/// Calls the given fcntl. Use FCNTLID macro to pass in both \p name and \p request.
int fstream::fcntl (const char* rname, int request, long argument)
{
int rv = ::fcntl (m_fd, request, argument);
if (rv < 0)
set_and_throw (failbit, rname);
return (rv);
}
/// Memory-maps the file and returns a link to it.
memlink fstream::mmap (off_t n, off_t offset)
{
void* result = ::mmap (NULL, n, PROT_READ | PROT_WRITE, MAP_SHARED, m_fd, offset);
if (result == MAP_FAILED)
set_and_throw (failbit, "mmap");
return (memlink (result, n));
}
/// Moves the current file position to \p n.
off_t fstream::seek (off_t n, seekdir whence)
{
off_t p = lseek (m_fd, n, whence);
if (p < 0)
set_and_throw (failbit, "seek");
return (p);
}
/// Attaches to the given \p nfd.
void fstream::attach (int nfd, const char* filename)
{
assert (filename && "Don't do that");
m_Filename = filename;
clear (goodbit);
if (nfd < 0)
set_and_throw (badbit, "open");
close();
m_fd = nfd;
}
/// Reads at most \p n bytes into \p p, stopping when it feels like it.
off_t fstream::readsome (void* p, off_t n)
{
ssize_t brn;
do { brn = ::read (m_fd, p, n); } while ((brn < 0) & (errno == EINTR));
if (brn > 0)
return (brn);
else if ((brn < 0) & (errno != EAGAIN))
set_and_throw (failbit, "read");
else if (!brn && ios_base::set_and_throw (eofbit | failbit))
throw stream_bounds_exception ("read", name(), pos(), n, 0);
return (0);
}
/// Closes the file and throws on error.
void fstream::close (void)
{
if (m_fd < 0)
return; // already closed
while (::close(m_fd)) {
if (errno != EINTR) {
set_and_throw (badbit | failbit, "close");
break;
}
}
detach();
}
/// Reads at most \p n bytes into \p p, stopping when it feels like it.
off_t fstream::readsome (void* p, off_t n)
{
ssize_t brn;
do { brn = ::read (m_fd, p, n); } while (brn < 0 && errno == EINTR);
if (brn > 0)
return (brn);
if (brn < 0 && errno != EAGAIN)
set_and_throw (failbit, "read");
if (!brn && ios_base::set_and_throw (eofbit | failbit))
#if PLATFORM_ANDROID
printf("stream_bounds_exception\n");
#else /* !PLATFORM_ANDROID */
throw stream_bounds_exception ("read", name(), pos(), n, 0);
#endif
return (0);
}
/// Writes \p n bytes from \p p.
off_t fstream::write (const void* p, off_t n)
{
off_t btw (n);
while (btw) {
const off_t bw (n - btw);
ssize_t bwn = ::write (m_fd, advance(p,bw), btw);
if (bwn > 0)
btw -= bwn;
else if (!bwn) {
if (ios_base::set_and_throw (eofbit | failbit))
throw stream_bounds_exception ("write", name(), pos() - bw, n, bw);
break;
} else if (errno != EINTR) {
if (errno != EAGAIN)
set_and_throw (failbit, "write");
break;
}
}
return (n - btw);
}
/// Checks that \p n bytes are available in the stream, or else throws.
void ios_base::overrun (const char* op, const char* type, uint32_t n, uint32_t pos, uint32_t rem)
{
if (set_and_throw (rem ? failbit : (failbit | eofbit)))
throw exception("stream_bounds_exception");
// throw stream_bounds_exception (op, type, pos, n, rem);
}
/// Synchronizes a memory-mapped area.
void fstream::msync (memlink& l)
{
if (::msync (l.data(), l.size(), MS_ASYNC | MS_INVALIDATE))
set_and_throw (failbit, "msync");
}
/// Unmaps a memory-mapped area.
void fstream::munmap (memlink& l)
{
if (::munmap (l.data(), l.size()))
set_and_throw (failbit, "munmap");
l.unlink();
}
/// Synchronizes the file's data and status with the disk.
void fstream::sync (void)
{
if (fsync (m_fd))
set_and_throw (badbit | failbit, "sync");
}
/// Closes the file and throws on error.
void fstream::close (void)
{
if (m_fd >= 0 && ::close(m_fd))
set_and_throw (badbit | failbit, "close");
detach();
}
