Function supports_file2file_sendfile

Lib/test/test_shutil.py:128–154

()

    return res

def supports_file2file_sendfile():
    # ...apparently Linux and Solaris are the only ones
    if not hasattr(os, "sendfile"):
        return False
    srcname = None
    dstname = None
    try:
        with tempfile.NamedTemporaryFile("wb", dir=os.getcwd(), delete=False) as f:
            srcname = f.name
            f.write(b"0123456789")

        with open(srcname, "rb") as src:
            with tempfile.NamedTemporaryFile("wb", dir=os.getcwd(), delete=False) as dst:
                dstname = dst.name
                infd = src.fileno()
                outfd = dst.fileno()
                try:
                    os.sendfile(outfd, infd, 0, 2)
                except OSError:
                    return False
                else:
                    return True
    finally:
        if srcname is not None:
            os_helper.unlink(srcname)
        if dstname is not None:
            os_helper.unlink(dstname)


SUPPORTS_SENDFILE = supports_file2file_sendfile()