Squash commits for public release

test/kernel/fs/dirfile/main.c

@@ -0,0 +1,39 @@
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+char buf[512];
+
+int main(int argc, char** argv)
+{
+    int fd;
+
+    fd = open("dirfile", 0);
+    if (fd >= 0) {
+        TestErr("opened dirfile which does not exist");
+    }
+    fd = open("dirfile", O_CREAT);
+    if (fd < 0) {
+        TestErr("cannot create dirfile");
+    }
+    if (chdir("dirfile") == 0) {
+        TestErr("chdir dirfile succeeded");
+    }
+    if (unlink("dirfile") != 0) {
+        TestErr("unlink dirfile succeeded");
+    }
+
+    fd = open(".", O_RDWR);
+    if (fd >= 0) {
+        TestErr("open . for writing succeeded");
+    }
+    fd = open(".", O_RDONLY);
+    if (write(fd, "x", 1) > 0) {
+        TestErr("write . succeeded");
+    }
+    close(fd);
+
+    return 0;
+}