Added a regression test for r234131.

Discussed with:	 asomers
Sponsored by:	EMC / Isilon storage division

tests/sys/kern/Makefile

@@ -2,7 +2,8 @@
 
 TESTSDIR=	${TESTSBASE}/sys/kern
 
-ATF_TESTS_C=	unix_seqpacket_test
+ATF_TESTS_C+=	kern_descrip_test
+ATF_TESTS_C+=	unix_seqpacket_test
 TEST_METADATA.unix_seqpacket_test+=	timeout="15"
 
 LDADD+=		-lpthread

tests/sys/kern/kern_descrip_test.c

@@ -0,0 +1,80 @@
+/*-
+ * Copyright (c) 2013 EMC Corp.
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <strings.h>
+#include <sys/limits.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <atf-c.h>
+
+ATF_TC_WITHOUT_HEAD(dup2_simple);
+ATF_TC_BODY(dup2_simple, tc)
+{
+	int fd1, fd2;
+	struct stat sb1, sb2;
+
+	fd1 = open("/etc/passwd", O_RDONLY);
+	ATF_REQUIRE(fd1 >= 0);
+	fd2 = 27;
+	ATF_REQUIRE(dup2(fd1, fd2) != -1);
+	ATF_REQUIRE(fstat(fd1, &sb1) != -1);
+	ATF_REQUIRE(fstat(fd2, &sb2) != -1);
+	ATF_REQUIRE(bcmp(&sb1, &sb2, sizeof(sb1)) == 0);
+}
+
+/*
+   Regression test for r234131:
+   Return EBADF instead of EMFILE from dup2 when the second argument is
+   outside the range of valid file descriptors
+ */
+
+ATF_TC_WITHOUT_HEAD(dup2_r234131);
+ATF_TC_BODY(dup2_r234131, tc)
+{
+	int fd1, fd2, ret;
+
+	fd1 =  open("/etc/passwd", O_RDONLY);
+	fd2 = INT_MAX;
+	ret = dup2(fd1, fd2);
+	ATF_CHECK_EQ(-1, ret);
+	ATF_CHECK_EQ(EBADF, errno);
+}
+
+ATF_TP_ADD_TCS(tp)
+{
+
+        ATF_TP_ADD_TC(tp, dup2_simple);
+        ATF_TP_ADD_TC(tp, dup2_r234131);
+
+        return atf_no_error();
+}