Directions use only the signal mechanism system calls dont u

 Directions: use only the signal mechanism system calls don’t use ( wait() or pipe() )in this problem. You can still read/write from/to a file. You must use ( kill() and pause() ) system calls.    rewrite code below to do kill and pause system calls  #include <fcntl.h> #include <unistd.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <sys/wait.h>  // Function ptototypes int readX(); void writeX(int);  int main() {         int pid;                        // pid: used to keep track of the child process         int x = 19530;          // x: our value as integer         int i;                          // iterator               // Write x to file         writeX(x);          // output inital value to the screen         printf(\"x = %d\ \", x);          // loop 5 times         for( i = 0; i<5; i++)         {                 // output the current loop iteration                 printf(\"\ ITERATION %d\ \", i+1);                  // flush here so that the stdout buffer doesn\'t                 //              get printed in both processes                 fflush(stdout);                  // fork child process                 if ((pid = fork()) == -1)                 {                         perror(\"Error with fork\");                         exit(1);                 }                  // Child waits a second for the parent to go first                 else if (pid ==0)                 {                         sleep(1);                         // NOTE: may need to sleep more seconds for busy or slower OSes                 }                  // Both processes read x from file                 x = readX();                  // Parent prints parent, and performs subraction                 if (pid > 0)                 {                         printf(\"Parent: \");                         x -= 5;                 }                  // Child prints child, and performs division                 else if ( pid == 0 )                 {                         printf(\"Child: \");                         x = x/5;                 }                  // Both processes output x value and write x to file...                 printf(\"x = %d\ \", x);                 writeX(x);                  // The child terminates                 if (pid == 0)                 {                         exit(0);                 }                  // Parent waits for child to terminate before continuing loop                 wait(NULL);         }          exit(0); }  /// Returns the value read from .shareX.dat int readX() {         char xChar[10];         // xChar: our value as a char         int fd;                         // fd: file descriptor          // open to read and store x         if ( (fd = open(\".shareX.dat\", O_RDONLY )) == -1 )         {                 perror(\"Error opening file\");                 exit(2);         }          // read xChar from the file         if ( read(fd, xChar, 10) == -1 )         {                 perror(\"Error reading file\");                 exit(3);         }          // close file for reading         close(fd);          // convert xChar to int and return         return  atoi(xChar); }  /// Writes the writeX value to the file .shareX.dat void writeX(int writeX) {         char xChar[10];         // xChar: our value as a char         int fd;                         // fd: file descriptor         int xBytes;                     // how much to write          // open, clear, and create file if not createdi         if ( (fd = open(\".shareX.dat\",                                         O_CREAT | O_TRUNC | O_WRONLY, 0644 )) == -1 )         {                 perror(\"Error opening file\");                 exit(4);         }          // convert x to char         xBytes = sprintf(xChar, \"%d\", writeX);          // put xChar in file         if ( write(fd, xChar, xBytes) == -1 )         {                 perror(\"Error writing to file\");                 exit(5);         }          // close the file for writing         close(fd);          return; }