A common complaint about the module API is that modules can't
communicate asynchronously with Emacs. While it isn't possible to
call arbitrary Emacs functions asynchronously, writing to a pipe
should always be fine and is a pretty low-hanging fruit.
This patch implements a function that adapts an existing pipe
process. That way, users can use familiar tools like process filters
or 'accept-process-output'.
* src/module-env-28.h: Add 'open_channel' module function.
* src/emacs-module.c (module_open_channel): Provide definition for
'open_channel'.
(initialize_environment): Use it.
* src/process.c (open_channel_for_module): New helper function.
(syms_of_process): Define necessary symbol.
* test/src/emacs-module-tests.el (module/async-pipe): New unit test.
* test/data/emacs-module/mod-test.c (signal_system_error): New helper
function.
(signal_errno): Use it.
(write_to_pipe): New function running in the background.
(Fmod_test_async_pipe): New test module function.
(emacs_module_init): Export it.
* doc/lispref/internals.texi (Module Misc): Document new module
function.
* doc/lispref/processes.texi (Asynchronous Processes): New anchor
for pipe processes.
* etc/NEWS: Document 'open_channel' function.
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