#include <ftw.h>
#include "cgroup-util.h"
-#include "log.h"
#include "set.h"
#include "macro.h"
#include "util.h"
+#include "formats-util.h"
#include "path-util.h"
-#include "strv.h"
#include "unit-name.h"
#include "fileio.h"
#include "special.h"
#include "mkdir.h"
+#include "login-shared.h"
int cg_enumerate_processes(const char *controller, const char *path, FILE **_f) {
_cleanup_free_ char *fs = NULL;
* tasks list, to properly handle forking processes */
if (!s) {
- s = allocated_set = set_new(trivial_hash_func, trivial_compare_func);
+ s = allocated_set = set_new(NULL);
if (!s)
return -ENOMEM;
}
if (kill(pid, sig) < 0) {
if (ret >= 0 && errno != ESRCH)
ret = -errno;
- } else if (ret == 0) {
-
- if (sigcont)
+ } else {
+ if (sigcont && sig != SIGKILL)
kill(pid, SIGCONT);
- ret = 1;
+ if (ret == 0)
+ ret = 1;
}
done = false;
assert(sig >= 0);
if (!s) {
- s = allocated_set = set_new(trivial_hash_func, trivial_compare_func);
+ s = allocated_set = set_new(NULL);
if (!s)
return -ENOMEM;
}
assert(cto);
assert(pto);
- s = set_new(trivial_hash_func, trivial_compare_func);
+ s = set_new(NULL);
if (!s)
return -ENOMEM;
if (!t)
return -ENOMEM;
- path_kill_slashes(t);
-
- *fs = t;
+ *fs = path_kill_slashes(t);
return 0;
}
int cg_get_path(const char *controller, const char *path, const char *suffix, char **fs) {
const char *p;
- static __thread bool good = false;
+ static thread_local bool good = false;
assert(fs);
int r;
r = path_is_mount_point("/sys/fs/cgroup", false);
- if (r <= 0)
- return r < 0 ? r : -ENOENT;
+ if (r < 0)
+ return r;
+ if (r == 0)
+ return -ENOENT;
/* Cache this to save a few stat()s */
good = true;
}
static int check_hierarchy(const char *p) {
- char *cc;
+ const char *cc;
assert(p);
+ if (!filename_is_valid(p))
+ return 0;
+
/* Check if this controller actually really exists */
- cc = alloca(sizeof("/sys/fs/cgroup/") + strlen(p));
- strcpy(stpcpy(cc, "/sys/fs/cgroup/"), p);
- if (access(cc, F_OK) < 0)
+ cc = strjoina("/sys/fs/cgroup/", p);
+ if (laccess(cc, F_OK) < 0)
return -errno;
return 0;
if (pid == 0)
pid = getpid();
- snprintf(c, sizeof(c), "%lu\n", (unsigned long) pid);
+ snprintf(c, sizeof(c), PID_FMT"\n", pid);
- return write_string_file(fs, c);
+ return write_string_file_no_create(fs, c);
}
int cg_attach_fallback(const char *controller, const char *path, pid_t pid) {
assert(path);
- if (mode != (mode_t) -1)
+ if (mode != MODE_INVALID)
mode &= 0777;
r = cg_get_path(controller, path, NULL, &fs);
assert(path);
- if (mode == (mode_t) -1 && uid == (uid_t) -1 && gid == (gid_t) -1)
+ if (mode == MODE_INVALID && uid == UID_INVALID && gid == GID_INVALID)
return 0;
- if (mode != (mode_t) -1)
+ if (mode != MODE_INVALID)
mode &= 0666;
r = cg_get_path(controller, path, "cgroup.procs", &fs);
} else
controller = SYSTEMD_CGROUP_CONTROLLER;
- if (pid == 0)
- fs = "/proc/self/cgroup";
- else
