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-rw-r--r--src/cgroup-util.c529
1 files changed, 332 insertions, 197 deletions
diff --git a/src/cgroup-util.c b/src/cgroup-util.c
index e38d6f5c10..26e8f691d3 100644
--- a/src/cgroup-util.c
+++ b/src/cgroup-util.c
@@ -24,8 +24,7 @@
#include <signal.h>
#include <string.h>
#include <stdlib.h>
-
-#include <libcgroup.h>
+#include <dirent.h>
#include "cgroup-util.h"
#include "log.h"
@@ -33,54 +32,6 @@
#include "macro.h"
#include "util.h"
-/*
- Currently, the only remaining functionality from libcgroup we call
- here is:
-
- - cgroup_walk_tree_begin()/cgroup_walk_tree_next()
- - cgroup_delete_cgroup_ext()
- */
-
-int cg_translate_error(int error, int _errno) {
-
- switch (error) {
-
- case ECGROUPNOTCOMPILED:
- case ECGROUPNOTMOUNTED:
- case ECGROUPNOTEXIST:
- case ECGROUPNOTCREATED:
- return -ENOENT;
-
- case ECGINVAL:
- return -EINVAL;
-
- case ECGROUPNOTALLOWED:
- return -EPERM;
-
- case ECGOTHER:
- return -_errno;
- }
-
- return -EIO;
-}
-
-static struct cgroup* cg_new(const char *controller, const char *path) {
- struct cgroup *cgroup;
-
- assert(path);
- assert(controller);
-
- if (!(cgroup = cgroup_new_cgroup(path)))
- return NULL;
-
- if (!cgroup_add_controller(cgroup, controller)) {
- cgroup_free(&cgroup);
- return NULL;
- }
-
- return cgroup;
-}
-
int cg_enumerate_processes(const char *controller, const char *path, FILE **_f) {
char *fs;
int r;
@@ -147,11 +98,77 @@ int cg_read_pid(FILE *f, pid_t *_pid) {
return 1;
}
+int cg_enumerate_subgroups(const char *controller, const char *path, DIR **_d) {
+ char *fs;
+ int r;
+ DIR *d;
+
+ assert(controller);
+ assert(path);
+ assert(_d);
+
+ /* This is not recursive! */
+
+ if ((r = cg_get_path(controller, path, NULL, &fs)) < 0)
+ return r;
+
+ d = opendir(fs);
+ free(fs);
+
+ if (!d)
+ return -errno;
+
+ *_d = d;
+ return 0;
+}
+
+int cg_read_subgroup(DIR *d, char **fn) {
+ struct dirent *de;
+
+ assert(d);
+
+ errno = 0;
+ while ((de = readdir(d))) {
+ char *b;
+
+ if (de->d_type != DT_DIR)
+ continue;
+
+ if (streq(de->d_name, ".") ||
+ streq(de->d_name, ".."))
+ continue;
+
+ if (!(b = strdup(de->d_name)))
+ return -ENOMEM;
+
+ *fn = b;
+ return 1;
+ }
+
+ if (errno)
+ return -errno;
+
+ return 0;
+}
+
+int cg_rmdir(const char *controller, const char *path) {
+ char *p;
+ int r;
+
+ if ((r = cg_get_path(controller, path, NULL, &p)) < 0)
+ return r;
+
+ r = rmdir(p);
+ free(p);
+
+ return r < 0 ? -errno : 0;
+}
+
int cg_kill(const char *controller, const char *path, int sig, bool ignore_self) {
- bool killed = false, done = false;
+ bool done = false;
Set *s;
- pid_t my_pid;
int r, ret = 0;
+ pid_t my_pid;
FILE *f = NULL;
assert(controller);
@@ -171,8 +188,12 @@ int cg_kill(const char *controller, const char *path, int sig, bool ignore_self)
pid_t pid;
done = true;
- if ((r = cg_enumerate_processes(controller, path, &f)) < 0)
+ if ((r = cg_enumerate_processes(controller, path, &f)) < 0) {
+ if (ret >= 0)
+ ret = r;
+
goto finish;
+ }
while ((r = cg_read_pid(f, &pid)) > 0) {
@@ -185,15 +206,26 @@ int cg_kill(const char *controller, const char *path, int sig, bool ignore_self)
/* If we haven't killed this process yet, kill
* it */
if (kill(pid, sig) < 0 && errno != ESRCH) {
- if (ret == 0)
+ if (ret >= 0)
ret = -errno;
- }
+ } else if (ret == 0)
+ ret = 1;
- killed = true;
done = false;
- if ((r = set_put(s, LONG_TO_PTR(pid))) < 0)
- break;
