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#include <stdio.h> #include <unistd.h> #define PROCS 5 int main () { int pid, pr

ID: 3557501 • Letter: #

Question

#include <stdio.h>
#include <unistd.h>

#define PROCS 5

int main () {
   int pid, proc, checkTotal, pidTotal = 0, reportFds[2];

   pipe(reportFds);

   /* Create PROCS children, call them child 0 through child PROCS-1 */
   for (proc = 0; proc < PROCS; proc++) {
      if (!(pid = fork())) {
         dup2(reportFds[0], 0);
         close(reportFds[0]);
         close(reportFds[1]);
      }
      else
         pidTotal += pid;
   }

   for (proc = 0; proc < PROCS; proc++) {
      if (0 < read(reportFds[0], &pid, sizeof(pid))) {
         printf("Good read ");
         pidTotal -= pid;
      }
   }
   if (pidTotal == 0 && 0 == read(reportFds[0], &pid, sizeof(pid)))
         printf("Good report and EOF ");

   return 0;
}

       
  Good read  Good read  Good read  Good read  Good read  Good report and EOF

Explanation / Answer

#include <stdio.h>
#include<sys/wait.h>
#include<stdlib.h>
#include <unistd.h>
#define PROCS 5
int main () {
int pid, proc, checkTotal, pidTotal = 0, reportFds[2];
int status;
pipe(reportFds);
/* Create PROCS children, call them child 0 through child PROCS-1 */
for (proc = 0; proc < PROCS; proc++) {
if (!(pid = fork())) {
dup2(reportFds[0], 0);
close(reportFds[0]);
write(reportFds[1],&pid,sizeof(pid));
}
else{
pidTotal += pid;
if (0 < read(reportFds[0], &pid, sizeof(pid))) {
printf("Good read ");
pidTotal -= pid;

}
}
}
wait(&status); //wait till child processs are over
if (pidTotal == 0)
printf("Good report and EOF ");

return 0;
}

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