sd_get_seats(3) — Linux manual page

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | NOTES | SEE ALSO | COLOPHON

SD_GET_SEATS(3)               sd_get_seats               SD_GET_SEATS(3)

NAME         top

       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         top

       #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         top

       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         top

       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         top

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

SEE ALSO         top

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

COLOPHON         top

       This page is part of the systemd (systemd system and service
       manager) project.  Information about the project can be found at
       ⟨http://www.freedesktop.org/wiki/Software/systemd⟩.  If you have
       a bug report for this manual page, see
       ⟨http://www.freedesktop.org/wiki/Software/systemd/#bugreports⟩.
       This page was obtained from the project's upstream Git repository
       ⟨https://github.com/systemd/systemd.git⟩ on 2021-06-20.  (At that
       time, the date of the most recent commit that was found in the
       repository was 2021-06-19.)  If you discover any rendering
       problems in this HTML version of the page, or you believe there
       is a better or more up-to-date source for the page, or you have
       corrections or improvements to the information in this COLOPHON
       (which is not part of the original manual page), send a mail to
       man-pages@man7.org

systemd 249                                              SD_GET_SEATS(3)

Pages that refer to this page: sd-login(3)sd_login_monitor_new(3)systemd.directives(7)systemd.index(7)