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systemd-oomd: unit testable helper functions

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Helpers used by the systemd-oomd daemon to read/fill in various contexts and
make detection and kill decisions.

i.e. a simplified/less configurable version of
https://github.com/facebookincubator/oomd/tree/master/src/oomd.
This commit is contained in:
Anita Zhang
2020-10-07 17:12:22 -07:00
parent 42b83e8e33
commit 61ff7397d0
8 changed files with 880 additions and 2 deletions
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src/shared/tests.c
+16 -2
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@@ -254,7 +254,7 @@ static int allocate_scope(void) {
return 0;
}
int enter_cgroup_subroot(char **ret_cgroup) {
static int enter_cgroup(char **ret_cgroup, bool enter_subroot) {
_cleanup_free_ char *cgroup_root = NULL, *cgroup_subroot = NULL;
CGroupMask supported;
int r;
@@ -268,7 +268,13 @@ int enter_cgroup_subroot(char **ret_cgroup) {
return log_warning_errno(r, "cg_pid_get_path(NULL, 0, ...) failed: %m");
assert(r >= 0);
assert_se(asprintf(&cgroup_subroot, "%s/%" PRIx64, cgroup_root, random_u64()) >= 0);
if (enter_subroot)
assert_se(asprintf(&cgroup_subroot, "%s/%" PRIx64, cgroup_root, random_u64()) >= 0);
else {
cgroup_subroot = strdup(cgroup_root);
assert_se(cgroup_subroot != NULL);
}
assert_se(cg_mask_supported(&supported) >= 0);
/* If this fails, then we don't mind as the later cgroup operations will fail too, and it's fine if
@@ -287,3 +293,11 @@ int enter_cgroup_subroot(char **ret_cgroup) {
return 0;
}
int enter_cgroup_subroot(char **ret_cgroup) {
return enter_cgroup(ret_cgroup, true);
}
int enter_cgroup_root(char **ret_cgroup) {
return enter_cgroup(ret_cgroup, false);
}