Add regression tests for UNIX domain socket garbage collection. Should be

run from single-user mode, as they look at global open file and inflight
descriptor counts to check for leaks.

2 files changed, 770 insertions, 0 deletions

diff --git a/tools/regression/sockets/unix_gc/Makefile b/tools/regression/sockets/unix_gc/Makefile
new file mode 100644
index 0000000..1e2fd56
--- /dev/null
+++ b/tools/regression/sockets/unix_gc/Makefile
@@ -0,0 +1,7 @@
+# $FreeBSD$
+
+PROG=	unix_gc
+WARNS=	3
+NO_MAN=
+
+.include <bsd.prog.mk>
diff --git a/tools/regression/sockets/unix_gc/unix_gc.c b/tools/regression/sockets/unix_gc/unix_gc.c
new file mode 100644
index 0000000..347e501
--- /dev/null
+++ b/tools/regression/sockets/unix_gc/unix_gc.c
@@ -0,0 +1,763 @@
+/*-
+ * Copyright (c) 2007 Robert N. M. Watson
+ * 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.
+ *
+ * $FreeBSD$
+ */
+
+/*
+ * A few regression tests for UNIX domain sockets.  Run from single-user mode
+ * as it checks the openfiles sysctl to look for leaks, and we don't want that
+ * changing due to other processes doing stuff.
+ */
+
+#include <sys/types.h>
+#include <sys/signal.h>
+#include <sys/socket.h>
+#include <sys/sysctl.h>
+#include <sys/un.h>
+#include <sys/wait.h>
+
+#include <netinet/in.h>
+
+#include <err.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+static int forcegc = 1;
+static char dpath[PATH_MAX];
+static const char *test;
+
+static int
+getopenfiles(void)
+{
+	size_t len;
+	int i;
+
+	len = sizeof(i);
+	if (sysctlbyname("kern.openfiles", &i, &len, NULL, 0) < 0)
+		err(-1, "kern.openfiles");
+	return (i);
+}
+
+static int
+getinflight(void)
+{
+	size_t len;
+	int i;
+
+	len = sizeof(i);
+	if (sysctlbyname("net.local.inflight", &i, &len, NULL, 0) < 0)
+		err(-1, "net.local.inflight");
+	return (i);
+}
+
+static void
+sendfd(int fd, int fdtosend)
+{
+	struct msghdr mh;
+	struct message { struct cmsghdr msg_hdr; int fd; } m;
+	ssize_t len;
+	int after_inflight, before_inflight;
+
+	before_inflight = getinflight();
+
+	bzero(&mh, sizeof(mh));
+	bzero(&m, sizeof(m));
+	mh.msg_control = &m;
+	mh.msg_controllen = sizeof(m);
+	m.msg_hdr.cmsg_len = sizeof(m);
+	m.msg_hdr.cmsg_level = SOL_SOCKET;
+	m.msg_hdr.cmsg_type = SCM_RIGHTS;
+	m.fd = fdtosend;
+	len = sendmsg(fd, &mh, 0);
+	if (len < 0)
+		err(-1, "%s: sendmsg", test);
+	after_inflight = getinflight();
+	if (after_inflight != before_inflight + 1)
+		errx(-1, "%s: sendfd: before %d after %d\n", test,
+		    before_inflight, after_inflight);
+}
+
+static void
+close2(int fd1, int fd2)
+{
+
+	close(fd1);
+	close(fd2);
+}
+
+static void
+close3(int fd1, int fd2, int fd3)
+{
+
+	close2(fd1, fd2);
+	close(fd3);
+}
+
+static void
+close4(int fd1, int fd2, int fd3, int fd4)
+{
+
+	close2(fd1, fd2);
+	close2(fd3, fd4);
+}
+
+static void
+close5(int fd1, int fd2, int fd3, int fd4, int fd5)
+{
+
+	close3(fd1, fd2, fd3);
+	close2(fd4, fd5);
+}
+
+static int
+my_socket(int domain, int type, int proto)
+{
+	int sock;
+
+	sock = socket(domain, type, proto);
+	if (sock < 0)
