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 a NULL terminated array of seat
identifiers. 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.
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.