183 	 * test. We use a pipe to communicate with the child.  in test2()
191 	if (pipe(pfd) < 0)  in test2()
192 		err(1, "pipe");  in test2()
212 			err(1, "writing to pipe (child)");  in test2()
222 		err(1, "reading from pipe (child)");  in test2()
254 	 * test. We use a pipe to communicate with the child.  in test3()
262 	if (pipe(pfd) < 0)  in test3()
263 		err(1, "pipe");  in test3()
283 			err(1, "writing to pipe (child)");  in test3()
293 		err(1, "reading from pipe (child)");  in test3()
324 	 * test. We use a pipe to communicate with the child.  in test4()
331 	if (pipe(pfd) < 0)  in test4()
332 		err(1, "pipe");  in test4()
352 			err(1, "writing to pipe (child)");  in test4()
362 		err(1, "reading from pipe (child)");  in test4()
402 	 * blocked on the parent's lock, we can't easily use a pipe to  in test5()
495 	 * on the parent's lock, we can't easily use a pipe to  in test6()
598 	 * test. We use a pipe to communicate with the child.  in test7()
606 	if (pipe(pfd) < 0)  in test7()
607 		err(1, "pipe");  in test7()
627 			err(1, "writing to pipe (child)");  in test7()
637 		err(1, "reading from pipe (child)");  in test7()
670 	 * test. We use a pipe to communicate with the child.  in test8()
678 	if (pipe(pfd) < 0)  in test8()
679 		err(1, "pipe");  in test8()
699 			err(1, "writing to pipe (child)");  in test8()
709 		err(1, "reading from pipe (child)");  in test8()
747 	 * test. We use a pipe to communicate with the child.  in test9()
755 	if (pipe(pfd) < 0)  in test9()
756 		err(1, "pipe");  in test9()
776 			err(1, "writing to pipe (child)");  in test9()
786 		err(1, "reading from pipe (child)");  in test9()
819 	 * test. We use a pipe to communicate with the child.  in test10()
826 	if (pipe(pfd) < 0)  in test10()
827 		err(1, "pipe");  in test10()
851 			err(1, "writing to pipe (child)");  in test10()
861 		err(1, "reading from pipe (child)");  in test10()
972 	 * test. We use a pipe to communicate with the child.  in test12()
980 	if (pipe(pfd) < 0)  in test12()
981 		err(1, "pipe");  in test12()
1001 			err(1, "writing to pipe (child)");  in test12()
1012 		err(1, "reading from pipe (child)");  in test12()
1049 	 * test. We use a pipe to communicate with the child.  in test13()
1063 		if (pipe(pfd) < 0)  in test13()
1064 			err(1, "pipe");  in test13()
1084 				err(1, "writing to pipe (child)");  in test13()
1097 			err(1, "reading from pipe (child)");  in test13()
1333 	 * test. We use a pipe to communicate with the child.  in test15()
1345 	if (pipe(pfd) < 0)  in test15()
1346 		err(1, "pipe");  in test15()
1365 			err(1, "writing to pipe (child)");  in test15()
1375 		err(1, "reading from pipe (child)");  in test15()
1442 	 * test. We use a pipe to communicate with the child.  in test16()
1452 	if (pipe(pfd) < 0)  in test16()
1453 		err(1, "pipe");  in test16()
1473 			err(1, "writing to pipe (child)");  in test16()
1483 		err(1, "reading from pipe (child)");  in test16()