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 General Public License as published by
10 the Free Software Foundation; either version 2 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 General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
25 #include <sys/inotify.h>
28 #include "cgroup-util.h"
33 static int pid_get_cgroup(pid_t pid, char **root, char **cgroup) {
34 char *cg_process, *cg_init, *p;
43 r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, pid, &cg_process);
47 r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 1, &cg_init);
53 if (endswith(cg_init, "/system"))
54 cg_init[strlen(cg_init)-7] = 0;
55 else if (streq(cg_init, "/"))
58 if (startswith(cg_process, cg_init))
59 p = cg_process + strlen(cg_init);
78 cg_process[p-cg_process] = 0;
86 _public_ int sd_pid_get_session(pid_t pid, char **session) {
93 r = pid_get_cgroup(pid, NULL, &cgroup);
97 if (!startswith(cgroup, "/user/")) {
102 p = strchr(cgroup + 6, '/');
109 if (startswith(p, "shared/") || streq(p, "shared")) {
114 p = strndup(p, strcspn(p, "/"));
124 _public_ int sd_pid_get_unit(pid_t pid, char **unit) {
126 char *cgroup, *p, *at, *b;
132 r = pid_get_cgroup(pid, NULL, &cgroup);
136 if (!startswith(cgroup, "/system/")) {
144 at = memchr(p, '@', k);
145 if (at && at[1] == '.') {
148 /* This is a templated service */
154 j = strcspn(p+k+1, "/");
156 b = malloc(k + j + 1);
159 memcpy(b, p, at - p + 1);
160 memcpy(b + (at - p) + 1, p + k + 1, j);
161 memcpy(b + (at - p) + 1 + j, at + 1, k - (at - p) - 1);
176 _public_ int sd_pid_get_owner_uid(pid_t pid, uid_t *uid) {
178 char *root, *cgroup, *p, *cc;
184 r = pid_get_cgroup(pid, &root, &cgroup);
188 if (!startswith(cgroup, "/user/")) {
194 p = strchr(cgroup + 6, '/');
201 p += strcspn(p, "/");
204 r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, root, cgroup, &cc);
217 if (!S_ISDIR(st.st_mode))
224 _public_ int sd_uid_get_state(uid_t uid, char**state) {
231 if (asprintf(&p, "/run/systemd/users/%lu", (unsigned long) uid) < 0)
234 r = parse_env_file(p, NEWLINE, "STATE", &s, NULL);
239 s = strdup("offline");
255 _public_ int sd_uid_is_on_seat(uid_t uid, int require_active, const char *seat) {
256 char *p, *w, *t, *state, *s = NULL;
259 const char *variable;
264 variable = require_active ? "ACTIVE_UID" : "UIDS";
266 p = strappend("/run/systemd/seats/", seat);
270 r = parse_env_file(p, NEWLINE, variable, &s, NULL);
281 if (asprintf(&t, "%lu", (unsigned long) uid) < 0) {
286 FOREACH_WORD(w, l, s, state) {
287 if (strncmp(t, w, l) == 0) {
301 static int uid_get_array(uid_t uid, const char *variable, char ***array) {
306 if (asprintf(&p, "/run/systemd/users/%lu", (unsigned long) uid) < 0)
309 r = parse_env_file(p, NEWLINE,
332 a = strv_split(s, " ");
349 _public_ int sd_uid_get_sessions(uid_t uid, int require_active, char ***sessions) {
350 return uid_get_array(uid, require_active ? "ACTIVE_SESSIONS" : "SESSIONS", sessions);
353 _public_ int sd_uid_get_seats(uid_t uid, int require_active, char ***seats) {
354 return uid_get_array(uid, require_active ? "ACTIVE_SEATS" : "SEATS", seats);
357 static int file_of_session(const char *session, char **_p) {
364 p = strappend("/run/systemd/sessions/", session);
368 r = sd_pid_get_session(0, &buf);
372 p = strappend("/run/systemd/sessions/", buf);
383 _public_ int sd_session_is_active(const char *session) {
387 r = file_of_session(session, &p);
391 r = parse_env_file(p, NEWLINE, "ACTIVE", &s, NULL);
402 r = parse_boolean(s);
408 _public_ int sd_session_get_uid(const char *session, uid_t *uid) {
415 r = file_of_session(session, &p);
419 r = parse_env_file(p, NEWLINE, "UID", &s, NULL);
