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-rw-r--r--src/libudev/cgroup-util.c1108
-rw-r--r--src/libudev/cgroup-util.h53
-rw-r--r--src/libudev/path-util.h1
-rw-r--r--src/libudev/set.h11
4 files changed, 80 insertions, 1093 deletions
diff --git a/src/libudev/cgroup-util.c b/src/libudev/cgroup-util.c
index 19f9889c8a..a276bf1061 100644
--- a/src/libudev/cgroup-util.c
+++ b/src/libudev/cgroup-util.c
@@ -20,62 +20,27 @@
***/
#include <errno.h>
-#include <unistd.h>
#include <signal.h>
#include <string.h>
#include <stdlib.h>
-#include <dirent.h>
-#include <sys/stat.h>
#include <sys/types.h>
-#include <ftw.h>
#include "cgroup-util.h"
-#include "log.h"
#include "set.h"
-#include "macro.h"
-#include "util.h"
#include "path-util.h"
-#include "strv.h"
-
-static const char cgroup_path[] = "/sys/fs/cgroup/";
int cg_enumerate_processes(const char *controller, const char *path, FILE **_f) {
- char *fs;
- int r;
+ _cleanup_free_ char *fs = NULL;
FILE *f;
-
- assert(path);
- assert(_f);
-
- r = cg_get_path(controller, path, "cgroup.procs", &fs);
- if (r < 0)
- return r;
-
- f = fopen(fs, "re");
- free(fs);
-
- if (!f)
- return -errno;
-
- *_f = f;
- return 0;
-}
-
-int cg_enumerate_tasks(const char *controller, const char *path, FILE **_f) {
- char *fs;
int r;
- FILE *f;
- assert(path);
assert(_f);
- r = cg_get_path(controller, path, "tasks", &fs);
+ r = cg_get_path(controller, path, "cgroup.procs", &fs);
if (r < 0)
return r;
f = fopen(fs, "re");
- free(fs);
-
if (!f)
return -errno;
@@ -89,6 +54,9 @@ int cg_read_pid(FILE *f, pid_t *_pid) {
/* Note that the cgroup.procs might contain duplicates! See
* cgroups.txt for details. */
+ assert(f);
+ assert(_pid);
+
errno = 0;
if (fscanf(f, "%lu", &ul) != 1) {
@@ -105,128 +73,42 @@ 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(path);
- assert(_d);
-
- /* This is not recursive! */
-
- r = cg_get_path(controller, path, NULL, &fs);
- if (r < 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, bool honour_sticky) {
- char *p;
- int r;
-
- r = cg_get_path(controller, path, NULL, &p);
- if (r < 0)
- return r;
-
- if (honour_sticky) {
- char *tasks;
-
- /* If the sticky bit is set don't remove the directory */
-
- tasks = strappend(p, "/tasks");
- if (!tasks) {
- free(p);
- return -ENOMEM;
- }
-
- r = file_is_priv_sticky(tasks);
- free(tasks);
-
- if (r > 0) {
- free(p);
- return 0;
- }
- }
-
- r = rmdir(p);
- free(p);
-
- return (r < 0 && errno != ENOENT) ? -errno : 0;
-}
-
int cg_kill(const char *controller, const char *path, int sig, bool sigcont, bool ignore_self, Set *s) {
+ _cleanup_set_free_ Set *allocated_set = NULL;
bool done = false;
int r, ret = 0;
pid_t my_pid;
- FILE *f = NULL;
- Set *allocated_set = NULL;
- assert(controller);
- assert(path);
assert(sig >= 0);
/* This goes through the tasks list and kills them all. This
* is repeated until no further processes are added to the
* tasks list, to properly handle forking processes */
- if (!s)
- if (!(s = allocated_set = set_new(trivial_hash_func, trivial_compare_func)))
