Исходное сообщение
"Выпуск набора базовых системных утилит GNU Coreutils 8.29" Отправлено Аноним, 29-Дек-17 01:23
> Not specified in POSIX.1-2001, nor in other standards. > Other UNIX systems implement sendfile() with different semantics and prototypes. It should not be used in portable programs. > sendfile() will transfer at most 0x7ffff000 (2,147,479,552) bytes, returning the number of bytes actually transferred. (This is true on both 32-bit and 64-bit systems.) > In Linux 2.4 and earlier, out_fd could also refer to a regular file; this possibility went away in the Linux 2.6.x kernel series, but was restored in Linux 2.6.33. > The original Linux sendfile() system call was not designed to handle large file offsets. Consequently, Linux 2.4 added sendfile64(), with a wider type for the offset argument. > Applications may wish to fall back to read(2)/write(2) in the case where sendfile() fails with EINVAL or ENOSYS. Думаю, они просто не хотят возиться со всем этим при том, что "рид-врайт в цикле" пишется за минуту и работает везде.