Add a test for r228510.

tools/regression/pipe/pipe-reverse2.c

@@ -0,0 +1,67 @@
+/*-
+ * Copyright (c) 2010 Jilles Tjoelker
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#include	<sys/select.h>
+
+#include	<err.h>
+#include	<stdio.h>
+#include	<unistd.h>
+
+/*
+ * Check that pipes can be selected for writing in the reverse direction.
+ */
+int
+main(int argc, char *argv[])
+{
+	int pip[2];
+	fd_set set;
+	int n;
+
+	if (pipe(pip) == -1)
+		err(1, "FAIL: pipe");
+
+	FD_ZERO(&set);
+	FD_SET(pip[0], &set);
+	n = select(pip[1] + 1, NULL, &set, NULL, &(struct timeval){ 0, 0 });
+	if (n != 1)
+		errx(1, "FAIL: select initial reverse direction");
+
+	n = write(pip[0], "x", 1);
+	if (n != 1)
+		err(1, "FAIL: write reverse direction");
+
+	FD_ZERO(&set);
+	FD_SET(pip[0], &set);
+	n = select(pip[1] + 1, NULL, &set, NULL, &(struct timeval){ 0, 0 });
+	if (n != 1)
+		errx(1, "FAIL: select reverse direction after write");
+
+	printf("PASS\n");
+
+	return (0);
+}