/dev/ttyS and locks

/dev/ttyS and locks

[Nicolai Kuntze]

Hi,

is it possible to do some kind of  dynamic locking of the serial port? I have about 10 users and all of them need from time to time access to a modem attached to the serial port. I am thinking of a little DOS programm to turn the lock on and of so everyone has the abbility to use the port.

Yours,

Nicolai


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Re: /dev/ttyS and locks

[Claudia Neumann]

Hi Nicolai!

Am Samstag, 8. Mai 2004 09:48 schrieb Nicolai Kuntze:
> is it possible to do some kind of  dynamic locking of the serial port? I
> have about 10 users and all of them need from time to time access to a
> modem attached to the serial port. I am thinking of a little DOS programm
> to turn the lock on and of so everyone has the abbility to use the port.

I solved a similar problem by installing a conf-File for each user. The user 
has to load DOSemu with "xdosemu -f $HOME/your_conf_file". In this conf-Files 
I redirect the lock-Files to different directories. This is possible because 
my DOS program reads from a card reading device at /dev/ttyS0 and uses it 
only for a short time. Locking for me is not really necessary. 

With this configuration I can read from the card reading device from several 
DOSemu sessions. But it can take up to 3 efforts until the program has 
retrieved the data. 

Hope that helps

Claudia