is there a way to tell if a C program is running without a terminal?

MrUmunhum · 05-09-2010, 02:51 PM

Hi group,

I have a C program that can run disconnected ( like most ), is there a programmatical way to tel if the program is running without a terminal? Example:

nohup my-program &

What I want is to modify the program so it can be used as a HUB interface. It does Peer to Peer communication and I want to make it a server function with a command line option. Currently if I disconnect the program, it will loop on the read for stdin, I need to be able to detect that and go into 'HUB' mode.

jiml8 · 05-09-2010, 02:56 PM

Why not just give it a command line option to close stdin, stdout, and stderr?

MrUmunhum · 05-10-2010, 12:09 PM

Quote:

Originally Posted by jiml8

Why not just give it a command line option to close stdin, stdout, and stderr?

If the user is smart enough at the time the program is started, that will work.

I would like to be able to programmatically correct the problem. I could close it if I get a zero length read??

stevexyz · 05-10-2010, 04:09 PM

Check out isatty()

Steve

MrUmunhum · 05-11-2010, 01:21 PM

Quote:

Originally Posted by stevexyz

Check out isatty()

Steve

Prefect, thanks.