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>
34 * Instead of returning an empty string array or empty uid array, we
37 * Free the data we return with libc free().
39 * We return error codes as negative errno, kernel-style. 0 or
40 * positive on success.
42 * These functions access data in /proc, /sys/fs/cgroup and /run. All
43 * of these are virtual file systems, hence the accesses are
47 /* Get session from PID. Note that 'shared' processes of a user are
48 * not attached to a session, but only attached to a user. This will
49 * return an error for system processes and 'shared' processes of a
51 int sd_pid_get_session(pid_t pid, char **session);
53 /* Get UID of the owner of the session of the PID (or in case the
54 * process is a 'shared' user process the UID of that user is
55 * returned). This will not return the UID of the process, but rather
56 * the UID of the owner of the cgroup the process is in. This will
57 * return an error for system processes. */
58 int sd_pid_get_owner_uid(pid_t pid, uid_t *uid);
60 /* Get systemd unit (i.e. service) name from PID. This will return an
61 * error for non-service processes. */
62 int sd_pid_get_unit(pid_t, char **unit);
64 /* Get state from uid. Possible states: offline, lingering, online, active */
65 int sd_uid_get_state(uid_t uid, char**state);
67 /* Return 1 if uid has session on seat. If require_active is true will
68 * look for active sessions only. */
69 int sd_uid_is_on_seat(uid_t uid, int require_active, const char *seat);
71 /* Return sessions of user. If require_active is true will look for
72 * active sessions only. Returns number of sessions as return
73 * value. If sessions is NULL will just return number of sessions. */
74 int sd_uid_get_sessions(uid_t uid, int require_active, char ***sessions);
76 /* Return seats of user is on. If require_active is true will look for
77 * active seats only. Returns number of seats. If seats is NULL will
78 * just return number of seats.*/
79 int sd_uid_get_seats(uid_t uid, int require_active, char ***seats);
81 /* Return 1 if the session is a active */
82 int sd_session_is_active(const char *session);
84 /* Determine user id of session */
85 int sd_session_get_uid(const char *session, uid_t *uid);
87 /* Determine seat of session */
88 int sd_session_get_seat(const char *session, char **seat);
90 /* Determine the (PAM) service name this session was registered by. */
91 int sd_session_get_service(const char *session, char **service);
93 /* Determine the type of this session, i.e. one of "tty", "x11" or "unspecified". */
94 int sd_session_get_type(const char *session, char **type);
96 /* Determine the class of this session, i.e. one of "user", "greeter" or "lock-screen". */
97 int sd_session_get_class(const char *session, char **clazz);
99 /* Determine the X11 display of this session. */
100 int sd_session_get_display(const char *session, char **display);
102 /* Return active session and user of seat */
103 int sd_seat_get_active(const char *seat, char **session, uid_t *uid);
105 /* Return sessions and users on seat. Returns number of sessions as
106 * return value. If sessions is NULL returns only the number of
108 int sd_seat_get_sessions(const char *seat, char ***sessions, uid_t **uid, unsigned *n_uids);
110 /* Return whether the seat is multi-session capable */
111 int sd_seat_can_multi_session(const char *seat);
113 /* Get all seats, store in *seats. Returns the number of seats. If
114 * seats is NULL only returns number of seats. */
115 int sd_get_seats(char ***seats);
117 /* Get all sessions, store in *sessions. Returns the number of
118 * sessions. If sessions is NULL only returns number of sessions. */
119 int sd_get_sessions(char ***sessions);
121 /* Get all logged in users, store in *users. Returns the number of
122 * users. If users is NULL only returns the number of users. */
123 int sd_get_uids(uid_t **users);
126 typedef struct sd_login_monitor sd_login_monitor;
128 /* Create a new monitor. Category must be NULL, "seat", "session",
129 * "uid" to get monitor events for the specific category (or all). */
130 int sd_login_monitor_new(const char *category, sd_login_monitor** ret);
132 /* Destroys the passed monitor. Returns NULL. */
133 sd_login_monitor* sd_login_monitor_unref(sd_login_monitor *m);
135 /* Flushes the monitor */
136 int sd_login_monitor_flush(sd_login_monitor *m);
138 /* Get FD from monitor */
139 int sd_login_monitor_get_fd(sd_login_monitor *m);