- fs = procfs_file_alloca(pid, "cgroup");
+ fs = procfs_file_alloca(pid, "cgroup");
f = fopen(fs, "re");
if (!f)
cs = strlen(controller);
FOREACH_LINE(line, f, return -errno) {
- char *l, *p, *w, *e;
+ char *l, *p, *e;
size_t k;
- char *state;
+ const char *word, *state;
bool found = false;
truncate_nl(line);
*e = 0;
- FOREACH_WORD_SEPARATOR(w, k, l, ",", state) {
+ FOREACH_WORD_SEPARATOR(word, k, l, ",", state) {
- if (k == cs && memcmp(w, controller, cs) == 0) {
+ if (k == cs && memcmp(word, controller, cs) == 0) {
found = true;
break;
}
if (k == 5 + cs &&
- memcmp(w, "name=", 5) == 0 &&
- memcmp(w+5, controller, cs) == 0) {
+ memcmp(word, "name=", 5) == 0 &&
+ memcmp(word+5, controller, cs) == 0) {
found = true;
break;
}
sc = strstrip(contents);
if (sc[0] == 0) {
- r = write_string_file(fs, agent);
+ r = write_string_file_no_create(fs, agent);
if (r < 0)
return r;
} else if (!streq(sc, agent))
sc = strstrip(contents);
if (streq(sc, "0")) {
- r = write_string_file(fs, "1");
+ r = write_string_file_no_create(fs, "1");
if (r < 0)
return r;
if (r < 0)
return r;
- r = write_string_file(fs, "0");
+ r = write_string_file_no_create(fs, "0");
if (r < 0)
return r;
if (r < 0)
return r;
- r = write_string_file(fs, "");
+ r = write_string_file_no_create(fs, "");
if (r < 0)
return r;
if (!t)
return -ENOMEM;
- path_kill_slashes(t);
- *path = t;
+ *path = path_kill_slashes(t);
}
if (controller)
assert(path);
assert(result);
- /* First check if it already is a filesystem path */
+ /* First, check if it already is a filesystem path */
if (path_startswith(path, "/sys/fs/cgroup")) {
t = strdup(path);
if (!t)
return -ENOMEM;
- path_kill_slashes(t);
- *result = t;
+ *result = path_kill_slashes(t);
return 0;
}
- /* Otherwise treat it as cg spec */
+ /* Otherwise, treat it as cg spec */
r = cg_split_spec(path, &c, &p);
if (r < 0)
return r;
return 0;
}
-int cg_pid_get_path_shifted(pid_t pid, const char *root, char **cgroup) {
- _cleanup_free_ char *cg_root = NULL;
- char *cg_process, *p;
+int cg_shift_path(const char *cgroup, const char *root, const char **shifted) {
+ _cleanup_free_ char *rt = NULL;
+ char *p;
int r;
- assert(pid >= 0);
assert(cgroup);
+ assert(shifted);
if (!root) {
/* If the root was specified let's use that, otherwise
* let's determine it from PID 1 */
- r = cg_get_root_path(&cg_root);
+ r = cg_get_root_path(&rt);
if (r < 0)
return r;
- root = cg_root;
+ root = rt;
}
- r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, pid, &cg_process);
+ p = path_startswith(cgroup, root);
+ if (p)
+ *shifted = p - 1;
+ else
+ *shifted = cgroup;
+
+ return 0;
+}
+
+int cg_pid_get_path_shifted(pid_t pid, const char *root, char **cgroup) {
+ _cleanup_free_ char *raw = NULL;
+ const char *c;
+ int r;
+
+ assert(pid >= 0);
+ assert(cgroup);
+
+ r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, pid, &raw);
if (r < 0)
return r;
