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#include "ace/OS_NS_sys_sendfile.h"
#include "ace/OS_NS_sys_mman.h"
#if defined (ACE_WIN32)
# include "ace/OS_NS_sys_socket.h"
#endif /* ACE_WIN32 */
#include "ace/OS_NS_unistd.h"
#ifndef ACE_HAS_INLINED_OSCALLS
# include "ace/OS_NS_sys_sendfile.inl"
#endif /* ACE_HAS_INLINED_OSCALLS */
#include "ace/Malloc_Base.h"
#include "ace/OS_Memory.h"
#include "ace/os_include/os_errno.h"
ACE_BEGIN_VERSIONED_NAMESPACE_DECL
#if defined ACE_HAS_SENDFILE && ACE_HAS_SENDFILE == 0
ssize_t
ACE_OS::sendfile_emulation (ACE_HANDLE out_fd,
ACE_HANDLE in_fd,
off_t *offset,
size_t count)
{
// @@ Is it possible to inline a call to ::TransmitFile() on
// MS Windows instead of emulating here?
// @@ We may want set up a signal lease (or oplock) if supported by
// the platform so that we don't get a bus error if the mmap()ed
// file is truncated.
void *buf = ACE_OS::mmap (0, count, PROT_READ, MAP_SHARED, in_fd, *offset);
const bool use_read = buf == MAP_FAILED && errno == ENODEV;
ACE_OFF_T prev_pos;
if (use_read)
{
# ifdef ACE_HAS_ALLOC_HOOKS
ACE_ALLOCATOR_RETURN (buf,
ACE_Allocator::instance ()->malloc (count), -1);
# else
ACE_NEW_RETURN (buf, char[count], -1);
# endif
prev_pos = ACE_OS::lseek (in_fd, 0, SEEK_CUR);
if (ACE_OS::lseek (in_fd, *offset, SEEK_SET) == -1
|| ACE_OS::read (in_fd, buf, count) == -1)
return -1;
}
else if (buf == MAP_FAILED)
return -1;
#if defined (ACE_WIN32)
ssize_t const r =
ACE_OS::send (out_fd, static_cast<const char *> (buf), count);
#else
ssize_t const r = ACE_OS::write (out_fd, buf, count);
#endif /* ACE_WIN32 */
if (use_read)
{
ACE_OS::lseek (in_fd, prev_pos, SEEK_SET);
# ifdef ACE_HAS_ALLOC_HOOKS
ACE_Allocator::instance ()->free (buf);
# else
delete[] static_cast<char *> (buf);
# endif
}
else
(void) ACE_OS::munmap (buf, count);
if (r > 0)
*offset += static_cast<off_t> (r);
return r;
}
#endif /* ACE_HAS_SENDFILE==0 */
ACE_END_VERSIONED_NAMESPACE_DECL
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