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cgroup-util: add cg_path_get_unit_full() helper and related calls

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This helper returns not only the unit a cgroup belongs to, but also the
cgroup sub-path beyond it.
This commit is contained in:
Lennart Poettering
2025-07-11 18:15:08 +02:00
parent 571867ffa7
commit 7bb1147b00
3 changed files with 76 additions and 20 deletions
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src/basic/cgroup-util.c
+34 -17
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@@ -973,15 +973,14 @@ static const char* skip_slices(const char *p) {
}
}
int cg_path_get_unit(const char *path, char **ret) {
_cleanup_free_ char *unit = NULL;
const char *e;
int cg_path_get_unit_full(const char *path, char **ret_unit, char **ret_subgroup) {
int r;
assert(path);
e = skip_slices(path);
const char *e = skip_slices(path);
_cleanup_free_ char *unit = NULL;
r = cg_path_decode_unit(e, &unit);
if (r < 0)
return r;
@@ -990,8 +989,27 @@ int cg_path_get_unit(const char *path, char **ret) {
if (endswith(unit, ".slice"))
return -ENXIO;
if (ret)
*ret = TAKE_PTR(unit);
if (ret_subgroup) {
_cleanup_free_ char *subgroup = NULL;
e += strcspn(e, "/");
e += strspn(e, "/");
if (isempty(e))
subgroup = NULL;
else {
subgroup = strdup(e);
if (!subgroup)
return -ENOMEM;
}
path_simplify(subgroup);
*ret_subgroup = TAKE_PTR(subgroup);
}
if (ret_unit)
*ret_unit = TAKE_PTR(unit);
return 0;
}
@@ -1017,31 +1035,27 @@ int cg_path_get_unit_path(const char *path, char **ret) {
return 0;
}
int cg_pid_get_unit(pid_t pid, char **ret_unit) {
_cleanup_free_ char *cgroup = NULL;
int cg_pid_get_unit_full(pid_t pid, char **ret_unit, char **ret_subgroup) {
int r;
assert(ret_unit);
_cleanup_free_ char *cgroup = NULL;
r = cg_pid_get_path_shifted(pid, NULL, &cgroup);
if (r < 0)
return r;
return cg_path_get_unit(cgroup, ret_unit);
return cg_path_get_unit_full(cgroup, ret_unit, ret_subgroup);
}
int cg_pidref_get_unit(const PidRef *pidref, char **ret) {
_cleanup_free_ char *unit = NULL;
int cg_pidref_get_unit_full(const PidRef *pidref, char **ret_unit, char **ret_subgroup) {
int r;
assert(ret);
if (!pidref_is_set(pidref))
return -ESRCH;
if (pidref_is_remote(pidref))
return -EREMOTE;
r = cg_pid_get_unit(pidref->pid, &unit);
_cleanup_free_ char *unit = NULL, *subgroup = NULL;
r = cg_pid_get_unit_full(pidref->pid, &unit, &subgroup);
if (r < 0)
return r;
@@ -1049,7 +1063,10 @@ int cg_pidref_get_unit(const PidRef *pidref, char **ret) {
if (r < 0)
return r;
*ret = TAKE_PTR(unit);
if (ret_unit)
*ret_unit = TAKE_PTR(unit);
if (ret_subgroup)
*ret_subgroup = TAKE_PTR(subgroup);
return 0;
}