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#include <mutex>
#include <unistd.h>
#include <fcntl.h>
#include <Common/ProfileEvents.h>
#include <Common/Exception.h>
#include <IO/OpenedFile.h>
namespace ProfileEvents
{
extern const Event FileOpen;
}
namespace DB
{
namespace ErrorCodes
{
extern const int FILE_DOESNT_EXIST;
extern const int CANNOT_OPEN_FILE;
extern const int CANNOT_CLOSE_FILE;
}
void OpenedFile::open() const
{
ProfileEvents::increment(ProfileEvents::FileOpen);
fd = ::open(file_name.c_str(), (flags == -1 ? 0 : flags) | O_RDONLY | O_CLOEXEC);
if (-1 == fd)
throwFromErrnoWithPath("Cannot open file " + file_name, file_name,
errno == ENOENT ? ErrorCodes::FILE_DOESNT_EXIST : ErrorCodes::CANNOT_OPEN_FILE);
}
int OpenedFile::getFD() const
{
std::lock_guard l(mutex);
if (fd == -1)
open();
return fd;
}
std::string OpenedFile::getFileName() const
{
return file_name;
}
OpenedFile::OpenedFile(const std::string & file_name_, int flags_)
: file_name(file_name_), flags(flags_)
{
}
OpenedFile::~OpenedFile()
{
close(); /// Exceptions will lead to std::terminate and that's Ok.
}
void OpenedFile::close()
{
std::lock_guard l(mutex);
if (fd == -1)
return;
if (0 != ::close(fd))
throw Exception(ErrorCodes::CANNOT_CLOSE_FILE, "Cannot close file");
fd = -1;
metric_increment.destroy();
}
}
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