[systemd-devel] hint to know the state of the service using function

[Rajmohan. R]

Hi,
Below is the change related to logging of the units (service) while changing 
the state [in]active_[exit/enter].

I did not get any hint from source code, to know the state change using 
function, without querying the target system through CLI.
Could someone from the forum help in providing a hint on how to get the state 
of the services without querying through CLI.

Instead of below changes, is there any alternative modification i can do to 
know the state of the service.

diff --git a/src/core/unit.c b/src/core/unit.c
index c406bb7ab2..e6ad9b3fbf 100644
--- a/src/core/unit.c
+++ b/src/core/unit.c
@@ -2497,15 +2497,31 @@ void unit_notify(Unit *u, UnitActiveState os, 
UnitActiveState ns, UnitNotifyFlag
         if (!MANAGER_IS_RELOADING(m)) {
                 dual_timestamp_get(&u->state_change_timestamp);

-                if (UNIT_IS_INACTIVE_OR_FAILED(os) && 
!UNIT_IS_INACTIVE_OR_FAILED(ns))
+                if (UNIT_IS_INACTIVE_OR_FAILED(os) && 
!UNIT_IS_INACTIVE_OR_FAILED(ns)) {
                         u->inactive_exit_timestamp = u->state_change_timestamp;
-                else if (!UNIT_IS_INACTIVE_OR_FAILED(os) && 
UNIT_IS_INACTIVE_OR_FAILED(ns))
+                        log_warning("sd: u=%s, inactive_exit="USEC_FMT,
+                                    u->id, 
u->inactive_exit_timestamp.monotonic);
+                }
+                else if (!UNIT_IS_INACTIVE_OR_FAILED(os) && 
UNIT_IS_INACTIVE_OR_FAILED(ns)) {
                         u->inactive_enter_timestamp = 
u->state_change_timestamp;
+                        log_warning("sd: u=%s, inactive_enter="USEC_FMT,
+                                    u->id, 
u->inactive_enter_timestamp.monotonic);
+                }

-                if (!UNIT_IS_ACTIVE_OR_RELOADING(os) && 
UNIT_IS_ACTIVE_OR_RELOADING(ns))
+                if (!UNIT_IS_ACTIVE_OR_RELOADING(os) && 
UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
                         u->active_enter_timestamp = u->state_change_timestamp;
-                else if (UNIT_IS_ACTIVE_OR_RELOADING(os) && 
!UNIT_IS_ACTIVE_OR_RELOADING(ns))
+                        log_warning("sd: u=%s, active_enter="USEC_FMT,
+                                    u->id, 
u->active_enter_timestamp.monotonic);
+                        if (unit_has_name(u, SPECIAL_BASIC_TARGET)) {
+                                log_warning("sd: status changed: STARTING, 
t="USEC_FMT,
+                                            
u->active_enter_timestamp.monotonic);
+                        }
+                }
+                else if (UNIT_IS_ACTIVE_OR_RELOADING(os) && 
!UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
                         u->active_exit_timestamp = u->state_change_timestamp;
+                        log_warning("sd: u=%s, active_exit="USEC_FMT,
+                                    u->id, u->active_exit_timestamp.monotonic);
+                }
         }

         /* Keep track of failed units */

Thank you for your help
rajmohan
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