tests: replace net-fd.test with net-y-unix.test

Unlike the former test that was based on match_grep,
the new one uses match_diff and does more rigorous testing.

* tests/net-y-unix.c: New file.
* tests/net-y-unix.test: New test.
* tests/net-fd.test: Remove.
* tests/net-fd.expected: Remove.
* tests/.gitignore: Add net-y-unix.
* tests/Makefile.am (check_PROGRAMS): Likewise.
(TESTS): Replace net-fd.test with net-y-unix.test.
(net-fd.log): Remove.
(EXTRA_DIST): Remove net-fd.expected.
diff --git a/tests/.gitignore b/tests/.gitignore
index ffd6356..f6347c0 100644
--- a/tests/.gitignore
+++ b/tests/.gitignore
@@ -57,6 +57,7 @@
 mq
 nanosleep
 net-accept-connect
+net-y-unix
 net-yy-inet
 net-yy-unix
 netlink_inet_diag
diff --git a/tests/Makefile.am b/tests/Makefile.am
index af8f7c9..667d863 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -104,6 +104,7 @@
 	mq \
 	nanosleep \
 	net-accept-connect \
+	net-y-unix \
 	net-yy-inet \
 	net-yy-unix \
 	netlink_inet_diag \
@@ -245,7 +246,7 @@
 	mmsg.test \
 	mq.test \
 	nanosleep.test \
-	net-fd.test \
+	net-y-unix.test \
 	net-yy-inet.test \
 	net-yy-unix.test \
 	net.test \
@@ -317,8 +318,6 @@
 XFAIL_TESTS_mx32 = $(LIBUNWIND_TESTS)
 XFAIL_TESTS = $(XFAIL_TESTS_$(MPERS_NAME))
 
-net-fd.log: net.log
-
 TEST_LOG_COMPILER = env
 AM_TEST_LOG_FLAGS = STRACE_ARCH=$(ARCH) $(srcdir)/run.sh
 
@@ -342,7 +341,6 @@
 	     memfd_create.expected \
 	     mq.expected \
 	     net.expected \
-	     net-fd.expected \
 	     oldselect.expected \
 	     pipe.expected \
 	     ppoll.expected \
diff --git a/tests/net-fd.expected b/tests/net-fd.expected
deleted file mode 100644
index 49b6992..0000000
--- a/tests/net-fd.expected
+++ /dev/null
@@ -1,5 +0,0 @@
-[1-9][0-9]* +[0-9]+:[0-9]+:[0-9]+\.[0-9]+ +bind\(0<socket:\[[0-9]+\]>, \{sa_family=AF_(LOCAL|UNIX|FILE), sun_path="net-fd-local-stream"\}, 22\) += 0
-[1-9][0-9]* +[0-9]+:[0-9]+:[0-9]+\.[0-9]+ +listen\(0<socket:\[[0-9]+\]>, 5\) += 0
-[1-9][0-9]* +[0-9]+:[0-9]+:[0-9]+\.[0-9]+ +getsockname\(0<socket:\[[0-9]+\]>, \{sa_family=AF_(LOCAL|UNIX|FILE), sun_path="net-fd-local-stream"\}, \[22\]\) += 0
-[1-9][0-9]* +[0-9]+:[0-9]+:[0-9]+\.[0-9]+ +accept\(0<socket:\[[0-9]+\]>, \{sa_family=AF_(LOCAL|UNIX|FILE), NULL\}, \[2\]\) += 1<socket:\[[0-9]+\]>
-[1-9][0-9]* +[0-9]+:[0-9]+:[0-9]+\.[0-9]+ +connect\(1<socket:\[[0-9]+\]>, \{sa_family=AF_(LOCAL|UNIX|FILE), sun_path="net-fd-local-stream"\}, 22\) += 0
diff --git a/tests/net-fd.test b/tests/net-fd.test
deleted file mode 100755
index ddef8fc..0000000
--- a/tests/net-fd.test
+++ /dev/null
@@ -1,16 +0,0 @@
-#!/bin/sh
-
-# Check how network syscalls are traced when decoding socket descriptors
-
-. "${srcdir=.}/init.sh"
-
-# strace -y is implemented using /proc/self/fd
-[ -d /proc/self/fd/ ] ||
-	framework_skip_ '/proc/self/fd/ is not available'
-
-run_prog ./net-accept-connect net-fd-local-stream
-# using -y to test socket descriptors 'paths' decoding
-run_strace_merge -y -enetwork $args
-match_grep
-
-exit 0
diff --git a/tests/net-y-unix.c b/tests/net-y-unix.c
new file mode 100644
index 0000000..421f502
--- /dev/null
+++ b/tests/net-y-unix.c
@@ -0,0 +1,230 @@
+/*
+ * This file is part of net-y-unix strace test.
