IPCd: first commit. Basic switch.

.gitignore

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+/docs/
+/lib/
+/bin/
+/.shards/
+*.dwarf
+shard.lock

README.md

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+# ipcd
+
+TODO: Write a description here
+
+## Installation
+
+TODO: Write installation instructions here
+
+## Usage
+
+TODO: Write usage instructions here
+
+## Development
+
+TODO: Write development instructions here
+
+## Contributing
+
+1. Fork it (<https://github.com/your-github-user/ipcd/fork>)
+2. Create your feature branch (`git checkout -b my-new-feature`)
+3. Commit your changes (`git commit -am 'Add some feature'`)
+4. Push to the branch (`git push origin my-new-feature`)
+5. Create a new Pull Request
+
+## Contributors
+
+- [Philippe PITTOLI](https://github.com/your-github-user) - creator and maintainer

shard.yml

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+name: ipcd
+version: 0.1.0
+
+authors:
+  - Philippe PITTOLI <karchnu@karchnu.fr>
+
+targets:
+  ipcd:
+    main: src/ipcd.cr
+
+dependencies:
+  ipc:
+    git: https://git.baguette.netlib.re/Baguette/ipc.cr
+
+crystal: '>= 1.12.2'
+
+license: ISC

src/ipcd.cr

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+require "ipc"
+
+# TODO: Write documentation for `IPCd`
+module IPCd
+	VERSION = "0.1.0"
+
+	def self.start
+		ipcd = IPC.new()
+		ipcd.service_init "hello"
+		ipcd.timer 10_000
+		ipcd.loop do |event|
+			begin
+				case event.type
+				when LibIPC::EventType::Timer
+					puts "Timer."
+
+				when LibIPC::EventType::Connection
+					fd = ipcd.connect "pong"
+					ipcd.add_switch event.newfd, fd
+					input  = -> fn_input( LibC::Int, LibC::Char*, LibC::UInt64T*)
+					output = -> fn_output(LibC::Int, LibC::Char*, LibC::UInt64T )
+					ipcd.switch_callbacks event.newfd, input, output
+					puts "New connection (#{event.newfd}) now automatically switched to 'pong' (#{fd})!"
+
+				when LibIPC::EventType::Disconnection
+					puts "Disconnection from #{event.fd}."
+
+				when LibIPC::EventType::MessageTx
+					puts "Message sent to #{event.fd}."
+
+				when LibIPC::EventType::MessageRx
+					puts "Message received from #{event.fd}."
+
+				when LibIPC::EventType::SwitchRx
+					puts "Switch message received from #{event.fd}."
+
+				when LibIPC::EventType::SwitchTx
+					puts "Switch message sent to #{event.fd}."
+
+				when LibIPC::EventType::Error
+					puts "And error occured on fd #{event.fd}."
+
+				else
+					puts "Unhandled IPC event: #{event.class}."
+					if event.responds_to?(:fd)
+						puts "closing #{event.fd}"
+						ipcd.close event.fd
+					end
+				end
+
+			rescue exception
+				puts "exception: #{typeof(exception)} - #{exception.message}"
+			end
+		end
+	end
+end
+
+def fn_input(fd : LibC::Int, buffer : LibC::Char*, buflen : LibC::UInt64T*) : LibC::Char
+	puts "switch input: #{fd}"
+	io = IO::FileDescriptor.new fd, close_on_finalize: false
+	slice = Bytes.new buffer, buflen.value
+	len = io.read slice
+	buflen.value = len.to_u64
+	return 2_u8 if (len == 0)
+	0_u8
+rescue e
+	puts "fn_input exception! #{e}"
+	1_u8
+end
+
+def fn_output(fd : LibC::Int, buffer : LibC::Char*, buflen : LibC::UInt64T)  : LibC::Char
+	puts "switch output: #{fd}"
+	slice = Bytes.new buffer, buflen
+	io = IO::FileDescriptor.new fd, close_on_finalize: false
+	io.write slice
+	io.flush
+	0_u8
+rescue e
+	puts "fn_output exception! #{e}"
+	1_u8
+end
+
+IPCd.start