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systemd
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sd-login.h
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/* SPDX-License-Identifier: LGPL-2.1+ */ #ifndef foosdloginhfoo #define foosdloginhfoo /*** systemd is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. systemd is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with systemd; If not, see <http://www.gnu.org/licenses/>. ***/ #include <inttypes.h> #include <sys/types.h> #include "_sd-common.h" /* * A few points: * * Instead of returning an empty string array or empty uid array, we * may return NULL. * * Free the data the library returns with libc free(). String arrays * are NULL terminated, and you need to free the array itself, in * addition to the strings contained. * * We return error codes as negative errno, kernel-style. On success, we * return 0 or positive. * * These functions access data in /proc, /sys/fs/cgroup, and /run. All * of these are virtual file systems; therefore, accesses are * relatively cheap. * * See sd-login(3) for more information. */ _SD_BEGIN_DECLARATIONS; /* Get session from PID. Note that 'shared' processes of a user are * not attached to a session, but only attached to a user. This will * return an error for system processes and 'shared' processes of a * user. */ int sd_pid_get_session(pid_t pid, char **session); /* Get UID of the owner of the session of the PID (or in case the * process is a 'shared' user process, the UID of that user is * returned). This will not return the UID of the process, but rather * the UID of the owner of the cgroup that the process is in. This will * return an error for system processes. */ int sd_pid_get_owner_uid(pid_t pid, uid_t *uid); /* Get systemd non-slice unit (i.e. service) name from PID, for system * services. This will return an error for non-service processes. */ int sd_pid_get_unit(pid_t pid, char **unit); /* Get systemd non-slice unit (i.e. service) name from PID, for user * services. This will return an error for non-user-service * processes. */ int sd_pid_get_user_unit(pid_t pid, char **unit); /* Get slice name from PID. */ int sd_pid_get_slice(pid_t pid, char **slice); /* Get user slice name from PID. */ int sd_pid_get_user_slice(pid_t pid, char **slice); /* Get machine name from PID, for processes assigned to a VM or * container. This will return an error for non-machine processes. */ int sd_pid_get_machine_name(pid_t pid, char **machine); /* Get the control group from a PID, relative to the root of the * hierarchy. */ int sd_pid_get_cgroup(pid_t pid, char **cgroup); /* Similar to sd_pid_get_session(), but retrieves data about the peer * of a connected AF_UNIX socket */ int sd_peer_get_session(int fd, char **session); /* Similar to sd_pid_get_owner_uid(), but retrieves data about the peer of * a connected AF_UNIX socket */ int sd_peer_get_owner_uid(int fd, uid_t *uid); /* Similar to sd_pid_get_unit(), but retrieves data about the peer of * a connected AF_UNIX socket */ int sd_peer_get_unit(int fd, char **unit); /* Similar to sd_pid_get_user_unit(), but retrieves data about the peer of * a connected AF_UNIX socket */ int sd_peer_get_user_unit(int fd, char **unit); /* Similar to sd_pid_get_slice(), but retrieves data about the peer of * a connected AF_UNIX socket */ int sd_peer_get_slice(int fd, char **slice); /* Similar to sd_pid_get_user_slice(), but retrieves data about the peer of * a connected AF_UNIX socket */ int sd_peer_get_user_slice(int fd, char **slice); /* Similar to sd_pid_get_machine_name(), but retrieves data about the * peer of a connected AF_UNIX socket */ int sd_peer_get_machine_name(int fd, char **machine); /* Similar to sd_pid_get_cgroup(), but retrieves data about the peer * of a connected AF_UNIX socket. */ int sd_peer_get_cgroup(pid_t pid, char **cgroup); /* Get state from UID. Possible states: offline, lingering, online, active, closing */ int sd_uid_get_state(uid_t uid, char **state); /* Return primary session of user, if there is any */ int sd_uid_get_display(uid_t uid, char **session); /* Return 1 if UID has session on seat. If require_active is true, this will * look for active sessions only. */ int sd_uid_is_on_seat(uid_t uid, int require_active, const char *seat); /* Return sessions of user. If require_active is true, this will look for * active sessions only. Returns the number of sessions. * If sessions is NULL, this will just return the number of sessions. */ int sd_uid_get_sessions(uid_t uid, int