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/*
* Memory Locking Functions
* (C) 1999-2007 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/internal/mlock.h>
#if defined(BOTAN_TARGET_OS_HAS_POSIX_MLOCK)
#include <sys/types.h>
#include <sys/mman.h>
#elif defined(BOTAN_TARGET_OS_HAS_WIN32_VIRTUAL_LOCK)
#include <windows.h>
#endif
namespace Botan {
bool has_mlock()
{
byte buf[4096];
if(!lock_mem(&buf, sizeof(buf)))
return false;
unlock_mem(&buf, sizeof(buf));
return true;
}
/*
* Lock an area of memory into RAM
*/
bool lock_mem(void* ptr, size_t bytes)
{
#if defined(BOTAN_TARGET_OS_HAS_POSIX_MLOCK)
return (::mlock((char*)ptr, bytes) == 0);
#elif defined(BOTAN_TARGET_OS_HAS_WIN32_VIRTUAL_LOCK)
return (::VirtualLock(ptr, bytes) != 0);
#else
return false;
#endif
}
/*
* Unlock a previously locked region of memory
*/
void unlock_mem(void* ptr, size_t bytes)
{
#if defined(BOTAN_TARGET_OS_HAS_POSIX_MLOCK)
::munlock((char*)ptr, bytes);
#elif defined(BOTAN_TARGET_OS_HAS_WIN32_VIRTUAL_LOCK)
::VirtualUnlock(ptr, bytes);
#endif
}
}
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