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cgroup-util: introduce cg_get_cgroupid_at()

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Suggested in https://github.com/systemd/systemd/pull/35242#discussion_r1862658163
This commit is contained in:
Mike Yuan 2024-11-29 13:43:02 +01:00 committed by Yu Watanabe
parent 2522757a89
commit eded4272d2
2 changed files with 26 additions and 32 deletions
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48
src/basic/cgroup-util.c
View File

@ -68,6 +68,24 @@ int cg_cgroupid_open(int cgroupfs_fd, uint64_t id) {
return RET_NERRNO(open_by_handle_at(cgroupfs_fd, &fh.file_handle, O_DIRECTORY|O_CLOEXEC));
}
int cg_get_cgroupid_at(int dfd, const char *path, uint64_t *ret) {
cg_file_handle fh = CG_FILE_HANDLE_INIT;
int mnt_id;
assert(dfd >= 0 || (dfd == AT_FDCWD && path_is_absolute(path)));
assert(ret);
/* This is cgroupfs so we know the size of the handle, thus no need to loop around like
* name_to_handle_at_loop() does in mountpoint-util.c */
if (name_to_handle_at(dfd, strempty(path), &fh.file_handle, &mnt_id, isempty(path) ? AT_EMPTY_PATH : 0) < 0) {
assert(errno != EOVERFLOW);
return -errno;
}
*ret = CG_FILE_HANDLE_CGROUPID(fh);
return 0;
}
static int cg_enumerate_items(const char *controller, const char *path, FILE **ret, const char *item) {
_cleanup_free_ char *fs = NULL;
FILE *f;
@ -1345,36 +1363,6 @@ int cg_pid_get_machine_name(pid_t pid, char **ret_machine) {
return cg_path_get_machine_name(cgroup, ret_machine);
}
int cg_path_get_cgroupid(const char *path, uint64_t *ret) {
cg_file_handle fh = CG_FILE_HANDLE_INIT;
int mnt_id;
assert(path);
assert(ret);
/* This is cgroupfs so we know the size of the handle, thus no need to loop around like
* name_to_handle_at_loop() does in mountpoint-util.c */
if (name_to_handle_at(AT_FDCWD, path, &fh.file_handle, &mnt_id, 0) < 0)
return -errno;
*ret = CG_FILE_HANDLE_CGROUPID(fh);
return 0;
}
int cg_fd_get_cgroupid(int fd, uint64_t *ret) {
cg_file_handle fh = CG_FILE_HANDLE_INIT;
int mnt_id = -1;
assert(fd >= 0);
assert(ret);
if (name_to_handle_at(fd, "", &fh.file_handle, &mnt_id, AT_EMPTY_PATH) < 0)
return -errno;
*ret = CG_FILE_HANDLE_CGROUPID(fh);
return 0;
}
int cg_path_get_session(const char *path, char **ret_session) {
_cleanup_free_ char *unit = NULL;
char *start, *end;

10
src/basic/cgroup-util.h
View File

@ -183,6 +183,14 @@ typedef enum CGroupUnified {
int cg_path_open(const char *controller, const char *path);
int cg_cgroupid_open(int fsfd, uint64_t id);
int cg_get_cgroupid_at(int dfd, const char *path, uint64_t *ret);
static inline int cg_path_get_cgroupid(const char *path, uint64_t *ret) {
return cg_get_cgroupid_at(AT_FDCWD, path, ret);
}
static inline int cg_fd_get_cgroupid(int fd, uint64_t *ret) {
return cg_get_cgroupid_at(fd, NULL, ret);
}
typedef enum CGroupFlags {
CGROUP_SIGCONT = 1 << 0,
CGROUP_IGNORE_SELF = 1 << 1,
@ -265,8 +273,6 @@ int cg_is_empty_recursive(const char *controller, const char *path);
int cg_get_root_path(char **path);
int cg_path_get_cgroupid(const char *path, uint64_t *ret);
int cg_fd_get_cgroupid(int fd, uint64_t *ret);
int cg_path_get_session(const char *path, char **ret_session);
int cg_path_get_owner_uid(const char *path, uid_t *ret_uid);
int cg_path_get_unit(const char *path, char **ret_unit);