On 02/25/2013 09:22 AM, Ulrich Drepper wrote:
> When using sendfile with a non-blocking output file descriptor for a
> socket the operation can cause a partial write because of capacity
> issues. This is nothing critical and the operation could resume after
> the output queue is cleared. The problem is: there is no way to
> determine where to resume.
>
> The system call just returns -EAGAIN without any further indication.
> The caller doesn't know what to resend.
This is IMO just a bug. EAGAIN should only be used in the zero-byte
case and in other cases it should return the number of bytes
transferred, just like all the read/write system calls.
This was clearly also the intent.
-hpa
--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.
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