diff --git a/man/sd-login.xml b/man/sd-login.xml
index 62ec6ffefd..9926d2b85c 100644
--- a/man/sd-login.xml
+++ b/man/sd-login.xml
@@ -75,7 +75,26 @@
actively make changes to the seat configuration,
terminate login sessions, or switch session on a seat
you need to utilize the D-Bus API of
- systemd-logind.
+ systemd-logind, instead.
+
+ These functions access data in
+ /proc,
+ /sys/fs/cgroup and
+ /run. All of these are virtual
+ file systems, hence the runtime cost of the accesses
+ is relatively cheap.
+
+ If the functions return string arrays, these are
+ generally NULL terminated and need to be freed by the
+ caller with the libc
+ free3
+ call after use, including the strings referenced
+ therein. Similar, individual strings returned need to
+ be freed, as well.
+
+ As a special exception, instead of an empty
+ string array NULL may be returned, which should be
+ treated equivalent to an empty string array.
See
sd_pid_get_session3,
diff --git a/man/sd_get_seats.xml b/man/sd_get_seats.xml
index bbc396a09b..2ac76500ec 100644
--- a/man/sd_get_seats.xml
+++ b/man/sd_get_seats.xml
@@ -76,11 +76,13 @@
sd_get_seats() may be used
to determine all currently available local
- seats. Returns an array of seat identifiers. The
- returned array and all strings it references need to
- be freed with the libc
+ seats. Returns a NULL terminated array of seat
+ identifiers. The returned array and all strings it
+ references need to be freed with the libc
free3
- call after use.
+ call after use. Note that instead of an empty array
+ NULL may be returned and should be considered
+ equivalent to an empty array.
Similar, sd_get_sessions() may
be used to determine all current login sessions.
@@ -118,7 +120,7 @@
systemd1,
sd-login7,
- sd_session_get_seat3,
+ sd_session_get_seat3
diff --git a/man/sd_login_monitor_new.xml b/man/sd_login_monitor_new.xml
index 2b37f00d30..de484329a9 100644
--- a/man/sd_login_monitor_new.xml
+++ b/man/sd_login_monitor_new.xml
@@ -165,7 +165,7 @@
systemd1,
sd-login7,
- sd_get_seats3,
+ sd_get_seats3
diff --git a/man/sd_seat_get_active.xml b/man/sd_seat_get_active.xml
index e729a653b7..14cda60a56 100644
--- a/man/sd_seat_get_active.xml
+++ b/man/sd_seat_get_active.xml
@@ -101,7 +101,9 @@
determined. The arrays and the strings referenced by
them need to be freed with the libc
free3
- call after use.
+ call after use. Note that instead of an empty array
+ NULL may be returned and should be considered
+ equivalent to an empty array.
sd_seat_can_multi_session()
may be used to determine whether a specific seat is
@@ -143,7 +145,7 @@
systemd1,
sd-login7,
- sd_session_get_seat3,
+ sd_session_get_seat3
diff --git a/man/sd_session_is_active.xml b/man/sd_session_is_active.xml
index 82919f84fb..88b22fd9f8 100644
--- a/man/sd_session_is_active.xml
+++ b/man/sd_session_is_active.xml
@@ -127,7 +127,7 @@
systemd1,
sd-login7,
- sd_pid_get_session3,
+ sd_pid_get_session3
diff --git a/man/sd_uid_get_state.xml b/man/sd_uid_get_state.xml
index a4e9e73087..67776257db 100644
--- a/man/sd_uid_get_state.xml
+++ b/man/sd_uid_get_state.xml
@@ -126,10 +126,13 @@
identifiers in sessions which
needs to be freed by the caller with the libc
free3
- call after use, including all the strings referenced. If
- the string array parameter is passed as NULL the array
- will not be filled in, but the return code still
- indicates the number of current sessions.
+ call after use, including all the strings
+ referenced. If the string array parameter is passed as
+ NULL the array will not be filled in, but the return
+ code still indicates the number of current
+ sessions. Note that instead of an empty array NULL may
+ be returned and should be considered equivalent to an
+ empty array.
Similar, sd_uid_get_seats()
may be used to determine the list of seats on which
@@ -175,7 +178,7 @@
systemd1,
sd-login7,
- sd_pid_get_owner_uid3,
+ sd_pid_get_owner_uid3