handling ctrl D and signals

chimpu · 09-19-2005, 07:46 AM

Can we capture ctrl D if yes how if no why not...

already we know it generated EOF but how to write a handler for it

orgcandman · 09-19-2005, 08:43 AM

If you're trying to capture signals, you use the signal() call.

First, you write a signal handler:

void handler(int signal)
{
printf("Signal trapped: %d\n", signal);
return;
}

Then you call signal, for whatever signal this will be handling:

signal(<signal number>, handler);

As an example:

Code:

#include <stdio.h>
#include <signal.h>

void handler(int sig)
{
    printf("Signal trapped: %d\n", sig);
    exit(0);
    return;
}

int main()
{
    signal(1, handler);
    signal(2, handler);
    signal(3, handler);
    signal(6, handler);
    signal(9, handler);
    signal(13, handler);
    signal(15, handler);
    signal(19, handler);

    while (1);
}

If you run that, and press CTRL+C it will show you what signal is being sent.
See bits/signum.h for a list of signals.