+ if (!s) {
+ s = allocated_set = set_new(trivial_hash_func, trivial_compare_func);
+ if (!s)
return -ENOMEM;
+ }
my_pid = getpid();
do {
+ _cleanup_fclose_ FILE *f = NULL;
pid_t pid = 0;
done = true;
- if ((r = cg_enumerate_processes(controller, path, &f)) < 0) {
+ r = cg_enumerate_processes(controller, path, &f);
+ if (r < 0) {
if (ret >= 0 && r != -ENOENT)
- ret = r;
+ return r;
- goto finish;
+ return ret;
}
while ((r = cg_read_pid(f, &pid)) > 0) {
- if (pid == my_pid && ignore_self)
+ if (ignore_self && pid == my_pid)
continue;
if (set_get(s, LONG_TO_PTR(pid)) == LONG_TO_PTR(pid))
@@ -247,266 +129,34 @@ int cg_kill(const char *controller, const char *path, int sig, bool sigcont, boo
done = false;
- if ((r = set_put(s, LONG_TO_PTR(pid))) < 0) {
+ r = set_put(s, LONG_TO_PTR(pid));
+ if (r < 0) {
if (ret >= 0)
- ret = r;
+ return r;
- goto finish;
+ return ret;
}
}
if (r < 0) {
if (ret >= 0)
- ret = r;
+ return r;
- goto finish;
+ return ret;
}
- fclose(f);
- f = NULL;
-
/* To avoid racing against processes which fork
* quicker than we can kill them we repeat this until
* no new pids need to be killed. */
} while (!done);
-finish:
- if (allocated_set)
- set_free(allocated_set);
-
- if (f)
- fclose(f);
-
- return ret;
-}
-
-int cg_kill_recursive(const char *controller, const char *path, int sig, bool sigcont, bool ignore_self, bool rem, Set *s) {
- int r, ret = 0;
- DIR *d = NULL;
- char *fn;
- Set *allocated_set = NULL;
-
- assert(path);
- assert(controller);
- assert(sig >= 0);
-
- if (!s)
- if (!(s = allocated_set = set_new(trivial_hash_func, trivial_compare_func)))
- return -ENOMEM;
-
- ret = cg_kill(controller, path, sig, sigcont, ignore_self, s);
-
- if ((r = cg_enumerate_subgroups(controller, path, &d)) < 0) {
- if (ret >= 0 && r != -ENOENT)
- ret = r;
-
- goto finish;
- }
-
- while ((r = cg_read_subgroup(d, &fn)) > 0) {
- char *p = NULL;
-
- r = asprintf(&p, "%s/%s", path, fn);
- free(fn);
-
- if (r < 0) {
- if (ret >= 0)
- ret = -ENOMEM;
-
- goto finish;
- }
-
- r = cg_kill_recursive(controller, p, sig, sigcont, ignore_self, rem, s);
- free(p);
-
- if (r != 0 && ret >= 0)
- ret = r;
- }
-
- if (r < 0 && ret >= 0)
- ret = r;
-
- if (rem)
- if ((r = cg_rmdir(controller, path, true)) < 0) {
- if (ret >= 0 &&
- r != -ENOENT &&
- r != -EBUSY)
- ret = r;
- }
-
-finish:
- if (d)
- closedir(d);
-
- if (allocated_set)
- set_free(allocated_set);
-
return ret;
}
-int cg_kill_recursive_and_wait(const char *controller, const char *path, bool rem) {
- unsigned i;
-
- assert(path);
- assert(controller);
-
- /* This safely kills all processes; first it sends a SIGTERM,
- * then checks 8 times after 200ms whether the group is now
- * empty, then kills everything that is left with SIGKILL and
- * finally checks 5 times after 200ms each whether the group
- * is finally empty. */
-
- for (i = 0; i < 15; i++) {
- int sig, r;
-
- if (i <= 0)
- sig = SIGTERM;
- else if (i == 9)
- sig = SIGKILL;
- else
- sig = 0;
-
- if ((r = cg_kill_recursive(controller, path, sig, true, true, rem, NULL)) <= 0)
