4 files changed, 766 insertions, 0 deletions

diff --git a/tools/testing/selftests/net/af_unix/Makefile b/tools/testing/selftests/net/af_unix/Makefile
new file mode 100644
index 000000000..1e4b397ce
--- /dev/null
+++ b/tools/testing/selftests/net/af_unix/Makefile
@@ -0,0 +1,3 @@
+TEST_GEN_PROGS := diag_uid test_unix_oob unix_connect
+
+include ../../lib.mk
diff --git a/tools/testing/selftests/net/af_unix/diag_uid.c b/tools/testing/selftests/net/af_unix/diag_uid.c
new file mode 100644
index 000000000..79a3dd755
--- /dev/null
+++ b/tools/testing/selftests/net/af_unix/diag_uid.c
@@ -0,0 +1,177 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright Amazon.com Inc. or its affiliates. */
+
+#define _GNU_SOURCE
+#include <sched.h>
+
+#include <unistd.h>
+#include <linux/netlink.h>
+#include <linux/rtnetlink.h>
+#include <linux/sock_diag.h>
+#include <linux/unix_diag.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/un.h>
+
+#include "../../kselftest_harness.h"
+
+FIXTURE(diag_uid)
+{
+	int netlink_fd;
+	int unix_fd;
+	__u32 inode;
+	__u64 cookie;
+};
+
+FIXTURE_VARIANT(diag_uid)
+{
+	int unshare;
+	int udiag_show;
+};
+
+FIXTURE_VARIANT_ADD(diag_uid, uid)
+{
+	.unshare = 0,
+	.udiag_show = UDIAG_SHOW_UID
+};
+
+FIXTURE_VARIANT_ADD(diag_uid, uid_unshare)
+{
+	.unshare = CLONE_NEWUSER,
+	.udiag_show = UDIAG_SHOW_UID
+};
+
+FIXTURE_SETUP(diag_uid)
+{
+	struct stat file_stat;
+	socklen_t optlen;
+	int ret;
+
+	if (variant->unshare)
+		ASSERT_EQ(unshare(variant->unshare), 0);
+
+	self->netlink_fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_SOCK_DIAG);
+	ASSERT_NE(self->netlink_fd, -1);
+
+	self->unix_fd = socket(AF_UNIX, SOCK_STREAM, 0);
+	ASSERT_NE(self->unix_fd, -1);
+
+	ret = fstat(self->unix_fd, &file_stat);
+	ASSERT_EQ(ret, 0);
+
+	self->inode = file_stat.st_ino;
+
+	optlen = sizeof(self->cookie);
+	ret = getsockopt(self->unix_fd, SOL_SOCKET, SO_COOKIE, &self->cookie, &optlen);
+	ASSERT_EQ(ret, 0);
+}
+
+FIXTURE_TEARDOWN(diag_uid)
+{
+	close(self->netlink_fd);
+	close(self->unix_fd);
+}
+
+int send_request(struct __test_metadata *_metadata,
+		 FIXTURE_DATA(diag_uid) *self,
+		 const FIXTURE_VARIANT(diag_uid) *variant)
+{
+	struct {
+		struct nlmsghdr nlh;
+		struct unix_diag_req udr;
+	} req = {
+		.nlh = {
+			.nlmsg_len = sizeof(req),
+			.nlmsg_type = SOCK_DIAG_BY_FAMILY,
+			.nlmsg_flags = NLM_F_REQUEST
+		},
+		.udr = {
+			.sdiag_family = AF_UNIX,
+			.udiag_ino = self->inode,
+			.udiag_cookie = {
+				(__u32)self->cookie,
+				(__u32)(self->cookie >> 32)
+			},
+			.udiag_show = variant->udiag_show
+		}
+	};
+	struct sockaddr_nl nladdr = {
+		.nl_family = AF_NETLINK
+	};
+	struct iovec iov = {
+		.iov_base = &req,
+		.iov_len = sizeof(req)
+	};
+	struct msghdr msg = {
+		.msg_name = &nladdr,
+		.msg_namelen = sizeof(nladdr),
+		.msg_iov = &iov,
+		.msg_iovlen = 1
+	};
+
+	return sendmsg(self->netlink_fd, &msg, 0);
+}
+
+void render_response(struct __test_metadata *_metadata,
