On 08/18/17 09:46 AM, Paul Pluzhnikov wrote:
> On Fri, Aug 18, 2017 at 8:16 AM, Dave Watson <[email protected]> wrote:
>
> > and also handle EINTR
>
> > + int bytes = read (validate_pipe[0], &buf, 1);
> > + if (bytes >= 0 || errno == EAGAIN || errno == EWOULDBLOCK)
>
> On Linux:
>
> #define EWOULDBLOCK EAGAIN /* Operation would block */
>
> Did you mean errno == EINTR above?
No, EINTR should retry again in the loop. I just went by the manpage that
claims
EAGAIN or EWOULDBLOCK
The file descriptor fd refers to a socket and has been marked nonblocking
(O_NONBLOCK), and the read would
block. POSIX.1-2001 allows either error to be returned for this case,
and does not require these constants to
have the same value, so a portable application should check for both
possibilities.
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