ipc/glue/SharedMemory_posix.cpp
author Ed Morley <bmo@edmorley.co.uk>
Thu, 06 Oct 2011 17:15:07 +0100
changeset 78250 ec4cb3b08fa1a11ed6c9de16ab0b21c2e660506e
parent 36152 5ffc5409203c649967a622154eb7437eeb10fdd8
child 94846 f4157e8c410708d76703f19e4dfb61859bfe32d8
permissions -rw-r--r--
Bug 689884 - Skip Makefiles that are no-op or else only |DIRS = a_single_subdir|; r=khuey

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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/* ***** BEGIN LICENSE BLOCK *****
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#include <sys/mman.h>         // mprotect
#include <unistd.h>           // sysconf

#include "mozilla/ipc/SharedMemory.h"

namespace mozilla {
namespace ipc {

void
SharedMemory::SystemProtect(char* aAddr, size_t aSize, int aRights)
{
  int flags = 0;
  if (aRights & RightsRead)
    flags |= PROT_READ;
  if (aRights & RightsWrite)
    flags |= PROT_WRITE;
  if (RightsNone == aRights)
    flags = PROT_NONE;

  if (0 < mprotect(aAddr, aSize, flags))
    NS_RUNTIMEABORT("can't mprotect()");
}

size_t
SharedMemory::SystemPageSize()
{
  return sysconf(_SC_PAGESIZE);
}

} // namespace ipc
} // namespace mozilla