'\" t
.\"     Title: sd_get_seats
.\"    Author: Lennart Poettering <lennart@poettering.net>
.\" Generator: DocBook XSL Stylesheets v1.76.1 <http://docbook.sf.net/>
.\"      Date: 10/07/2013
.\"    Manual: sd_get_seats
.\"    Source: systemd
.\"  Language: English
.\"
.TH "SD_GET_SEATS" "3" "10/07/2013" "systemd" "sd_get_seats"
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.SH "NAME"
sd_get_seats, sd_get_sessions, sd_get_uids \- Determine available seats, sessions and logged in users
.SH "SYNOPSIS"
.sp
.ft B
.nf
#include <systemd/sd\-login\&.h>
.fi
.ft
.HP \w'int\ sd_get_seats('u
.BI "int sd_get_seats(char***\ " "seats" ");"
.HP \w'int\ sd_get_sessions('u
.BI "int sd_get_sessions(char***\ " "sessions" ");"
.HP \w'int\ sd_get_uids('u
.BI "int sd_get_uids(char***\ " "sessions" ");"
.SH "DESCRIPTION"
.PP
\fBsd_get_seats()\fR
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
\fBfree\fR(3)
call after use\&. Note that instead of an empty array NULL may be returned and should be considered equivalent to an empty array\&.
.PP
Similar,
\fBsd_get_sessions()\fR
may be used to determine all current login sessions\&.
.PP
Similar,
\fBsd_get_uids()\fR
may be used to determine all Unix users who currently have login sessions\&.
.SH "RETURN VALUE"
.PP
On success
\fBsd_get_seats()\fR,
\fBsd_get_sessions()\fR
and
\fBsd_get_uids()\fR
return the number of entries in the arrays\&. On failure, these calls return a negative errno\-style error code\&.
.SH "NOTES"
.PP
The
\fBsd_get_seats()\fR,
\fBsd_get_sessions()\fR
and
\fBsd_get_uids()\fR
interfaces are available as shared library, which can be compiled and linked to with the
libsystemd\-login
\fBpkg-config\fR(1)
file\&.
.SH "SEE ALSO"
.PP

\fBsystemd\fR(1),
\fBsd-login\fR(7),
\fBsd_session_get_seat\fR(3)
.SH "AUTHOR"
.PP
\fBLennart Poettering\fR <\&lennart@poettering\&.net\&>
.RS 4
Developer
.RE