sd_session_is_active, sd_session_get_uid, sd_session_get_seat, sd_session_get_service, sd_session_get_type, sd_session_get_class, sd_session_get_display — Determine state of a specific session
#include <systemd/sd-login.h>
int sd_session_is_active( | const char* session) ; |
int sd_session_get_uid( | const char* session, |
uid_t* uid) ; |
int sd_session_get_seat( | const char* session, |
char** seat) ; |
int sd_session_get_service( | const char* session, |
char** service) ; |
int sd_session_get_type( | const char* session, |
char** type) ; |
int sd_session_get_class( | const char* session, |
char** class) ; |
int sd_session_get_display( | const char* session, |
char** display) ; |
sd_session_is_active()
may
be used to determine whether the session identified by
the specified session identifier is currently active
(i.e. currently in the foreground and available for
user input) or not.
sd_session_get_uid()
may be
used to determine the user identifier of the Unix user the session
identified by the specified session identifier belongs
to.
sd_session_get_seat()
may
be used to determine the seat identifier of the seat
the session identified by the specified session
identifier belongs to. Note that not all sessions are
attached to a seat, this call will fail for them. The
returned string needs to be freed with the libc
free(3)
call after use.
sd_session_get_service()
may be used to determine the name of the service (as
passed during PAM session setup) that registered the
session identified by the specified session
identifier. The returned string needs to be freed with
the libc
free(3)
call after use.
sd_session_get_type()
may
be used to determine the type of the session
identified by the specified session identifier. The
returned string is one of x11
,
tty
or
unspecified
and needs to be freed
with the libc
free(3)
call after use.
sd_session_get_class()
may
be used to determine the class of the session
identified by the specified session identifier. The
returned string is one of user
,
greeter
or
lock-screen
and needs to be freed
with the libc
free(3)
call after use.
sd_session_get_display()
may be used to determine the X11 display of the
session identified by the specified session
identifier. The returned string is one of needs to be
freed with the libc
free(3)
call after use.
If the session
parameter of
any of these functions is passed as NULL the operation
is executed for the session the calling process is a
member of, if there is any.
If the test succeeds
sd_session_is_active()
returns a
positive integer, if it fails 0. On success
sd_session_get_uid()
,
sd_session_get_service()
and
sd_session_get_seat()
return 0 or
a positive integer. On failure, these calls return a
negative errno-style error code.