Add SIGHUP handling for reloading configuration
Add signal handling feature for handling the SIGHUP generated by
systemd ExecReload.
Tested log:
- Brfore reload
root@bletchley:~# systemctl status phosphor-pid-control.service
* phosphor-pid-control.service - Phosphor-Pid-Control Margin-based Fan Control Daemon
Loaded: loaded (/lib/systemd/system/phosphor-pid-control.service; enabled; preset: enabled)
Drop-In: /lib/systemd/system/phosphor-pid-control.service.d
`-10-bletchley.conf
Active: active (running) since Fri 2022-09-30 09:12:10 UTC; 1min 11s ago
Main PID: 884 (swampd)
CGroup: /system.slice/phosphor-pid-control.service
`-884 /usr/bin/swampd
Sep 30 09:12:32 bletchley swampd[884]: PID name: fan_tachs
Sep 30 09:12:32 bletchley swampd[884]: inputs: FAN0_TACH_IL, FAN0_TACH_OL, FAN1_TACH_IL, FAN1_TACH_OL, FAN2_TACH_IL, FAN2_TACH_OL, FAN3_TACH_IL, FAN3_TACH_OL,
Sep 30 09:12:32 bletchley swampd[884]: PID name: inlet_Temp
Sep 30 09:12:32 bletchley swampd[884]: inputs: Virtual_Inlet_Temp,
Sep 30 09:12:32 bletchley swampd[884]: PID name: retimer_temp
Sep 30 09:12:32 bletchley swampd[884]: inputs: MB_U19_THERM_LOCAL,
Sep 30 09:12:32 bletchley swampd[884]: PID name: switch_temp
Sep 30 09:12:32 bletchley swampd[884]: inputs: MB_U402_THERM_LOCAL,
Sep 30 09:12:32 bletchley swampd[884]: pushing zone 1
Sep 30 09:12:32 bletchley swampd[884]: PID Zone 1 max SetPoint 37 requested by inlet_Temp FAN0_TACH_IL FAN0_TACH_OL FAN1_TACH_IL FAN1_TACH_OL FAN2_TACH_IL FAN2_TACH_OL FAN3_TACH_IL FAN3_TACH_OL
- After reload called
root@bletchley:~# journalctl -u phosphor-pid-control.service | grep -i reload
Sep 30 09:13:46 bletchley systemd[1]: Reloading Phosphor-Pid-Control Margin-based Fan Control Daemon...
Sep 30 09:13:46 bletchley swampd[884]: reloading configuration
Sep 30 09:13:46 bletchley systemd[1]: Reloaded Phosphor-Pid-Control Margin-based Fan Control Daemon.
root@bletchley:~#
root@bletchley:~# systemctl status phosphor-pid-control
* phosphor-pid-control.service - Phosphor-Pid-Control Margin-based Fan Control Daemon
Loaded: loaded (/lib/systemd/system/phosphor-pid-control.service; enabled; preset: enabled)
Drop-In: /lib/systemd/system/phosphor-pid-control.service.d
`-10-bletchley.conf
Active: active (running) since Fri 2022-09-30 09:12:10 UTC; 2min 35s ago
Process: 1353 ExecReload=/bin/kill -HUP $MAINPID (code=exited, status=0/SUCCESS)
Main PID: 884 (swampd)
CGroup: /system.slice/phosphor-pid-control.service
`-884 /usr/bin/swampd
Sep 30 09:13:56 bletchley swampd[884]: PID name: fan_tachs
Sep 30 09:13:56 bletchley swampd[884]: inputs: FAN0_TACH_IL, FAN0_TACH_OL, FAN1_TACH_IL, FAN1_TACH_OL, FAN2_TACH_IL, FAN2_TACH_OL, FAN3_TACH_IL, FAN3_TACH_OL,
Sep 30 09:13:56 bletchley swampd[884]: PID name: inlet_Temp
Sep 30 09:13:56 bletchley swampd[884]: inputs: Virtual_Inlet_Temp,
Sep 30 09:13:56 bletchley swampd[884]: PID name: retimer_temp
Sep 30 09:13:56 bletchley swampd[884]: inputs: MB_U19_THERM_LOCAL,
Sep 30 09:13:56 bletchley swampd[884]: PID name: switch_temp
Sep 30 09:13:56 bletchley swampd[884]: inputs: MB_U402_THERM_LOCAL,
Sep 30 09:13:56 bletchley swampd[884]: pushing zone 1
Sep 30 09:13:56 bletchley swampd[884]: PID Zone 1 max SetPoint 37 requested by inlet_Temp FAN0_TACH_IL FAN0_TACH_OL FAN1_TACH_IL FAN1_TACH_OL FAN2_TACH_IL FAN2_TACH_OL FAN3_TACH_IL FAN3_TACH_OL
Signed-off-by: Potin Lai <potin.lai@quantatw.com>
Change-Id: Idea1ede908fe4a2da3018cc0624c78ac7e0530eb
diff --git a/phosphor-pid-control.service.in b/phosphor-pid-control.service.in
index a030be1..12b38a9 100644
--- a/phosphor-pid-control.service.in
+++ b/phosphor-pid-control.service.in
@@ -5,6 +5,7 @@
[Service]
Restart=always
ExecStart=@BINDIR@/swampd
+ExecReload=/bin/kill -HUP $MAINPID
RestartSec=5
StartLimitInterval=0
Type=simple