Stuff

#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>

int main(void) {
   pid_t childpid;

   int fd[2]; //file descriptor1

   if (pipe(fd)==-1) {
     printf(" pipe failed \n" );
   }

   childpid = fork();

   if (childpid==0) {                                  /* ls is the child */
     if (dup2(fd[1] , 1) == -1) {
       perror("Failed to redirect stdout of ls");
     }
     else if ((close(fd[0]) == -1) || (close(fd[1]) == -1)) {
       perror("failed at closing");
     }
     else {
       if (execl("/bin/cat", "cat", "sortthis.txt", NULL) == -1) {
         perror("catting test failed");
       }
     }
     return 1;
   }

   int fd2[2];
   pipe(fd2);


   if (dup2(fd[0], 0) == -1)                /* sort is the parent */
       perror("Failed to redirect stdin of sort");
   else if ((close(fd[0]) == -1) || (close(fd[1]) == -1)) {
     perror("failed at closing");
   }
  
   else {
     //Output (1) of execl should go into fd2[1] not into terminal!
     if (dup2(1,fd2[1])==-1) {
       perror("I blame charlie");
     }
     if (execl("/usr/bin/sort", "sort", "-r", NULL) == -1) {
       perror("could not sort anything");
     }
   }

   //Now lets pray that somehow the output from sort will go into WC


   childpid = fork();



   if (childpid==0) {                               // WC //
     if (dup2(fd2[0] , 0) == -1) {
       perror("Failed to redirect stdout of  sort");
     }
     else if ((close(fd2[0]) == -1) || (close(fd2[1]) == -1)) {
       perror("failed at closing");
     }
     else {
       if (execl("/usr/bin/wc", "wc", "-cl", NULL) == -1) {
         perror("catting sort output failed");
       }
     }
     return 1;
    }

   //Ignore parent for now...
   return 1;
}