zdtm: add test for socket buffer size locks

Just set all possible values 0-3 and chack if it persists.

Reviewed-by: Alexander Mikhalitsyn <alexander.mikhalitsyn@virtuozzo.com>
Signed-off-by: Pavel Tikhomirov <ptikhomirov@virtuozzo.com>

test/zdtm/static/Makefile

@@ -117,6 +117,7 @@ TST_NOFILE	:=				\
 		socket-linger			\
 		sock_opts00			\
 		sock_opts01			\
+		sock_opts02			\
 		sk-unix-unconn			\
 		ipc_namespace			\
 		selfexe00			\

test/zdtm/static/sock_opts02.c

@@ -0,0 +1,73 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+
+#include "zdtmtst.h"
+
+const char *test_doc = "Check that SO_BUF_LOCK option dumped";
+const char *test_author = "Pavel Tikhomirov <ptikhomirov@virtuozzo.com>";
+
+#ifndef SO_BUF_LOCK
+#define SO_BUF_LOCK 72
+#endif
+
+#define NSOCK 4
+
+int main(int argc, char **argv)
+{
+	int sock[NSOCK];
+	uint32_t val[NSOCK];
+	int ret, i;
+	int exit_code = 1;
+
+	test_init(argc, argv);
+
+	for (i = 0; i < NSOCK; i++) {
+		sock[i] = -1;
+		val[i] = i;
+	}
+
+	for (i = 0; i < NSOCK; i++) {
+		sock[i] = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
+		if (sock[i] < 0) {
+			pr_perror("can't create socket %d", i);
+			goto err;
+		}
+
+		ret = setsockopt(sock[i], SOL_SOCKET, SO_BUF_LOCK, &val[i], sizeof(val[i]));
+		if (ret < 0) {
+			pr_perror("can't set SO_BUF_LOCK (%u) on socket %d", val[i], i);
+			goto err;
+		}
+	}
+
+	test_daemon();
+	test_waitsig();
+
+	for (i = 0; i < NSOCK; i++) {
+		uint32_t tmp;
+		socklen_t len;
+
+		len = sizeof(tmp);
+		ret = getsockopt(sock[i], SOL_SOCKET, SO_BUF_LOCK, &tmp, &len);
+		if (ret < 0) {
+			pr_perror("can't get SO_BUF_LOCK from socket %d", i);
+			goto err;
+		}
+
+		if (tmp != val[i]) {
+			fail("SO_BUF_LOCK missmatch %u != %u", tmp, val[i]);
+			goto err;
+		}
+	}
+
+	pass();
+	exit_code = 0;
+err:
+	for (i = 0; i < NSOCK; i++)
+		close(sock[i]);
+
+	return exit_code;
+}

test/zdtm/static/sock_opts02.desc

@@ -0,0 +1 @@
+{'flags': 'suid', 'feature': 'sockopt_buf_lock'}