#include <stdio.h>
#include <fcntl.h>
/**********************************************************************/
main ()
{
 int fd, messageLen, i;
 char message [100];
  /* Prepare message */
 sprintf (message, "Hello from PID %d", getpid ());
 messageLen = strlen (message) + 1;
  do /* Keep trying to open the file until successful */
   {
     fd = open ("aPipe", O_WRONLY); /* Open named pipe for writing */
     if (fd == -1) sleep (1); /* Try again in 1 second */
   }
 while (fd == -1);
  for (i = 1; i <= 3; i++) /* Send three messages */
   {
     write (fd, message, messageLen); /* Write message down pipe */
     sleep (3); /* Pause a while */
   }
  close (fd); /* Close pipe descriptor */
}