tree 38a49c0d69e725db008f4d15dc9f0a1c31cc0698
parent f2efcbbd31ebbf9edfcfae16fffe88496d23b53d
author Potin Lai <potin.lai@quantatw.com> 1664528974 +0800
committer PL <potin.lai@quantatw.com> 1665552176 +0000

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