Implemented File create API.

runtime/bin/file_macos.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 <errno.h>
 #include <fcntl.h>
 #include <sys/stat.h>
 #include <unistd.h>
 #include <libgen.h>
 #include <limits.h>
@@ skipping 74 matching lines @@
   if (position < 0) {
     // The file is not capable of seeking. Return an error.
     return -1;
   }
   off_t result = lseek(handle_->fd(), 0, SEEK_END);
   lseek(handle_->fd(), position, SEEK_SET);
   return result;
 }
 
 
-File* File::OpenFile(const char* name, bool writable) {
+File* File::Open(const char* name, bool writable) {
   int flags = O_RDONLY;
   if (writable) {
     flags = (O_RDWR | O_CREAT | O_TRUNC);
   }
   int fd = open(name, flags, 0666);
   if (fd < 0) {
     return NULL;
   }
   return new File(name, new FileHandle(fd));
 }
 
 
-bool File::FileExists(const char* name) {
+bool File::Exists(const char* name) {
   struct stat st;
   if (stat(name, &st) == 0) {
     return S_ISREG(st.st_mode);  // Deal with symlinks?
   } else {
     return false;
   }
 }
 
 
 bool File::IsAbsolutePath(const char* pathname) {
   return (pathname != NULL && pathname[0] == '/');
 }
 
 
+bool File::Create(const char* name) {
+  int fd = open(name, O_RDONLY | O_CREAT, 0666);
+  if (fd < 0) {
+    return false;
+  }
+  return (close(fd) == 0);
+}
+
+
 char* File::GetCanonicalPath(const char* pathname) {
   char* abs_path = NULL;
   if (pathname != NULL) {
     // On some older MacOs versions the default behaviour of realpath allocating
     // space for the resolved_path when a NULL is passed in does not seem to
     // work, so we explicitly allocate space. The caller is responsible for
     // freeing this space as in a regular realpath call.
     char* resolved_path = reinterpret_cast<char*>(malloc(PATH_MAX+1));
     ASSERT(resolved_path != NULL);
     abs_path = realpath(pathname, resolved_path);
     assert(abs_path == NULL || IsAbsolutePath(abs_path));
   }
   return abs_path;
 }
 
 
 const char* File::PathSeparator() {
   return "/";
 }
 
 
 const char* File::StringEscapedPathSeparator() {
   return "/";
 }