+		err(-1, "%s: socket", test);
+	return (sock);
+}
+
+static void
+my_bind(int sock, struct sockaddr *sa, socklen_t len)
+{
+
+	if (bind(sock, sa, len) < 0)
+		err(-1, "%s: bind", test);
+}
+
+static void
+my_connect(int sock, struct sockaddr *sa, socklen_t len)
+{
+
+	if (connect(sock, sa, len) < 0)
+		err(-1, "%s: connect", test);
+}
+
+static void
+my_listen(int sock, int backlog)
+{
+
+	if (listen(sock, backlog) < 0)
+		err(-1, "%s: listen", test);
+}
+
+static void
+my_socketpair(int *sv)
+{
+
+	if (socketpair(PF_UNIX, SOCK_STREAM, 0, sv) < 0)
+		err(-1, "%s: socketpair", test);
+}
+
+static void
+my_getsockname(int s, struct sockaddr *sa, socklen_t *salen)
+{
+
+	if (getsockname(s, sa, salen) < 0)
+		err(-1, "%s: getsockname", test);
+}
+
+static void
+setnonblock(int s)
+{
+
+	if (fcntl(s, F_SETFL, O_NONBLOCK) < 0)
+		err(-1, "%s: fcntl(F_SETFL, O_NONBLOCK)", test);
+}
+
+static void
+alloc3fds(int *s, int *sv)
+{
+
+	if ((*s = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
+		err(-1, "%s: socket", test);
+	if (socketpair(PF_UNIX, SOCK_STREAM, 0, sv) < 0)
+		err(-1, "%s: socketpair", test);
+}
+
+static void
+alloc5fds(int *s, int *sva, int *svb)
+{
+
+	if ((*s = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
+		err(-1, "%s: socket", test);
+	if (socketpair(PF_UNIX, SOCK_STREAM, 0, sva) < 0)
+		err(-1, "%s: socketpair", test);
+	if (socketpair(PF_UNIX, SOCK_STREAM, 0, svb) < 0)
+		err(-1, "%s: socketpair", test);
+}
+
+static void
+save_sysctls(int *before_inflight, int *before_openfiles)
+{
+
+	*before_inflight = getinflight();
+	*before_openfiles = getopenfiles();
+}
+
+/*
+ * Try hard to make sure that the GC does in fact run before we test the
+ * condition of things.
+ */
+static void
+trigger_gc(void)
+{
+	int s;
+
+	if (forcegc) {
+		if ((s = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
+			err(-1, "trigger_gc: socket");
+		close(s);
+	}
+	sleep(1);
+}
+
+static void
+test_sysctls(int before_inflight, int before_openfiles)
+{
+	int after_inflight, after_openfiles;
+
+	trigger_gc();
+	after_inflight = getinflight();
+	if (after_inflight != before_inflight)
+		warnx("%s: before inflight: %d, after inflight: %d",
+		    test, before_inflight, after_inflight);
+
+	after_openfiles = getopenfiles();
+	if (after_openfiles != before_openfiles)
+		warnx("%s: before: %d, after: %d", test, before_openfiles,
+		    after_openfiles);
+}
+
+static void
+twosome_nothing(void)
+{
+	int inflight, openfiles;
+	int sv[2];
+
+	/*
+	 * Create a pair, close in one order.
+	 */
+	test = "twosome_nothing1";
+	printf("%s\n", test);
+	save_sysctls(&inflight, &openfiles);
+	my_socketpair(sv);
+	close2(sv[0], sv[1]);
+	test_sysctls(inflight, openfiles);
+
+	/*
+	 * Create a pair, close in the other order.
+	 */
+	test = "twosome_nothing2";
+	printf("%s\n", test);
+	save_sysctls(&inflight, &openfiles);
+	my_socketpair(sv);
+	close2(sv[0], sv[1]);
+	test_sysctls(inflight, openfiles);
+}
+
+/*
+ * Using a socket pair, send various endpoints over the pair and close in
+ * various orders.
