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

 int main()
 {
   int rc;
   int p[2];
   char buffer[20];   // getpid(): parent 20608
   rc = pipe( p );
   printf( "%d %d %d\n", getpid(), p[0], p[1] );
   rc = fork();
   if ( rc == 0 ) {
     rc = write( p[0], "ABCDEFGHIJKLMNOPQRSTUVWXYZ", 26 );
   }
   if ( rc > 0 ) {
     rc = read( p[1], buffer, 20 );
     buffer[rc] = '\0';
     printf( "%d %s\n", getpid(), buffer );
   }
   printf( "BYE\n" );
   return 0;
 }