From ripley@stats.ox.ac.uk  Sun Aug 25 10:49:01 2002
From: ripley@stats.ox.ac.uk (Prof Brian D Ripley)
Date: Sun, 25 Aug 2002 10:49:01 +0100 (BST)
Subject: try-error in batch and interactive mode (PR#1934)
In-Reply-To: <200208231640.SAA25105@pubhealth.ku.dk>
Message-ID: <Pine.GSO.4.44.0208251044560.16589-100000@auk.stats>

This is caused by the call to

fflush(stdin)

in Rstd_FlushConsole() in src/unix/sys-std.c.  I've commented on that
before: fflush on an input stream is not defined on the Solaris help page,
and it appears to flush piped input.

I've removed the call.  If anyone knows what it was intended to accomplish,
please find another way to do it.


On Fri, 23 Aug 2002 jyan@stat.wisc.edu wrote:

> I have a tiny R script performing two tasks, the first one of which may
> contain error.
>
> mammon(12)% cat z.R
> version
> options(show.error.messages = FALSE)
> try(b <- log("foo"))  ## task 1
> 1 + 2                 ## task 2
>
> Running in batch mode from a solaries machine, the second task never got
> started; see below:
>
> mammon(13)% R BATCH --vanilla -q z.R
> mammon(14)% cat z.Rout
> > invisible(options(echo = TRUE))
> > version
>          _
> platform sparc-sun-solaris2.8
> arch     sparc
> os       solaris2.8
> system   sparc, solaris2.8
> status
> major    1
> minor    5.1
> year     2002
> month    06
> day      17
> language R
> > options(show.error.messages = FALSE)
> > try(b <- log("foo"))
> >
>
> The second task does start if run on a linux machine.
>
> ludwig(22)% cat z.Rout
> > invisible(options(echo = TRUE))
> > version
>          _
> platform i686-pc-linux-gnu
> arch     i686
> os       linux-gnu
> system   i686, linux-gnu
> status
> major    1
> minor    5.1
> year     2002
> month    06
> day      17
> language R
> > options(show.error.messages = FALSE)
> > try(b <- log("foo"))
> > 1 + 2
> [1] 3
> > proc.time()
> [1] 0.87 0.07 0.90 0.00 0.00
> >
>
> The same code works well if pasted into an interactive R window on both
> system, of course.
>
> Jun Yan
>
> Department of Statistics          Office: CSSC 4252
> university of Wisconsin-Madison   Tel: (608)262-7478
> 1210 W. Dayton St.                Email: jyan@stat.wisc.edu
> Madison, WI 53706                 URL: http://www.stat.wisc.edu/~jyan
>
>
>
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-- 
Brian D. Ripley,                  ripley@stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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try-error in batch and interactive mode (PR#1934)
Prof Brian D Ripley