+		     struct unix_diag_req *udr, __u32 len)
+{
+	unsigned int rta_len = len - NLMSG_LENGTH(sizeof(*udr));
+	struct rtattr *attr;
+	uid_t uid;
+
+	ASSERT_GT(len, sizeof(*udr));
+	ASSERT_EQ(udr->sdiag_family, AF_UNIX);
+
+	attr = (struct rtattr *)(udr + 1);
+	ASSERT_NE(RTA_OK(attr, rta_len), 0);
+	ASSERT_EQ(attr->rta_type, UNIX_DIAG_UID);
+
+	uid = *(uid_t *)RTA_DATA(attr);
+	ASSERT_EQ(uid, getuid());
+}
+
+void receive_response(struct __test_metadata *_metadata,
+		      FIXTURE_DATA(diag_uid) *self)
+{
+	long buf[8192 / sizeof(long)];
+	struct sockaddr_nl nladdr = {
+		.nl_family = AF_NETLINK
+	};
+	struct iovec iov = {
+		.iov_base = buf,
+		.iov_len = sizeof(buf)
+	};
+	struct msghdr msg = {
+		.msg_name = &nladdr,
+		.msg_namelen = sizeof(nladdr),
+		.msg_iov = &iov,
+		.msg_iovlen = 1
+	};
+	struct nlmsghdr *nlh;
+	int ret;
+
+	ret = recvmsg(self->netlink_fd, &msg, 0);
+	ASSERT_GT(ret, 0);
+
+	nlh = (struct nlmsghdr *)buf;
+	ASSERT_NE(NLMSG_OK(nlh, ret), 0);
+	ASSERT_EQ(nlh->nlmsg_type, SOCK_DIAG_BY_FAMILY);
+
+	render_response(_metadata, NLMSG_DATA(nlh), nlh->nlmsg_len);
+
+	nlh = NLMSG_NEXT(nlh, ret);
+	ASSERT_EQ(NLMSG_OK(nlh, ret), 0);
+}
+
+TEST_F(diag_uid, 1)
+{
+	int ret;
+
+	ret = send_request(_metadata, self, variant);
+	ASSERT_GT(ret, 0);
+
+	receive_response(_metadata, self);
+}
+
+TEST_HARNESS_MAIN
diff --git a/tools/testing/selftests/net/af_unix/test_unix_oob.c b/tools/testing/selftests/net/af_unix/test_unix_oob.c
new file mode 100644
index 000000000..532459a15
--- /dev/null
+++ b/tools/testing/selftests/net/af_unix/test_unix_oob.c
@@ -0,0 +1,438 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+#include <unistd.h>
+#include <string.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <errno.h>
+#include <netinet/tcp.h>
+#include <sys/un.h>
+#include <sys/signal.h>
+#include <sys/poll.h>
+
+static int pipefd[2];
+static int signal_recvd;
+static pid_t producer_id;
+static char sock_name[32];
+
+static void sig_hand(int sn, siginfo_t *si, void *p)
+{
+	signal_recvd = sn;
+}
+
+static int set_sig_handler(int signal)
+{
+	struct sigaction sa;
+
+	sa.sa_sigaction = sig_hand;
+	sigemptyset(&sa.sa_mask);
+	sa.sa_flags = SA_SIGINFO | SA_RESTART;
+
+	return sigaction(signal, &sa, NULL);
+}
+
+static void set_filemode(int fd, int set)
+{
+	int flags = fcntl(fd, F_GETFL, 0);
+
+	if (set)
+		flags &= ~O_NONBLOCK;
+	else
+		flags |= O_NONBLOCK;
+	fcntl(fd, F_SETFL, flags);
+}
+
+static void signal_producer(int fd)
+{
+	char cmd;
+
+	cmd = 'S';
+	write(fd, &cmd, sizeof(cmd));
+}
+
+static void wait_for_signal(int fd)
+{
+	char buf[5];
+
+	read(fd, buf, 5);
+}
+
+static void die(int status)
+{
+	fflush(NULL);
+	unlink(sock_name);
+	kill(producer_id, SIGTERM);
+	exit(status);
+}
+
+int is_sioctatmark(int fd)
+{
+	int ans = -1;
+
+	if (ioctl(fd, SIOCATMARK, &ans, sizeof(ans)) < 0) {
+#ifdef DEBUG
+		perror("SIOCATMARK Failed");
+#endif
