NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | 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         top

       Returned errors may indicate the following problems:

       -ENOMEM
           Memory allocation failed.

NOTES         top

       The sd_get_seats(), sd_get_sessions(), sd_get_uids() and
       sd_get_machine_names() interfaces are available 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 2017-09-15.  If you dis‐
       cover 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 234                                                  SD_GET_SEATS(3)

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