- return r;
-
- usleep(200 * USEC_PER_MSEC);
- }
-
- return 0;
-}
-
-int cg_migrate(const char *controller, const char *from, const char *to, bool ignore_self) {
- bool done = false;
- Set *s;
- int r, ret = 0;
- pid_t my_pid;
- FILE *f = NULL;
-
- assert(controller);
- assert(from);
- assert(to);
-
- if (!(s = set_new(trivial_hash_func, trivial_compare_func)))
- return -ENOMEM;
-
- my_pid = getpid();
-
- do {
- pid_t pid = 0;
- done = true;
-
- if ((r = cg_enumerate_tasks(controller, from, &f)) < 0) {
- if (ret >= 0 && r != -ENOENT)
- 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 && r != -ESRCH)
- ret = r;
- } else if (ret == 0)
- ret = 1;
-
- 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);
-
-finish:
- set_free(s);
-
- if (f)
- fclose(f);
-
- return ret;
-}
-
-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;
+static const char *normalize_controller(const char *controller) {
assert(controller);
- assert(from);
- assert(to);
-
- ret = cg_migrate(controller, from, to, ignore_self);
-
- if ((r = cg_enumerate_subgroups(controller, from, &d)) < 0) {
- if (ret >= 0 && r != -ENOENT)
- ret = r;
- goto finish;
- }
-
- while ((r = cg_read_subgroup(d, &fn)) > 0) {
- char *p = NULL;
-
- r = asprintf(&p, "%s/%s", from, fn);
- free(fn);
-
- if (r < 0) {
- if (ret >= 0)
- ret = -ENOMEM;
-
- goto finish;
- }
-
- r = cg_migrate_recursive(controller, p, to, ignore_self, rem);
- free(p);
-
- if (r != 0 && ret >= 0)
- ret = r;
- }
-
- if (r < 0 && ret >= 0)
- ret = r;
-
- if (rem)
- if ((r = cg_rmdir(controller, from, true)) < 0) {
- if (ret >= 0 &&
- r != -ENOENT &&
- r != -EBUSY)
- ret = r;
- }
-
-finish:
- if (d)
- closedir(d);
-
- return ret;
-}
-
-static const char *normalize_controller(const char *controller) {
if (streq(controller, SYSTEMD_CGROUP_CONTROLLER))
return "systemd";
@@ -519,23 +169,22 @@ static const char *normalize_controller(const char *controller) {
static int join_path(const char *controller, const char *path, const char *suffix, char **fs) {
char *t = NULL;
- if (!(controller || path))
- return -EINVAL;
-
if (controller) {
if (path && suffix)
- t = strjoin(cgroup_path, controller, "/", path, "/", suffix, NULL);
+ t = strjoin("/sys/fs/cgroup/", controller, "/", path, "/", suffix, NULL);
else if (path)
- t = strjoin(cgroup_path, controller, "/", path, NULL);
+ t = strjoin("/sys/fs/cgroup/", controller, "/", path, NULL);
else if (suffix)
- t = strjoin(cgroup_path, controller, "/", suffix, NULL);
+ t = strjoin("/sys/fs/cgroup/", controller, "/", suffix, NULL);
else
- t = strjoin(cgroup_path, controller, NULL);
+ t = strappend("/sys/fs/cgroup/", controller);
} else {
if (path && suffix)
t = strjoin(path, "/", suffix, NULL);
else if (path)
t = strdup(path);
+ else
+ return -EINVAL;
}
if (!t)
@@ -553,6 +202,9 @@ int cg_get_path(const char *controller, const char *path, const char *suffix, ch
assert(fs);
+ if (controller && !cg_controller_is_valid(controller, true))
+ return -EINVAL;
+
if (_unlikely_(!good)) {
int r;