+ if ((r = set_put(s, LONG_TO_PTR(pid))) < 0) {
+ if (ret >= 0)
+ ret = r;
+
+ goto finish;
+ }
+ }
+
+ if (r < 0) {
+ if (ret >= 0)
+ ret = r;
+
+ goto finish;
}
fclose(f);
@@ -203,7 +235,7 @@ int cg_kill(const char *controller, const char *path, int sig, bool ignore_self)
* quicker than we can kill them we repeat this until
* no new pids need to be killed. */
- } while (!done && r >= 0);
+ } while (!done);
finish:
set_free(s);
@@ -211,69 +243,64 @@ finish:
if (f)
fclose(f);
- if (r < 0)
- return r;
-
- if (ret < 0)
- return ret;
-
- return !!killed;
+ return ret;
}
-int cg_kill_recursive(const char *controller, const char *path, int sig, bool ignore_self) {
- struct cgroup_file_info info;
- int level = 0, r, ret = 0;
- void *iterator = NULL;
- bool killed = false;
+int cg_kill_recursive(const char *controller, const char *path, int sig, bool ignore_self, bool rem) {
+ int r, ret = 0;
+ DIR *d = NULL;
+ char *fn;
assert(path);
assert(controller);
assert(sig >= 0);
- zero(info);
+ ret = cg_kill(controller, path, sig, ignore_self);
- r = cgroup_walk_tree_begin(controller, path, 0, &iterator, &info, &level);
- while (r == 0) {
- int k;
- char *p;
+ if ((r = cg_enumerate_subgroups(controller, path, &d)) < 0) {
+ if (ret >= 0)
+ ret = r;
- if (info.type != CGROUP_FILE_TYPE_DIR)
- goto next;
+ goto finish;
+ }
- if (asprintf(&p, "%s/%s", path, info.path) < 0) {
- ret = -ENOMEM;
- break;
- }
+ while ((r = cg_read_subgroup(d, &fn)) > 0) {
+ char *p = NULL;
- k = cg_kill(controller, p, sig, ignore_self);
- free(p);
+ r = asprintf(&p, "%s/%s", path, fn);
+ free(fn);
+
+ if (r < 0) {
+ if (ret >= 0)
+ ret = -ENOMEM;
- if (k < 0) {
- if (ret == 0)
- ret = k;
- } else if (k > 0)
- killed = true;
+ goto finish;
+ }
- next:
+ r = cg_kill_recursive(controller, p, sig, ignore_self, rem);
+ free(p);
- r = cgroup_walk_tree_next(0, &iterator, &info, level);
+ if (r != 0 && ret >= 0)
+ ret = r;
}
- if (ret == 0) {
- if (r == 0 || r == ECGEOF)
- ret = !!killed;
- else if (r == ECGOTHER && errno == ENOENT)
- ret = -ESRCH;
- else
- ret = cg_translate_error(r, errno);
- }
+ if (r < 0 && ret >= 0)
+ ret = r;
+
+ if (rem)
+ if ((r = cg_rmdir(controller, path)) < 0) {
+ if (ret >= 0)
+ ret = r;
+ }
- assert_se(cgroup_walk_tree_end(&iterator) == 0);
+finish:
+ if (d)
+ closedir(d);
return ret;
}
-int cg_kill_recursive_and_wait(const char *controller, const char *path) {
+int cg_kill_recursive_and_wait(const char *controller, const char *path, bool rem) {
unsigned i;
assert(path);
@@ -294,7 +321,7 @@ int cg_kill_recursive_and_wait(const char *controller, const char *path) {
else
sig = 0;
- if ((r = cg_kill_recursive(controller, path, sig, true)) <= 0)
+ if ((r = cg_kill_recursive(controller, path, sig, true, rem)) <= 0)
return r;
usleep(50 * USEC_PER_MSEC);
@@ -304,7 +331,8 @@ int cg_kill_recursive_and_wait(const char *controller, const char *path) {
}
int cg_migrate(const char *controller, const char *from, const char *to, bool ignore_self) {
- bool migrated = false, done = false;
+ bool done = false;
+ Set *s;
int r, ret = 0;
pid_t my_pid;
FILE *f = NULL;
@@ -313,96 +341,119 @@ int cg_migrate(const char *controller, const char *from, const char *to, bool ig
assert(from);
assert(to);
+ if (!(s = set_new(trivial_hash_func, trivial_compare_func)))
+ return -ENOMEM;
+
my_pid = getpid();
do {
pid_t pid;
done = true;
- if ((r = cg_enumerate_tasks(controller, from, &f)) < 0)
