From Wayne.Zhang at barclayscapital.com  Tue Mar  8 16:01:45 2011
From: Wayne.Zhang at barclayscapital.com (Wayne.Zhang at barclayscapital.com)
Date: Tue, 8 Mar 2011 10:01:45 -0500
Subject: [Rd] How to disable R's crash prompt
In-Reply-To: <alpine.LFD.2.02.1103081444360.23577@gannet.stats.ox.ac.uk>
References: <A02FE3A5690A624994A6A0BC0DEEA920072D48316B@NYKPCMMGMB05.INTRANET.BARCAPINT.COM>
	<alpine.LFD.2.02.1103081444360.23577@gannet.stats.ox.ac.uk>
Message-ID: <A02FE3A5690A624994A6A0BC0DEEA920072D48316C@NYKPCMMGMB05.INTRANET.BARCAPINT.COM>

Thanks for your quick comment Mr. Ripley.  I'm a newbie in R so excuse me for not knowing the obvious.  Could you elaborate on what code I should look at, and what documentation I should go to?

This is my C++ code on calling embedded R (on redhat enterprise linux 4):

    char *localArgs[] = { "R", "--silent" };  // tried --slave, -f, --vanilla too
    Rf_initEmbeddedR(sizeof(localArgs)/sizeof(localArgs[0]), localArgs);

    PROTECT(load = lang2(install("source"), mkString(file.c_str())));	// file contains R code
    R_tryEval(load, R_GlobalEnv, &errorOccurred);

    PROTECT(call = lang2(install(entryPoint.c_str()), input));    // entry point is an R function defined in "file" above
    PROTECT(output = R_tryEval(call, R_GlobalEnv, &errorOccurred));

    UNPROTECT(3);


What should I do in C++ to make R non-interactive?

Thanks,
Wayne


-----Original Message-----
From: Prof Brian Ripley [mailto:ripley at stats.ox.ac.uk] 
Sent: Tuesday, March 08, 2011 9:51 AM
To: Zhang, Wayne: IT (NYK)
Cc: r-devel at r-project.org
Subject: Re: [Rd] How to disable R's crash prompt

On Tue, 8 Mar 2011, Wayne.Zhang at barclayscapital.com wrote:

> Dear R devel,
>
> I have a C++ app that calls into embedded R to perform some analytic 
> calculations.  When my app encounters a segmentation fault, R always 
> prints the following crash prompt and asks me to enter an action:
>
>
> *** caught segfault ***
> address 0x8, cause 'memory not mapped'
>
> Possible actions:
> 1: abort (with core dump, if enabled)
> 2: normal R exit
> 3: exit R without saving workspace
> 4: exit R saving workspace
>
>
>
> The problem is my app will be run in non-interactive mode, so there 
> is no way for me to enter the action.  Is there a way to disable the

R does not do that in 'non-interactive mode'. Take a look at the 
code: that section is conditional on R_Interactive.

> crash prompt and have R simply crash the whole app?  I have tried 
> using "-file=/dev/null", "-slave", "-vanilla", and pretty much all 
> other start options, to no avail.

They do not control if R is interactive: the front-end (yours, I 
presume since you mention embedding but do not otherwise give any 
details) does.

> Thanks in advance for your help,
>
> Wayne

-- 
Brian D. Ripley,                  ripley at 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 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595
_______________________________________________

This e-mail may contain information that is confidential, privileged or otherwise protected from disclosure. If you are not an intended recipient of this e-mail, do not duplicate or redistribute it by any means. Please delete it and any attachments and notify the sender that you have received it in error. Unless specifically indicated, this e-mail is not an offer to buy or sell or a solicitation to buy or sell any securities, investment products or other financial product or service, an official confirmation of any transaction, or an official statement of Barclays. Any views or opinions presented are solely those of the author and do not necessarily represent those of Barclays. This e-mail is subject to terms available at the following link: www.barcap.com/emaildisclaimer. By messaging with Barclays you consent to the foregoing.  Barclays Capital is the investment banking division of Barclays Bank PLC, a company registered in England (number 1026167) with its registered office at 1 Churchill Place, London, E14 5HP.  This email may relate to or be sent from other members of the Barclays Group.



[Rd] How to disable R's crash prompt
Wayne.Zhang at barclayscapital.com