10.0-ALPHA1: /usr/bin/read: strange return code with -t option

[Jilles Tjoelker]

On Tue, Oct 22, 2013 at 02:25:15PM -0400, David Boyd wrote:
> When using /usr/bin/read with the -t option the "timeout" return code should
> be 1 (verified with 8.4-RELEASE and 9.2-RELEASE).  When used with
> 10.0-BETA1, the return code is 142.

> How to recreate:

> /usr/bin/read -t 1 RESPONSE JUNK (allow this to timeout)
> echo $?
> 142

> Also with /bin/sh:

> builtin read -t 1 RESPONSE JUNK (allow this to timeout)
> echo $?
> 142

I changed this to allow distinguishing a timeout from end of file. I
also changed the exit status for read errors and read interrupted by a
trap, so exit status 1 now means end of file only.

Since read used to return 0 and 1 only (except when invalid arguments
are given), I considered this fairly safe.

This change is also in the spirit of
http://austingroupbugs.net/view.php?id=367 and similar to what bash
does.

-- 
Jilles Tjoelker