Signals

[it01y2]

I am trying to work out how to detect a ctrl c, if the ctrl c is detected in the child the child of the parent will exit and return to the parent currently running a command line. I have tried to use signal handlers, but need some help.

Much help will be much appreciated.

--
Thanks
it01y2

[Salem]

signal(2): ANSI C signal handling - Linux man page

signal(7): available signals - Linux man page

ctrl-c is SIGINT

[kiruthika]

Trace the SIGINT signal by writing the signal handler.
Example
--------

void sig_handler()
{
 --- /*handling SIGINT*/
 ---
}
int main()
{
 signal(SIGINT,sig_handler);/*Call the function sig_handler whenever ctrl-c get pressed.*/
.
.
.
}

[thillai_selvan]

The signal function is used to catch the signal. And by that u can change the behaviour of the signal by your own functions. When you are giving ctrl+c at that time interrupt signal will be generated. That is SIGINT. when this signal is caught you may wish to do some actions. Have those actions in a function and you can use like follows

signal (SIGINT, signal_handler_function);

Note: include the header file signal.h in your code.
Thanks!

[karthigayan]

signal function is for just handle the signal.If you want to play with signals use sigaction system call.

man sigaction

It has some special flags to use.