@@ -565,694 +217,38 @@ int cg_get_path(const char *controller, const char *path, const char *suffix, ch
}
p = controller ? normalize_controller(controller) : NULL;
- return join_path(p, path, suffix, fs);
-}
-
-static int check(const char *p) {
- char *cc;
-
- assert(p);
-
- /* Check if this controller actually really exists */
- cc = alloca(sizeof(cgroup_path) + strlen(p));
- strcpy(stpcpy(cc, cgroup_path), p);
- if (access(cc, F_OK) < 0)
- return -errno;
-
- return 0;
-}
-
-int cg_get_path_and_check(const char *controller, const char *path, const char *suffix, char **fs) {
- const char *p;
- int r;
-
- assert(controller);
- assert(fs);
-
- if (isempty(controller))
- return -EINVAL;
-
- /* Normalize the controller syntax */
- p = normalize_controller(controller);
-
- /* Check if this controller actually really exists */
- r = check(p);
- if (r < 0)
- return r;
return join_path(p, path, suffix, fs);
}
-static int trim_cb(const char *path, const struct stat *sb, int typeflag, struct FTW *ftwbuf) {
- char *p;
- bool is_sticky;
-
- if (typeflag != FTW_DP)
- return 0;
-
- if (ftwbuf->level < 1)
- return 0;
-
- p = strappend(path, "/tasks");
- if (!p) {
- errno = ENOMEM;
- return 1;
- }
-
- is_sticky = file_is_priv_sticky(p) > 0;
- free(p);
-
- if (is_sticky)
- return 0;
-
- rmdir(path);
- return 0;
-}
-
-int cg_trim(const char *controller, const char *path, bool delete_root) {
- char *fs;
- int r = 0;
-
- assert(controller);
- assert(path);
-
- r = cg_get_path(controller, path, NULL, &fs);
- if (r < 0)
- return r;
-
- errno = 0;
- if (nftw(fs, trim_cb, 64, FTW_DEPTH|FTW_MOUNT|FTW_PHYS) < 0)
- r = errno ? -errno : -EIO;
-
- if (delete_root) {
- bool is_sticky;
- char *p;
- p = strappend(fs, "/tasks");
- if (!p) {
- free(fs);
- return -ENOMEM;
- }
+#define CONTROLLER_VALID \
+ "0123456789" \
+ "abcdefghijklmnopqrstuvwxyz" \
+ "ABCDEFGHIJKLMNOPQRSTUVWXYZ" \
+ "_"
- is_sticky = file_is_priv_sticky(p) > 0;
- free(p);
-
- if (!is_sticky)
- if (rmdir(fs) < 0 && errno != ENOENT) {
- if (r == 0)
- r = -errno;
- }
- }
-
- free(fs);
-
- return r;
-}
-
-int cg_delete(const char *controller, const char *path) {
- char *parent;
- int r;
-
- assert(controller);
- assert(path);
-
- if ((r = path_get_parent(path, &parent)) < 0)
- return r;
-
- r = cg_migrate_recursive(controller, path, parent, false, true);
- free(parent);
-
- return r == -ENOENT ? 0 : r;
-}
-
-int cg_attach(const char *controller, const char *path, pid_t pid) {
- char *fs;
- int r;
- char c[32];
-
- assert(controller);
- assert(path);
- assert(pid >= 0);
-
- r = cg_get_path_and_check(controller, path, "tasks", &fs);
- if (r < 0)
- return r;
-
- if (pid == 0)
- pid = getpid();
-
- snprintf(c, sizeof(c), "%lu\n", (unsigned long) pid);
- char_array_0(c);
-
- r = write_one_line_file(fs, c);
- free(fs);
-
- return r;
-}
-
-int cg_set_group_access(const char *controller, const char *path, mode_t mode, uid_t uid, gid_t gid) {
- char *fs;
- int r;
-
- assert(controller);
- assert(path);
-
- if (mode != (mode_t) -1)