+	}
+	return ans;
+}
+
+void read_oob(int fd, char *c)
+{
+
+	*c = ' ';
+	if (recv(fd, c, sizeof(*c), MSG_OOB) < 0) {
+#ifdef DEBUG
+		perror("Reading MSG_OOB Failed");
+#endif
+	}
+}
+
+int read_data(int pfd, char *buf, int size)
+{
+	int len = 0;
+
+	memset(buf, size, '0');
+	len = read(pfd, buf, size);
+#ifdef DEBUG
+	if (len < 0)
+		perror("read failed");
+#endif
+	return len;
+}
+
+static void wait_for_data(int pfd, int event)
+{
+	struct pollfd pfds[1];
+
+	pfds[0].fd = pfd;
+	pfds[0].events = event;
+	poll(pfds, 1, -1);
+}
+
+void producer(struct sockaddr_un *consumer_addr)
+{
+	int cfd;
+	char buf[64];
+	int i;
+
+	memset(buf, 'x', sizeof(buf));
+	cfd = socket(AF_UNIX, SOCK_STREAM, 0);
+
+	wait_for_signal(pipefd[0]);
+	if (connect(cfd, (struct sockaddr *)consumer_addr,
+		     sizeof(*consumer_addr)) != 0) {
+		perror("Connect failed");
+		kill(0, SIGTERM);
+		exit(1);
+	}
+
+	for (i = 0; i < 2; i++) {
+		/* Test 1: Test for SIGURG and OOB */
+		wait_for_signal(pipefd[0]);
+		memset(buf, 'x', sizeof(buf));
+		buf[63] = '@';
+		send(cfd, buf, sizeof(buf), MSG_OOB);
+
+		wait_for_signal(pipefd[0]);
+
+		/* Test 2: Test for OOB being overwitten */
+		memset(buf, 'x', sizeof(buf));
+		buf[63] = '%';
+		send(cfd, buf, sizeof(buf), MSG_OOB);
+
+		memset(buf, 'x', sizeof(buf));
+		buf[63] = '#';
+		send(cfd, buf, sizeof(buf), MSG_OOB);
+
+		wait_for_signal(pipefd[0]);
+
+		/* Test 3: Test for SIOCATMARK */
+		memset(buf, 'x', sizeof(buf));
+		buf[63] = '@';
+		send(cfd, buf, sizeof(buf), MSG_OOB);
+
+		memset(buf, 'x', sizeof(buf));
+		buf[63] = '%';
+		send(cfd, buf, sizeof(buf), MSG_OOB);
+
+		memset(buf, 'x', sizeof(buf));
+		send(cfd, buf, sizeof(buf), 0);
+
+		wait_for_signal(pipefd[0]);
+
+		/* Test 4: Test for 1byte OOB msg */
+		memset(buf, 'x', sizeof(buf));
+		buf[0] = '@';
+		send(cfd, buf, 1, MSG_OOB);
+	}
+}
+
+int
+main(int argc, char **argv)
+{
+	int lfd, pfd;
+	struct sockaddr_un consumer_addr, paddr;
+	socklen_t len = sizeof(consumer_addr);
+	char buf[1024];
+	int on = 0;
+	char oob;
+	int flags;
+	int atmark;
+	char *tmp_file;
+
+	lfd = socket(AF_UNIX, SOCK_STREAM, 0);
+	memset(&consumer_addr, 0, sizeof(consumer_addr));
+	consumer_addr.sun_family = AF_UNIX;
+	sprintf(sock_name, "unix_oob_%d", getpid());
+	unlink(sock_name);
+	strcpy(consumer_addr.sun_path, sock_name);
+
+	if ((bind(lfd, (struct sockaddr *)&consumer_addr,
+		  sizeof(consumer_addr))) != 0) {
+		perror("socket bind failed");
+		exit(1);
+	}
+
+	pipe(pipefd);
+
+	listen(lfd, 1);
+
+	producer_id = fork();
+	if (producer_id == 0) {
+		producer(&consumer_addr);
+		exit(0);
+	}
+
+	set_sig_handler(SIGURG);
+	signal_producer(pipefd[1]);
+
+	pfd = accept(lfd, (struct sockaddr *) &paddr, &len);
+	fcntl(pfd, F_SETOWN, getpid());
+
+	signal_recvd = 0;
+	signal_producer(pipefd[1]);
+
+	/* Test 1:
+	 * veriyf that SIGURG is
+	 * delivered, 63 bytes are
+	 * read, oob is '@', and POLLPRI works.