- p = path_startswith(cg_process, root);
- if (p) {
- char *c;
+ r = cg_shift_path(raw, root, &c);
+ if (r < 0)
+ return r;
- c = strdup(p - 1);
- free(cg_process);
+ if (c == raw) {
+ *cgroup = raw;
+ raw = NULL;
+ } else {
+ char *n;
- if (!c)
+ n = strdup(c);
+ if (!n)
return -ENOMEM;
- *cgroup = c;
- } else
- *cgroup = cg_process;
+ *cgroup = n;
+ }
return 0;
}
int cg_path_decode_unit(const char *cgroup, char **unit){
- char *e, *c, *s;
+ char *c, *s;
+ size_t n;
assert(cgroup);
assert(unit);
- e = strchrnul(cgroup, '/');
- c = strndupa(cgroup, e - cgroup);
+ n = strcspn(cgroup, "/");
+ if (n < 3)
+ return -ENXIO;
+
+ c = strndupa(cgroup, n);
c = cg_unescape(c);
- if (!unit_name_is_valid(c, false))
- return -EINVAL;
+ if (!unit_name_is_valid(c, TEMPLATE_INVALID))
+ return -ENXIO;
s = strdup(c);
if (!s)
return 0;
}
+static bool valid_slice_name(const char *p, size_t n) {
+
+ if (!p)
+ return false;
+
+ if (n < strlen("x.slice"))
+ return false;
+
+ if (memcmp(p + n - 6, ".slice", 6) == 0) {
+ char buf[n+1], *c;
+
+ memcpy(buf, p, n);
+ buf[n] = 0;
+
+ c = cg_unescape(buf);
+
+ return unit_name_is_valid(c, TEMPLATE_INVALID);
+ }
+
+ return false;
+}
+
static const char *skip_slices(const char *p) {
+ assert(p);
+
/* Skips over all slice assignments */
for (;;) {
p += strspn(p, "/");
n = strcspn(p, "/");
- if (n <= 6 || memcmp(p + n - 6, ".slice", 6) != 0)
+ if (!valid_slice_name(p, n))
return p;
p += n;
}
}
-int cg_path_get_unit(const char *path, char **unit) {
+int cg_path_get_unit(const char *path, char **ret) {
const char *e;
+ char *unit;
+ int r;
assert(path);
- assert(unit);
+ assert(ret);
e = skip_slices(path);
- return cg_path_decode_unit(e, unit);
+ r = cg_path_decode_unit(e, &unit);
+ if (r < 0)
+ return r;
+
+ /* We skipped over the slices, don't accept any now */
+ if (endswith(unit, ".slice")) {
+ free(unit);
+ return -ENXIO;
+ }
+
+ *ret = unit;
+ return 0;
}
int cg_pid_get_unit(pid_t pid, char **unit) {
return cg_path_get_unit(cgroup, unit);
}
+/**
+ * Skip session-*.scope, but require it to be there.
+ */
static const char *skip_session(const char *p) {
size_t n;
- assert(p);
+ if (isempty(p))
+ return NULL;
p += strspn(p, "/");
n = strcspn(p, "/");
- if (n <= 12 || memcmp(p, "session-", 8) != 0 || memcmp(p + n - 6, ".scope", 6) != 0)
+ if (n < strlen("session-x.scope"))
+ return NULL;
+
+ if (memcmp(p, "session-", 8) == 0 && memcmp(p + n - 6, ".scope", 6) == 0) {
+ char buf[n - 8 - 6 + 1];
+
+ memcpy(buf, p + 8, n - 8 - 6);
+ buf[n - 8 - 6] = 0;
+
+ /* Note that session scopes never need unescaping,
+ * since they cannot conflict with the kernel's own
+ * names, hence we don't need to call cg_unescape()
+ * here. */
+
+ if (!session_id_valid(buf))
+ return false;
+
+ p += n;
+ p += strspn(p, "/");
+ return p;
+ }
+
+ return NULL;
+}
+
+/**
+ * Skip user@*.service, but require it to be there.