- mode &= 0777;
-
- r = cg_get_path(controller, path, NULL, &fs);
- if (r < 0)
- return r;
-
- r = chmod_and_chown(fs, mode, uid, gid);
- free(fs);
-
- return r;
-}
-
-int cg_set_task_access(const char *controller, const char *path, mode_t mode, uid_t uid, gid_t gid, int sticky) {
- char *fs;
- int r;
-
- assert(controller);
- assert(path);
-
- if (mode == (mode_t) -1 && uid == (uid_t) -1 && gid == (gid_t) -1 && sticky < 0)
- return 0;
-
- if (mode != (mode_t) -1)
- mode &= 0666;
-
- r = cg_get_path(controller, path, "tasks", &fs);
- if (r < 0)
- return r;
-
- if (sticky >= 0 && mode != (mode_t) -1)
- /* Both mode and sticky param are passed */
- mode |= (sticky ? S_ISVTX : 0);
- else if ((sticky >= 0 && mode == (mode_t) -1) ||
- (mode != (mode_t) -1 && sticky < 0)) {
- struct stat st;
-
- /* Only one param is passed, hence read the current
- * mode from the file itself */
-
- r = lstat(fs, &st);
- if (r < 0) {
- free(fs);
- return -errno;
- }
-
- if (mode == (mode_t) -1)
- /* No mode set, we just shall set the sticky bit */
- mode = (st.st_mode & ~S_ISVTX) | (sticky ? S_ISVTX : 0);
- else
- /* Only mode set, leave sticky bit untouched */
- mode = (st.st_mode & ~0777) | mode;
- }
-
- r = chmod_and_chown(fs, mode, uid, gid);
- free(fs);
-
- return r;
-}
-
-int cg_get_by_pid(const char *controller, pid_t pid, char **path) {
- int r;
- char *p = NULL;
- FILE *f;
- char *fs;
- size_t cs;
-
- assert(controller);
- assert(path);
- assert(pid >= 0);
-
- if (pid == 0)
- pid = getpid();
-
- if (asprintf(&fs, "/proc/%lu/cgroup", (unsigned long) pid) < 0)
- return -ENOMEM;
-
- f = fopen(fs, "re");
- free(fs);
-
- if (!f)
- return errno == ENOENT ? -ESRCH : -errno;
-
- cs = strlen(controller);
-
- while (!feof(f)) {
- char line[LINE_MAX];
- char *l;
-
- errno = 0;
- if (!(fgets(line, sizeof(line), f))) {
- if (feof(f))
- break;
-
- r = errno ? -errno : -EIO;
- goto finish;
- }
-
- truncate_nl(line);
-
- if (!(l = strchr(line, ':')))
- continue;
-
- l++;
- if (strncmp(l, controller, cs) != 0)
- continue;
-
- if (l[cs] != ':')
- continue;
-
- if (!(p = strdup(l + cs + 1))) {
- r = -ENOMEM;
- goto finish;
- }
-
- *path = p;
- r = 0;
- goto finish;
- }
-
- r = -ENOENT;
-
-finish:
- fclose(f);
-
- return r;
-}
-
-int cg_install_release_agent(const char *controller, const char *agent) {
- char *fs = NULL, *contents = NULL, *line = NULL, *sc;
- int r;
-
- assert(controller);
- assert(agent);
-
- if ((r = cg_get_path(controller, NULL, "release_agent", &fs)) < 0)
- return r;
-
- if ((r = read_one_line_file(fs, &contents)) < 0)
- goto finish;
-
- sc = strstrip(contents);
- if (sc[0] == 0) {
-
- if (asprintf(&line, "%s\n", agent) < 0) {
- r = -ENOMEM;
- goto finish;
- }
-
- if ((r = write_one_line_file(fs, line)) < 0)
- goto finish;
-
- } else if (!streq(sc, agent)) {
- r = -EEXIST;
- goto finish;
- }
-
- free(fs);
- fs = NULL;
- if ((r = cg_get_path(controller, NULL, "notify_on_release", &fs)) < 0)
- goto finish;
-
- free(contents);
- contents = NULL;
- if ((r = read_one_line_file(fs, &contents)) < 0)
