* Copyright 2014, Ingo Weinhold, ingo_weinhold@gmx.de.
* Distributed under the terms of the MIT License.
*/
#include <FdIO.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
BFdIO::BFdIO()
:
BPositionIO(),
fFd(-1),
fOwnsFd(false)
{
}
BFdIO::BFdIO(int fd, bool keepFd)
:
BPositionIO(),
fFd(fd),
fOwnsFd(keepFd)
{
}
BFdIO::~BFdIO()
{
Unset();
}
void
BFdIO::SetTo(int fd, bool keepFd)
{
Unset();
fFd = fd;
fOwnsFd = keepFd;
}
void
BFdIO::Unset()
{
if (fOwnsFd && fFd >= 0)
close(fFd);
fFd = -1;
fOwnsFd = false;
}
ssize_t
BFdIO::Read(void* buffer, size_t size)
{
ssize_t bytesRead = read(fFd, buffer, size);
return bytesRead >= 0 ? bytesRead : errno;
}
ssize_t
BFdIO::Write(const void* buffer, size_t size)
{
ssize_t bytesWritten = write(fFd, buffer, size);
return bytesWritten >= 0 ? bytesWritten : errno;
}
ssize_t
BFdIO::ReadAt(off_t position, void* buffer, size_t size)
{
ssize_t bytesRead = pread(fFd, buffer, size, position);
return bytesRead >= 0 ? bytesRead : errno;
}
ssize_t
BFdIO::WriteAt(off_t position, const void* buffer, size_t size)
{
ssize_t bytesWritten = pwrite(fFd, buffer, size, position);
return bytesWritten >= 0 ? bytesWritten : errno;
}
off_t
BFdIO::Seek(off_t position, uint32 seekMode)
{
off_t newPosition = lseek(fFd, position, seekMode);
return newPosition >= 0 ? newPosition : errno;
}
off_t
BFdIO::Position() const
{
return const_cast<BFdIO*>(this)->BFdIO::Seek(0, SEEK_CUR);
}
status_t
BFdIO::SetSize(off_t size)
{
return ftruncate(fFd, size) == 0 ? B_OK : errno;
}
status_t
BFdIO::GetSize(off_t* _size) const
{
struct stat st;
if (fstat(fFd, &st) != 0)
return errno;
*_size = st.st_size;
return B_OK;
}
