[NaCl SDK} Add EventListener and EventEmitter to support epoll.

native_client_sdk/src/libraries/nacl_io/kernel_wrap_newlib.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <sys/types.h>  // Include something that will define __GLIBC__.
 
 // The entire file is wrapped in this #if. We do this so this .cc file can be
 // compiled, even on a non-newlib build.
 #if defined(__native_client__) && !defined(__GLIBC__)
 
 #include "nacl_io/kernel_wrap.h"
 #include <dirent.h>
 #include <errno.h>
 #include <irt.h>
 #include <sys/mman.h>
 #include <sys/stat.h>
+#include <sys/time.h>
 #include "nacl_io/kernel_intercept.h"
 
 EXTERN_C_BEGIN
 
 #define REAL(name) __nacl_irt_##name##_real
 #define WRAP(name) __nacl_irt_##name##_wrap
 #define STRUCT_NAME(group) __libnacl_irt_##group
 #define DECLARE_STRUCT(group) \
   extern struct nacl_irt_##group STRUCT_NAME(group);
 #define DECLARE_STRUCT_VERSION(group, version) \
@@ skipping 227 matching lines @@
 }
 
 int _real_rmdir(const char* pathname) {
   return ENOSYS;
 }
 
 int _real_write(int fd, const void *buf, size_t count, size_t *nwrote) {
   return REAL(write)(fd, buf, count, nwrote);
 }
 
+uint64_t usec_since_epoch() {
+  struct timeval tv;
+  gettimeofday(&tv, NULL);
+  return tv.tv_usec + (tv.tv_sec * 1000000);
+}
 
 void kernel_wrap_init() {
   static bool wrapped = false;
 
   if (!wrapped) {
     wrapped = true;
     DO_WRAP(fdio, close);
     DO_WRAP(fdio, dup);
     DO_WRAP(fdio, dup2);
     DO_WRAP(fdio, fstat);
     DO_WRAP(fdio, getdents);
     DO_WRAP(fdio, read);
     DO_WRAP(fdio, seek);
     DO_WRAP(fdio, write);
     DO_WRAP(filename, open);
     DO_WRAP(filename, stat);
     DO_WRAP(memory, mmap);
     DO_WRAP(memory, munmap);
   }
 }
 
 
 EXTERN_C_END
 
 
 #endif  // defined(__native_client__) && !defined(__GLIBC__)