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 <bty...@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<bty...@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@r-project.org mailing list
> >> https://stat.ethz.ch/mailman/listinfo/r-devel
>
> ______________________________________________
> R-devel@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
>
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