ast_comparator/test/student_data/handout/shlab-handout/cases/42_tsh.c
/*
 * waitfg - Block until process pid is no longer the foreground process
 */
Block until process pid is no longer the foreground process
Block until process pid is no longer the foreground process
void waitfg(pid_t pid)
{
	while(pid == fgpid(jobs))
		sleep(1);
	return;
}
void waitfg ( pid_t pid ) { while ( pid == fgpid ( jobs ) ) sleep ( 1 ) ; return ; }
waitfg - Block until process pid is no longer the foreground process
waitfg - Block until process pid is no longer the foreground process
/* If current foreground job is done,
	 * fgpid(jobs) return 0: end of while loop.
	 * */