+ *
+ * Copyright (c) 2013-2016 Dmitry V. Levin <ldv@altlinux.org>
+ * 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.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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 "tests.h"
+#include <assert.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/param.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+
+int
+main(int ac, const char **av)
+{
+	assert(ac == 2);
+
+	struct sockaddr_un addr = { .sun_family = AF_UNIX };
+	unsigned int sun_path_len = strlen(av[1]);
+	assert(sun_path_len > 0 && sun_path_len <= sizeof(addr.sun_path));
+	strncpy(addr.sun_path, av[1], sizeof(addr.sun_path));
+	struct sockaddr * const listen_sa = tail_memdup(&addr, sizeof(addr));
+
+	socklen_t * const len = tail_alloc(sizeof(socklen_t));
+	*len = offsetof(struct sockaddr_un, sun_path) + strlen(av[1]) + 1;
+	if (*len > sizeof(addr))
+		*len = sizeof(addr);
+
+	int listen_fd = socket(PF_LOCAL, SOCK_STREAM, 0);
+	if (listen_fd < 0)
+		perror_msg_and_skip("socket");
+	unsigned long listen_inode = inode_of_sockfd(listen_fd);
+	printf("socket(PF_LOCAL, SOCK_STREAM, 0) = %d<socket:[%lu]>\n",
+	       listen_fd, listen_inode);
+
+	(void) unlink(av[1]);
+	if (bind(listen_fd, listen_sa, *len))
+		perror_msg_and_skip("bind");
+	printf("bind(%d<socket:[%lu]>, {sa_family=AF_LOCAL, sun_path=\"%s\"}"
+	       ", %u) = 0\n", listen_fd, listen_inode, av[1], (unsigned) *len);
+
+	if (listen(listen_fd, 1))
+		perror_msg_and_skip("listen");
+	printf("listen(%d<socket:[%lu]>, 1) = 0\n", listen_fd, listen_inode);
+
+	unsigned int * const optval = tail_alloc(sizeof(unsigned int));
+	*len = sizeof(*optval);
+	if (getsockopt(listen_fd, SOL_SOCKET, SO_PASSCRED, optval, len))
+		perror_msg_and_fail("getsockopt");
+	printf("getsockopt(%d<socket:[%lu]>, SOL_SOCKET, SO_PASSCRED"
+	       ", [%u], [%u]) = 0\n",
+	       listen_fd, listen_inode, *optval, (unsigned) *len);
+
+	memset(listen_sa, 0, sizeof(addr));
+	*len = sizeof(addr);
+	if (getsockname(listen_fd, listen_sa, len))
+		perror_msg_and_fail("getsockname");
+	printf("getsockname(%d<socket:[%lu]>, {sa_family=AF_LOCAL"
+	       ", sun_path=\"%s\"}, [%u]) = 0\n", listen_fd, listen_inode,
+	       av[1], (unsigned) *len);
+
+	int connect_fd = socket(PF_LOCAL, SOCK_STREAM, 0);
+	if (connect_fd < 0)
+		perror_msg_and_fail("socket");
+	unsigned long connect_inode = inode_of_sockfd(connect_fd);
+	printf("socket(PF_LOCAL, SOCK_STREAM, 0) = %d<socket:[%lu]>\n",
+	       connect_fd, connect_inode);
+
+	if (connect(connect_fd, listen_sa, *len))
+		perror_msg_and_fail("connect");
+	printf("connect(%d<socket:[%lu]>, {sa_family=AF_LOCAL"
+	       ", sun_path=\"%s\"}, %u) = 0\n",
+	       connect_fd, connect_inode, av[1], (unsigned) *len);
+
+	struct sockaddr * const accept_sa = tail_alloc(sizeof(addr));
+	memset(accept_sa, 0, sizeof(addr));
+	*len = sizeof(addr);
