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 Lesser General Public License as published by
13 the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
21 You should have received a copy of the GNU Lesser General Public License
22 along with systemd; If not, see <http://www.gnu.org/licenses/>.
25 #include <sys/types.h>
28 #include "_sd-common.h"
33 * Instead of returning an empty string array or empty uid array, we
36 * Free the data the library returns with libc free(). String arrays
37 * are NULL terminated, and you need to free the array itself, in
38 * addition to the strings contained.
40 * We return error codes as negative errno, kernel-style. On success, we
41 * return 0 or positive.
43 * These functions access data in /proc, /sys/fs/cgroup, and /run. All
44 * of these are virtual file systems; therefore, accesses are
47 * See sd-login(3) for more information.
50 _SD_BEGIN_DECLARATIONS;
52 /* Get session from PID. Note that 'shared' processes of a user are
53 * not attached to a session, but only attached to a user. This will
54 * return an error for system processes and 'shared' processes of a
56 int sd_pid_get_session(pid_t pid, char **session);
58 /* Get UID of the owner of the session of the PID (or in case the
59 * process is a 'shared' user process, the UID of that user is
60 * returned). This will not return the UID of the process, but rather
61 * the UID of the owner of the cgroup that the process is in. This will
62 * return an error for system processes. */
63 int sd_pid_get_owner_uid(pid_t pid, uid_t *uid);
65 /* Get systemd non-slice unit (i.e. service) name from PID, for system
66 * services. This will return an error for non-service processes. */
67 int sd_pid_get_unit(pid_t pid, char **unit);
69 /* Get systemd non-slice unit (i.e. service) name from PID, for user
70 * services. This will return an error for non-user-service
72 int sd_pid_get_user_unit(pid_t pid, char **unit);
74 /* Get slice name from PID. */
75 int sd_pid_get_slice(pid_t pid, char **slice);
77 /* Get user slice name from PID. */
78 int sd_pid_get_user_slice(pid_t pid, char **slice);
80 /* Get machine name from PID, for processes assigned to a VM or
81 * container. This will return an error for non-machine processes. */
82 int sd_pid_get_machine_name(pid_t pid, char **machine);
84 /* Similar to sd_pid_get_session(), but retrieves data about peer of
85 * connected AF_UNIX socket */
86 int sd_peer_get_session(int fd, char **session);
88 /* Similar to sd_pid_get_owner_uid(), but retrieves data about peer of
89 * connected AF_UNIX socket */
90 int sd_peer_get_owner_uid(int fd, uid_t *uid);
92 /* Similar to sd_pid_get_unit(), but retrieves data about peer of
93 * connected AF_UNIX socket */
94 int sd_peer_get_unit(int fd, char **unit);
96 /* Similar to sd_pid_get_user_unit(), but retrieves data about peer of
97 * connected AF_UNIX socket */
98 int sd_peer_get_user_unit(int fd, char **unit);
100 /* Similar to sd_pid_get_slice(), but retrieves data about peer of
101 * connected AF_UNIX socket */
102 int sd_peer_get_slice(int fd, char **slice);
104 /* Similar to sd_pid_get_user_slice(), but retrieves data about peer of
105 * connected AF_UNIX socket */
106 int sd_peer_get_user_slice(int fd, char **slice);
108 /* Similar to sd_pid_get_machine_name(), but retrieves data about peer
109 * of connected AF_UNIX socket */
110 int sd_peer_get_machine_name(int fd, char **machine);
112 /* Get state from UID. Possible states: offline, lingering, online, active, closing */
113 int sd_uid_get_state(uid_t uid, char **state);
115 /* Return primary session of user, if there is any */
116 int sd_uid_get_display(uid_t uid, char **session);
118 /* Return 1 if UID has session on seat. If require_active is true, this will
119 * look for active sessions only. */
120 int sd_uid_is_on_seat(uid_t uid, int require_active, const char *seat);
122 /* Return sessions of user. If require_active is true, this will look for
123 * active sessions only. Returns the number of sessions.
124 * If sessions is NULL, this will just return the number of sessions. */
125 int sd_uid_get_sessions(uid_t uid, int require_active, char ***sessions);
127 /* Return seats of user is on. If require_active is true, this will look for
128 * active seats only. Returns the number of seats.
