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 #define DEFAULT_WAIT_INTERVAL_US (100 * 1000) /* 100 ms */
21
22 /*
23 * Checks if two given values differ by less than err% of their sum.
24 */
values_close(long a,long b,int err)25 static inline int values_close(long a, long b, int err)
26 {
27 return labs(a - b) <= (a + b) / 100 * err;
28 }
29
30 /*
31 * Checks if two given values differ by less than err% of their sum and assert
32 * with detailed debug info if not.
33 */
values_close_report(long a,long b,int err)34 static inline int values_close_report(long a, long b, int err)
35 {
36 long diff = labs(a - b);
37 long limit = (a + b) / 100 * err;
38 double actual_err = (a + b) ? (100.0 * diff / (a + b)) : 0.0;
39 int close = diff <= limit;
40
41 if (!close)
42 fprintf(stderr,
43 "[FAIL] actual=%ld expected=%ld | diff=%ld | limit=%ld | "
44 "tolerance=%d%% | actual_error=%.2f%%\n",
45 a, b, diff, limit, err, actual_err);
46
47 return close;
48 }
49
50 extern ssize_t read_text(const char *path, char *buf, size_t max_len);
51 extern ssize_t write_text(const char *path, char *buf, ssize_t len);
52
53 extern int cg_find_controller_root(char *root, size_t len, const char *controller);
54 extern int cg_find_unified_root(char *root, size_t len, bool *nsdelegate);
55 extern char *cg_name(const char *root, const char *name);
56 extern char *cg_name_indexed(const char *root, const char *name, int index);
57 extern char *cg_control(const char *cgroup, const char *control);
58 extern int cg_create(const char *cgroup);
59 extern int cg_destroy(const char *cgroup);
60 extern int cg_read(const char *cgroup, const char *control,
61 char *buf, size_t len);
62 extern int cg_read_strcmp(const char *cgroup, const char *control,
63 const char *expected);
64 extern int cg_read_strcmp_wait(const char *cgroup, const char *control,
65 const char *expected);
66 extern int cg_read_strstr(const char *cgroup, const char *control,
67 const char *needle);
68 extern long cg_read_long(const char *cgroup, const char *control);
69 extern long cg_read_long_fd(int fd);
70 long cg_read_key_long(const char *cgroup, const char *control, const char *key);
71 long cg_read_key_long_poll(const char *cgroup, const char *control,
72 const char *key, long expected, int retries,
73 useconds_t wait_interval_us);
74 extern long cg_read_lc(const char *cgroup, const char *control);
75 extern int cg_write(const char *cgroup, const char *control, char *buf);
76 extern int cg_open(const char *cgroup, const char *control, int flags);
77 int cg_write_numeric(const char *cgroup, const char *control, long value);
78 extern int cg_run(const char *cgroup,
79 int (*fn)(const char *cgroup, void *arg),
80 void *arg);
81 extern int cg_enter(const char *cgroup, int pid);
82 extern int cg_enter_current(const char *cgroup);
83 extern int cg_enter_current_thread(const char *cgroup);
84 extern int cg_run_nowait(const char *cgroup,
85 int (*fn)(const char *cgroup, void *arg),
86 void *arg);
87 extern int cg_wait_for_proc_count(const char *cgroup, int count);
88 extern int cg_killall(const char *cgroup);
89 int proc_mount_contains(const char *option);
90 int cgroup_feature(const char *feature);
91 extern ssize_t proc_read_text(int pid, bool thread, const char *item, char *buf, size_t size);
92 extern int proc_read_strstr(int pid, bool thread, const char *item, const char *needle);
93 extern pid_t clone_into_cgroup(int cgroup_fd);
94 extern int clone_reap(pid_t pid, int options);
95 extern int clone_into_cgroup_run_wait(const char *cgroup);
96 extern int dirfd_open_opath(const char *dir);
97 extern int cg_prepare_for_wait(const char *cgroup);
98 extern int memcg_prepare_for_wait(const char *cgroup);
99 extern int cg_wait_for(int fd);
100 extern bool cg_test_v1_named;
101