- goto finish;
-
- sc = strstrip(contents);
-
- if (streq(sc, "0")) {
- if ((r = write_one_line_file(fs, "1\n")) < 0)
- goto finish;
-
- r = 1;
- } else if (!streq(sc, "1")) {
- r = -EIO;
- goto finish;
- } else
- r = 0;
-
-finish:
- free(fs);
- free(contents);
- free(line);
-
- return r;
-}
-
-int cg_is_empty(const char *controller, const char *path, bool ignore_self) {
- pid_t pid = 0, self_pid;
- int r;
- FILE *f = NULL;
- bool found = false;
-
- assert(path);
-
- r = cg_enumerate_tasks(controller, path, &f);
- if (r < 0)
- return r == -ENOENT ? 1 : r;
-
- self_pid = getpid();
-
- while ((r = cg_read_pid(f, &pid)) > 0) {
-
- if (ignore_self && pid == self_pid)
- continue;
-
- found = true;
- break;
- }
-
- fclose(f);
-
- if (r < 0)
- return r;
-
- return !found;
-}
-
-int cg_is_empty_recursive(const char *controller, const char *path, bool ignore_self) {
- int r;
- DIR *d = NULL;
- char *fn;
-
- assert(path);
-
- r = cg_is_empty(controller, path, ignore_self);
- if (r <= 0)
- return r;
-
- r = cg_enumerate_subgroups(controller, path, &d);
- if (r < 0)
- return r == -ENOENT ? 1 : r;
-
- while ((r = cg_read_subgroup(d, &fn)) > 0) {
- char *p = NULL;
-
- r = asprintf(&p, "%s/%s", path, fn);
- free(fn);
-
- if (r < 0) {
- r = -ENOMEM;
- goto finish;
- }
-
- r = cg_is_empty_recursive(controller, p, ignore_self);
- free(p);
-
- 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;
- }
-
- if (controller)
- *controller = NULL;
-
- return 0;
- }
-
- 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;
- }
-
- if (e[1] != '/' ||
- e == spec ||
- memchr(spec, '/', e-spec))
- return -EINVAL;
-
- 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_join_spec(const char *controller, const char *path, char **spec) {
- assert(controller);
- assert(path);
-
- 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_startswith(path, "/sys/fs/cgroup") &&
- access(path, F_OK) >= 0) {
-
- t = strdup(path);
- if (!t)
- return -ENOMEM;
-
- *result = t;
- return 0;
- }
-
- /* Otherwise treat it as cg spec */
- r = cg_split_spec(path, &c, &p);
- if (r < 0)
- return r;
-
- r = cg_get_path(c ? c : SYSTEMD_CGROUP_CONTROLLER, p ? p : "/", NULL, result);
- free(c);
- free(p);
-
- return r;
-}
-
-int cg_get_user_path(char **path) {
- char *root, *p;
-
- assert(path);
-
- /* Figure out the place to put user cgroups below. We use the
- * same as PID 1 has but with the "/system" suffix replaced by
- * "/user" */
-
- if (cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 1, &root) < 0)
- p = strdup("/user");
- else {
- if (endswith(root, "/system"))
- root[strlen(root) - 7] = 0;
- else if (streq(root, "/"))
- root[0] = 0;
-
- p = strappend(root, "/user");
- free(root);
- }
+bool cg_controller_is_valid(const char *p, bool allow_named) {
+ const char *t, *s;
if (!p)
- return -ENOMEM;
-
- *path = p;
- return 0;
-}
-
-char **cg_shorten_controllers(char **controllers) {
- char **f, **t;
-
- controllers = strv_uniq(controllers);
-
- if (!controllers)
- return controllers;
-
