Skip O_TMPFILE test on Linux versions < 3.11

There it fails with EISDIR.

NEWS

@@ -1,3 +1,7 @@
+0.8.8 (UNRELEASED)
+------------------
+- Skip O_TMPFILE test on Linux versions < 3.11.
+
 0.8.7 (2014-09-19)
 ------------------
 - /umockdev-run/integration/input-evtest-evemu test: Be more liberal in parsing

tests/test-umockdev.c

@@ -30,6 +30,7 @@
 #include <sys/ioctl.h>
 #include <sys/socket.h>
 #include <sys/un.h>
+#include <sys/utsname.h>
 #include <linux/usbdevice_fs.h>
 #include <linux/input.h>
 
@@ -1000,6 +1001,7 @@ t_testbed_dev_access(UMockdevTestbedFixture * fixture, gconstpointer data)
     gchar *devdir, *devpath;
     int fd;
     char buf[100];
+    struct utsname uts;
 
     /* no mocked devices */
     g_assert_cmpint(g_open("/dev/wishyouwerehere", O_RDONLY, 0), ==, -1);
@@ -1067,13 +1069,19 @@ t_testbed_dev_access(UMockdevTestbedFixture * fixture, gconstpointer data)
         close(fd);
     }
 
-    /* open() with O_TMPFILE */
+    /* open() with O_TMPFILE (Linux >= 3.11) */
     errno = 0;
-    fd = g_open("/dev", O_TMPFILE|O_RDWR, 0644);
-    g_assert_cmpint(errno, ==, 0);
-    g_assert_cmpint(fd, >, 0);
-    g_assert_cmpint(write(fd, "hello", 5), ==, 5);
-    close(fd);
+    g_assert_cmpint(uname(&uts), ==, 0);
+
+    if (strncmp(uts.release, "3.11", 4) >= 0) {
+        fd = g_open("/dev", O_TMPFILE|O_RDWR, 0644);
+        g_assert_cmpint(errno, ==, 0);
+        g_assert_cmpint(fd, >, 0);
+        g_assert_cmpint(write(fd, "hello", 5), ==, 5);
+        close(fd);
+    } else {
+        g_printf("(Skipping O_TMPFILE test, Linux version %s too old) ", uts.release);
+    }
 
     g_free(devdir);
 }