/* Demonstrate vfork. Note that the parent now sleeps until      */
/* the exec call terminates, waiting for the execed process to   */
/* terminate.  							 */
/* Sample calls (executable named waitdemo):			 */
/* waitdemo ls -l | more					 */
/* waitdemo cat testvfork.c					 */
#include <sys/types.h>
#include <unistd.h>
#include <stdio.h>

main(argc,argv)
int argc;
char *argv[];
{FILE *fp;
 pid_t IsParent;
 IsParent=vfork();
 if (IsParent) {
  wait(NULL);
  fprintf(stdout,"Parent Returns!\n"); 
  /* Don't need to flush. stderr is also not buffered */
 }
 else {
  execvp(argv[1],argv+1);
 }
}