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other versions
- jessie 215-17+deb8u7
- jessie-backports 230-7~bpo8+2
- stretch 232-25+deb9u6
- testing 239-15
- stretch-backports 239-12~bpo9+1
- unstable 240-1
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/containersSYNOPSIS¶
#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 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.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: -EINVALAn input parameter was invalid (out of range, or NULL,
where that is not accepted).
-ENOMEM
Memory allocation failed.
NOTES¶
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¶
systemd(1), sd-login(3), sd_session_get_seat(3)systemd 230 |