// Simple pipe example

#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <unistd.h>
#include <sys/types.h>
#include <string.h>

int main(void) {
   int fd[2];
   pid_t pid;  
   char buffer[10] = {0};
   if( pipe(fd) < 0){
        perror(NULL);
        exit(1);
   }
   pid = fork();
   assert(pid >= 0);
   if (pid != 0) {  // parent
      
      close(fd[0]); // writer, don't need fd[0]
      write(fd[1], "123456789", 10);
      write(fd[1], "abcdefghi", 10);
      close(fd[1]);
   }
   else {       
     
      // child
      close(fd[1]); // reader, don't need fd[1]
      read(fd[0], buffer, sizeof(buffer));
      printf("got \"%s\"\n", buffer);
      read(fd[0], buffer, sizeof(buffer));
      printf("got \"%s\"\n", buffer);
      close(fd[0]);
   }
   return 0;
}