Commit 2a42461a authored by Hou Tao's avatar Hou Tao Committed by Daniel Borkmann
Browse files

selftests/bpf: Add cgroup helper remove_cgroup() 



Add remove_cgroup() to remove a cgroup which doesn't have any children
or live processes. It will be used by the following patch to test cgroup
iterator on a dead cgroup.

Signed-off-by: default avatarHou Tao <houtao1@huawei.com>
Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
Acked-by: default avatarYonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20221121073440.1828292-3-houtao@huaweicloud.com
parent 1a5160d4

tools/testing/selftests/bpf/cgroup_helpers.c

+19 −0
Original line number Diff line number Diff line
@@ -333,6 +333,25 @@ int get_root_cgroup(void) 
	return fd;

}



/*

 * remove_cgroup() - Remove a cgroup

 * @relative_path: The cgroup path, relative to the workdir, to remove

 *

 * This function expects a cgroup to already be created, relative to the cgroup

 * work dir. It also expects the cgroup doesn't have any children or live

 * processes and it removes the cgroup.

 *

 * On failure, it will print an error to stderr.

 */

void remove_cgroup(const char *relative_path)

{

	char cgroup_path[PATH_MAX + 1];



	format_cgroup_path(cgroup_path, relative_path);

	if (rmdir(cgroup_path))

		log_err("rmdiring cgroup %s .. %s", relative_path, cgroup_path);

}



/**

 * create_and_get_cgroup() - Create a cgroup, relative to workdir, and get the FD

 * @relative_path: The cgroup path, relative to the workdir, to join

tools/testing/selftests/bpf/cgroup_helpers.h

+1 −0
Original line number Diff line number Diff line
@@ -18,6 +18,7 @@ int write_cgroup_file_parent(const char *relative_path, const char *file, 
int cgroup_setup_and_join(const char *relative_path);

int get_root_cgroup(void);

int create_and_get_cgroup(const char *relative_path);

void remove_cgroup(const char *relative_path);

unsigned long long get_cgroup_id(const char *relative_path);



int join_cgroup(const char *relative_path);