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