+ */
+static void
+twosome_drop_work(const char *testname, int sendvia, int tosend, int closefirst)
+{
+	int inflight, openfiles;
+	int sv[2];
+
+	printf("%s\n", testname);
+	test = testname;
+	save_sysctls(&inflight, &openfiles);
+	my_socketpair(sv);
+	sendfd(sv[sendvia], sv[tosend]);
+	if (closefirst == 0)
+		close2(sv[0], sv[1]);
+	else
+		close2(sv[1], sv[0]);
+	test_sysctls(inflight, openfiles);
+}
+
+static void
+twosome_drop(void)
+{
+
+	/*
+	 * In various combations, some wastefully symmetric, create socket
+	 * pairs and send one or another endpoint over one or another
+	 * endpoint, closing the endpoints in various orders.
+	 */
+	twosome_drop_work("twosome_drop1", 0, 0, 0);
+	twosome_drop_work("twosome_drop2", 0, 0, 1);
+	twosome_drop_work("twosome_drop3", 0, 1, 0);
+	twosome_drop_work("twosome_drop4", 0, 1, 1);
+	twosome_drop_work("twosome_drop5", 1, 0, 0);
+	twosome_drop_work("twosome_drop6", 1, 0, 1);
+	twosome_drop_work("twosome_drop7", 1, 1, 0);
+	twosome_drop_work("twosome_drop8", 1, 1, 1);
+}
+
+static void
+threesome_nothing(void)
+{
+	int inflight, openfiles;
+	int s, sv[2];
+
+	test = "threesome_nothing";
+	printf("%s\n", test);
+	save_sysctls(&inflight, &openfiles);
+	alloc3fds(&s, sv);
+	close3(s, sv[0], sv[1]);
+	test_sysctls(inflight, openfiles);
+}
+
+/*
+ * threesome_drop: create a pair and a spare, send the spare over the pair, and
+ * close in various orders and make sure all the fds went away.
+ */
+static void
+threesome_drop(void)
+{
+	int inflight, openfiles;
+	int s, sv[2];
+
+	/*
+	 * threesome_drop1: close sent send receive
+	 */
+	test = "threesome_drop1";
+	printf("%s\n", test);
+	save_sysctls(&inflight, &openfiles);
+	alloc3fds(&s, sv);
+	sendfd(sv[0], s);
+	close3(s, sv[0], sv[1]);
+	test_sysctls(inflight, openfiles);
+
+	/*
+	 * threesome_drop2: close sent receive send
+	 */
+	test = "threesome_drop2";
+	printf("%s\n", test);
+	save_sysctls(&inflight, &openfiles);
+	alloc3fds(&s, sv);
+	sendfd(sv[0], s);
+	close3(s, sv[1], sv[0]);
+	test_sysctls(inflight, openfiles);
+
+	/*
+	 * threesome_drop3: close receive sent send
+	 */
+	test = "threesome_drop3";
+	printf("%s\n", test);
+	save_sysctls(&inflight, &openfiles);
+	alloc3fds(&s, sv);
+	sendfd(sv[0], s);
+	close3(sv[1], s, sv[0]);
+	test_sysctls(inflight, openfiles);
+
+	/*
+	 * threesome_drop4: close receive send sent
+	 */
+	test = "threesome_drop4";
+	printf("%s\n", test);
+	save_sysctls(&inflight, &openfiles);
+	alloc3fds(&s, sv);
+	sendfd(sv[0], s);
+	close3(sv[1], sv[0], s);
+	test_sysctls(inflight, openfiles);
+
+	/*
+	 * threesome_drop5: close send receive sent
+	 */
+	test = "threesome_drop5";
+	printf("%s\n", test);
+	save_sysctls(&inflight, &openfiles);
+	alloc3fds(&s, sv);
+	sendfd(sv[0], s);
+	close3(sv[0], sv[1], s);
+	test_sysctls(inflight, openfiles);
+
+	/*
+	 * threesome_drop6: close send sent receive
+	 */
+	test = "threesome_drop6";
+	printf("%s\n", test);
+	save_sysctls(&inflight, &openfiles);
+	alloc3fds(&s, sv);
+	close3(sv[0], s, sv[1]);
+	test_sysctls(inflight, openfiles);
+}
+
+/*
+ * Fivesome tests: create two socket pairs and a spare, send the spare over
+ * the first socket pair, then send the first socket pair over the second
+ * socket pair, and GC.  Do various closes at various points to exercise
+ * various cases.
