1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2011 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
25 #include <sys/inotify.h>
29 #include "cgroup-util.h"
35 _public_ int sd_pid_get_session(pid_t pid, char **session) {
42 return cg_pid_get_session(pid, session);
45 _public_ int sd_pid_get_unit(pid_t pid, char **unit) {
52 return cg_pid_get_unit(pid, unit);
55 _public_ int sd_pid_get_user_unit(pid_t pid, char **unit) {
62 return cg_pid_get_user_unit(pid, unit);
65 _public_ int sd_pid_get_machine_name(pid_t pid, char **name) {
72 return cg_pid_get_machine_name(pid, name);
75 _public_ int sd_pid_get_owner_uid(pid_t pid, uid_t *uid) {
77 _cleanup_free_ char *root = NULL, *cgroup = NULL, *cc = NULL;
87 r = cg_pid_get_path_shifted(pid, &root, &cgroup);
91 if (!startswith(cgroup, "/user/"))
94 p = strchr(cgroup + 6, '/');
102 r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, root, cgroup, &cc);
112 if (!S_ISDIR(st.st_mode))
119 _public_ int sd_uid_get_state(uid_t uid, char**state) {
126 if (asprintf(&p, "/run/systemd/users/%lu", (unsigned long) uid) < 0)
129 r = parse_env_file(p, NEWLINE, "STATE", &s, NULL);
134 s = strdup("offline");
150 _public_ int sd_uid_is_on_seat(uid_t uid, int require_active, const char *seat) {
152 _cleanup_free_ char *t = NULL, *s = NULL, *p = NULL;
155 const char *variable;
160 variable = require_active ? "ACTIVE_UID" : "UIDS";
162 p = strappend("/run/systemd/seats/", seat);
166 r = parse_env_file(p, NEWLINE, variable, &s, NULL);
174 if (asprintf(&t, "%lu", (unsigned long) uid) < 0)
177 FOREACH_WORD(w, l, s, state) {
185 static int uid_get_array(uid_t uid, const char *variable, char ***array) {
186 _cleanup_free_ char *p = NULL, *s = NULL;
190 if (asprintf(&p, "/run/systemd/users/%lu", (unsigned long) uid) < 0)
193 r = parse_env_file(p, NEWLINE,
212 a = strv_split(s, " ");
228 _public_ int sd_uid_get_sessions(uid_t uid, int require_active, char ***sessions) {
229 return uid_get_array(
231 require_active == 0 ? "ONLINE_SESSIONS" :
232 require_active > 0 ? "ACTIVE_SESSIONS" :
237 _public_ int sd_uid_get_seats(uid_t uid, int require_active, char ***seats) {
238 return uid_get_array(
240 require_active == 0 ? "ONLINE_SEATS" :
241 require_active > 0 ? "ACTIVE_SEATS" :
246 static int file_of_session(const char *session, char **_p) {
253 p = strappend("/run/systemd/sessions/", session);
257 r = sd_pid_get_session(0, &buf);
261 p = strappend("/run/systemd/sessions/", buf);
272 _public_ int sd_session_is_active(const char *session) {
274 _cleanup_free_ char *p = NULL, *s = NULL;
276 r = file_of_session(session, &p);
280 r = parse_env_file(p, NEWLINE, "ACTIVE", &s, NULL);
288 r = parse_boolean(s);
293 _public_ int sd_session_get_state(const char *session, char **state) {
294 _cleanup_free_ char *p = NULL, *s = NULL;
300 r = file_of_session(session, &p);
304 r = parse_env_file(p, NEWLINE, "STATE", &s, NULL);
317 _public_ int sd_session_get_uid(const char *session, uid_t *uid) {
319 _cleanup_free_ char *p = NULL, *s = NULL;
324 r = file_of_session(session, &p);
328 r = parse_env_file(p, NEWLINE, "UID", &s, NULL);
336 r = parse_uid(s, uid);
341 static int session_get_string(const char *session, const char *field, char **value) {
342 _cleanup_free_ char *p = NULL, *s = NULL;
348 r = file_of_session(session, &p);
352 r = parse_env_file(p, NEWLINE, field, &s, NULL);
365 _public_ int sd_session_get_seat(const char *session, char **seat) {
366 return session_get_string(session, "SEAT", seat);
369 _public_ int sd_session_get_tty(const char *session, char **tty) {
370 return session_get_string(session, "TTY", tty);
373 _public_ int sd_session_get_service(const char *session, char **service) {
374 return session_get_string(session, "SERVICE", service);
377 _public_ int sd_session_get_type(const char *session, char **type) {
378 return session_get_string(session, "TYPE", type);
381 _public_ int sd_session_get_class(const char *session, char **class) {
382 return session_get_string(session, "CLASS", class);
