[NaCl SDK] nacl_io: Change default root filesystem type from passthroughfs to memfs

native_client_sdk/src/libraries/nacl_io/passthroughfs/real_node.cc

Index: native_client_sdk/src/libraries/nacl_io/passthroughfs/real_node.cc
diff --git a/native_client_sdk/src/libraries/nacl_io/passthroughfs/real_node.cc b/native_client_sdk/src/libraries/nacl_io/passthroughfs/real_node.cc
index 7f585f640c54b35c633801da9cbd46b08b436721..39f7a9105723f605a1923eb50a347159904a8edc 100644
--- a/native_client_sdk/src/libraries/nacl_io/passthroughfs/real_node.cc
+++ b/native_client_sdk/src/libraries/nacl_io/passthroughfs/real_node.cc
@@ -12,11 +12,13 @@
 #include "nacl_io/log.h"
 
 namespace nacl_io {
+
 RealNode::RealNode(Filesystem* filesystem, int real_fd, bool close_on_destroy)
   : Node(filesystem),
     real_fd_(real_fd),
     close_on_destroy_(close_on_destroy)
 {
+  GetStat(&stat_);
 }
 
 void RealNode::Destroy() {
@@ -89,22 +91,34 @@ Error RealNode::GetDents(size_t offs,
                          struct dirent* pdir,
                          size_t count,
                          int* out_bytes) {
-  size_t nread;
-  int err = _real_getdents(real_fd_, pdir, count, &nread);
-  if (err)
-    return err;
-  return nread;
+  size_t out_bytes_as_size_t;
+  Error rtn = _real_getdents(real_fd_, pdir, count, &out_bytes_as_size_t);
+  if (rtn == 0)
+    *out_bytes = out_bytes_as_size_t;
+  return rtn;
 }
 
+#ifndef S_UNSUP
+#define S_UNSUP S_IFMT
+#endif
+
 Error RealNode::GetStat(struct stat* stat) {
   int err = _real_fstat(real_fd_, stat);
   if (err)
     return err;
-  // On windows, fstat() of stdin/stdout/stderr returns all zeros
-  // for the permission bits. This can cause problems down the
-  // line.  For example, CanOpen() will fail.
+  // On windows, fstat() of stdin/stdout/stderr (when they are represented
+  // as char device or FIFO) returns all zeros for the mode bits. This can
+  // cause problems down the line.  For example, CanOpen() will fail.
+  // We also have to check for S_UNSUP because S_IFIFO is currently not
+  // reported by the windows sel_ldr.
   // TODO(sbc): Fix this within sel_ldr instead.
-  if (S_ISCHR(stat->st_mode) && (stat->st_mode & S_IRWXU) == 0)
+  if ((stat->st_mode & S_IRWXU) == 0) {
+    LOG_WARN("_real_fstat(%d) reported not access permissions: st_mode=O%o\n",
+        real_fd_, stat->st_mode);
+  }
+  if ((S_ISCHR(stat->st_mode)
+      || S_ISFIFO(stat->st_mode)
+      || (stat->st_mode & S_IFMT) == S_UNSUP) && (stat->st_mode & S_IRWXU) == 0)
     stat->st_mode |= S_IRWXU;
   return 0;
 }