+	 */
+	wait_for_data(pfd, POLLPRI);
+	read_oob(pfd, &oob);
+	len = read_data(pfd, buf, 1024);
+	if (!signal_recvd || len != 63 || oob != '@') {
+		fprintf(stderr, "Test 1 failed sigurg %d len %d %c\n",
+			 signal_recvd, len, oob);
+			die(1);
+	}
+
+	signal_recvd = 0;
+	signal_producer(pipefd[1]);
+
+	/* Test 2:
+	 * Verify that the first OOB is over written by
+	 * the 2nd one and the first OOB is returned as
+	 * part of the read, and sigurg is received.
+	 */
+	wait_for_data(pfd, POLLIN | POLLPRI);
+	len = 0;
+	while (len < 70)
+		len = recv(pfd, buf, 1024, MSG_PEEK);
+	len = read_data(pfd, buf, 1024);
+	read_oob(pfd, &oob);
+	if (!signal_recvd || len != 127 || oob != '#') {
+		fprintf(stderr, "Test 2 failed, sigurg %d len %d OOB %c\n",
+		signal_recvd, len, oob);
+		die(1);
+	}
+
+	signal_recvd = 0;
+	signal_producer(pipefd[1]);
+
+	/* Test 3:
+	 * verify that 2nd oob over writes
+	 * the first one and read breaks at
+	 * oob boundary returning 127 bytes
+	 * and sigurg is received and atmark
+	 * is set.
+	 * oob is '%' and second read returns
+	 * 64 bytes.
+	 */
+	len = 0;
+	wait_for_data(pfd, POLLIN | POLLPRI);
+	while (len < 150)
+		len = recv(pfd, buf, 1024, MSG_PEEK);
+	len = read_data(pfd, buf, 1024);
+	atmark = is_sioctatmark(pfd);
+	read_oob(pfd, &oob);
+
+	if (!signal_recvd || len != 127 || oob != '%' || atmark != 1) {
+		fprintf(stderr,
+			"Test 3 failed, sigurg %d len %d OOB %c atmark %d\n",
+			signal_recvd, len, oob, atmark);
+		die(1);
+	}
+
+	signal_recvd = 0;
+
+	len = read_data(pfd, buf, 1024);
+	if (len != 64) {
+		fprintf(stderr, "Test 3.1 failed, sigurg %d len %d OOB %c\n",
+			signal_recvd, len, oob);
+		die(1);
+	}
+
+	signal_recvd = 0;
+	signal_producer(pipefd[1]);
+
+	/* Test 4:
+	 * verify that a single byte
+	 * oob message is delivered.
+	 * set non blocking mode and
+	 * check proper error is
+	 * returned and sigurg is
+	 * received and correct
+	 * oob is read.