+	int accept_fd = accept(listen_fd, accept_sa, len);
+	if (accept_fd < 0)
+		perror_msg_and_fail("accept");
+	unsigned long accept_inode = inode_of_sockfd(accept_fd);
+	printf("accept(%d<socket:[%lu]>, {sa_family=AF_LOCAL, NULL}"
+	       ", [%u]) = %d<socket:[%lu]>\n",
+	       listen_fd, listen_inode, (unsigned) *len,
+	       accept_fd, accept_inode);
+
+	memset(listen_sa, 0, sizeof(addr));
+	*len = sizeof(addr);
+	if (getpeername(connect_fd, listen_sa, len))
+		perror_msg_and_fail("getpeername");
+	printf("getpeername(%d<socket:[%lu]>, {sa_family=AF_LOCAL"
+	       ", sun_path=\"%s\"}, [%u]) = 0\n", connect_fd, connect_inode,
+	       av[1], (unsigned) *len);
+
+	char text[] = "text";
+	assert(sendto(connect_fd, text, sizeof(text) - 1, MSG_DONTWAIT, NULL, 0)
+	       == sizeof(text) - 1);
+	printf("sendto(%d<socket:[%lu]>, \"%s\", %u, MSG_DONTWAIT"
+	       ", NULL, 0) = %u\n",
+	       connect_fd, connect_inode, text,
+	       (unsigned) sizeof(text) - 1, (unsigned) sizeof(text) - 1);
+
+	assert(close(connect_fd) == 0);
+	printf("close(%d<socket:[%lu]>) = 0\n", connect_fd, connect_inode);
+
+	assert(recvfrom(accept_fd, text, sizeof(text) - 1, MSG_DONTWAIT, NULL, NULL)
+	       == sizeof(text) - 1);
+	printf("recvfrom(%d<socket:[%lu]>, \"%s\", %u, MSG_DONTWAIT"
+	       ", NULL, NULL) = %u\n",
+	       accept_fd, accept_inode, text,
+	       (unsigned) sizeof(text) - 1, (unsigned) sizeof(text) - 1);
+
+	assert(close(accept_fd) == 0);
+	printf("close(%d<socket:[%lu]>) = 0\n", accept_fd, accept_inode);
+
+	connect_fd = socket(PF_LOCAL, SOCK_STREAM, 0);
+	if (connect_fd < 0)
+		perror_msg_and_fail("socket");
+	connect_inode = inode_of_sockfd(connect_fd);
+	printf("socket(PF_LOCAL, SOCK_STREAM, 0) = %d<socket:[%lu]>\n",
+	       connect_fd, connect_inode);
+
+	*optval = 1;
+	*len = sizeof(*optval);
+	if (setsockopt(connect_fd, SOL_SOCKET, SO_PASSCRED, optval, *len))
+		perror_msg_and_fail("setsockopt");
+	printf("setsockopt(%d<socket:[%lu]>, SOL_SOCKET, SO_PASSCRED"
+	       ", [%u], %u) = 0\n",
+	       connect_fd, connect_inode, *optval, (unsigned) *len);
+
+	memset(listen_sa, 0, sizeof(addr));
+	*len = sizeof(addr);
+	if (getsockname(listen_fd, listen_sa, len))
+		perror_msg_and_fail("getsockname");
+	printf("getsockname(%d<socket:[%lu]>, {sa_family=AF_LOCAL"
+	       ", sun_path=\"%s\"}, [%u]) = 0\n",
+	       listen_fd, listen_inode, av[1], (unsigned) *len);
+
+	if (connect(connect_fd, listen_sa, *len))
+		perror_msg_and_fail("connect");
+	printf("connect(%d<socket:[%lu]>, {sa_family=AF_LOCAL"
+	       ", sun_path=\"%s\"}, %u) = 0\n",
+	       connect_fd, connect_inode, av[1], (unsigned) *len);
+
+	memset(accept_sa, 0, sizeof(addr));
+	*len = sizeof(addr);
+	accept_fd = accept(listen_fd, accept_sa, len);
+	if (accept_fd < 0)
+		perror_msg_and_fail("accept");
+	accept_inode = inode_of_sockfd(accept_fd);
+	const char * const sun_path1 =
