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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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This file is part of systemd.
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Copyright 2011 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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#include <sys/types.h>
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* Instead of returning an empty string array or empty uid array, we
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* Free the data we return with libc free().
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* We return error codes as negative errno, kernel-style. 0 or
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* positive on success.
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* These functions access data in /proc, /sys/fs/cgroup and /run. All
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* of these are virtual file systems, hence the accesses are
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/* Get session from PID. Note that 'shared' processes of a user are
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* not attached to a session, but only attached to a user. This will
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* return an error for system processes and 'shared' processes of a
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int sd_pid_get_session(pid_t pid, char **session);
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/* Get UID of the owner of the session of the PID (or in case the
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* process is a 'shared' user process the UID of that user is
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* returned). This will not return the UID of the process, but rather
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* the UID of the owner of the cgroup the process is in. This will
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* return an error for system processes. */
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int sd_pid_get_owner_uid(pid_t pid, uid_t *uid);
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/* Get state from uid. Possible states: offline, lingering, online, active */
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int sd_uid_get_state(uid_t uid, char**state);
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/* Return 1 if uid has session on seat. If require_active is true will
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* look for active sessions only. */
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int sd_uid_is_on_seat(uid_t uid, int require_active, const char *seat);
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/* Return sessions of user. If require_active is true will look for
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* active sessions only. Returns number of sessions as return
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* value. If sessions is NULL will just return number of sessions. */
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int sd_uid_get_sessions(uid_t uid, int require_active, char ***sessions);
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/* Return seats of user is on. If require_active is true will look for
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* active seats only. Returns number of seats. If seats is NULL will
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* just return number of seats.*/
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int sd_uid_get_seats(uid_t uid, int require_active, char ***seats);
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/* Return 1 if the session is a active */
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int sd_session_is_active(const char *session);
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/* Determine user id of session */
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int sd_session_get_uid(const char *session, uid_t *uid);
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/* Determine seat of session */
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int sd_session_get_seat(const char *session, char **seat);
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/* Return active session and user of seat */
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int sd_seat_get_active(const char *seat, char **session, uid_t *uid);
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/* Return sessions and users on seat. Returns number of sessions as
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* return value. If sessions is NULL returns only the number of
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int sd_seat_get_sessions(const char *seat, char ***sessions, uid_t **uid, unsigned *n_uids);
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/* Return whether the seat is multi-session capable */
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int sd_seat_can_multi_session(const char *seat);
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/* Get all seats, store in *seats. Returns the number of seats. If
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* seats is NULL only returns number of seats. */
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int sd_get_seats(char ***seats);
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/* Get all sessions, store in *sessions. Returns the number of
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* sessions. If sessions is NULL only returns number of sessions. */
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int sd_get_sessions(char ***sessions);
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/* Get all logged in users, store in *users. Returns the number of
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* users. If users is NULL only returns the number of users. */
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int sd_get_uids(uid_t **users);
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typedef struct sd_login_monitor sd_login_monitor;
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/* Create a new monitor. Category must be NULL, "seat", "session",
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* "uid" to get monitor events for the specific category (or all). */
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int sd_login_monitor_new(const char *category, sd_login_monitor** ret);
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/* Destroys the passed monitor. Returns NULL. */
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sd_login_monitor* sd_login_monitor_unref(sd_login_monitor *m);
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/* Flushes the monitor */
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int sd_login_monitor_flush(sd_login_monitor *m);
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/* Get FD from monitor */
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int sd_login_monitor_get_fd(sd_login_monitor *m);