+ */
+static void
+fivesome_nothing(void)
+{
+	int inflight, openfiles;
+	int spare, sva[2], svb[2];
+
+	test = "fivesome_nothing";
+	printf("%s\n", test);
+	save_sysctls(&inflight, &openfiles);
+	alloc5fds(&spare, sva, svb);
+	close5(spare, sva[0], sva[1], svb[0], svb[1]);
+	test_sysctls(inflight, openfiles);
+}
+
+static void
+fivesome_drop_work(const char *testname, int close_spare_after_send,
+    int close_sva_after_send)
+{
+	int inflight, openfiles;
+	int spare, sva[2], svb[2];
+
+	printf("%s\n", testname);
+	test = testname;
+	save_sysctls(&inflight, &openfiles);
+	alloc5fds(&spare, sva, svb);
+
+	/*
+	 * Send spare over sva.
+	 */
+	sendfd(sva[0], spare);
+	if (close_spare_after_send)
+		close(spare);
+
+	/*
+	 * Send sva over svb.
+	 */
+	sendfd(svb[0], sva[0]);
+	sendfd(svb[0], sva[1]);
+	if (close_sva_after_send)
+		close2(sva[0], sva[1]);
+
+	close2(svb[0], svb[1]);
+
+	if (!close_sva_after_send)
+		close2(sva[0], sva[1]);
+	if (!close_spare_after_send)
+		close(spare);
+
+	test_sysctls(inflight, openfiles);
+}
+
+static void
+fivesome_drop(void)
+{
+
+	fivesome_drop_work("fivesome_drop1", 0, 0);
+	fivesome_drop_work("fivesome_drop2", 0, 1);
+	fivesome_drop_work("fivesome_drop3", 1, 0);
+	fivesome_drop_work("fivesome_drop4", 1, 1);
+}
+
+/*
+ * Create a somewhat nasty dual-socket socket intended to upset the garbage
+ * collector if mark-and-sweep is wrong.
+ */
+static void
+complex_cycles(void)
+{
+	int inflight, openfiles;
+	int spare, sva[2], svb[2];
+
+	test = "complex_cycles";
+	printf("%s\n", test);
+	save_sysctls(&inflight, &openfiles);
+	alloc5fds(&spare, sva, svb);
+	sendfd(sva[0], svb[0]);
+	sendfd(sva[0], svb[1]);
+	sendfd(svb[0], sva[0]);
+	sendfd(svb[0], sva[1]);
+	sendfd(svb[0], spare);
+	sendfd(sva[0], spare);
+	close5(spare, sva[0], sva[1], svb[0], svb[1]);
+	test_sysctls(inflight, openfiles);
+}
+
+/*
+ * Listen sockets can also be passed over UNIX domain sockets, so test
+ * various cases, including ones where listen sockets have waiting sockets
+ * hanging off them...
