Hi Corinna,

Thank you for the help.

I tried following the instructions on 
https://cygwin.com/cygwin-ug-net/using-cygserver.html#start-cygserver

There was a line, "Before you run Cygserver for the first time, you 
should run the /usr/bin/cygserver-config script once."

I googled for some instructions and it said to use "cygserver-config" in 
the Cygwin terminal.

I did it and the following is the reply from the terminal.

*Without admin privileges*

"$ cygserver-config
Generating /etc/cygserver.conf file
chown: changing ownership of '/etc/cygserver.conf': Permission denied


Warning: The following function requires administrator privileges!

Do you want to install cygserver as service?
(Say "no" if it's already installed as service) (yes/no) yes
/usr/bin/cygserver-config: line 181: cygrunsrv: command not found

Installation of cygserver as service failed.  Please check the
error messages you got.  They might give a clue why it failed.

A good start is either you don't have administrator privileges
or a missing cygrunsrv binary.  Please check for both."


*With admin privileges*
"$ cygserver-config
Overwrite existing /etc/cygserver.conf file? (yes/no) yes
Generating /etc/cygserver.conf file


Warning: The following function requires administrator privileges!

Do you want to install cygserver as service?
(Say "no" if it's already installed as service) (yes/no) yes
/usr/bin/cygserver-config: line 181: cygrunsrv: command not found

Installation of cygserver as service failed.  Please check the
error messages you got.  They might give a clue why it failed.

A good start is either you don't have administrator privileges
or a missing cygrunsrv binary.  Please check for both."


May I ask what I should do next?


Thank you very much.


Kind Regards,

YEO Kai Wei

P.S. How do you convert to using POSIX message queues in Cygwin?


On 28/2/2023 6:29 pm, Corinna Vinschen wrote:
> On Feb 28 18:13, Yeo Kai Wei via Cygwin wrote:
>> Hi Cygwin,
>>
>> May I ask if there will be an implementation of msgget() on Cygwin for
>> Windows?
> There is, for ages.  However, you have to run cygserver for that
> to work:
>
>    https://cygwin.com/cygwin-ug-net/using-cygserver.html
>
> If cygserver isn't running, the XSI IPC functions return ENOSYS.
>
> Alternatively, convert your tool to using POSIX message queues, those
> are using a file backed solution and don't require cygserver.
>
>
> Corinna