SD_SEAT_GET_ACTIVE(3)         sd_seat_get_active         SD_SEAT_GET_ACTIVE(3)

NAME
       sd_seat_get_active, sd_seat_get_sessions, sd_seat_can_tty,
       sd_seat_can_graphical - Determine state of a specific seat

SYNOPSIS
       #include <systemd/sd-login.h>

       int sd_seat_get_active(const char *seat, char **session, uid_t *uid);

       int sd_seat_get_sessions(const char *seat, char ***ret_sessions,
                                uid_t **ret_uids, unsigned int *ret_n_uids);

       int sd_seat_can_tty(const char *seat);

       int sd_seat_can_graphical(const char *seat);

DESCRIPTION
       sd_seat_get_active() may be used to determine which session is
       currently active on a seat, if there is any. Returns the session
       identifier and the user identifier of the Unix user the session is
       belonging to. Either the session or the user identifier parameter can
       be passed NULL, in case only one of the parameters shall be queried.
       The returned string needs to be freed with the libc free(3) call after
       use.

       sd_seat_get_sessions() may be used to determine all sessions on the
       specified seat. Returns two arrays, one (NULL terminated) with the
       session identifiers of the sessions and one with the user identifiers
       of the Unix users the sessions belong to. An additional parameter may
       be used to return the number of entries in the latter array. This value
       is the same as the return value if the return value is nonnegative. The
       output parameters may be passed as NULL in case these output values are
       not needed. The arrays and the strings referenced by them need to be
       freed with the libc free(3) call after use. Note that instead of an
       empty array NULL may be returned and should be considered equivalent to
       an empty array.

       sd_seat_can_tty() may be used to determine whether a specific seat
       provides TTY functionality, i.e. is useful as a text console.

       sd_seat_can_graphical() may be used to determine whether a specific
       seat provides graphics functionality, i.e. is useful as a graphics
       display.

       If the seat parameter of any of these functions is passed as NULL, the
       operation is executed for the seat of the session of the calling
       process, if there is any.

RETURN VALUE
       On success, sd_seat_get_active() returns 0 or a positive integer. On
       success, sd_seat_get_sessions() returns the number of entries in the
       session identifier array. If the test succeeds, sd_seat_can_tty() and
       sd_seat_can_graphical() return a positive integer, if it fails 0. On
       failure, these calls return a negative errno-style error code.

   Errors
       Returned errors may indicate the following problems:

       -ENODATA
           The given field is not specified for the described seat.

       -ENXIO
           The specified seat is unknown.

       -EINVAL
           An input parameter was invalid (out of range, or NULL, where that
           is not accepted).

       -ENOMEM
           Memory allocation failed.

NOTES
       These APIs are implemented as a shared library, which can be compiled
       and linked to with the libsystemd pkg-config(1) file.

HISTORY
       In the past, sd_seat_can_multi_session() was used to check whether the
       seat supports multiple sessions. All seats support that now, so that
       function has been deprecated and always returns true.

SEE ALSO
       systemd(1), sd-login(3), sd_session_get_seat(3)

systemd 252                                              SD_SEAT_GET_ACTIVE(3)

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