Dear All,

I am writing some application in C, which will access a serial port device (RS232). My application is working good. But if any other application is already opened the port, I couldn't able to identify that.


In windows VB program, while accessing comport through mscomm control, i am receiving an error as "Port Already Opened". But in Linux environment, through C program how can i get that?

I am accessing comport 1 as follows
fd = open("/dev/ttyS0", O_RDWR | O_NOCTTY | O_SYNC);

Thanks in advance for your valuable suggestions.

Regards,
Rajmohan.

Have u tried identifying whether the port is already open or not by using the various return values of open() system call ?

Dear Anisha, Thanks. I tried this. But i got positive values which is file descriptor. I'm not getting error for open() system call.

Rajmohan

See the following links, may be they can help u someway !

http://stackoverflow.com/questions/1694144?tab=oldest

http://www.linux-noob.com/forums/ind...o-open-a-port/