+ */
+static const char *skip_user_manager(const char *p) {
+ size_t n;
+
+ if (isempty(p))
return NULL;
- p += n;
p += strspn(p, "/");
- return p;
+ n = strcspn(p, "/");
+ if (n < strlen("user@x.service"))
+ return NULL;
+
+ if (memcmp(p, "user@", 5) == 0 && memcmp(p + n - 8, ".service", 8) == 0) {
+ char buf[n - 5 - 8 + 1];
+
+ memcpy(buf, p + 5, n - 5 - 8);
+ buf[n - 5 - 8] = 0;
+
+ /* Note that user manager services never need unescaping,
+ * since they cannot conflict with the kernel's own
+ * names, hence we don't need to call cg_unescape()
+ * here. */
+
+ if (parse_uid(buf, NULL) < 0)
+ return NULL;
+
+ p += n;
+ p += strspn(p, "/");
+
+ return p;
+ }
+
+ return NULL;
}
-int cg_path_get_user_unit(const char *path, char **unit) {
- const char *e;
+static const char *skip_user_prefix(const char *path) {
+ const char *e, *t;
assert(path);
- assert(unit);
-
- /* We always have to parse the path from the beginning as unit
- * cgroups might have arbitrary child cgroups and we shouldn't get
- * confused by those */
/* Skip slices, if there are any */
e = skip_slices(path);
- /* Skip the session scope, require that there is one */
- e = skip_session(e);
- if (!e)
- return -ENOENT;
+ /* Skip the user manager, if it's in the path now... */
+ t = skip_user_manager(e);
+ if (t)
+ return t;
+
+ /* Alternatively skip the user session if it is in the path... */
+ return skip_session(e);
+}
- /* And skip more slices */
- e = skip_slices(e);
+int cg_path_get_user_unit(const char *path, char **ret) {
+ const char *t;
- return cg_path_decode_unit(e, unit);
+ assert(path);
+ assert(ret);
+
+ t = skip_user_prefix(path);
+ if (!t)
+ return -ENXIO;
+
+ /* And from here on it looks pretty much the same as for a
+ * system unit, hence let's use the same parser from here
+ * on. */
+ return cg_path_get_unit(t, ret);
}
int cg_pid_get_user_unit(pid_t pid, char **unit) {
}
int cg_path_get_machine_name(const char *path, char **machine) {
- const char *e, *n, *x;
- char *s, *r;
- size_t l;
-
- assert(path);
- assert(machine);
-
- /* Skip slices, if there are any */
- e = skip_slices(path);
-
- n = strchrnul(e, '/');
- if (e == n)
- return -ENOENT;
-
- s = strndupa(e, n - e);
- s = cg_unescape(s);
-
- x = startswith(s, "machine-");
- if (!x)
- return -ENOENT;
- if (!endswith(x, ".scope"))
- return -ENOENT;
+ _cleanup_free_ char *u = NULL, *sl = NULL;
+ int r;
- l = strlen(x);
- if (l <= 6)
- return -ENOENT;
+ r = cg_path_get_unit(path, &u);
+ if (r < 0)
+ return r;
- r = strndup(x, l - 6);
- if (!r)
+ sl = strjoin("/run/systemd/machines/unit:", u, NULL);
+ if (!sl)
return -ENOMEM;
- *machine = r;
- return 0;
+ return readlink_malloc(sl, machine);
}
int cg_pid_get_machine_name(pid_t pid, char **machine) {
}
int cg_path_get_session(const char *path, char **session) {
- const char *e, *n, *x;
- char *s, *r;
- size_t l;
+ _cleanup_free_ char *unit = NULL;
+ char *start, *end;
+ int r;
assert(path);
- assert(session);
- /* Skip slices, if there are any */
- e = skip_slices(path);
+ r = cg_path_get_unit(path, &unit);
+ if (r < 0)
+ return r;
- n = strchrnul(e, '/');
- if (e == n)