require_active, char ***sessions); /* Return seats of user is on. If require_active is true, this will look for * active seats only. Returns the number of seats. * If seats is NULL, this will just return the number of seats. */ int sd_uid_get_seats(uid_t uid, int require_active, char ***seats); /* Return 1 if the session is active. */ int sd_session_is_active(const char *session); /* Return 1 if the session is remote. */ int sd_session_is_remote(const char *session); /* Get state from session. Possible states: online, active, closing. * This function is a more generic version of sd_session_is_active(). */ int sd_session_get_state(const char *session, char **state); /* Determine user ID of session */ int sd_session_get_uid(const char *session, uid_t *uid); /* Determine seat of session */ int sd_session_get_seat(const char *session, char **seat); /* Determine the (PAM) service name this session was registered by. */ int sd_session_get_service(const char *session, char **service); /* Determine the type of this session, i.e. one of "tty", "x11", "wayland", "mir" or "unspecified". */ int sd_session_get_type(const char *session, char **type); /* Determine the class of this session, i.e. one of "user", "greeter" or "lock-screen". */ int sd_session_get_class(const char *session, char **clazz); /* Determine the desktop brand of this session, i.e. something like "GNOME", "KDE" or "systemd-console". */ int sd_session_get_desktop(const char *session, char **desktop); /* Determine the X11 display of this session. */ int sd_session_get_display(const char *session, char **display); /* Determine the remote host of this session. */ int sd_session_get_remote_host(const char *session, char **remote_host); /* Determine the remote user of this session (if provided by PAM). */ int sd_session_get_remote_user(const char *session, char **remote_user); /* Determine the TTY of this session. */ int sd_session_get_tty(const char *session, char **display); /* Determine the VT number of this session. */ int sd_session_get_vt(const char *session, unsigned *vtnr); /* Return active session and user of seat */ int sd_seat_get_active(const char *seat, char **session, uid_t *uid); /* Return sessions and users on seat. Returns number of sessions. * If sessions is NULL, this returns only the number of sessions. */ int sd_seat_get_sessions(const char *seat, char ***sessions, uid_t **uid, unsigned *n_uids); /* Return whether the seat is multi-session capable */ int sd_seat_can_multi_session(const char *seat); /* Return whether the seat is TTY capable, i.e. suitable for showing console UIs */ int sd_seat_can_tty(const char *seat); /* Return whether the seat is graphics capable, i.e. suitable for showing graphical UIs */ int sd_seat_can_graphical(const char *seat); /* Return the class of machine */ int sd_machine_get_class(const char *machine, char **clazz); /* Return the list if host-side network interface indices of a machine */ int sd_machine_get_ifindices(const char *machine, int **ifindices); /* Get all seats, store in *seats. Returns the number of seats. If * seats is NULL, this only returns the number of seats. */ int sd_get_seats(char ***seats); /* Get all sessions, store in *sessions. Returns the number of * sessions. If sessions is NULL, this only returns the number of sessions. */ int sd_get_sessions(char ***sessions); /* Get all logged in users, store in *users. Returns the number of * users. If users is NULL, this only returns the number of users. */ int sd_get_uids(uid_t **users); /* Get all running virtual machines/containers */ int sd_get_machine_names(char ***machines); /* Monitor object */ typedef struct sd_login_monitor sd_login_monitor; /* Create a new monitor. Category must be NULL, "seat", "session", * "uid", or "machine" to get monitor events for the specific category * (or all). */ int sd_login_monitor_new(const char *category, sd_login_monitor** ret); /* Destroys the passed monitor. Returns NULL. */ sd_login_monitor* sd_login_monitor_unref(sd_login_monitor *m); /* Flushes the monitor */ int sd_login_monitor_flush(sd_login_monitor *m); /* Get FD from monitor */ int sd_login_monitor_get_fd(sd_login_monitor *m); /* Get poll() mask to monitor */ int sd_login_monitor_get_events(sd_login_monitor *m); /* Get timeout for poll(), as usec value relative to CLOCK_MONOTONIC's epoch */ int sd_login_monitor_get_timeout(sd_login_monitor *m, uint64_t *timeout_usec); _SD_DEFINE_POINTER_CLEANUP_FUNC(sd_login_monitor, sd_login_monitor_unref); _SD_END_DECLARATIONS; #endif