tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/* SPDX-License-Identifier: GPL-2.0 */
2#include <stdbool.h>
3#include <stdlib.h>
4
5#ifndef PAGE_SIZE
6#define PAGE_SIZE 4096
7#endif
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#define CG_THREADS_FILE (!cg_test_v1_named ? "cgroup.threads" : "tasks")
17#define CG_NAMED_NAME "selftest"
18#define CG_PATH_FORMAT (!cg_test_v1_named ? "0::%s" : (":name=" CG_NAMED_NAME ":%s"))
19
20/*
21 * Checks if two given values differ by less than err% of their sum.
22 */
23static inline int values_close(long a, long b, int err)
24{
25 return labs(a - b) <= (a + b) / 100 * err;
26}
27
28/*
29 * Checks if two given values differ by less than err% of their sum and assert
30 * with detailed debug info if not.
31 */
32static inline int values_close_report(long a, long b, int err)
33{
34 long diff = labs(a - b);
35 long limit = (a + b) / 100 * err;
36 double actual_err = (a + b) ? (100.0 * diff / (a + b)) : 0.0;
37 int close = diff <= limit;
38
39 if (!close)
40 fprintf(stderr,
41 "[FAIL] actual=%ld expected=%ld | diff=%ld | limit=%ld | "
42 "tolerance=%d%% | actual_error=%.2f%%\n",
43 a, b, diff, limit, err, actual_err);
44
45 return close;
46}
47
48extern ssize_t read_text(const char *path, char *buf, size_t max_len);
49extern ssize_t write_text(const char *path, char *buf, ssize_t len);
50
51extern int cg_find_controller_root(char *root, size_t len, const char *controller);
52extern int cg_find_unified_root(char *root, size_t len, bool *nsdelegate);
53extern char *cg_name(const char *root, const char *name);
54extern char *cg_name_indexed(const char *root, const char *name, int index);
55extern char *cg_control(const char *cgroup, const char *control);
56extern int cg_create(const char *cgroup);
57extern int cg_destroy(const char *cgroup);
58extern int cg_read(const char *cgroup, const char *control,
59 char *buf, size_t len);
60extern int cg_read_strcmp(const char *cgroup, const char *control,
61 const char *expected);
62extern int cg_read_strstr(const char *cgroup, const char *control,
63 const char *needle);
64extern long cg_read_long(const char *cgroup, const char *control);
65extern long cg_read_long_fd(int fd);
66long cg_read_key_long(const char *cgroup, const char *control, const char *key);
67extern long cg_read_lc(const char *cgroup, const char *control);
68extern int cg_write(const char *cgroup, const char *control, char *buf);
69extern int cg_open(const char *cgroup, const char *control, int flags);
70int cg_write_numeric(const char *cgroup, const char *control, long value);
71extern int cg_run(const char *cgroup,
72 int (*fn)(const char *cgroup, void *arg),
73 void *arg);
74extern int cg_enter(const char *cgroup, int pid);
75extern int cg_enter_current(const char *cgroup);
76extern int cg_enter_current_thread(const char *cgroup);
77extern int cg_run_nowait(const char *cgroup,
78 int (*fn)(const char *cgroup, void *arg),
79 void *arg);
80extern int cg_wait_for_proc_count(const char *cgroup, int count);
81extern int cg_killall(const char *cgroup);
82int proc_mount_contains(const char *option);
83int cgroup_feature(const char *feature);
84extern ssize_t proc_read_text(int pid, bool thread, const char *item, char *buf, size_t size);
85extern int proc_read_strstr(int pid, bool thread, const char *item, const char *needle);
86extern pid_t clone_into_cgroup(int cgroup_fd);
87extern int clone_reap(pid_t pid, int options);
88extern int clone_into_cgroup_run_wait(const char *cgroup);
89extern int dirfd_open_opath(const char *dir);
90extern int cg_prepare_for_wait(const char *cgroup);
91extern int memcg_prepare_for_wait(const char *cgroup);
92extern int cg_wait_for(int fd);
93extern bool cg_test_v1_named;