- return -ENOENT;
+ start = startswith(unit, "session-");
+ if (!start)
+ return -ENXIO;
+ end = endswith(start, ".scope");
+ if (!end)
+ return -ENXIO;
- s = strndupa(e, n - e);
- s = cg_unescape(s);
+ *end = 0;
+ if (!session_id_valid(start))
+ return -ENXIO;
- x = startswith(s, "session-");
- if (!x)
- return -ENOENT;
- if (!endswith(x, ".scope"))
- return -ENOENT;
+ if (session) {
+ char *rr;
- l = strlen(x);
- if (l <= 6)
- return -ENOENT;
+ rr = strdup(start);
+ if (!rr)
+ return -ENOMEM;
- r = strndup(x, l - 6);
- if (!r)
- return -ENOMEM;
+ *session = rr;
+ }
- *session = r;
return 0;
}
_cleanup_free_ char *cgroup = NULL;
int r;
- assert(session);
-
r = cg_pid_get_path_shifted(pid, NULL, &cgroup);
if (r < 0)
return r;
int cg_path_get_owner_uid(const char *path, uid_t *uid) {
_cleanup_free_ char *slice = NULL;
- const char *start, *end;
- char *s;
- uid_t u;
+ char *start, *end;
int r;
assert(path);
start = startswith(slice, "user-");
if (!start)
- return -ENOENT;
- end = endswith(slice, ".slice");
+ return -ENXIO;
+ end = endswith(start, ".slice");
if (!end)
- return -ENOENT;
+ return -ENXIO;
- s = strndupa(start, end - start);
- if (!s)
- return -ENOENT;
-
- if (parse_uid(s, &u) < 0)
- return -EIO;
-
- if (uid)
- *uid = u;
+ *end = 0;
+ if (parse_uid(start, uid) < 0)
+ return -ENXIO;
return 0;
}
int cg_path_get_slice(const char *p, char **slice) {
const char *e = NULL;
- size_t m = 0;
assert(p);
assert(slice);
+ /* Finds the right-most slice unit from the beginning, but
+ * stops before we come to the first non-slice unit. */
+
for (;;) {
size_t n;
p += strspn(p, "/");
n = strcspn(p, "/");
- if (n <= 6 || memcmp(p + n - 6, ".slice", 6) != 0) {
- char *s;
+ if (!valid_slice_name(p, n)) {
- if (!e)
- return -ENOENT;
+ if (!e) {
+ char *s;
- s = strndup(e, m);
- if (!s)
- return -ENOMEM;
+ s = strdup("-.slice");
+ if (!s)
+ return -ENOMEM;
- *slice = s;
- return 0;
+ *slice = s;
+ return 0;
+ }
+
+ return cg_path_decode_unit(e, slice);
}
e = p;
- m = n;
-
p += n;
}
}
return cg_path_get_slice(cgroup, slice);
}
+int cg_path_get_user_slice(const char *p, char **slice) {
+ const char *t;
+ assert(p);
+ assert(slice);
+
+ t = skip_user_prefix(p);
+ if (!t)
+ return -ENXIO;
+
+ /* And now it looks pretty much the same as for a system
+ * slice, so let's just use the same parser from here on. */
+ return cg_path_get_slice(t, slice);
+}
+
+int cg_pid_get_user_slice(pid_t pid, char **slice) {
+ _cleanup_free_ char *cgroup = NULL;
+ int r;
+
+ assert(slice);
+
+ r = cg_pid_get_path_shifted(pid, NULL, &cgroup);
+ if (r < 0)
+ return r;
+
+ return cg_path_get_user_slice(cgroup, slice);
+}
+
char *cg_escape(const char *p) {
bool need_prefix = false;
assert(unit);
assert(ret);
- if (!unit_name_is_valid(unit, false))
+ if (streq(unit, "-.slice")) {
+ char *x;
+
+ x = strdup("");
+ if (!x)
+ return -ENOMEM;
+ *ret = x;
+ return 0;
+ }
+
+ if (!unit_name_is_valid(unit, TEMPLATE_INVALID))
return -EINVAL;
if (!endswith(unit, ".slice"))
_cleanup_free_ char *escaped = NULL;
char n[dash - p + sizeof(".slice")];
- strcpy(stpncpy(n, p, dash - p), ".slice");
+ if (isempty(dash + 1))
