tools/testing/selftests/cgroup/cgroup_util.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #include <stdbool.h>
   3 #include <stdlib.h>
   4
   5 #define PAGE_SIZE 4096
   6
   7 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
   8
   9 #define MB(x) (x << 20)
  10
  11 /*
  12  * Checks if two given values differ by less than err% of their sum.
  13  */
  14 static inline int values_close(long a, long b, int err)
  15 {
  16         return abs(a - b) <= (a + b) / 100 * err;
  17 }
  18
  19 extern int cg_find_unified_root(char *root, size_t len);
  20 extern char *cg_name(const char *root, const char *name);
  21 extern char *cg_name_indexed(const char *root, const char *name, int index);
  22 extern char *cg_control(const char *cgroup, const char *control);
  23 extern int cg_create(const char *cgroup);
  24 extern int cg_destroy(const char *cgroup);
  25 extern int cg_read(const char *cgroup, const char *control,
  26                    char *buf, size_t len);
  27 extern int cg_read_strcmp(const char *cgroup, const char *control,
  28                           const char *expected);
  29 extern int cg_read_strstr(const char *cgroup, const char *control,
  30                           const char *needle);
  31 extern long cg_read_long(const char *cgroup, const char *control);
  32 long cg_read_key_long(const char *cgroup, const char *control, const char *key);
  33 extern long cg_read_lc(const char *cgroup, const char *control);
  34 extern int cg_write(const char *cgroup, const char *control, char *buf);
  35 extern int cg_run(const char *cgroup,
  36                   int (*fn)(const char *cgroup, void *arg),
  37                   void *arg);
  38 extern int cg_enter(const char *cgroup, int pid);
  39 extern int cg_enter_current(const char *cgroup);
  40 extern int cg_enter_current_thread(const char *cgroup);
  41 extern int cg_run_nowait(const char *cgroup,
  42                          int (*fn)(const char *cgroup, void *arg),
  43                          void *arg);
  44 extern int get_temp_fd(void);
  45 extern int alloc_pagecache(int fd, size_t size);
  46 extern int alloc_anon(const char *cgroup, void *arg);
  47 extern int is_swap_enabled(void);
  48 extern int set_oom_adj_score(int pid, int score);
  49 extern int cg_wait_for_proc_count(const char *cgroup, int count);
  50 extern int cg_killall(const char *cgroup);
  51 extern ssize_t proc_read_text(int pid, bool thread, const char *item, char *buf, size_t size);
  52 extern int proc_read_strstr(int pid, bool thread, const char *item, const char *needle);
  53 extern pid_t clone_into_cgroup(int cgroup_fd);
  54 extern int clone_reap(pid_t pid, int options);
  55 extern int clone_into_cgroup_run_wait(const char *cgroup);
  56 extern int dirfd_open_opath(const char *dir);