Linus Torvalds wrote:
On Sun, 4 Jun 2006, Linus Torvalds wrote:
On Sun, 4 Jun 2006, H. Peter Anvin wrote:
Or if you're getting a SIGWINCH in the middle of it.
Any POSIX system will interrupt the transfer and return a short read on
receiving a signal.
Only for interruptible fd's, though, which normally a real "file" won't
be.
And _usually_ only if you actually have a SIGWINCH handler.
Although older Linux kernels were broken in this regard. They'd interrupt
a socket/pipe read or write even for a signal that ended up being ignored.
So it's absolutely the case that having the loop is always the safer thing
to do, and it's never the _wrong_ thing to do.
Right. I tend to think of it as implementation-defined the cases where
it happen to be safe, with the one exception of transactions which are
smaller than PIPE_BUF that are directed to a pipe.
-hpa
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