[Rd] How to disable R's crash prompt

[Wayne.Zhang at barclayscapital.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
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