+ if ((r = cg_enumerate_tasks(controller, from, &f)) < 0) {
+ if (ret >= 0)
+ ret = r;
+
goto finish;
+ }
while ((r = cg_read_pid(f, &pid)) > 0) {
+ /* This might do weird stuff if we aren't a
+ * single-threaded program. However, we
+ * luckily know we are not */
if (pid == my_pid && ignore_self)
continue;
+ if (set_get(s, LONG_TO_PTR(pid)) == LONG_TO_PTR(pid))
+ continue;
+
if ((r = cg_attach(controller, to, pid)) < 0) {
- if (ret == 0)
- ret = -r;
- }
+ if (ret >= 0)
+ ret = r;
+ } else if (ret == 0)
+ ret = 1;
- migrated = true;
done = false;
+
+ if ((r = set_put(s, LONG_TO_PTR(pid))) < 0) {
+ if (ret >= 0)
+ ret = r;
+
+ goto finish;
+ }
+ }
+
+ if (r < 0) {
+ if (ret >= 0)
+ ret = r;
+
+ goto finish;
}
fclose(f);
f = NULL;
- } while (!done && r >= 0);
+ } while (!done);
finish:
+ set_free(s);
if (f)
fclose(f);
- if (r < 0)
- return r;
-
- if (ret < 0)
- return ret;
-
- return !!migrated;
+ return ret;
}
-int cg_migrate_recursive(const char *controller, const char *from, const char *to, bool ignore_self) {
- struct cgroup_file_info info;
- int level = 0, r, ret = 0;
- void *iterator = NULL;
- bool migrated = false;
+int cg_migrate_recursive(const char *controller, const char *from, const char *to, bool ignore_self, bool rem) {
+ int r, ret = 0;
+ DIR *d = NULL;
+ char *fn;
assert(controller);
assert(from);
assert(to);
- zero(info);
+ ret = cg_migrate(controller, from, to, ignore_self);
- r = cgroup_walk_tree_begin(controller, from, 0, &iterator, &info, &level);
- while (r == 0) {
- int k;
- char *p;
+ if ((r = cg_enumerate_subgroups(controller, from, &d)) < 0) {
+ if (ret >= 0)
+ ret = r;
+ goto finish;
+ }
+
+ while ((r = cg_read_subgroup(d, &fn)) > 0) {
+ char *p = NULL;
- if (info.type != CGROUP_FILE_TYPE_DIR)
- goto next;
+ r = asprintf(&p, "%s/%s", from, fn);
+ free(fn);
- if (asprintf(&p, "%s/%s", from, info.path) < 0) {
- ret = -ENOMEM;
- break;
+ if (r < 0) {
+ if (ret >= 0)
+ ret = -ENOMEM;
+
+ goto finish;
}
- k = cg_migrate(controller, p, to, ignore_self);
+ r = cg_migrate_recursive(controller, p, to, ignore_self, rem);
free(p);
- if (k < 0) {
- if (ret == 0)
- ret = k;
- } else if (k > 0)
- migrated = true;
-
- next:
- r = cgroup_walk_tree_next(0, &iterator, &info, level);
+ if (r != 0 && ret >= 0)
+ ret = r;
}
- if (ret == 0) {
- if (r == 0 || r == ECGEOF)
- r = !!migrated;
- else if (r == ECGOTHER && errno == ENOENT)
- r = -ESRCH;
- else
- r = cg_translate_error(r, errno);
- }
+ if (r < 0 && ret >= 0)
+ ret = r;
+
+ if (rem)
+ if ((r = cg_rmdir(controller, from)) < 0) {
+ if (ret >= 0)
+ ret = r;
+ }
- assert_se(cgroup_walk_tree_end(&iterator) == 0);
+finish:
+ if (d)
+ closedir(d);
return ret;
}
@@ -470,24 +521,17 @@ int cg_trim(const char *controller, const char *path, bool delete_root) {
}
int cg_delete(const char *controller, const char *path) {
- struct cgroup *cg;
+ char *parent;
int r;
assert(controller);
assert(path);
- if (!(cg = cg_new(controller, path)))
- return -ENOMEM;
-
- if ((r = cgroup_delete_cgroup_ext(cg, CGFLAG_DELETE_RECURSIVE|CGFLAG_DELETE_IGNORE_MIGRATION)) != 0) {
- r = cg_translate_error(r, errno);
- goto finish;
- }
-
- r = 0;
+ if ((r = parent_of_path(path, &parent)) < 0)
+ return r;
-finish:
- cgroup_free(&cg);
+ r = cg_migrate_recursive(controller, path, parent, false, true);
+ free(parent);
return r;
}
@@ -739,63 +783,154 @@ int cg_is_empty(const char *controller, const char *path, bool ignore_self) {
