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#ifndef SOURCETOOLS_READ_POSIX_MEMORY_MAPPED_CONNECTION_H
#define SOURCETOOLS_READ_POSIX_MEMORY_MAPPED_CONNECTION_H
#include <cstdlib>
#include <fcntl.h>
#include <sys/mman.h>
#include <sourcetools/platform/platform.h>
namespace sourcetools {
namespace detail {
class MemoryMappedConnection
{
public:
MemoryMappedConnection(int fd, std::size_t size)
: size_(size)
{
#ifdef MAP_POPULATE
map_ = (char*) ::mmap(0, size, PROT_READ, MAP_SHARED | MAP_POPULATE, fd, 0);
#else
map_ = (char*) ::mmap(0, size, PROT_READ, MAP_SHARED, fd, 0);
#endif
#if defined(POSIX_MADV_SEQUENTIAL) && defined(POSIX_MADV_WILLNEED)
::posix_madvise((void*) map_, size, POSIX_MADV_SEQUENTIAL | POSIX_MADV_WILLNEED);
#endif
}
~MemoryMappedConnection()
{
if (map_ != MAP_FAILED)
::munmap(map_, size_);
}
bool open()
{
return map_ != MAP_FAILED;
}
operator char*() const
{
return map_;
}
private:
char* map_;
std::size_t size_;
};
} // namespace detail
} // namespace sourcetools
#endif /* SOURCETOOLS_READ_POSIX_MEMORY_MAPPED_CONNECTION_H */
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