The Tor Browser: ipc/glue/SharedMemory

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-

     2  * vim: sw=2 ts=8 et :

     3  */

     4 /* This Source Code Form is subject to the terms of the Mozilla Public

     5  * License, v. 2.0. If a copy of the MPL was not distributed with this

     6  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     8 #include <sys/mman.h>         // mprotect

     9 #include <unistd.h>           // sysconf

    11 #include "mozilla/ipc/SharedMemory.h"

    13 namespace mozilla {

    14 namespace ipc {

    16 void

    17 SharedMemory::SystemProtect(char* aAddr, size_t aSize, int aRights)

    18 {

    19   int flags = 0;

    20   if (aRights & RightsRead)

    21     flags |= PROT_READ;

    22   if (aRights & RightsWrite)

    23     flags |= PROT_WRITE;

    24   if (RightsNone == aRights)

    25     flags = PROT_NONE;

    27   if (0 < mprotect(aAddr, aSize, flags))

    28     NS_RUNTIMEABORT("can't mprotect()");

    29 }

    31 size_t

    32 SharedMemory::SystemPageSize()

    33 {

    34   return sysconf(_SC_PAGESIZE);

    35 }

    37 } // namespace ipc

    38 } // namespace mozilla

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