Support 64-bit reserved_at_zero value chrome-side

chrome/nacl/nacl_helper_linux.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.
 
 // A mini-zygote specifically for Native Client.
 
 #include "chrome/common/nacl_helper_linux.h"
 
 #include <errno.h>
 #include <link.h>
@@ skipping 157 matching lines @@
        * came in as our argv[0].
        */
       struct link_map *l = _r_debug.r_map;
       if (l->l_name[0] == '\0')
         l->l_name = argv0;
     }
   }
 }
 
 /*
- * The zygote passes --reserved_at_zero=0xXXXXXXXX.
+ * The zygote passes --reserved_at_zero=0xXXXXXXXXXXXXXXXX.
  * nacl_helper_bootstrap replaces the Xs with the amount of prereserved
  * sandbox memory.
  *
  * CheckReservedAtZero parses the value of the argument reserved_at_zero
  * and returns the amount of prereserved sandbox memory.
  */
 static size_t CheckReservedAtZero() {
   size_t prereserved_sandbox_size = 0;
   std::string reserved_at_zero_switch_value =
       CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
@@ skipping 70 matching lines @@
       _exit(-1);
     }
     // if fork fails, send PID=-1 to zygote
     if (!UnixDomainSocket::SendMsg(kNaClZygoteDescriptor, &badpid,
                                    sizeof(badpid), empty)) {
       LOG(ERROR) << "*** send() to zygote failed";
     }
   }
   CHECK(false);  // This routine must not return
 }