+ */
+static void
+listen_nothing(void)
+{
+	struct sockaddr_un sun;
+	struct sockaddr_in sin;
+	int inflight, openfiles;
+	int s;
+
+	test = "listen_nothing_unp";
+	printf("%s\n", test);
+	bzero(&sun, sizeof(sun));
+	sun.sun_family = AF_LOCAL;
+	sun.sun_len = sizeof(sun);
+	snprintf(sun.sun_path, sizeof(sun.sun_path), "%s/%s", dpath, test);
+	save_sysctls(&inflight, &openfiles);
+	s = my_socket(PF_LOCAL, SOCK_STREAM, 0);
+	my_bind(s, (struct sockaddr *)&sun, sizeof(sun));
+	my_listen(s, -1);
+	close(s);
+	(void)unlink(sun.sun_path);
+	test_sysctls(inflight, openfiles);
+
+	test = "listen_nothing_inet";
+	printf("%s\n", test);
+	bzero(&sin, sizeof(sin));
+	sin.sin_family = AF_INET;
+	sin.sin_len = sizeof(sin);
+	sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
+	sin.sin_port = htons(0);
+	save_sysctls(&inflight, &openfiles);
+	s = my_socket(PF_INET, SOCK_STREAM, 0);
+	my_bind(s, (struct sockaddr *)&sin, sizeof(sin));
+	my_listen(s, -1);
+	close(s);
+	test_sysctls(inflight, openfiles);
+}
+
+/*
+ * Send a listen UDP socket over a UNIX domain socket.
+ *
+ * Send a listen TCP socket over a UNIX domain socket.
+ *
+ * Do each twice, with closing of the listen socket vs. socketpair in
+ * different orders.
+ */
+static void
+listen_drop(void)
+{
+	struct sockaddr_un sun;
+	struct sockaddr_in sin;
+	int inflight, openfiles;
+	int s, sv[2];
+
+	bzero(&sun, sizeof(sun));
+	sun.sun_family = AF_LOCAL;
+	sun.sun_len = sizeof(sun);
+
+	/*
+	 * Close listen socket first.
+	 */
+	test = "listen_drop_unp1";
+	printf("%s\n", test);
+	snprintf(sun.sun_path, sizeof(sun.sun_path), "%s/%s", dpath, test);
+	save_sysctls(&inflight, &openfiles);
+	s = my_socket(PF_LOCAL, SOCK_STREAM, 0);
+	my_bind(s, (struct sockaddr *)&sun, sizeof(sun));
+	my_listen(s, -1);
+	my_socketpair(sv);
+	sendfd(sv[0], s);
+	close3(s, sv[0], sv[1]);
+	test_sysctls(inflight, openfiles);
+
+	/*
+	 * Close socketpair first.
+	 */
+	test = "listen_drop_unp2";
+	printf("%s\n", test);
+	snprintf(sun.sun_path, sizeof(sun.sun_path), "%s/%s", dpath, test);
+	save_sysctls(&inflight, &openfiles);
+	s = my_socket(PF_LOCAL, SOCK_STREAM, 0);
+	my_bind(s, (struct sockaddr *)&sun, sizeof(sun));
+	my_listen(s, -1);
+	my_socketpair(sv);
+	sendfd(sv[0], s);
+	close3(sv[0], sv[1], s);
+	test_sysctls(inflight, openfiles);
+
+	sin.sin_family = AF_INET;
+	sin.sin_len = sizeof(sin);
+	sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
+	sin.sin_port = htons(0);
+
+	/*
+	 * Close listen socket first.
+	 */
+	test = "listen_drop_inet1";
+	printf("%s\n", test);
+	bzero(&sun, sizeof(sun));
+	save_sysctls(&inflight, &openfiles);
+	s = my_socket(PF_INET, SOCK_STREAM, 0);
+	my_bind(s, (struct sockaddr *)&sin, sizeof(sin));
+	my_listen(s, -1);
+	my_socketpair(sv);
+	sendfd(sv[0], s);
+	close3(s, sv[0], sv[1]);
+	test_sysctls(inflight, openfiles);
+
+	/*
+	 * Close socketpair first.
+	 */
+	test = "listen_drop_inet2";
+	printf("%s\n", test);
+	bzero(&sun, sizeof(sun));
+	save_sysctls(&inflight, &openfiles);
+	s = my_socket(PF_INET, SOCK_STREAM, 0);
+	my_bind(s, (struct sockaddr *)&sin, sizeof(sin));
+	my_listen(s, -1);
+	my_socketpair(sv);
+	sendfd(sv[0], s);
+	close3(sv[0], sv[1], s);
+	test_sysctls(inflight, openfiles);
+}
+
+/*
+ * Up things a notch with listen sockets: add connections that can be
+ * accepted to the listen queues.
