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#include <sys/stat.h>
#include <fcntl.h>
#include <cerrno>
#include <Common/ProfileEvents.h>
#include <base/defines.h>
#include <IO/WriteBufferFromFile.h>
#include <IO/WriteHelpers.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;
}
WriteBufferFromFile::WriteBufferFromFile(
const std::string & file_name_,
size_t buf_size,
int flags,
ThrottlerPtr throttler_,
mode_t mode,
char * existing_memory,
size_t alignment)
: WriteBufferFromFileDescriptor(-1, buf_size, existing_memory, throttler_, alignment, file_name_)
{
ProfileEvents::increment(ProfileEvents::FileOpen);
#ifdef OS_DARWIN
bool o_direct = (flags != -1) && (flags & O_DIRECT);
if (o_direct)
flags = flags & ~O_DIRECT;
#endif
fd = ::open(file_name.c_str(), flags == -1 ? O_WRONLY | O_TRUNC | O_CREAT | O_CLOEXEC : flags | O_CLOEXEC, mode);
if (-1 == fd)
throwFromErrnoWithPath("Cannot open file " + file_name, file_name,
errno == ENOENT ? ErrorCodes::FILE_DOESNT_EXIST : ErrorCodes::CANNOT_OPEN_FILE);
#ifdef OS_DARWIN
if (o_direct)
{
if (fcntl(fd, F_NOCACHE, 1) == -1)
throwFromErrnoWithPath("Cannot set F_NOCACHE on file " + file_name, file_name, ErrorCodes::CANNOT_OPEN_FILE);
}
#endif
}
/// Use pre-opened file descriptor.
WriteBufferFromFile::WriteBufferFromFile(
int & fd_,
const std::string & original_file_name,
size_t buf_size,
ThrottlerPtr throttler_,
char * existing_memory,
size_t alignment)
: WriteBufferFromFileDescriptor(fd_, buf_size, existing_memory, throttler_, alignment, original_file_name)
{
fd_ = -1;
}
WriteBufferFromFile::~WriteBufferFromFile()
{
if (fd < 0)
return;
finalize();
int err = ::close(fd);
/// Everything except for EBADF should be ignored in dtor, since all of
/// others (EINTR/EIO/ENOSPC/EDQUOT) could be possible during writing to
/// fd, and then write already failed and the error had been reported to
/// the user/caller.
///
/// Note, that for close() on Linux, EINTR should *not* be retried.
chassert(!(err && errno == EBADF));
}
void WriteBufferFromFile::finalizeImpl()
{
if (fd < 0)
return;
next();
}
/// Close file before destruction of object.
void WriteBufferFromFile::close()
{
if (fd < 0)
return;
finalize();
if (0 != ::close(fd))
throw Exception(ErrorCodes::CANNOT_CLOSE_FILE, "Cannot close file");
fd = -1;
metric_increment.destroy();
}
}
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