430 r = parse_uid(s, uid);
436 static int session_get_string(const char *session, const char *field, char **value) {
443 r = file_of_session(session, &p);
447 r = parse_env_file(p, NEWLINE, field, &s, NULL);
462 _public_ int sd_session_get_seat(const char *session, char **seat) {
463 return session_get_string(session, "SEAT", seat);
466 _public_ int sd_session_get_service(const char *session, char **service) {
467 return session_get_string(session, "SERVICE", service);
470 _public_ int sd_session_get_type(const char *session, char **type) {
471 return session_get_string(session, "TYPE", type);
474 _public_ int sd_session_get_class(const char *session, char **class) {
475 return session_get_string(session, "CLASS", class);
478 _public_ int sd_session_get_display(const char *session, char **display) {
479 return session_get_string(session, "DISPLAY", display);
482 static int file_of_seat(const char *seat, char **_p) {
489 p = strappend("/run/systemd/seats/", seat);
493 r = sd_session_get_seat(NULL, &buf);
497 p = strappend("/run/systemd/seats/", buf);
508 _public_ int sd_seat_get_active(const char *seat, char **session, uid_t *uid) {
509 char *p, *s = NULL, *t = NULL;
512 if (!session && !uid)
515 r = file_of_seat(seat, &p);
519 r = parse_env_file(p, NEWLINE,
542 r = parse_uid(t, uid);
560 _public_ int sd_seat_get_sessions(const char *seat, char ***sessions, uid_t **uids, unsigned *n_uids) {
561 char *p, *s = NULL, *t = NULL, **a = NULL;
566 r = file_of_seat(seat, &p);
570 r = parse_env_file(p, NEWLINE,
572 "ACTIVE_SESSIONS", &t,
583 a = strv_split(s, " ");
597 FOREACH_WORD(w, l, t, state)
611 FOREACH_WORD(w, l, t, state) {
622 r = parse_uid(k, b + i);
650 _public_ int sd_seat_can_multi_session(const char *seat) {
654 r = file_of_seat(seat, &p);
658 r = parse_env_file(p, NEWLINE,
659 "CAN_MULTI_SESSION", &s,
669 r = parse_boolean(s);
677 _public_ int sd_get_seats(char ***seats) {
678 return get_files_in_directory("/run/systemd/seats/", seats);
681 _public_ int sd_get_sessions(char ***sessions) {
682 return get_files_in_directory("/run/systemd/sessions/", sessions);
685 _public_ int sd_get_uids(uid_t **users) {
691 d = opendir("/run/systemd/users/");
696 struct dirent buffer, *de;
700 k = readdir_r(d, &buffer, &de);
709 dirent_ensure_type(d, de);
711 if (!dirent_is_file(de))
714 k = parse_uid(de->d_name, &uid);
719 if ((unsigned) r >= n) {
723 t = realloc(l, sizeof(uid_t) * n);
732 assert((unsigned) r < n);
751 static inline int MONITOR_TO_FD(sd_login_monitor *m) {
752 return (int) (unsigned long) m - 1;
755 static inline sd_login_monitor* FD_TO_MONITOR(int fd) {
756 return (sd_login_monitor*) (unsigned long) (fd + 1);
759 _public_ int sd_login_monitor_new(const char *category, sd_login_monitor **m) {
766 fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC);
770 if (!category || streq(category, "seat")) {
771 k = inotify_add_watch(fd, "/run/systemd/seats/", IN_MOVED_TO|IN_DELETE);
773 close_nointr_nofail(fd);
780 if (!category || streq(category, "session")) {
781 k = inotify_add_watch(fd, "/run/systemd/sessions/", IN_MOVED_TO|IN_DELETE);
783 close_nointr_nofail(fd);
790 if (!category || streq(category, "uid")) {
791 k = inotify_add_watch(fd, "/run/systemd/users/", IN_MOVED_TO|IN_DELETE);
793 close_nointr_nofail(fd);
805 *m = FD_TO_MONITOR(fd);
809 _public_ sd_login_monitor* sd_login_monitor_unref(sd_login_monitor *m) {
815 fd = MONITOR_TO_FD(m);
821 _public_ int sd_login_monitor_flush(sd_login_monitor *m) {
826 return flush_fd(MONITOR_TO_FD(m));
829 _public_ int sd_login_monitor_get_fd(sd_login_monitor *m) {
834 return MONITOR_TO_FD(m);