Function _sendfile

Lib/pathlib/_os.py:87–98

Copy data from one regular mmap-like fd to another by using high-performance sendfile(2) syscall. This should work on Linux >= 2.6.33 only.

(source_fd, target_fd)

if hasattr(os, 'sendfile'):
    def _sendfile(source_fd, target_fd):
        """Copy data from one regular mmap-like fd to another by using
        high-performance sendfile(2) syscall.
        This should work on Linux >= 2.6.33 only.
        """
        blocksize = _get_copy_blocksize(source_fd)
        offset = 0
        while True:
            sent = os.sendfile(target_fd, source_fd, offset, blocksize)
            if sent == 0:
                break  # EOF
            offset += sent
else:
    _sendfile = None