Re: source(builtin) and read(2)

[Matthew Woehlke]

Andreas Schwab wrote:
> Matthew Woehlke writes:
> > Um. In fact, it is also an *ERROR* (i.e. read() will fail outright with -
> > IIRC - EINVAL) to try to read more than SSIZE_MAX bytes at once. Many, but
> > not all, systems define SSIZE_MAX to be a very large value, but it may be
> > as small as 32k. I guess I've never tried to source an autoconf configure
> > script on such a system.
>
> If your ssize_t is smaller than 32 bits you'll have to worry about more
> things than that.

Huh? I never said anything about ssize_t, I said SSIZE_MAX which appears 
to be guaranteed by POSIX to be at least 32 *kilobytes*, often bigger 
but /not reliably so/. Nothing about sizeof(ssize_t).

The point was that this is an error on some systems:

    read(fd, buffer, 65536); // size > SSIZE_MAX, will fail with EINVAL

--
Matthew
Excessive obscurity: -5