+	 */
+
+	set_filemode(pfd, 0);
+
+	wait_for_data(pfd, POLLIN | POLLPRI);
+	len = read_data(pfd, buf, 1024);
+	if ((len == -1) && (errno == 11))
+		len = 0;
+
+	read_oob(pfd, &oob);
+
+	if (!signal_recvd || len != 0 || oob != '@') {
+		fprintf(stderr, "Test 4 failed, sigurg %d len %d OOB %c\n",
+			 signal_recvd, len, oob);
+		die(1);
+	}
+
+	set_filemode(pfd, 1);
+
+	/* Inline Testing */
+
+	on = 1;
+	if (setsockopt(pfd, SOL_SOCKET, SO_OOBINLINE, &on, sizeof(on))) {
+		perror("SO_OOBINLINE");
+		die(1);
+	}
+
+	signal_recvd = 0;
+	signal_producer(pipefd[1]);
+
+	/* Test 1 -- Inline:
+	 * Check that SIGURG is
+	 * delivered and 63 bytes are
+	 * read and oob is '@'
+	 */
+
+	wait_for_data(pfd, POLLIN | POLLPRI);
+	len = read_data(pfd, buf, 1024);
+
+	if (!signal_recvd || len != 63) {
+		fprintf(stderr, "Test 1 Inline failed, sigurg %d len %d\n",
+			signal_recvd, len);
+		die(1);
+	}
+
+	len = read_data(pfd, buf, 1024);
+
+	if (len != 1) {
+		fprintf(stderr,
+			 "Test 1.1 Inline failed, sigurg %d len %d oob %c\n",
+			 signal_recvd, len, oob);
+		die(1);
+	}
+
+	signal_recvd = 0;
+	signal_producer(pipefd[1]);
+
+	/* Test 2 -- Inline:
+	 * Verify that the first OOB is over written by
+	 * the 2nd one and read breaks correctly on
+	 * 2nd OOB boundary with the first OOB returned as
+	 * part of the read, and sigurg is delivered and
+	 * siocatmark returns true.
+	 * next read returns one byte, the oob byte
+	 * and siocatmark returns false.
+	 */
+	len = 0;
+	wait_for_data(pfd, POLLIN | POLLPRI);
+	while (len < 70)
+		len = recv(pfd, buf, 1024, MSG_PEEK);
+	len = read_data(pfd, buf, 1024);
+	atmark = is_sioctatmark(pfd);
+	if (len != 127 || atmark != 1 || !signal_recvd) {
+		fprintf(stderr, "Test 2 Inline failed, len %d atmark %d\n",
+			 len, atmark);
+		die(1);
+	}
+
+	len = read_data(pfd, buf, 1024);
+	atmark = is_sioctatmark(pfd);
+	if (len != 1 || buf[0] != '#' || atmark == 1) {
+		fprintf(stderr, "Test 2.1 Inline failed, len %d data %c atmark %d\n",
+			len, buf[0], atmark);
+		die(1);
+	}
+
+	signal_recvd = 0;
+	signal_producer(pipefd[1]);
+
+	/* Test 3 -- Inline:
+	 * verify that 2nd oob over writes
+	 * the first one and read breaks at
+	 * oob boundary returning 127 bytes
+	 * and sigurg is received and siocatmark
+	 * is true after the read.
+	 * subsequent read returns 65 bytes
+	 * because of oob which should be '%'.
+	 */
+	len = 0;
+	wait_for_data(pfd, POLLIN | POLLPRI);
+	while (len < 126)
+		len = recv(pfd, buf, 1024, MSG_PEEK);
+	len = read_data(pfd, buf, 1024);
+	atmark = is_sioctatmark(pfd);
+	if (!signal_recvd || len != 127 || !atmark) {
+		fprintf(stderr,
+			 "Test 3 Inline failed, sigurg %d len %d data %c\n",
+			 signal_recvd, len, buf[0]);
+		die(1);
+	}
+
+	len = read_data(pfd, buf, 1024);
+	atmark = is_sioctatmark(pfd);
+	if (len != 65 || buf[0] != '%' || atmark != 0) {
+		fprintf(stderr,
+			 "Test 3.1 Inline failed, len %d oob %c atmark %d\n",
+			 len, buf[0], atmark);
+		die(1);
+	}
+
+	signal_recvd = 0;
+	signal_producer(pipefd[1]);
+
+	/* Test 4 -- Inline:
+	 * verify that a single
+	 * byte oob message is delivered
+	 * and read returns one byte, the oob
+	 * byte and sigurg is received
+	 */