}
int cg_is_empty_recursive(const char *controller, const char *path, bool ignore_self) {
- struct cgroup_file_info info;
- int level = 0, r, ret = 0;
- void *iterator = NULL;
- bool empty = true;
+ int r;
+ DIR *d = NULL;
+ char *fn;
assert(controller);
assert(path);
- zero(info);
+ if ((r = cg_is_empty(controller, path, ignore_self)) <= 0)
+ return r;
+
+ if ((r = cg_enumerate_subgroups(controller, path, &d)) < 0)
+ return r;
- r = cgroup_walk_tree_begin(controller, path, 0, &iterator, &info, &level);
- while (r == 0) {
- int k;
- char *p;
+ while ((r = cg_read_subgroup(d, &fn)) > 0) {
+ char *p = NULL;
- if (info.type != CGROUP_FILE_TYPE_DIR)
- goto next;
+ r = asprintf(&p, "%s/%s", path, fn);
+ free(fn);
- if (asprintf(&p, "%s/%s", path, info.path) < 0) {
- ret = -ENOMEM;
- break;
+ if (r < 0) {
+ r = -ENOMEM;
+ goto finish;
}
- k = cg_is_empty(controller, p, ignore_self);
+ r = cg_is_empty_recursive(controller, p, ignore_self);
free(p);
- if (k < 0) {
- ret = k;
- break;
- } else if (k == 0) {
- empty = false;
- break;
+ if (r <= 0)
+ goto finish;
+ }
+
+ if (r >= 0)
+ r = 1;
+
+finish:
+
+ if (d)
+ closedir(d);
+
+ return r;
+}
+
+int cg_split_spec(const char *spec, char **controller, char **path) {
+ const char *e;
+ char *t = NULL, *u = NULL;
+
+ assert(spec);
+ assert(controller || path);
+
+ if (*spec == '/') {
+
+ if (path) {
+ if (!(t = strdup(spec)))
+ return -ENOMEM;
+
+ *path = t;
}
- next:
- r = cgroup_walk_tree_next(0, &iterator, &info, level);
+ if (controller)
+ *controller = NULL;
+
+ return 0;
}
- if (ret == 0) {
- if (r == 0 || r == ECGEOF)
- ret = !!empty;
- else if (r == ECGOTHER && errno == ENOENT)
- ret = -ESRCH;
- else
- ret = cg_translate_error(r, errno);
+ if (!(e = strchr(spec, ':'))) {
+
+ if (strchr(spec, '/') || spec[0] == 0)
+ return -EINVAL;
+
+ if (controller) {
+ if (!(t = strdup(spec)))
+ return -ENOMEM;
+
+ *controller = t;
+ }
+
+ if (path)
+ *path = NULL;
+
+ return 0;
}
- assert_se(cgroup_walk_tree_end(&iterator) == 0);
+ if (e[1] != '/' ||
+ e == spec ||
+ memchr(spec, '/', e-spec))
+ return -EINVAL;
- return ret;
+ if (controller)
+ if (!(t = strndup(spec, e-spec)))
+ return -ENOMEM;
+
+ if (path)
+ if (!(u = strdup(e+1))) {
+ free(t);
+ return -ENOMEM;
+ }
+
+ if (controller)
+ *controller = t;
+
+ if (path)
+ *path = u;
+
+ return 0;
}
-int cg_init(void) {
- int r;
+int cg_join_spec(const char *controller, const char *path, char **spec) {
+ assert(controller);
+ assert(path);
- if ((r = cgroup_init()) != 0)
- return cg_translate_error(r, errno);
+ if (!path_is_absolute(path) ||
+ controller[0] == 0 ||
+ strchr(controller, ':') ||
+ strchr(controller, '/'))
+ return -EINVAL;
+
+ if (asprintf(spec, "%s:%s", controller, path) < 0)
+ return -ENOMEM;
return 0;
}
+
+int cg_fix_path(const char *path, char **result) {
+ char *t, *c, *p;
+ int r;
+
+ assert(path);
+ assert(result);
+
+ /* First check if it already is a filesystem path */
+ if (path_is_absolute(path) &&
+ path_startswith(path, "/cgroup") &&
+ access(path, F_OK) >= 0) {
+
+ if (!(t = strdup(path)))
+ return -ENOMEM;
+
+ *result = t;
+ return 0;
+ }
+
+ /* Otherwise treat it as cg spec */
+ if ((r = cg_split_spec(path, &c, &p)) < 0)
+ return r;
+
+ r = cg_get_path(c ? c : SYSTEMD_CGROUP_CONTROLLER, p ? p : "/", NULL, result);
+ free(c);
+ free(p);
+
+ return r;
+}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-13 19:22:16 +0000