zdtm: Extend file_shared test

Check for files with equal paths are handled"
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

test/zdtm/live/static/file_shared.c

@@ -8,6 +8,7 @@
 
 #include "zdtmtst.h"
 #define OFFSET 1000
+#define OFFSET2 500
 
 const char *test_doc	= "Check shared struct file-s";
 const char *test_author	= "Andrey Vagin <avagin@openvz.org>";
@@ -18,7 +19,7 @@ TEST_OPTION(filename, string, "file name", 1);
 int main(int argc, char **argv)
 {
 	pid_t pid;
-	int fd, ret, status;
+	int fd, fd2, fd3, ret, status;
 	off_t off;
 
 	test_init(argc, argv);
@@ -27,10 +28,14 @@ int main(int argc, char **argv)
 	if (fd == -1)
 		return 1;
 
-	fd = dup(fd);
+	fd2 = dup(fd);
 	if (fd < 0)
 		return 1;
 
+	fd3 = open(filename, O_RDWR | O_CREAT);
+	if (fd3 == -1)
+		return 1;
+
 	test_daemon();
 
 	pid = test_fork();
@@ -43,6 +48,10 @@ int main(int argc, char **argv)
 		if (off == (off_t) -1)
 			return 1;
 
+		off = lseek(fd3, OFFSET2, SEEK_SET);
+		if (off == (off_t) -1)
+			return 1;
+
 		ret = kill(pid, SIGTERM);
 		if (ret == -1) {
 			err("kill() failed: %m");
@@ -58,11 +67,31 @@ int main(int argc, char **argv)
 			fail("Child exited with non-zero status");
 			return 1;
 		}
+		off = lseek(fd2, 0, SEEK_CUR);
+		if (off != OFFSET) {
+			fail("offset1 fail\n");
+			return 1;
+		}
+		off = lseek(fd3, 0, SEEK_CUR);
+		if (off != OFFSET2) {
+			fail("offset2 fail\n");
+			return 1;
+		}
 	} else {
 		test_waitsig();
 		off = lseek(fd, 0, SEEK_CUR);
 		if (off != OFFSET) {
-			fail("offset should be %d insted of %d\n");
+			fail("offset3 fail\n");
+			return 1;
+		}
+		off = lseek(fd2, 0, SEEK_CUR);
+		if (off != OFFSET) {
+			fail("offset4 fail\n");
+			return 1;
+		}
+		off = lseek(fd3, 0, SEEK_CUR);
+		if (off != OFFSET2) {
+			fail("offset5 fail\n");
 			return 1;
 		}
 		return 0;