/*-------------------------------------------------------------------*/
/* testsignalfork.c                                                  */
/* Ignoring signals in the parent (but not the child) process.       */
/*-------------------------------------------------------------------*/

#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <unistd.h>
#include <wait.h>

int main(int argc, char *argv[])
{
   int iPid;
   int i = 0;
   
   signal(SIGINT, SIG_IGN);
   
   fflush(NULL);
   iPid = fork();
   if (iPid == -1) {perror(argv[0]); return 1; }

   if (iPid == 0)
   {
      signal(SIGINT, SIG_DFL);

      while (1)
      {
         printf("Child process:  %d\n", i);
         i++;
      }
      exit(1);  /* Should never reach this line. */
   }

   while (1)
   {
      printf("Parent process:  %d\n", i);
      i++;
   }

   
   wait(NULL);

   return 0;
}

/* Sample execution:

$ gcc -Wall -ansi -pedantic -o testsignalfork testsignalfork.c
$ testsignalfork
Parent process:  0
Parent process:  1
...
Child process:  0
Child process:  1
...
^C                      <- Kills child process, but not parent process
Parent process:  12345
Parent process:  12346
...

*/