pfds              859 user/usertests.c   int pfds[2];
pfds              879 user/usertests.c   pipe(pfds);
pfds              886 user/usertests.c     close(pfds[0]);
pfds              887 user/usertests.c     if (write(pfds[1], "x", 1) != 1)
pfds              889 user/usertests.c     close(pfds[1]);
pfds              894 user/usertests.c   close(pfds[1]);
pfds              895 user/usertests.c   if (read(pfds[0], buf, sizeof(buf)) != 1) {
pfds              899 user/usertests.c   close(pfds[0]);