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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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This file is part of systemd.
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Copyright 2011 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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#include <sys/inotify.h>
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#include "cgroup-util.h"
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static int pid_get_cgroup(pid_t pid, char **root, char **cgroup) {
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char *cg_process, *cg_init, *p;
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r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, pid, &cg_process);
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r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 1, &cg_init);
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if (endswith(cg_init, "/system"))
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cg_init[strlen(cg_init)-7] = 0;
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else if (streq(cg_init, "/"))
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if (startswith(cg_process, cg_init))
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p = cg_process + strlen(cg_init);
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cg_process[p-cg_process] = 0;
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_public_ int sd_pid_get_session(pid_t pid, char **session) {
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r = pid_get_cgroup(pid, NULL, &cgroup);
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if (!startswith(cgroup, "/user/")) {
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p = strchr(cgroup + 6, '/');
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if (startswith(p, "shared/") || streq(p, "shared")) {
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p = strndup(p, strcspn(p, "/"));
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_public_ int sd_pid_get_owner_uid(pid_t pid, uid_t *uid) {
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char *root, *cgroup, *p, *cc;
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r = pid_get_cgroup(pid, &root, &cgroup);
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if (!startswith(cgroup, "/user/")) {
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p = strchr(cgroup + 6, '/');
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p += strcspn(p, "/");
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r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, root, cgroup, &cc);
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if (!S_ISDIR(st.st_mode))
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_public_ int sd_uid_get_state(uid_t uid, char**state) {
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if (asprintf(&p, "/run/systemd/users/%lu", (unsigned long) uid) < 0)
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r = parse_env_file(p, NEWLINE, "STATE", &s, NULL);
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s = strdup("offline");
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_public_ int sd_uid_is_on_seat(uid_t uid, int require_active, const char *seat) {
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char *p, *w, *t, *state, *s = NULL;
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const char *variable;
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variable = require_active ? "ACTIVE_UID" : "UIDS";
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p = strappend("/run/systemd/seats/", seat);
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r = parse_env_file(p, NEWLINE, variable, &s, NULL);
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if (asprintf(&t, "%lu", (unsigned long) uid) < 0) {
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FOREACH_WORD(w, l, s, state) {
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if (strncmp(t, w, l) == 0) {
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static int uid_get_array(uid_t uid, const char *variable, char ***array) {
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if (asprintf(&p, "/run/systemd/users/%lu", (unsigned long) uid) < 0)
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r = parse_env_file(p, NEWLINE,
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a = strv_split(s, " ");
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_public_ int sd_uid_get_sessions(uid_t uid, int require_active, char ***sessions) {
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return uid_get_array(uid, require_active ? "ACTIVE_SESSIONS" : "SESSIONS", sessions);
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_public_ int sd_uid_get_seats(uid_t uid, int require_active, char ***seats) {
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return uid_get_array(uid, require_active ? "ACTIVE_SEATS" : "SEATS", seats);
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_public_ int sd_session_is_active(const char *session) {
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p = strappend("/run/systemd/sessions/", session);
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r = parse_env_file(p, NEWLINE, "ACTIVE", &s, NULL);
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r = parse_boolean(s);
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_public_ int sd_session_get_uid(const char *session, uid_t *uid) {
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p = strappend("/run/systemd/sessions/", session);
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r = parse_env_file(p, NEWLINE, "UID", &s, NULL);
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r = parse_uid(s, uid);
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_public_ int sd_session_get_seat(const char *session, char **seat) {
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p = strappend("/run/systemd/sessions/", session);
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r = parse_env_file(p, NEWLINE, "SEAT", &s, NULL);
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_public_ int sd_seat_get_active(const char *seat, char **session, uid_t *uid) {
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char *p, *s = NULL, *t = NULL;
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if (!session && !uid)
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p = strappend("/run/systemd/seats/", seat);
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r = parse_env_file(p, NEWLINE,
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r = parse_uid(t, uid);
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_public_ int sd_seat_get_sessions(const char *seat, char ***sessions, uid_t **uids, unsigned *n_uids) {
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char *p, *s = NULL, *t = NULL, **a = NULL;
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p = strappend("/run/systemd/seats/", seat);
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r = parse_env_file(p, NEWLINE,
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"ACTIVE_SESSIONS", &t,
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a = strv_split(s, " ");
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FOREACH_WORD(w, l, t, state)
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FOREACH_WORD(w, l, t, state) {
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r = parse_uid(k, b + i);
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_public_ int sd_seat_can_multi_session(const char *seat) {
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p = strappend("/run/systemd/seats/", seat);
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r = parse_env_file(p, NEWLINE,
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r = parse_boolean(s);
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_public_ int sd_get_seats(char ***seats) {
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return get_files_in_directory("/run/systemd/seats/", seats);
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_public_ int sd_get_sessions(char ***sessions) {
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return get_files_in_directory("/run/systemd/sessions/", sessions);
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_public_ int sd_get_uids(uid_t **users) {
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d = opendir("/run/systemd/users/");
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struct dirent buffer, *de;
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k = readdir_r(d, &buffer, &de);
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dirent_ensure_type(d, de);
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if (!dirent_is_file(de))
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k = parse_uid(de->d_name, &uid);
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if ((unsigned) r >= n) {
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t = realloc(l, sizeof(uid_t) * n);
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assert((unsigned) r < n);
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static inline int MONITOR_TO_FD(sd_login_monitor *m) {
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return (int) (unsigned long) m - 1;
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static inline sd_login_monitor* FD_TO_MONITOR(int fd) {
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return (sd_login_monitor*) (unsigned long) (fd + 1);
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_public_ int sd_login_monitor_new(const char *category, sd_login_monitor **m) {
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fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC);
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if (!category || streq(category, "seat")) {
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k = inotify_add_watch(fd, "/run/systemd/seats/", IN_MOVED_TO|IN_DELETE);
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close_nointr_nofail(fd);
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if (!category || streq(category, "session")) {
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k = inotify_add_watch(fd, "/run/systemd/sessions/", IN_MOVED_TO|IN_DELETE);
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close_nointr_nofail(fd);
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if (!category || streq(category, "uid")) {
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k = inotify_add_watch(fd, "/run/systemd/users/", IN_MOVED_TO|IN_DELETE);
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close_nointr_nofail(fd);
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*m = FD_TO_MONITOR(fd);
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_public_ sd_login_monitor* sd_login_monitor_unref(sd_login_monitor *m) {
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fd = MONITOR_TO_FD(m);
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_public_ int sd_login_monitor_flush(sd_login_monitor *m) {
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return flush_fd(MONITOR_TO_FD(m));
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_public_ int sd_login_monitor_get_fd(sd_login_monitor *m) {
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return MONITOR_TO_FD(m);
added
removed
src/sd-login.c
