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
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