+ */
+static void
+listen_connect_nothing(void)
+{
+	struct sockaddr_in sin;
+	int slisten, sconnect, sv[2];
+	int inflight, openfiles;
+	socklen_t len;
+
+	test = "listen_connect_nothing";
+	printf("%s\n", test);
+	save_sysctls(&inflight, &openfiles);
+
+	slisten = my_socket(PF_INET, SOCK_STREAM, 0);
+	my_bind(slisten, (struct sockaddr *)&sin, sizeof(sin));
+	my_listen(slisten, -1);
+
+	my_socketpair(sv);
+
+	len = sizeof(sin);
+	my_getsockname(slisten, (struct sockaddr *)&sin, &len);
+
+	sconnect = my_socket(PF_INET, SOCK_STREAM, 0);
+	setnonblock(sconnect);
+	my_connect(sconnect, (struct sockaddr *)&sin, len);
+
+	sleep(1);
+
+	close4(slisten, sconnect, sv[0], sv[1]);
+
+	test_sysctls(inflight, openfiles);
+}
+
+static void
+listen_connect_drop(void)
+{
+	struct sockaddr_in sin;
+	int slisten, sconnect, sv[2];
+	int inflight, openfiles;
+	socklen_t len;
+
+	test = "listen_connect_drop";
+	printf("%s\n", test);
+	save_sysctls(&inflight, &openfiles);
+
+	slisten = my_socket(PF_INET, SOCK_STREAM, 0);
+	my_bind(slisten, (struct sockaddr *)&sin, sizeof(sin));
+	my_listen(slisten, -1);
+
+	my_socketpair(sv);
+
+	len = sizeof(sin);
+	my_getsockname(slisten, (struct sockaddr *)&sin, &len);
+
+	sconnect = my_socket(PF_INET, SOCK_STREAM, 0);
+	setnonblock(sconnect);
+	my_connect(sconnect, (struct sockaddr *)&sin, len);
+
+	sleep(1);
+	sendfd(sv[0], slisten);
+	close3(slisten, sv[0], sv[1]);
+	sleep(1);
+	close(sconnect);
+
+	test_sysctls(inflight, openfiles);
+}
+
+#define	RMDIR	"rm -Rf "
+int
+main(int argc, char *argv[])
+{
+	char cmd[sizeof(RMDIR) + PATH_MAX];
+	int serrno;
+	pid_t pid;
+
+	strlcpy(dpath, "/tmp/unpgc.XXXXXXXX", sizeof(dpath));
+	if (mkdtemp(dpath) == NULL)
+		err(-1, "mkdtemp");
+
+	/*
+	 * Set up a parent process to GC temporary storage when we're done.
+	 */
+	pid = fork();
+	if (pid < 0) {
+		serrno = errno;
+		(void)rmdir(dpath);
+		errno = serrno;
+		err(-1, "fork");
+	}
+	if (pid > 0) {
+		signal(SIGINT, SIG_IGN);
+		while (waitpid(pid, NULL, 0) != pid);
+		snprintf(cmd, sizeof(cmd), "%s %s", RMDIR, dpath);
+		(void)system(cmd);
+		exit(0);
+	}
+
+	printf("Start: inflight %d open %d\n", getinflight(),
+	    getopenfiles());
+
+	twosome_nothing();
+	twosome_drop();
+
+	threesome_nothing();
+	threesome_drop();
+
+	fivesome_nothing();
+	fivesome_drop();
+
+	complex_cycles();
+
+	listen_nothing();
+	listen_drop();
+
+	listen_connect_nothing();
+	listen_connect_drop();
+
+	printf("Finish: inflight %d open %d\n", getinflight(),
+	    getopenfiles());
+	return (0);
+}