Execute the command via tty

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hi all,

I am new to linux c programming, i need to write a C program logic on how to execute a command through a serial port from one pc to another pc

For example:-

I am having a two PC connected via usb to serial cable. I need to execute the command for eg;-

ls

to list the file in another computer via usb to serial.

But when i tried to write a command it received as a plain string not a command, can any one tell me how do i execute the terminal command from one pc to another pc via /dev/ttyUSB with the help of c program

Thanks
shan

Posted 23-Jan-14 0:27am

shan bala

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OriginalGriff · Answer 1 · 2014-01-23T00:43:00

Solution 1

You will have to execute the command via the C code on the target machine, retrieve the information, and send it back to the original computer via the serial port.
The system[^] function will probably help.

Posted 23-Jan-14 0:43am

OriginalGriff

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[no name] 24-Jan-14 15:58pm

To add to Griff's response (which precisely answers the question) - passing incoming text to the system() function creates a gaping security hole. It would be better to assign the tty device to a getty process. Attempts to interact over the tty port would be first greeted with a prompt for username/password. After logging in, the remote machine could issue normal shell commands like cat and ls.

http://www.tldp.org/HOWTO/html_single/Text-Terminal-HOWTO/#ss15.1

Of course, this becomes an exercise in administration, not programming.