+ return -EINVAL;
- if (!unit_name_is_valid(n, false))
+ strcpy(stpncpy(n, p, dash - p), ".slice");
+ if (!unit_name_is_valid(n, TEMPLATE_INVALID))
return -EINVAL;
escaped = cg_escape(n);
if (r < 0)
return r;
- return write_string_file(p, value);
+ return write_string_file_no_create(p, value);
+}
+
+int cg_get_attribute(const char *controller, const char *path, const char *attribute, char **ret) {
+ _cleanup_free_ char *p = NULL;
+ int r;
+
+ r = cg_get_path(controller, path, attribute, &p);
+ if (r < 0)
+ return r;
+
+ return read_one_line_file(p, ret);
}
static const char mask_names[] =
return 0;
}
-int cg_attach_everywhere(CGroupControllerMask supported, const char *path, pid_t pid) {
+int cg_attach_everywhere(CGroupControllerMask supported, const char *path, pid_t pid, cg_migrate_callback_t path_callback, void *userdata) {
CGroupControllerMask bit = 1;
const char *n;
int r;
return r;
NULSTR_FOREACH(n, mask_names) {
- if (supported & bit)
+
+ if (supported & bit) {
+ const char *p = NULL;
+
+ if (path_callback)
+ p = path_callback(bit, userdata);
+
+ if (!p)
+ p = path;
+
cg_attach_fallback(n, path, pid);
+ }
bit <<= 1;
}
return 0;
}
-int cg_attach_many_everywhere(CGroupControllerMask supported, const char *path, Set* pids) {
+int cg_attach_many_everywhere(CGroupControllerMask supported, const char *path, Set* pids, cg_migrate_callback_t path_callback, void *userdata) {
Iterator i;
void *pidp;
int r = 0;
pid_t pid = PTR_TO_LONG(pidp);
int q;
- q = cg_attach_everywhere(supported, path, pid);
+ q = cg_attach_everywhere(supported, path, pid, path_callback, userdata);
if (q < 0)
r = q;
}
return r;
}
-int cg_migrate_everywhere(CGroupControllerMask supported, const char *from, const char *to) {
+int cg_migrate_everywhere(CGroupControllerMask supported, const char *from, const char *to, cg_migrate_callback_t to_callback, void *userdata) {
CGroupControllerMask bit = 1;
const char *n;
int r;
}
NULSTR_FOREACH(n, mask_names) {
- if (supported & bit)
- cg_migrate_recursive_fallback(SYSTEMD_CGROUP_CONTROLLER, to, n, to, false, false);
+ if (supported & bit) {
+ const char *p = NULL;
+
+ if (to_callback)
+ p = to_callback(bit, userdata);
+
+ if (!p)
+ p = to;
+
+ cg_migrate_recursive_fallback(SYSTEMD_CGROUP_CONTROLLER, to, n, p, false, false);
+ }
bit <<= 1;
}
return mask;
}
+
+int cg_kernel_controllers(Set *controllers) {
+ _cleanup_fclose_ FILE *f = NULL;
+ char buf[LINE_MAX];
+ int r;
+
+ assert(controllers);
+
+ f = fopen("/proc/cgroups", "re");
+ if (!f) {
+ if (errno == ENOENT)
+ return 0;
+ return -errno;
+ }
+
+ /* Ignore the header line */
+ (void) fgets(buf, sizeof(buf), f);
+
+ for (;;) {
+ char *controller;
+ int enabled = 0;
+
+ errno = 0;
+ if (fscanf(f, "%ms %*i %*i %i", &controller, &enabled) != 2) {
+
+ if (feof(f))
+ break;
+
+ if (ferror(f) && errno)
+ return -errno;
+
+ return -EBADMSG;
+ }
+
+ if (!enabled) {
+ free(controller);
+ continue;
+ }
+
+ if (!filename_is_valid(controller)) {
+ free(controller);
+ return -EBADMSG;
+ }
+
+ r = set_consume(controllers, controller);
+ if (r < 0)
+ return r;
+ }
+
+ return 0;
+}
~ianmdlvl / elogind.git / blobdiff