zdtm: check that data in unix dgram sockets are restored correctly

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

test/zdtm/live/static/Makefile

@@ -35,6 +35,7 @@ TST_NOFILE	=				\
 		socket_aio			\
 		socket_close_data		\
 		socket_snd_addr			\
+		socket_dgram_data		\
 		packet_sock			\
 		packet_sock_mmap		\
 		sock_filter			\

test/zdtm/live/static/socket_dgram_data.c

+#define _GNU_SOURCE
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+
+#include "zdtmtst.h"
+
+const char *test_doc	= "Check that data in dgram socket are restored correctly";
+const char *test_author	= "Andrew Vagin <avagin@openvz.org";
+
+#define SK_SRV "\0socket_snd_srv"
+
+#define MSG "hello"
+int main(int argc, char **argv)
+{
+	struct sockaddr_un addr;
+	unsigned int addrlen;
+	int srv, clnt1, clnt2, ret;
+	char buf[1024];
+
+	test_init(argc, argv);
+
+	srv = socket(PF_UNIX, SOCK_DGRAM | SOCK_NONBLOCK, 0);
+	if (srv < 0) {
+		err("socket");
+		return 1;
+	}
+	clnt1 = socket(PF_UNIX, SOCK_DGRAM | SOCK_NONBLOCK, 0);
+	if (clnt1 < 0) {
+		err("socket");
+		return 1;
+	}
+	clnt2 = socket(PF_UNIX, SOCK_DGRAM | SOCK_NONBLOCK, 0);
+	if (clnt2 < 0) {
+		err("socket");
+		return 1;
+	}
+
+	addr.sun_family = AF_UNIX;
+	memcpy(addr.sun_path, SK_SRV, sizeof(SK_SRV));
+	addrlen = sizeof(addr.sun_family) + sizeof(SK_SRV);
+
+	if (bind(srv, &addr, addrlen)) {
+		fail("bind\n");
+		exit(1);
+	}
+	if (connect(clnt1, &addr, addrlen)) {
+		fail("connect\n");
+		exit(1);
+	}
+	if (connect(clnt2, &addr, addrlen)) {
+		fail("connect\n");
+		exit(1);
+	}
+
+	if (write(clnt1, MSG, sizeof(MSG)) != sizeof(MSG)) {
+		err("write");
+		return 1;
+	}
+
+	test_daemon();
+	test_waitsig();
+
+	ret = read(srv, buf, sizeof(buf));
+	buf[ret > 0 ? ret : 0] = 0;
+	if (ret != sizeof(MSG)) {
+		fail("%d: %s", ret, buf);
+		return 1;
+	}
+
+	ret = read(srv, buf, sizeof(buf));
+	if (ret != -1 || errno != EAGAIN) {
+		fail("unexpected data: %d", ret);
+		return 1;
+	}
+
+	pass();
+	return 0;
+}