385 _public_ int sd_session_get_display(const char *session, char **display) {
386 return session_get_string(session, "DISPLAY", display);
389 static int file_of_seat(const char *seat, char **_p) {
396 p = strappend("/run/systemd/seats/", seat);
398 _cleanup_free_ char *buf = NULL;
400 r = sd_session_get_seat(NULL, &buf);
404 p = strappend("/run/systemd/seats/", buf);
415 _public_ int sd_seat_get_active(const char *seat, char **session, uid_t *uid) {
416 _cleanup_free_ char *p = NULL, *s = NULL, *t = NULL;
419 if (!session && !uid)
422 r = file_of_seat(seat, &p);
426 r = parse_env_file(p, NEWLINE,
440 r = parse_uid(t, uid);
453 _public_ int sd_seat_get_sessions(const char *seat, char ***sessions, uid_t **uids, unsigned *n_uids) {
454 _cleanup_free_ char *p = NULL, *s = NULL, *t = NULL;
455 _cleanup_strv_free_ char **a = NULL;
456 _cleanup_free_ uid_t *b = NULL;
460 r = file_of_seat(seat, &p);
464 r = parse_env_file(p, NEWLINE,
466 "ACTIVE_SESSIONS", &t,
473 a = strv_split(s, " ");
482 FOREACH_WORD(w, l, t, state)
492 FOREACH_WORD(w, l, t, state) {
493 _cleanup_free_ char *k = NULL;
499 r = parse_uid(k, b + i);
527 static int seat_get_can(const char *seat, const char *variable) {
528 _cleanup_free_ char *p = NULL, *s = NULL;
531 r = file_of_seat(seat, &p);
535 r = parse_env_file(p, NEWLINE,
542 r = parse_boolean(s);
549 _public_ int sd_seat_can_multi_session(const char *seat) {
550 return seat_get_can(seat, "CAN_MULTI_SESSION");
553 _public_ int sd_seat_can_tty(const char *seat) {
554 return seat_get_can(seat, "CAN_TTY");
557 _public_ int sd_seat_can_graphical(const char *seat) {
558 return seat_get_can(seat, "CAN_GRAPHICAL");
561 _public_ int sd_get_seats(char ***seats) {
562 return get_files_in_directory("/run/systemd/seats/", seats);
565 _public_ int sd_get_sessions(char ***sessions) {
566 return get_files_in_directory("/run/systemd/sessions/", sessions);
569 _public_ int sd_get_uids(uid_t **users) {
570 _cleanup_closedir_ DIR *d;
573 _cleanup_free_ uid_t *l = NULL;
575 d = opendir("/run/systemd/users/");
581 union dirent_storage buf;
585 k = readdir_r(d, &buf.de, &de);
592 dirent_ensure_type(d, de);
594 if (!dirent_is_file(de))
597 k = parse_uid(de->d_name, &uid);
602 if ((unsigned) r >= n) {
606 t = realloc(l, sizeof(uid_t) * n);
613 assert((unsigned) r < n);
627 static inline int MONITOR_TO_FD(sd_login_monitor *m) {
628 return (int) (unsigned long) m - 1;
631 static inline sd_login_monitor* FD_TO_MONITOR(int fd) {
632 return (sd_login_monitor*) (unsigned long) (fd + 1);
635 _public_ int sd_login_monitor_new(const char *category, sd_login_monitor **m) {
642 fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC);
646 if (!category || streq(category, "seat")) {
647 k = inotify_add_watch(fd, "/run/systemd/seats/", IN_MOVED_TO|IN_DELETE);
649 close_nointr_nofail(fd);
656 if (!category || streq(category, "session")) {
657 k = inotify_add_watch(fd, "/run/systemd/sessions/", IN_MOVED_TO|IN_DELETE);
659 close_nointr_nofail(fd);
666 if (!category || streq(category, "uid")) {
667 k = inotify_add_watch(fd, "/run/systemd/users/", IN_MOVED_TO|IN_DELETE);
669 close_nointr_nofail(fd);
681 *m = FD_TO_MONITOR(fd);
685 _public_ sd_login_monitor* sd_login_monitor_unref(sd_login_monitor *m) {
691 fd = MONITOR_TO_FD(m);
697 _public_ int sd_login_monitor_flush(sd_login_monitor *m) {
702 return flush_fd(MONITOR_TO_FD(m));
705 _public_ int sd_login_monitor_get_fd(sd_login_monitor *m) {
710 return MONITOR_TO_FD(m);
713 _public_ int sd_login_monitor_get_events(sd_login_monitor *m) {
718 /* For now we will only return POLLIN here, since we don't
719 * need anything else ever for inotify. However, let's have
720 * this API to keep our options open should we later on need
725 _public_ int sd_login_monitor_get_timeout(sd_login_monitor *m, uint64_t *timeout_usec) {
732 /* For now we will only return (uint64_t) -1, since we don't
733 * need any timeout. However, let's have this API to keep our
734 * options open should we later on need it. */
735 *timeout_usec = (uint64_t) -1;