Answer / dwarf

on Linux:
man 2 signal
for signum use SIGINT

Answer / rakesh

#include <stdio.h>

#include <signal.h>



void sigproc(void);


main()

{


signal(SIGINT, sigproc);


printf("This program catches ctrl-c(SIGINT) signal for
first time and exit on pressing ctrl-c again\n");

for(;;);
/* infinite loop */

}

void sigproc()

{

signal(SIGINT, sigproc);

printf("you have pressed ctrl-c \n");

(void) signal(SIGINT,SIG_DFL);


}

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