1 /* SPDX-License-Identifier: GPL-2.0 */
2 #include <stdbool.h>
3 #include <stdlib.h>
4
5 #ifndef BUF_SIZE
6 #define BUF_SIZE 4096
7 #endif
8
9 #define MB(x) (x << 20)
10 #define GB(x) ((unsigned long long)(x) << 30)
11
12 #define NSEC_PER_USEC 1000L
13 #define USEC_PER_SEC 1000000L
14 #define NSEC_PER_SEC 1000000000L
15
16 #define TEST_UID 65534 /* usually nobody, any !root is fine */
17
18 #define CG_THREADS_FILE (!cg_test_v1_named ? "cgroup.threads" : "tasks")
19 #define CG_NAMED_NAME "selftest"
20 #define CG_PATH_FORMAT (!cg_test_v1_named ? "0::%s" : (":name=" CG_NAMED_NAME ":%s"))
21
22 #define DEFAULT_WAIT_INTERVAL_US (100 * 1000) /* 100 ms */
23
24 /*
25 * Checks if two given values differ by less than err% of their sum.
26 */
values_close(long a,long b,int err)27 static inline int values_close(long a, long b, int err)
28 {
29 return labs(a - b) <= (a + b) / 100 * err;
30 }
31
32 /*
33 * Checks if two given values differ by less than err% of their sum and assert
34 * with detailed debug info if not.
35 */
values_close_report(long a,long b,int err)36 static inline int values_close_report(long a, long b, int err)
37 {
38 long diff = labs(a - b);
39 long limit = (a + b) / 100 * err;
40 double actual_err = (a + b) ? (100.0 * diff / (a + b)) : 0.0;
41 int close = diff <= limit;
42
43 if (!close)
44 fprintf(stderr,
45 "[FAIL] actual=%ld expected=%ld | diff=%ld | limit=%ld | "
46 "tolerance=%d%% | actual_error=%.2f%%\n",
47 a, b, diff, limit, err, actual_err);
48
49 return close;
50 }
51
52 extern ssize_t read_text(const char *path, char *buf, size_t max_len);
53 extern ssize_t write_text(const char *path, char *buf, ssize_t len);
54
55 extern int cg_find_controller_root(char *root, size_t len, const char *controller);
56 extern int cg_find_unified_root(char *root, size_t len, bool *nsdelegate);
57 extern char *cg_name(const char *root, const char *name);
58 extern char *cg_name_indexed(const char *root, const char *name, int index);
59 extern char *cg_control(const char *cgroup, const char *control);
60 extern int cg_create(const char *cgroup);
61 extern int cg_destroy(const char *cgroup);
62 extern int cg_read(const char *cgroup, const char *control,
63 char *buf, size_t len);
64 extern int cg_read_strcmp(const char *cgroup, const char *control,
65 const char *expected);
66 extern int cg_read_strcmp_wait(const char *cgroup, const char *control,
67 const char *expected);
68 extern int cg_read_strstr(const char *cgroup, const char *control,
69 const char *needle);
70 extern long cg_read_long(const char *cgroup, const char *control);
71 extern long cg_read_long_fd(int fd);
72 long cg_read_key_long(const char *cgroup, const char *control, const char *key);
73 long cg_read_key_long_poll(const char *cgroup, const char *control,
74 const char *key, long expected, int retries,
75 useconds_t wait_interval_us);
76 extern long cg_read_lc(const char *cgroup, const char *control);
77 extern int cg_write(const char *cgroup, const char *control, char *buf);
78 extern int cg_open(const char *cgroup, const char *control, int flags);
79 int cg_write_numeric(const char *cgroup, const char *control, long value);
80 extern int cg_run(const char *cgroup,
81 int (*fn)(const char *cgroup, void *arg),
82 void *arg);
83 extern int cg_enter(const char *cgroup, int pid);
84 extern int cg_enter_current(const char *cgroup);
85 extern int cg_enter_current_thread(const char *cgroup);
86 extern int cg_run_nowait(const char *cgroup,
87 int (*fn)(const char *cgroup, void *arg),
88 void *arg);
89 extern int cg_wait_for_proc_count(const char *cgroup, int count);
90 extern int cg_killall(const char *cgroup);
91 int proc_mount_contains(const char *option);
92 int cgroup_feature(const char *feature);
93 extern ssize_t proc_read_text(int pid, bool thread, const char *item, char *buf, size_t size);
94 extern int proc_read_strstr(int pid, bool thread, const char *item, const char *needle);
95 extern pid_t clone_into_cgroup(int cgroup_fd);
96 extern int clone_reap(pid_t pid, int options);
97 extern int clone_into_cgroup_run_wait(const char *cgroup);
98 extern int dirfd_open_opath(const char *dir);
99 extern int cg_prepare_for_wait(const char *cgroup);
100 extern int memcg_prepare_for_wait(const char *cgroup);
101 extern int cg_wait_for(int fd);
102 extern bool cg_test_v1_named;
103