pfds 823 user/usertests.c int pfds[2]; pfds 843 user/usertests.c pipe(pfds); pfds 850 user/usertests.c close(pfds[0]); pfds 851 user/usertests.c if(write(pfds[1], "x", 1) != 1) pfds 853 user/usertests.c close(pfds[1]); pfds 858 user/usertests.c close(pfds[1]); pfds 859 user/usertests.c if(read(pfds[0], buf, sizeof(buf)) != 1){ pfds 863 user/usertests.c close(pfds[0]);