- for (f = controllers, t = controllers; *f; f++) {
- int r;
- const char *p;
-
- if (streq(*f, "systemd") || streq(*f, SYSTEMD_CGROUP_CONTROLLER)) {
- free(*f);
- continue;
- }
-
- p = normalize_controller(*f);
-
- r = check(p);
- if (r < 0) {
- log_debug("Controller %s is not available, removing from controllers list.", *f);
- free(*f);
- continue;
- }
-
- *(t++) = *f;
- }
-
- *t = NULL;
- return controllers;
-}
-
-int cg_pid_get_cgroup(pid_t pid, char **root, char **cgroup) {
- char *cg_process, *cg_init, *p;
- int r;
-
- assert(pid >= 0);
-
- if (pid == 0)
- pid = getpid();
-
- r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, pid, &cg_process);
- if (r < 0)
- return r;
-
- r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 1, &cg_init);
- if (r < 0) {
- free(cg_process);
- return r;
- }
-
- if (endswith(cg_init, "/system"))
- cg_init[strlen(cg_init)-7] = 0;
- else if (streq(cg_init, "/"))
- cg_init[0] = 0;
-
- if (startswith(cg_process, cg_init))
- p = cg_process + strlen(cg_init);
- else
- p = cg_process;
-
- free(cg_init);
-
- if (cgroup) {
- char* c;
-
- c = strdup(p);
- if (!c) {
- free(cg_process);
- return -ENOMEM;
- }
+ return false;
- *cgroup = c;
+ if (allow_named) {
+ s = startswith(p, "name=");
+ if (s)
+ p = s;
}
- if (root) {
- cg_process[p-cg_process] = 0;
- *root = cg_process;
- } else
- free(cg_process);
-
- return 0;
-}
-
-int cg_pid_get_unit(pid_t pid, char **unit) {
- int r;
- char *cgroup, *p, *at, *b;
- size_t k;
+ if (*p == 0 || *p == '_')
+ return false;
- assert(pid >= 0);
- assert(unit);
+ for (t = p; *t; t++)
+ if (!strchr(CONTROLLER_VALID, *t))
+ return false;
- r = cg_pid_get_cgroup(pid, NULL, &cgroup);
- if (r < 0)
- return r;
-
- if (!startswith(cgroup, "/system/")) {
- free(cgroup);
- return -ENOENT;
- }
-
- p = cgroup + 8;
- k = strcspn(p, "/");
-
- at = memchr(p, '@', k);
- if (at && at[1] == '.') {
- size_t j;
-
- /* This is a templated service */
- if (p[k] != '/') {
- free(cgroup);
- return -EIO;
- }
-
- j = strcspn(p+k+1, "/");
-
- b = malloc(k + j + 1);
-
- if (b) {
- memcpy(b, p, at - p + 1);
- memcpy(b + (at - p) + 1, p + k + 1, j);
- memcpy(b + (at - p) + 1 + j, at + 1, k - (at - p) - 1);
- b[k+j] = 0;
- }
- } else
- b = strndup(p, k);
-
- free(cgroup);
-
- if (!b)
- return -ENOMEM;
-
- *unit = b;
- return 0;
+ if (t - p > FILENAME_MAX)
+ return false;
+ return true;
}
diff --git a/src/libudev/cgroup-util.h b/src/libudev/cgroup-util.h
index 697669deba..11e7308e19 100644
--- a/src/libudev/cgroup-util.h
+++ b/src/libudev/cgroup-util.h
@@ -28,47 +28,26 @@
#include "set.h"
#include "def.h"
+/*
+ * General rules:
+ *
+ * We accept named hierarchies in the syntax "foo" and "name=foo".
+ *
+ * We expect that named hierarchies do not conflict in name with a
+ * kernel hierarchy, modulo the "name=" prefix.
+ *
+ * We always generate "normalized" controller names, i.e. without the
+ * "name=" prefix.
+ *
+ * We require absolute cgroup paths. When returning, we will always
+ * generate paths with multiple adjacent / removed.
