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login: add an api to determine the slice a PID is located in to libsystemd-login
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ed002560a1
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1021b21bc6
@ -75,3 +75,8 @@ LIBSYSTEMD_LOGIN_203 {
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global:
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sd_get_machine_names;
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} LIBSYSTEMD_LOGIN_202;
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LIBSYSTEMD_LOGIN_204 {
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global:
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sd_pid_get_slice;
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} LIBSYSTEMD_LOGIN_203;
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@ -72,6 +72,16 @@ _public_ int sd_pid_get_machine_name(pid_t pid, char **name) {
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return cg_pid_get_machine_name(pid, name);
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}
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_public_ int sd_pid_get_slice(pid_t pid, char **slice) {
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if (pid < 0)
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return -EINVAL;
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if (!slice)
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return -EINVAL;
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return cg_pid_get_slice(pid, slice);
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}
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_public_ int sd_pid_get_owner_uid(pid_t pid, uid_t *uid) {
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if (pid < 0)
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@ -1227,11 +1227,11 @@ int cg_path_decode_unit(const char *cgroup, char **unit){
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}
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static const char *skip_slices(const char *p) {
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size_t n;
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/* Skips over all slice assignments */
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for (;;) {
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size_t n;
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p += strspn(p, "/");
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n = strcspn(p, "/");
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@ -1475,6 +1475,53 @@ int cg_pid_get_owner_uid(pid_t pid, uid_t *uid) {
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return cg_path_get_owner_uid(cgroup, uid);
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}
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int cg_path_get_slice(const char *p, char **slice) {
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const char *e = NULL;
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size_t m = 0;
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assert(p);
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assert(slice);
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for (;;) {
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size_t n;
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p += strspn(p, "/");
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n = strcspn(p, "/");
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if (n <= 6 || memcmp(p + n - 6, ".slice", 6) != 0) {
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char *s;
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if (!e)
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return -ENOENT;
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s = strndup(e, m);
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if (!s)
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return -ENOMEM;
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*slice = s;
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return 0;
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}
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e = p;
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m = n;
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p += n;
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}
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}
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int cg_pid_get_slice(pid_t pid, char **slice) {
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_cleanup_free_ char *cgroup = NULL;
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int r;
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assert(slice);
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r = cg_pid_get_path_shifted(pid, NULL, &cgroup);
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if (r < 0)
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return r;
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return cg_path_get_slice(cgroup, slice);
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}
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int cg_controller_from_attr(const char *attr, char **controller) {
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const char *dot;
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char *c;
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@ -90,6 +90,7 @@ int cg_path_get_owner_uid(const char *path, uid_t *uid);
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int cg_path_get_unit(const char *path, char **unit);
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int cg_path_get_user_unit(const char *path, char **unit);
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int cg_path_get_machine_name(const char *path, char **machine);
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int cg_path_get_slice(const char *path, char **slice);
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int cg_pid_get_path_shifted(pid_t pid, char **root, char **cgroup);
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@ -98,6 +99,7 @@ int cg_pid_get_owner_uid(pid_t pid, uid_t *uid);
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int cg_pid_get_unit(pid_t pid, char **unit);
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int cg_pid_get_user_unit(pid_t pid, char **unit);
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int cg_pid_get_machine_name(pid_t pid, char **machine);
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int cg_pid_get_slice(pid_t pid, char **slice);
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int cg_path_decode_unit(const char *cgroup, char **unit);
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@ -72,9 +72,12 @@ int sd_pid_get_unit(pid_t pid, char **unit);
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int sd_pid_get_user_unit(pid_t pid, char **unit);
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/* Get machine name from PID, for processes assigned to VM or
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* container. This will return an error for non-service processes. */
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* container. This will return an error for non-machine processes. */
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int sd_pid_get_machine_name(pid_t pid, char **name);
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/* Get slice name from PID. */
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int sd_pid_get_slice(pid_t pid, char **name);
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/* Get state from uid. Possible states: offline, lingering, online, active, closing */
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int sd_uid_get_state(uid_t uid, char**state);
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@ -134,7 +134,7 @@ static void test_proc(void) {
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assert_se(d);
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FOREACH_DIRENT(de, d, break) {
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_cleanup_free_ char *path = NULL, *path_shifted = NULL, *session = NULL, *unit = NULL, *user_unit = NULL, *machine = NULL, *prefix = NULL;
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_cleanup_free_ char *path = NULL, *path_shifted = NULL, *session = NULL, *unit = NULL, *user_unit = NULL, *machine = NULL, *prefix = NULL, *slice = NULL;
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pid_t pid;
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uid_t uid = (uid_t) -1;
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@ -156,8 +156,9 @@ static void test_proc(void) {
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cg_pid_get_unit(pid, &unit);
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cg_pid_get_user_unit(pid, &user_unit);
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cg_pid_get_machine_name(pid, &machine);
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cg_pid_get_slice(pid, &slice);
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printf("%lu\t%s\t%s\t%s\t%lu\t%s\t%s\t%s\t%s\n",
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printf("%lu\t%s\t%s\t%s\t%lu\t%s\t%s\t%s\t%s\t%s\n",
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(unsigned long) pid,
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path,
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prefix,
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@ -166,7 +167,8 @@ static void test_proc(void) {
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session,
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unit,
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user_unit,
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machine);
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machine,
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slice);
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}
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}
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