SD_GET_SEATS(3)                  sd_get_seats                  SD_GET_SEATS(3)

NAME
       sd_get_seats, sd_get_sessions, sd_get_uids, sd_get_machine_names -
       Determine available seats, sessions, logged in users and virtual
       machines/containers

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

       int sd_get_seats(char ***seats);

       int sd_get_sessions(char ***sessions);

       int sd_get_uids(uid_t **users);

       int sd_get_machine_names(char ***machines);

DESCRIPTION
       sd_get_seats() may be used to determine all currently available local
       seats. Returns the number of seat identifiers and if the input pointer
       is non-NULL, a NULL-terminated array of seat identifiers is stored at
       the address. The returned array and all strings it references 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.

       Similarly, sd_get_sessions() may be used to determine all current login
       sessions.

       Similarly, sd_get_uids() may be used to determine all Unix users who
       currently have login sessions.

       Similarly, sd_get_machine_names() may be used to determine all current
       virtual machines and containers on the system.

       Note that the returned lists are not sorted and in an undefined order.

RETURN VALUE
       On success, sd_get_seats(), sd_get_sessions(), sd_get_uids() and
       sd_get_machine_names() return the number of entries in the arrays. On
       failure, these calls return a negative errno-style error code.

   Errors
       Returned errors may indicate the following problems:

       -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.

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

systemd 252                                                    SD_GET_SEATS(3)

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