1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
7 This file is part of systemd.
9 Copyright 2011 Lennart Poettering
11 systemd is free software; you can redistribute it and/or modify it
12 under the terms of the GNU General Public License as published by
13 the Free Software Foundation; either version 2 of the License, or
14 (at your option) any later version.
16 systemd is distributed in the hope that it will be useful, but
17 WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 General Public License for more details.
21 You should have received a copy of the GNU General Public License
22 along with systemd; If not, see <http://www.gnu.org/licenses/>.
25 #include <sys/types.h>
30 * Instead of returning an empty string array or empty uid array, we
33 * Free the data we return with libc free().
35 * We return error codes as negative errno, kernel-style.
37 * These functions access data in /proc, /sys/fs/cgroup and /run. All
38 * of these are virtual file systems, hence the accesses are
42 /* Get session from PID. Note that 'shared' processes of a user are
43 * not attached to a session, but only attached to a user. This will
44 * return an error for system processes and 'shared' processes of a
46 int sd_pid_get_session(pid_t pid, char **session);
48 /* Get UID of the owner of the session of the PID (or in case the
49 * process is a 'shared' user process the UID of that user is
50 * returned). This will not return the UID of the process, but rather
51 * the UID of the owner of the cgroup the process is in. This will
52 * return an error for system processes. */
53 int sd_pid_get_owner_uid(pid_t pid, uid_t *uid);
55 /* Get state from uid. Possible states: offline, lingering, online, active */
56 int sd_uid_get_state(uid_t uid, char**state);
58 /* Return 1 if uid has session on seat. If require_active is true will
59 * look for active sessions only. */
60 int sd_uid_is_on_seat(uid_t uid, int require_active, const char *seat);
62 /* Return sessions of user. If require_active is true will look
63 * for active sessions only. */
64 int sd_uid_get_sessions(uid_t uid, int require_active, char ***sessions);
66 /* Return seats of user is on. If require_active is true will look for
67 * active seats only. */
68 int sd_uid_get_seats(uid_t uid, int require_active, char ***seats);
70 /* Return 1 if the session is a active */
71 int sd_session_is_active(const char *session);
73 /* Determine user id of session */
74 int sd_session_get_uid(const char *session, uid_t *uid);
76 /* Determine seat of session */
77 int sd_session_get_seat(const char *session, char **seat);
79 /* Return active session and user of seat */
80 int sd_seat_get_active(const char *seat, char **session, uid_t *uid);
82 /* Return sessions and users on seat */
83 int sd_seat_get_sessions(const char *seat, char ***sessions, uid_t **uid, unsigned *n_uids);
86 int sd_get_seats(char ***seats);
88 /* Get all sessions */
89 int sd_get_sessions(char ***sessions);
91 /* Get all logged in users */
92 int sd_get_uids(uid_t **users);
95 typedef struct sd_login_monitor sd_login_monitor;
97 /* Create a new monitor. Category must be NULL, "seat", "session",
98 * "uid" to get monitor events for the specific category (or all). */
99 int sd_login_monitor_new(const char *category, sd_login_monitor** ret);
101 /* Destroys the passed monitor. Returns NULL. */
102 sd_login_monitor* sd_login_monitor_unref(sd_login_monitor *m);
104 /* Flushes the monitor */
105 int sd_login_monitor_flush(sd_login_monitor *m);
107 /* Get FD from monitor */
108 int sd_login_monitor_get_fd(sd_login_monitor *m);