What's the gist of the problem of making/having this part of the public API? Is it security, is it stability, is it that the current API is under construction, is it a worry about maintenance load for R Core, ...? Do we know why?
It sounds like it's a feature that is useful. I think we missed out on some great enhancements in the past because of it not being part of the public API. /Henrik On Wed, May 6, 2020, 16:26 Martin Morgan <mtmorgan.b...@gmail.com> wrote: > yep, you're right, after some initial clean-up and running with or without > --as-cran R CMD check gives a NOTE > > * checking compiled code > File ‘socketeer/libs/socketeer.so’: > Found non-API calls to R: ‘R_GetConnection’, > ‘R_new_custom_connection’ > > Compiled code should not call non-API entry points in R. > > See 'Writing portable packages' in the 'Writing R Extensions' manual. > > Connections in general seem more useful than ad-hoc functions, though > perhaps for Frederick's use case Duncan's suggestion is sufficient. For > non-CRAN packages I personally would implement a connection. > > (I mistakenly thought this was a more specialized mailing list; I wouldn't > have posted to R-devel on this topic otherwise) > > Martin Morgan > > On 5/6/20, 4:12 PM, "Gábor Csárdi" <csardi.ga...@gmail.com> wrote: > > AFAIK that API is not allowed on CRAN. It triggers a NOTE or a > WARNING, and your package will not be published. > > Gabor > > On Wed, May 6, 2020 at 9:04 PM Martin Morgan <mtmorgan.b...@gmail.com> > wrote: > > > > The public connection API is defined in > > > > > https://github.com/wch/r-source/blob/trunk/src/include/R_ext/Connections.h > > > > I'm not sure of a good pedagogic example; people who want to write > their own connections usually want to do so for complicated reasons! > > > > This is my own abandoned attempt > https://github.com/mtmorgan/socketeer/blob/b0a1448191fe5f79a3f09d1f939e1e235a22cf11/src/connection.c#L169-L192 > where connection_local_client() is called from R and _connection_local() > creates and populates the appropriate structure. Probably I have done > things totally wrong (e.g., by not checking the version of the API, as > advised in the header file!) > > > > Martin Morgan > > > > On 5/6/20, 2:26 PM, "R-devel on behalf of Duncan Murdoch" < > r-devel-boun...@r-project.org on behalf of murdoch.dun...@gmail.com> > wrote: > > > > On 06/05/2020 1:09 p.m., frede...@ofb.net wrote: > > > Dear R Devel, > > > > > > Since Linux moved away from using a file-system interface for > audio, I think it is necessary to write special libraries to interface with > audio hardware from various languages on Linux. > > > > > > In R, it seems like the appropriate datatype for a `snd_pcm_t` > handle pointing to an open ALSA source or sink would be a "connection". > Connection types are already defined in R for "file", "url", "pipe", > "fifo", "socketConnection", etc. > > > > > > Is there a tutorial or an example package where a new type of > connection is defined, so that I can see how to do this properly in a > package? > > > > > > I can see from the R source that, for example, `do_gzfile` is > defined in `connections.c` and referenced in `names.c`. However, I thought > I should ask here first in case there is a better place to start, than > trying to copy this code. > > > > > > I only want an object that I can use `readBin` and `writeBin` > on, to read and write audio data using e.g. `snd_pcm_writei` which is part > of the `alsa-lib` package. > > > > I don't think R supports user-defined connections, but probably > writing > > readBin and writeBin equivalents specific to your library > wouldn't be > > any harder than creating a connection. For those, you will > probably > > want to work with an "external pointer" (see Writing R > Extensions). > > Rcpp probably has support for these if you're working in C++. > > > > Duncan Murdoch > > > > ______________________________________________ > > 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 > ______________________________________________ > R-devel@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-devel > [[alternative HTML version deleted]] ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