+ */
+
int cg_enumerate_processes(const char *controller, const char *path, FILE **_f);
-int cg_enumerate_tasks(const char *controller, const char *path, FILE **_f);
int cg_read_pid(FILE *f, pid_t *_pid);
-int cg_enumerate_subgroups(const char *controller, const char *path, DIR **_d);
-int cg_read_subgroup(DIR *d, char **fn);
-
int cg_kill(const char *controller, const char *path, int sig, bool sigcont, bool ignore_self, Set *s);
-int cg_kill_recursive(const char *controller, const char *path, int sig, bool sigcont, bool ignore_self, bool remove, Set *s);
-int cg_kill_recursive_and_wait(const char *controller, const char *path, bool remove);
-
-int cg_migrate(const char *controller, const char *from, const char *to, bool ignore_self);
-int cg_migrate_recursive(const char *controller, const char *from, const char *to, bool ignore_self, bool remove);
-
-int cg_split_spec(const char *spec, char **controller, char **path);
-int cg_join_spec(const char *controller, const char *path, char **spec);
-int cg_fix_path(const char *path, char **result);
int cg_get_path(const char *controller, const char *path, const char *suffix, char **fs);
-int cg_get_path_and_check(const char *controller, const char *path, const char *suffix, char **fs);
-int cg_get_by_pid(const char *controller, pid_t pid, char **path);
-
-int cg_trim(const char *controller, const char *path, bool delete_root);
-
-int cg_rmdir(const char *controller, const char *path, bool honour_sticky);
-int cg_delete(const char *controller, const char *path);
-
-int cg_create(const char *controller, const char *path);
-int cg_attach(const char *controller, const char *path, pid_t pid);
-int cg_create_and_attach(const char *controller, const char *path, pid_t pid);
-
-int cg_set_group_access(const char *controller, const char *path, mode_t mode, uid_t uid, gid_t gid);
-int cg_set_task_access(const char *controller, const char *path, mode_t mode, uid_t uid, gid_t gid, int sticky);
-
-int cg_install_release_agent(const char *controller, const char *agent);
-
-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);
-
-int cg_get_user_path(char **path);
-int cg_pid_get_cgroup(pid_t pid, char **root, char **cgroup);
-int cg_pid_get_unit(pid_t pid, char **unit);
-char **cg_shorten_controllers(char **controllers);
+bool cg_controller_is_valid(const char *p, bool allow_named);
diff --git a/src/libudev/path-util.h b/src/libudev/path-util.h
index 348157fc10..78413c9aa2 100644
--- a/src/libudev/path-util.h
+++ b/src/libudev/path-util.h
@@ -36,6 +36,7 @@ bool path_equal(const char *a, const char *b) _pure_;
char** path_strv_make_absolute_cwd(char **l);
char** path_strv_canonicalize(char **l);
+char** path_strv_canonicalize_uniq(char **l);
int path_is_mount_point(const char *path, bool allow_symlink);
int path_is_read_only_fs(const char *path);
diff --git a/src/libudev/set.h b/src/libudev/set.h
index 9162e2ae80..8864f7b34e 100644
--- a/src/libudev/set.h
+++ b/src/libudev/set.h
@@ -33,7 +33,15 @@ typedef struct Set Set;
Set *set_new(hash_func_t hash_func, compare_func_t compare_func);
void set_free(Set* s);
+static inline void set_freep(Set **s) {
+ set_free(*s);
+}
+
void set_free_free(Set *s);
+static inline void set_free_freep(Set **s) {
+ set_free_free(*s);
+}
+
Set* set_copy(Set *s);
int set_ensure_allocated(Set **s, hash_func_t hash_func, compare_func_t compare_func);
@@ -69,3 +77,6 @@ char **set_get_strv(Set *s);
#define SET_FOREACH_BACKWARDS(e, s, i) \
for ((i) = ITERATOR_LAST, (e) = set_iterate_backwards((s), &(i)); (e); (e) = set_iterate_backwards((s), &(i)))
+
+#define _cleanup_set_free_ _cleanup_(set_freep)
+#define _cleanup_set_free_free_ _cleanup_(set_free_freep)
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-27 00:35:08 +0000