+		((struct sockaddr_un *) accept_sa) -> sun_path + 1;
+	printf("accept(%d<socket:[%lu]>, {sa_family=AF_LOCAL"
+	       ", sun_path=@\"%s\"}, [%u]) = %d<socket:[%lu]>\n",
+	       listen_fd, listen_inode, sun_path1, (unsigned) *len,
+	       accept_fd, accept_inode);
+
+	memset(listen_sa, 0, sizeof(addr));
+	*len = sizeof(addr);
+	if (getpeername(connect_fd, listen_sa, len))
+		perror_msg_and_fail("getpeername");
+	printf("getpeername(%d<socket:[%lu]>, {sa_family=AF_LOCAL"
+	       ", sun_path=\"%s\"}, [%u]) = 0\n",
+	       connect_fd, connect_inode, av[1], (unsigned) *len);
+
+	memset(accept_sa, 0, sizeof(addr));
+	*len = sizeof(addr);
+	if (getsockname(connect_fd, accept_sa, len))
+		perror_msg_and_fail("getsockname");
+	printf("getsockname(%d<socket:[%lu]>, {sa_family=AF_LOCAL"
+	       ", sun_path=@\"%s\"}, [%u]) = 0\n",
+	       connect_fd, connect_inode, sun_path1, (unsigned) *len);
+
+	assert(sendto(connect_fd, text, sizeof(text) - 1, MSG_DONTWAIT, NULL, 0)
+	       == sizeof(text) - 1);
+	printf("sendto(%d<socket:[%lu]>, \"%s\", %u, MSG_DONTWAIT"
+	       ", NULL, 0) = %u\n",
+	       connect_fd, connect_inode, text,
+	       (unsigned) sizeof(text) - 1, (unsigned) sizeof(text) - 1);
+
+	assert(close(connect_fd) == 0);
+	printf("close(%d<socket:[%lu]>) = 0\n", connect_fd, connect_inode);
+
+	assert(recvfrom(accept_fd, text, sizeof(text) - 1, MSG_DONTWAIT, NULL, NULL)
+	       == sizeof(text) - 1);
+	printf("recvfrom(%d<socket:[%lu]>, \"%s\", %u, MSG_DONTWAIT"
+	       ", NULL, NULL) = %u\n",
+	       accept_fd, accept_inode, text,
+	       (unsigned) sizeof(text) - 1, (unsigned) sizeof(text) - 1);
+
+	assert(close(accept_fd) == 0);
+	printf("close(%d<socket:[%lu]>) = 0\n", accept_fd, accept_inode);
+
+	assert(unlink(av[1]) == 0);
+
+	assert(close(listen_fd) == 0);
+	printf("close(%d<socket:[%lu]>) = 0\n",
+	       listen_fd, listen_inode);
+
+	puts("+++ exited with 0 +++");
+	return 0;
+}
diff --git a/tests/net-y-unix.test b/tests/net-y-unix.test
new file mode 100755
index 0000000..9076158
--- /dev/null
+++ b/tests/net-y-unix.test
@@ -0,0 +1,48 @@
+#!/bin/sh
+#
+# Check decoding of network syscalls in -y mode.
+#
+# Copyright (c) 2016 Dmitry V. Levin <ldv@altlinux.org>
+# 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.
+# 3. The name of the author may not be used to endorse or promote products
+#    derived from this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
+
+. "${srcdir=.}/init.sh"
+
+# strace -y is implemented using /proc/self/fd
+[ -d /proc/self/fd/ ] ||
+	framework_skip_ '/proc/self/fd/ is not available'
+
+check_prog sed
+
+addr="${ME_%.test}-local-stream"
+run_prog "./${ME_%.test}" $addr > /dev/null
+
+OUT="$LOG.out"
+EXP="$LOG.exp"
+run_strace -a20 -y -eclose,network $args > "$EXP"
+# Filter out close() calls made by ld.so and libc.
+sed -n '/socket/,$p' < "$LOG" > "$OUT"
+
+match_diff "$OUT" "$EXP"
+rm -f "$EXP" "$OUT"