Post on the error handler in the Directory API when errors are encountered.

runtime/bin/directory_posix.cc

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include <dirent.h>
 #include <errno.h>
 #include <libgen.h>
 #include <string.h>
 #include <sys/param.h>
 #include <sys/stat.h>
@@ skipping 69 matching lines @@
                               PATH_MAX - path_length,
                               "%s",
                               file_name);
     ASSERT(written == strlen(file_name));
     Dart_Handle name = Dart_NewString(path);
     Dart_Post(file_port, name);
   }
 }
 
 
+static void PostError(Dart_Port error_port,
+                      const char* prefix,
+                      const char* suffix,
+                      int error_code) {
+  if (error_port != 0) {
+    // Extract the errno string.
+    static int kBufferSize = 1024;
+    char* error_buffer = static_cast<char*>(malloc(kBufferSize));
+    error_buffer[0] = '\0';
+    char* error_str = strerror_r(error_code, error_buffer, kBufferSize);
+    // Compose the error message from the parts.
+    int error_message_size =
+        strlen(prefix) + strlen(suffix) + strlen(error_str) + 3;
+    char* message = static_cast<char*>(malloc(error_message_size + 1));
+    int written = snprintf(message,
+                           error_message_size + 1,
+                           "%s%s (%s)",
+                           prefix,
+                           suffix,
+                           error_str);
+    ASSERT(written == error_message_size);
+    free(error_buffer);
+    Dart_Post(error_port, Dart_NewString(message));
+    free(message);
+  }
+}
+
+
 static bool ListRecursively(const char* dir_name,
                             bool recursive,
                             Dart_Port dir_port,
                             Dart_Port file_port,
                             Dart_Port done_port,
                             Dart_Port error_port) {
   DIR* dir_pointer = opendir(dir_name);
   if (dir_pointer == NULL) {
-    // TODO(ager): post something on the error port.
+    PostError(error_port, "Directory listing failed for: ", dir_name, errno);
     return false;
   }
 
   // Compute full path for the directory currently being listed.
   char *path = static_cast<char*>(malloc(PATH_MAX));
   ASSERT(path != NULL);
   int path_length = 0;
   ComputeFullPath(dir_name, path, &path_length);
 
   // Iterated the directory and post the directories and files to the
   // ports.
   int success = 0;
-  bool completed = true;
+  bool listing_error = false;
   dirent entry;
   dirent* result;
   while ((success = readdir_r(dir_pointer, &entry, &result)) == 0 &&
-         result != NULL) {
+         result != NULL &&
+         !listing_error) {
     switch (entry.d_type) {
       case DT_DIR:
-        completed = completed && HandleDir(entry.d_name,
-                                           path,
-                                           path_length,
-                                           recursive,
-                                           dir_port,
-                                           file_port,
-                                           done_port,
-                                           error_port);
+        listing_error = listing_error || !HandleDir(entry.d_name,
+                                                    path,
+                                                    path_length,
+                                                    recursive,
+                                                    dir_port,
+                                                    file_port,
+                                                    done_port,
+                                                    error_port);
         break;
       case DT_REG:
         HandleFile(entry.d_name, path, path_length, file_port);
         break;
       case DT_UNKNOWN: {
         // On some file systems the entry type is not determined by
         // readdir_r. For those we use lstat to determine the entry
         // type.
         struct stat entry_info;
         size_t written = snprintf(path + path_length,
                                   PATH_MAX - path_length,
                                   "%s",
                                   entry.d_name);
         ASSERT(written == strlen(entry.d_name));
         int lstat_success = lstat(path, &entry_info);
-        if (lstat_success != 0) {
-          completed = false;
+        if (lstat_success == -1) {
+          listing_error = true;
+          PostError(error_port, "Directory listing failed for: ", path, errno);
           break;
         }
         if ((entry_info.st_mode & S_IFMT) == S_IFDIR) {
-          HandleDir(entry.d_name,
-                    path,
-                    path_length,
-                    recursive,
-                    dir_port,
-                    file_port,
-                    done_port,
-                    error_port);
+          listing_error = listing_error || !HandleDir(entry.d_name,
+                                                      path,
+                                                      path_length,
+                                                      recursive,
+                                                      dir_port,
+                                                      file_port,
+                                                      done_port,
+                                                      error_port);
         } else if ((entry_info.st_mode & S_IFMT) == S_IFREG) {
           HandleFile(entry.d_name, path, path_length, file_port);
         }
         break;
       }
       default:
         break;
     }
   }
-  completed = completed && (success == 0);
 
-  // TODO(ager): Post on error port if closing fails.
-  closedir(dir_pointer);
+  if (success != 0) {
+    listing_error = true;
+    PostError(error_port, "Directory listing failed", "", success);
+  }
+
+  if (closedir(dir_pointer) == -1) {
+    PostError(error_port, "Failed to close directory", "", errno);
+  }
   free(path);
 
-  return completed;
+  return !listing_error;
 }
 
 
 void Directory::List(const char* dir_name,
                      bool recursive,
                      Dart_Port dir_port,
                      Dart_Port file_port,
                      Dart_Port done_port,
                      Dart_Port error_port) {
   bool completed = ListRecursively(dir_name,
@@ skipping 41 matching lines @@
 bool Directory::Create(const char* dir_name) {
   // Create the directory with the permissions specified by the
   // process umask.
   return (mkdir(dir_name, 0777) == 0);
 }
 
 
 bool Directory::Delete(const char* dir_name) {
   return (rmdir(dir_name) == 0);
 }