			  const char *expected);
34extern int cg_read_strstr(const char *cgroup, const char *control,
35			  const char *needle);
36extern long cg_read_long(const char *cgroup, const char *control);
37extern long cg_read_long_fd(int fd);
38long cg_read_key_long(const char *cgroup, const char *control, const char *key);
39extern long cg_read_lc(const char *cgroup, const char *control);
40extern int cg_write(const char *cgroup, const char *control, char *buf);
41extern int cg_open(const char *cgroup, const char *control, int flags);
42int cg_write_numeric(const char *cgroup, const char *control, long value);
43extern int cg_run(const char *cgroup,
44		  int (*fn)(const char *cgroup, void *arg),
45		  void *arg);
46extern int cg_enter(const char *cgroup, int pid);
47extern int cg_enter_current(const char *cgroup);
48extern int cg_enter_current_thread(const char *cgroup);
49extern int cg_run_nowait(const char *cgroup,
50			 int (*fn)(const char *cgroup, void *arg),
51			 void *arg);
52extern int get_temp_fd(void);
53extern int alloc_pagecache(int fd, size_t size);
54extern int alloc_anon(const char *cgroup, void *arg);
55extern int is_swap_enabled(void);
56extern int set_oom_adj_score(int pid, int score);
57extern int cg_wait_for_proc_count(const char *cgroup, int count);
58extern int cg_killall(const char *cgroup);
59int proc_mount_contains(const char *option);
60extern ssize_t proc_read_text(int pid, bool thread, const char *item, char *buf, size_t size);
61extern int proc_read_strstr(int pid, bool thread, const char *item, const char *needle);
62extern pid_t clone_into_cgroup(int cgroup_fd);
63extern int clone_reap(pid_t pid, int options);
64extern int clone_into_cgroup_run_wait(const char *cgroup);
65extern int dirfd_open_opath(const char *dir);
66extern int cg_prepare_for_wait(const char *cgroup);
67extern int memcg_prepare_for_wait(const char *cgroup);
68extern int cg_wait_for(int fd);