zdtm: add test cases for shared sturct file-s

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>

test/zdtm.sh

@@ -14,6 +14,7 @@ zdtm/live/static/write_read00
 zdtm/live/static/write_read01
 zdtm/live/static/write_read02
 zdtm/live/static/wait00
+zdtm/live/static/file_shared
 zdtm/live/streaming/pipe_loop00
 zdtm/live/streaming/pipe_shared00
 zdtm/live/transition/file_read"

test/zdtm/live/static/Makefile

@@ -44,6 +44,7 @@ TST_FILE	=	\
 		fifo_wronly	\
 		unlink_fifo	\
 		unlink_fifo_wronly	\
+		file_shared	\
 
 TST_DIR		=	\
 		cwd00		\

test/zdtm/live/static/file_shared.c

+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/wait.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <stdio.h>
+
+#include "zdtmtst.h"
+#define OFFSET 1000
+
+const char *test_doc	= "Check shared struct file-s";
+const char *test_author	= "Andrey Vagin <xemul@parallels.com>";
+
+char *filename;
+TEST_OPTION(filename, string, "file name", 1);
+
+int main(int argc, char **argv)
+{
+	pid_t pid;
+	int fd, ret, status;
+	off_t off;
+
+	test_init(argc, argv);
+
+	fd = open(filename, O_RDWR | O_CREAT);
+	if (fd == -1)
+		return 1;
+
+	fd = dup(fd);
+	if (fd < 0)
+		return 1;
+
+	test_daemon();
+
+	pid = test_fork();
+
+	if (pid == -1)
+		return 1;
+	else if (pid) {
+		test_waitsig();
+		off = lseek(fd, OFFSET, SEEK_SET);
+		if (off == (off_t) -1)
+			return 1;
+
+		ret = kill(pid, SIGTERM);
+		if (ret == -1) {
+			err("kill() failed: %m");
+		}
+
+		ret = wait(&status);
+		if (ret == -1) {
+			err("wait() failed: %m");
+			return 1;
+		}
+
+		if (!WIFEXITED(status) || WEXITSTATUS(status)) {
+			fail("Child exited with non-zero status");
+			return 1;
+		}
+	} else {
+		test_waitsig();
+		off = lseek(fd, 0, SEEK_CUR);
+		if (off != OFFSET) {
+			fail("offset should be %d insted of %d\n");
+			return 1;
+		}
+		return 0;
+	}
+
+	pass();
+
+	return 0;
+}