[Rd] Tcl socket server (tcltk) does not work any more on R 4.3.2

[Dirk Eddelbuettel]

On 20 February 2024 at 12:27, webmail.gandi.net wrote:
| Dear list,
| 
| It seems that something changed between R 4.2.3 and R 4.3 (tested with 4.3.2) that broke the Tcl socket server. Here is a reproducible example:
| 
| - R process #1 (Tcl socket server):
| 
| library(tcltk)
| cmd <- r"(
|  proc accept {chan addr port} {         ;# Make a proc to accept connections
|    puts "$addr:$port says [gets $chan]" ;# Receive a string
|    puts $chan goodbye                   ;# Send a string
|    close $chan                          ;# Close the socket (automatically flushes)
| }                                       ;#
| socket -server accept 12345             ;# Create a server socket)"
| .Tcl(cmd)
| 
| - R process #2 (socket client):
| 
| con <- socketConnection(host = "localhost", port = 12345, blocking = FALSE)
| writeLines("Hello, world!", con) # Should print something in R #1 stdout
| readLines(con) # Should receive "goodbye"
| close(con)
| 
| When R process #1 is R 4.2.3, it works as expected (whatever version of R #2). When R process #1 is R 4.3.2, nothing is sent or received through the socket apparently, but no error is issued and process #2 seems to be able to connect to the socket.
| 
| I am stuck with this. Thanks in advance for help.

>From a quick check this issue seems to persist in the (current) R-devel
2024-02-20 r85951 too.

Dirk

| Regards,
| 
| Philippe
| 
| > .Tcl("puts [info patchlevel]")
| 8.6.13
| <Tcl>  
| 
| > sessionInfo()
| R version 4.3.2 (2023-10-31)
| Platform: aarch64-apple-darwin20 (64-bit)
| Running under: macOS Sonoma 14.2.1
| 
| Matrix products: default
| BLAS:   /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libBLAS.dylib 
| LAPACK: /Library/Frameworks/R.framework/Versions/4.3-arm64/Resources/lib/libRlapack.dylib;  LAPACK version 3.11.0
| 
| locale:
| [1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8
| 
| time zone: Europe/Brussels
| tzcode source: internal
| 
| attached base packages:
| [1] tcltk     stats     graphics  grDevices utils     datasets  methods   base     
| 
| loaded via a namespace (and not attached):
| [1] compiler_4.3.2 tools_4.3.2    glue_1.7.0  
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-- 
dirk.eddelbuettel.com | @eddelbuettel | edd using debian.org