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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/tools/testing/selftests/cgroup/lib/include/cgroup_util.h
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/* SPDX-License-Identifier: GPL-2.0 */

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#include <stdbool.h>

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#include <stdlib.h>

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#ifndef PAGE_SIZE

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#define PAGE_SIZE 4096

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#endif

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#define MB(x) (x << 20)

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#define USEC_PER_SEC	1000000L

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#define NSEC_PER_SEC	1000000000L

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#define TEST_UID	65534 /* usually nobody, any !root is fine */

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#define CG_THREADS_FILE (!cg_test_v1_named ? "cgroup.threads" : "tasks")

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#define CG_NAMED_NAME "selftest"

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#define CG_PATH_FORMAT (!cg_test_v1_named ? "0::%s" : (":name=" CG_NAMED_NAME ":%s"))

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/*

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 * Checks if two given values differ by less than err% of their sum.

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 */

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static inline int values_close(long a, long b, int err)

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{

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	return labs(a - b) <= (a + b) / 100 * err;

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}

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extern ssize_t read_text(const char *path, char *buf, size_t max_len);

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extern ssize_t write_text(const char *path, char *buf, ssize_t len);

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extern int cg_find_controller_root(char *root, size_t len, const char *controller);

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extern int cg_find_unified_root(char *root, size_t len, bool *nsdelegate);

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extern char *cg_name(const char *root, const char *name);

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extern char *cg_name_indexed(const char *root, const char *name, int index);

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extern char *cg_control(const char *cgroup, const char *control);

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extern int cg_create(const char *cgroup);

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extern int cg_destroy(const char *cgroup);

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extern int cg_read(const char *cgroup, const char *control,

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		   char *buf, size_t len);

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extern int cg_read_strcmp(const char *cgroup, const char *control,

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			  const char *expected);

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extern int cg_read_strstr(const char *cgroup, const char *control,

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			  const char *needle);

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extern long cg_read_long(const char *cgroup, const char *control);

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extern long cg_read_long_fd(int fd);

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long cg_read_key_long(const char *cgroup, const char *control, const char *key);

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extern long cg_read_lc(const char *cgroup, const char *control);

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extern int cg_write(const char *cgroup, const char *control, char *buf);

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extern int cg_open(const char *cgroup, const char *control, int flags);

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int cg_write_numeric(const char *cgroup, const char *control, long value);

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extern int cg_run(const char *cgroup,

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		  int (*fn)(const char *cgroup, void *arg),

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		  void *arg);

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extern int cg_enter(const char *cgroup, int pid);

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extern int cg_enter_current(const char *cgroup);

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extern int cg_enter_current_thread(const char *cgroup);

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extern int cg_run_nowait(const char *cgroup,

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			 int (*fn)(const char *cgroup, void *arg),

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			 void *arg);

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extern int cg_wait_for_proc_count(const char *cgroup, int count);

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extern int cg_killall(const char *cgroup);

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int proc_mount_contains(const char *option);

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extern ssize_t proc_read_text(int pid, bool thread, const char *item, char *buf, size_t size);

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extern int proc_read_strstr(int pid, bool thread, const char *item, const char *needle);

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extern pid_t clone_into_cgroup(int cgroup_fd);

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extern int clone_reap(pid_t pid, int options);

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extern int clone_into_cgroup_run_wait(const char *cgroup);

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extern int dirfd_open_opath(const char *dir);

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extern int cg_prepare_for_wait(const char *cgroup);

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extern int memcg_prepare_for_wait(const char *cgroup);

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extern int cg_wait_for(int fd);

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extern bool cg_test_v1_named;

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