129 * If seats is NULL, this will just return the number of seats. */
130 int sd_uid_get_seats(uid_t uid, int require_active, char ***seats);
132 /* Return 1 if the session is active. */
133 int sd_session_is_active(const char *session);
135 /* Return 1 if the session is remote. */
136 int sd_session_is_remote(const char *session);
138 /* Get state from session. Possible states: online, active, closing.
139 * This function is a more generic version of sd_session_is_active(). */
140 int sd_session_get_state(const char *session, char **state);
142 /* Determine user ID of session */
143 int sd_session_get_uid(const char *session, uid_t *uid);
145 /* Determine seat of session */
146 int sd_session_get_seat(const char *session, char **seat);
148 /* Determine the (PAM) service name this session was registered by. */
149 int sd_session_get_service(const char *session, char **service);
151 /* Determine the type of this session, i.e. one of "tty", "x11", "wayland", "mir" or "unspecified". */
152 int sd_session_get_type(const char *session, char **type);
154 /* Determine the class of this session, i.e. one of "user", "greeter" or "lock-screen". */
155 int sd_session_get_class(const char *session, char **clazz);
157 /* Determine the desktop brand of this session, i.e. something like "GNOME", "KDE" or "systemd-console". */
158 int sd_session_get_desktop(const char *session, char **desktop);
160 /* Determine the X11 display of this session. */
161 int sd_session_get_display(const char *session, char **display);
163 /* Determine the remote host of this session. */
164 int sd_session_get_remote_host(const char *session, char **remote_host);
166 /* Determine the remote user of this session (if provided by PAM). */
167 int sd_session_get_remote_user(const char *session, char **remote_user);
169 /* Determine the TTY of this session. */
170 int sd_session_get_tty(const char *session, char **display);
172 /* Determine the VT number of this session. */
173 int sd_session_get_vt(const char *session, unsigned *vtnr);
175 /* Return active session and user of seat */
176 int sd_seat_get_active(const char *seat, char **session, uid_t *uid);
178 /* Return sessions and users on seat. Returns number of sessions.
179 * If sessions is NULL, this returns only the number of sessions. */
180 int sd_seat_get_sessions(const char *seat, char ***sessions, uid_t **uid, unsigned *n_uids);
182 /* Return whether the seat is multi-session capable */
183 int sd_seat_can_multi_session(const char *seat);
185 /* Return whether the seat is TTY capable, i.e. suitable for showing console UIs */
186 int sd_seat_can_tty(const char *seat);
188 /* Return whether the seat is graphics capable, i.e. suitable for showing graphical UIs */
189 int sd_seat_can_graphical(const char *seat);
191 /* Return the class of machine */
192 int sd_machine_get_class(const char *machine, char **clazz);
194 /* Return the list if host-side network interface indices of a machine */
195 int sd_machine_get_ifindices(const char *machine, int **ifindices);
197 /* Get all seats, store in *seats. Returns the number of seats. If
198 * seats is NULL, this only returns the number of seats. */
199 int sd_get_seats(char ***seats);
201 /* Get all sessions, store in *sessions. Returns the number of
202 * sessions. If sessions is NULL, this only returns the number of sessions. */
203 int sd_get_sessions(char ***sessions);
205 /* Get all logged in users, store in *users. Returns the number of
206 * users. If users is NULL, this only returns the number of users. */
207 int sd_get_uids(uid_t **users);
209 /* Get all running virtual machines/containers */
210 int sd_get_machine_names(char ***machines);
213 typedef struct sd_login_monitor sd_login_monitor;
215 /* Create a new monitor. Category must be NULL, "seat", "session",
216 * "uid", or "machine" to get monitor events for the specific category
218 int sd_login_monitor_new(const char *category, sd_login_monitor** ret);
220 /* Destroys the passed monitor. Returns NULL. */
221 sd_login_monitor* sd_login_monitor_unref(sd_login_monitor *m);
223 /* Flushes the monitor */
224 int sd_login_monitor_flush(sd_login_monitor *m);
226 /* Get FD from monitor */
227 int sd_login_monitor_get_fd(sd_login_monitor *m);
229 /* Get poll() mask to monitor */
230 int sd_login_monitor_get_events(sd_login_monitor *m);
232 /* Get timeout for poll(), as usec value relative to CLOCK_MONOTONIC's epoch */
233 int sd_login_monitor_get_timeout(sd_login_monitor *m, uint64_t *timeout_usec);
235 _SD_END_DECLARATIONS;