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