Fix two failing tests after ATF update

Since https://github.com/freebsd/atf/commit/4581cefc1e3811dd3c926b5dd4b15fd63d2e19da
ATF opens the results file on startup. This fixes problems like
capsicumized tests not being able to open the file on exit.

However, this test closes all file descriptors just to check that
socketpair returns fd 3+4 and thereby also closes the ATF results file.
This then results in an EBADF when writing the result so the test is
reported as broken.

While system calls that create new file descriptors (must?) use the lowest
available file descriptor number, it does not seem useful to test this
property here. Drop the check for FD==3/4 to unbreak the testsuite.

We could also try to re-open the results file in ATF if we get a EBADF
error, but that will fail when running under Capsicum.

Reviewed By:	cem
Differential Revision: https://reviews.freebsd.org/D28683

(cherry picked from commit 10fc4c3218381fef7189a5b8d46a757cd1989dff)

2 files changed, 23 insertions, 6 deletions

diff --git a/contrib/netbsd-tests/lib/libc/sys/t_pipe2.c b/contrib/netbsd-tests/lib/libc/sys/t_pipe2.c
index 48f973488c7a..1b62fa630fd5 100644
--- a/contrib/netbsd-tests/lib/libc/sys/t_pipe2.c
+++ b/contrib/netbsd-tests/lib/libc/sys/t_pipe2.c
@@ -53,17 +53,19 @@ run(int flags)
 	while ((i = open("/", O_RDONLY)) < 3)
 		ATF_REQUIRE(i != -1);
 
-#ifdef __FreeBSD__
-	closefrom(3);
-#else
+#ifdef __NetBSD__
+	/* This check is harmful since it closes atf's output file */
 	ATF_REQUIRE_MSG(closefrom(3) != -1, "closefrom failed: %s",
 	    strerror(errno));
 #endif
 
 	ATF_REQUIRE(pipe2(fd, flags) == 0);
 
+#ifdef __NetBSD__
+	/* This check is harmful since it requires closing atf's output file */
 	ATF_REQUIRE(fd[0] == 3);
 	ATF_REQUIRE(fd[1] == 4);
+#endif
 
 	if (flags & O_CLOEXEC) {
 		ATF_REQUIRE((fcntl(fd[0], F_GETFD) & FD_CLOEXEC) != 0);
diff --git a/contrib/netbsd-tests/lib/libc/sys/t_socketpair.c b/contrib/netbsd-tests/lib/libc/sys/t_socketpair.c
index 246b584d496a..165a42971d64 100644
--- a/contrib/netbsd-tests/lib/libc/sys/t_socketpair.c
+++ b/contrib/netbsd-tests/lib/libc/sys/t_socketpair.c
@@ -63,16 +63,18 @@ run(int domain, int type, int flags)
 	while ((i = open("/", O_RDONLY)) < 3)
 		ATF_REQUIRE(i != -1);
 
-#ifdef __FreeBSD__
-	closefrom(3);
-#else
+#ifdef __NetBSD__
+	/* This check is harmful since it closes atf's output file */
 	ATF_REQUIRE(closefrom(3) != -1);
 #endif
 
 	ATF_REQUIRE(socketpair(domain, type | flags, 0, fd) == 0);
 
+#if __NetBSD__
+	/* This check is harmful since it requires closing atf's output file */
 	ATF_REQUIRE(fd[0] == 3);
 	ATF_REQUIRE(fd[1] == 4);
+#endif
 
 	connected(fd[0]);
 	connected(fd[1]);
@@ -125,12 +127,25 @@ ATF_TC_BODY(null_sv, tc)
 {
 	int fd;
 
+#ifdef __NetBSD__
+	/* This check is harmful since it closes atf's output file */
 	closefrom(3);
+#else
+	int lowfd = open("/", O_RDONLY);
+	ATF_REQUIRE(lowfd > 0);
+	ATF_REQUIRE_EQ(0, close(lowfd));
+#endif
 	ATF_REQUIRE_EQ(socketpair(AF_UNIX, SOCK_DGRAM, 0, NULL), -1);
 	ATF_REQUIRE_EQ(EFAULT, errno);
 	fd = open("/", O_RDONLY);
+#ifdef __NetBSD__
 	ATF_REQUIRE_EQ_MSG(fd, 3,
 	    "socketpair(..., NULL) allocated descriptors");
+#else
+	ATF_REQUIRE_EQ_MSG(fd, lowfd,
+	    "socketpair(..., NULL) allocated descriptors: fd=%d, lowfd=%d",
+	    fd, lowfd);
+#endif
 }
 
 ATF_TC(socketpair_basic);