From wdun|@p @end|ng |rom t|bco@com  Fri Dec  6 18:13:59 2019
From: wdun|@p @end|ng |rom t|bco@com (William Dunlap)
Date: Fri, 6 Dec 2019 09:13:59 -0800
Subject: [Rd] Error in close.connection(p) : ignoring SIGPIPE signal
In-Reply-To: <c525244e-cd3c-6dc5-52a8-837ff982489d@gmail.com>
References: <E1id7fZ-0000XB-A0@rmmprod05.runbox>
 <c525244e-cd3c-6dc5-52a8-837ff982489d@gmail.com>
Message-ID: <CAF8bMcaRW3S0mDJjsCKV7gz5dK4GaGe7S3fZ=0ga+_9R12ef4Q@mail.gmail.com>

You may be running out of file descriptors because the pipe objects are not
getting garbage collected often enough.  Adding the line
   if (cnt %% 100 == 0) { cat(cnt, "\n"); gc() }
to your loop  lets it continue indefinitely.

Bill Dunlap
TIBCO Software
wdunlap tibco.com


On Fri, Dec 6, 2019 at 4:29 AM Benjamin Tyner <btyner at gmail.com> wrote:

> Andreas,
>
> How right you are! Still, I find it curious that in the context of the
> while(TRUE) loop, I am allowed to do this 653 times, with failure on the
> 654th attempt. Perhaps there is something asynchronous going on? If I
> eliminate the looping, it does indeed fail (as expected) on the first
> attempt to close the pipe.
>
> Regards
>
> Ben
>
> On 12/6/19 2:04 AM, Andreas Kersting wrote:
> > Hi Benjamin,
> >
> > you cannot pipe to echo, since it does not read from stdin.
> >
> > echo just echos is first arg, i.e. echo /dev/stdin > /dev/null will echo
> the string "/dev/stdin"to /dev/stdout, which is redirected to /dev/null.
> >
> > Try
> >
> > p <- pipe("cat > /dev/null", open = "w")
> >
> > instead.
> >
> > Regards,
> > Andreas
> >
> > 2019-12-06 02:46 GMT+01:00 Benjamin Tyner<btyner at gmail.com>:
> >> Not sure if this is a bug, so posting here first. If I run:
> >>     cnt <- 0L
> >>     while (TRUE) {
> >>         cnt <- cnt + 1L
> >>         p <- pipe("echo /dev/stdin > /dev/null", open = "w")
> >>         writeLines("foobar", p)
> >>         tryCatch(close(p), error = function(e) { print(cnt); stop(e)})
> >>     }
> >>
> >> then once cnt gets to around 650, it fails with:
> >>
> >>     [1] 654
> >>     Error in close.connection(p) : ignoring SIGPIPE signal
> >>
> >> Should I not be using pipe() in this way? Here is my sessionInfo()
> >>
> >>     R version 3.6.0 (2019-04-26)
> >>     Platform: x86_64-pc-linux-gnu (64-bit)
> >>     Running under: Ubuntu 18.04.3 LTS
> >>
> >>     Matrix products: default
> >>     BLAS:   /home/btyner/R360/lib64/R/lib/libRblas.so
> >>     LAPACK: /home/btyner/R360/lib64/R/lib/libRlapack.so
> >>
> >>     locale:
> >>      [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C
> >>      [3] LC_TIME=en_US.UTF-8        LC_COLLATE=en_US.UTF-8
> >>      [5] LC_MONETARY=en_US.UTF-8    LC_MESSAGES=en_US.UTF-8
> >>      [7] LC_PAPER=en_US.UTF-8       LC_NAME=C
> >>      [9] LC_ADDRESS=C               LC_TELEPHONE=C
> >>     [11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C
> >>
> >>     attached base packages:
> >>     [1] stats     graphics  grDevices utils     datasets  methods base
> >>
> >>     loaded via a namespace (and not attached):
> >>     [1] compiler_3.6.0
> >>
> >> Regards,
> >> Ben
> >>
> >> ______________________________________________
> >> R-devel at r-project.org mailing list
> >> https://stat.ethz.ch/mailman/listinfo/r-devel
>
> ______________________________________________
> R-devel at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
>

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[Rd] Error in close.connection(p) : ignoring SIGPIPE signal
William Dunlap