Windows Restart Manager and cygrunsrv services

Windows Restart Manager and cygrunsrv services

[Bill Stewart]

Good day,

Application installers (such as Windows Installer or Inno Setup) can
use the Windows Restart Manager APIs[1] it to determine if a program
or service is running, and automatically stop/restart as appropriate.

This is useful when reinstalling or upgrading a service from an
installer, as the installer itself can stop the service, replace the
binary/binaries, and restart the service automatically.

However it seems that when running a service using cygrunsrv, the
Restart Manager RmGetList API[2] returns RmRebootReasonSessionMismatch
(2) for the lpdwRebootReasons output parameter.

This parameter return value is one of the RM_REBOOT_REASON enumeration
values[3].

The description for the RmRebootReasonSessionMismatch value on MSDN is
as follows: "One or more processes are running in another Terminal
Services session."

I ran into this building an Inno Setup installer. I reproduced on
Windows 10 x64 and Windows Server 2008 R2 x64.

The error description is interesting, because in neither repro case
were there other users logged on using TS sessions. (I'm not sure if
that error description is completely accurate in describing all cases
where that value gets returned, though...)

Unexpected behavior: Restart Manager returns 2
(RmRebootReasonSessionMismatch) in the lpdwRebootReasons output
parameter when calling the RmGetList API to detect a cygrunsrv
service.

Expected behavior: Restart Manager should return 0
(RmRebootReasonNone) in the lpdwRebootReasons output parameter when
calling the RmGetList API to detect a cygrunsrv service.

Further details (regarding Inno Setup and this problem):
https://groups.google.com/d/msg/innosetup/9dAT3wB9RTQ/99Py-ZgLCgAJ

Any ideas why Restart Manager doesn't work for cygrunsrv services?

Thanks!

Bill

____________________

[1] https://docs.microsoft.com/en-us/windows/win32/rstmgr/about-restart-manager

[2] https://docs.microsoft.com/en-us/windows/win32/api/restartmanager/nf-restartmanager-rmgetlist

[3] https://docs.microsoft.com/en-us/windows/win32/api/restartmanager/ne-restartmanager-rm_reboot_reason

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Re: Windows Restart Manager and cygrunsrv services

[Bill Stewart]

On Thu, Jan 23, 2020 at 10:44 AM Bill Stewart wrote:

> However it seems that when running a service using cygrunsrv, the
> Restart Manager RmGetList API[2] returns RmRebootReasonSessionMismatch
> (2) for the lpdwRebootReasons output parameter.
>
> This parameter return value is one of the RM_REBOOT_REASON enumeration
> values[3].
>
> The description for the RmRebootReasonSessionMismatch value on MSDN is
> as follows: "One or more processes are running in another Terminal
> Services session."
>
> I ran into this building an Inno Setup installer. I reproduced on
> Windows 10 x64 and Windows Server 2008 R2 x64.
>
> The error description is interesting, because in neither repro case
> were there other users logged on using TS sessions. (I'm not sure if
> that error description is completely accurate in describing all cases
> where that value gets returned, though...)
>
> Unexpected behavior: Restart Manager returns 2
> (RmRebootReasonSessionMismatch) in the lpdwRebootReasons output
> parameter when calling the RmGetList API to detect a cygrunsrv
> service.
>
> Expected behavior: Restart Manager should return 0
> (RmRebootReasonNone) in the lpdwRebootReasons output parameter when
> calling the RmGetList API to detect a cygrunsrv service.
>
> Further details (regarding Inno Setup and this problem):
> https://groups.google.com/d/msg/innosetup/9dAT3wB9RTQ/99Py-ZgLCgAJ
>
> Any ideas why Restart Manager doesn't work for cygrunsrv services?
>
> Thanks!
>
> Bill
>
> ____________________
>
> [1] https://docs.microsoft.com/en-us/windows/win32/rstmgr/about-restart-manager
>
> [2] https://docs.microsoft.com/en-us/windows/win32/api/restartmanager/nf-restartmanager-rmgetlist
>
> [3] https://docs.microsoft.com/en-us/windows/win32/api/restartmanager/ne-restartmanager-rm_reboot_reason

Question also posted on StackOverflow:

https://stackoverflow.com/questions/59902201/

Any insights appreciated.

Thanks!

Bill

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Re: Windows Restart Manager and cygrunsrv services

[Bill Stewart]

On Mon, Jan 27, 2020 at 9:19 AM Bill Stewart wrote:

> > Any ideas why Restart Manager doesn't work for cygrunsrv services?
> ...
> Question also posted on StackOverflow:
>
> https://stackoverflow.com/questions/59902201/
>
> Any insights appreciated.

According to my investigation and understanding as of this writing,
the behavior appears to be as follows:

1. Restart Manager sees the cygrunsrv.exe executable correctly as a
service and as restartable. This is good.

2. However, any executable spawned by cygrunsrv.exe as a service
(e.g., sshd.exe), is seen as NOT restartable for some reason. This is
not so good, and prevents the service from being restarted
automatically by Restart Manager.

I don't know the explanation for this behavior. It seems unintuitive
and is confusing, at the least.

Just a guess: Perhaps this behavior would be resolved if Cygwin
executables used RegisterApplicationRestart[1] ?

In any case, I have an imperfect workaround, but it would be good if
this workaround wasn't necessary.

Regards,

Bill

__________

[1] https://docs.microsoft.com/en-us/windows/win32/recovery/registering-for-application-restart

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