+	wait_for_data(pfd, POLLIN | POLLPRI);
+	len = read_data(pfd, buf, 1024);
+	if (!signal_recvd || len != 1 || buf[0] != '@') {
+		fprintf(stderr,
+			"Test 4 Inline failed, signal %d len %d data %c\n",
+		signal_recvd, len, buf[0]);
+		die(1);
+	}
+	die(0);
+}
diff --git a/tools/testing/selftests/net/af_unix/unix_connect.c b/tools/testing/selftests/net/af_unix/unix_connect.c
new file mode 100644
index 000000000..d799fd8f5
--- /dev/null
+++ b/tools/testing/selftests/net/af_unix/unix_connect.c
@@ -0,0 +1,148 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#define _GNU_SOURCE
+#include <sched.h>
+
+#include <stddef.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#include <sys/socket.h>
+#include <sys/un.h>
+
+#include "../../kselftest_harness.h"
+
+FIXTURE(unix_connect)
+{
+	int server, client;
+	int family;
+};
+
+FIXTURE_VARIANT(unix_connect)
+{
+	int type;
+	char sun_path[8];
+	int len;
+	int flags;
+	int err;
+};
+
+FIXTURE_VARIANT_ADD(unix_connect, stream_pathname)
+{
+	.type = SOCK_STREAM,
+	.sun_path = "test",
+	.len = 4 + 1,
+	.flags = 0,
+	.err = 0,
+};
+
+FIXTURE_VARIANT_ADD(unix_connect, stream_abstract)
+{
+	.type = SOCK_STREAM,
+	.sun_path = "\0test",
+	.len = 5,
+	.flags = 0,
+	.err = 0,
+};
+
+FIXTURE_VARIANT_ADD(unix_connect, stream_pathname_netns)
+{
+	.type = SOCK_STREAM,
+	.sun_path = "test",
+	.len = 4 + 1,
+	.flags = CLONE_NEWNET,
+	.err = 0,
+};
+
+FIXTURE_VARIANT_ADD(unix_connect, stream_abstract_netns)
+{
+	.type = SOCK_STREAM,
+	.sun_path = "\0test",
+	.len = 5,
+	.flags = CLONE_NEWNET,
+	.err = ECONNREFUSED,
+};
+
+FIXTURE_VARIANT_ADD(unix_connect, dgram_pathname)
+{
+	.type = SOCK_DGRAM,
+	.sun_path = "test",
+	.len = 4 + 1,
+	.flags = 0,
+	.err = 0,
+};
+
+FIXTURE_VARIANT_ADD(unix_connect, dgram_abstract)
+{
+	.type = SOCK_DGRAM,
+	.sun_path = "\0test",
+	.len = 5,
+	.flags = 0,
+	.err = 0,
+};
+
+FIXTURE_VARIANT_ADD(unix_connect, dgram_pathname_netns)
+{
+	.type = SOCK_DGRAM,
+	.sun_path = "test",
+	.len = 4 + 1,
+	.flags = CLONE_NEWNET,
+	.err = 0,
+};
+
+FIXTURE_VARIANT_ADD(unix_connect, dgram_abstract_netns)
+{
+	.type = SOCK_DGRAM,
+	.sun_path = "\0test",
+	.len = 5,
+	.flags = CLONE_NEWNET,
+	.err = ECONNREFUSED,
+};
+
+FIXTURE_SETUP(unix_connect)
+{
+	self->family = AF_UNIX;
+}
+
+FIXTURE_TEARDOWN(unix_connect)
+{
+	close(self->server);
+	close(self->client);
+
+	if (variant->sun_path[0])
+		remove("test");
+}
+
+TEST_F(unix_connect, test)
+{
+	socklen_t addrlen;
+	struct sockaddr_un addr = {
+		.sun_family = self->family,
+	};
+	int err;
+
+	self->server = socket(self->family, variant->type, 0);
+	ASSERT_NE(-1, self->server);
+
+	addrlen = offsetof(struct sockaddr_un, sun_path) + variant->len;
+	memcpy(&addr.sun_path, variant->sun_path, variant->len);
+
+	err = bind(self->server, (struct sockaddr *)&addr, addrlen);
+	ASSERT_EQ(0, err);
+
+	if (variant->type == SOCK_STREAM) {
+		err = listen(self->server, 32);
+		ASSERT_EQ(0, err);
+	}
+
+	err = unshare(variant->flags);
+	ASSERT_EQ(0, err);
+
+	self->client = socket(self->family, variant->type, 0);
+	ASSERT_LT(0, self->client);
+
+	err = connect(self->client, (struct sockaddr *)&addr, addrlen);
+	ASSERT_EQ(variant->err, err == -1 ? errno : 0);
+}
+
+TEST_HARNESS_MAIN