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selftests/bpf: Add cgroup helper remove_cgroup()

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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: Hou Tao <houtao1@huawei.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20221121073440.1828292-3-houtao@huaweicloud.com
This commit is contained in:
Hou Tao 2022-11-21 15:34:39 +08:00 committed by Daniel Borkmann
parent 1a5160d4d8
commit 2a42461a88
2 changed files with 20 additions and 0 deletions
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19
tools/testing/selftests/bpf/cgroup_helpers.c
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@ -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

1
tools/testing/selftests/bpf/cgroup_helpers.h
View File

@ -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);