SD_GET_SEATS(3) sd_get_seats SD_GET_SEATS(3)
sd_get_seats, sd_get_sessions, sd_get_uids, sd_get_machine_names - Determine available seats, sessions, logged in users and virtual machines/containers
#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);
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.
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.
These APIs are implemented as a shared library, which can be compiled and linked to with the libsystemd pkg-config(1) file.
systemd(1), sd-login(3), sd_session_get_seat(3)
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 2021-04-01. (At that time, the date of the most recent commit that was found in the repository was 2021-04-01.) 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 firstname.lastname@example.org systemd 248 SD_GET_SEATS(3)
Pages that refer to this page: sd-login(3), sd_login_monitor_new(3), systemd.directives(7), systemd.index(7)