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Use the code below to answer the questions:  - Open a second terminal and send it a signal that invalidates the while() loop condition -What command did you use in the second terminal? Here is the code: #include #include #include #include #include volatile sig_atomic_t got_usr1; void sigusr1_handler(int sig) {   (void)sig; // silence unused variable warning   got_usr1 = 1; } int main(void) {   struct sigaction sa;   got_usr1 = 0;   sa.sa_handler = sigusr1_handler;   sa.sa_flags = 0;   sigemptyset(&sa.sa_mask);   if (sigaction(SIGUSR1, &sa, NULL) == -1) {     perror("sigaction");     exit(1);   }   while (!got_usr1) {     printf("PID %d: working hard...\n", getpid());     sleep(1);   }   printf("Done in by SIGUSR1!\n");   return 0; }

Use the code below to answer the questions:  - Open a second terminal and send it a signal that invalidates the while() loop condition -What command did you use in the second terminal? Here is the code: #include #include #include #include #include volatile sig_atomic_t got_usr1; void sigusr1_handler(int sig) {   (void)sig; // silence unused variable warning   got_usr1 = 1; } int main(void) {   struct sigaction sa;   got_usr1 = 0;   sa.sa_handler = sigusr1_handler;   sa.sa_flags = 0;   sigemptyset(&sa.sa_mask);   if (sigaction(SIGUSR1, &sa, NULL) == -1) {     perror("sigaction");     exit(1);   }   while (!got_usr1) {     printf("PID %d: working hard...\n", getpid());     sleep(1);   }   printf("Done in by SIGUSR1!\n");   return 0; }

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Use the code below to answer the questions: 

- Open a second terminal and send it a signal that invalidates the while() loop condition

-What command did you use in the second terminal?

Here is the code:

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

volatile sig_atomic_t got_usr1;

void sigusr1_handler(int sig)
{
  (void)sig; // silence unused variable warning

  got_usr1 = 1;
}

int main(void)
{
  struct sigaction sa;

  got_usr1 = 0;

  sa.sa_handler = sigusr1_handler;
  sa.sa_flags = 0;
  sigemptyset(&sa.sa_mask);

  if (sigaction(SIGUSR1, &sa, NULL) == -1) {
    perror("sigaction");
    exit(1);
  }

  while (!got_usr1) {
    printf("PID %d: working hard...\n", getpid());
    sleep(1);
  }

  printf("Done in by SIGUSR1!\n");

  return 0;
}

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