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https://github.com/matrix-construct/construct
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54 lines
2.2 KiB
Markdown
54 lines
2.2 KiB
Markdown
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# Charybdis Server
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Charybdis is the executable running `libircd`. This application provides an
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interface for the server administrator to start, stop, configure and locally
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communicate with the daemon. It sets up an `asio::io_service` which is passed
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to `libircd`, then it sets up signal handling, and then it runs the ios event
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loop until commanded to exit.
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This program executes in the foreground. It does not "daemonize" anymore with a
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`fork()` etc. You are free to use your shell to execute or move the program
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to the background, or simply use a `tmux` or `screen`. Charybdis will output
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the libircd log to stdout and stderr by default.
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### Signals
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Charybdis handles certain POSIX signals and their behavior is documented
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below. Signals are only handled here in the Charybdis executable; libircd
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itself does not use any signal logic (that we know about).
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* Signal handling is accomplished through `boost::asio`'s mechanism which
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installs a handler to intercept the signal's delivery and posts it to the
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event loop for execution at the next event slice. This is how signal safety
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is achieved. Furthermore, according to boost docs, when signals are used
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this way they can be compatible with windows environments.
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##### SIGINT
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A `ctrl-c` to Charybdis will bring up the command line console interface. It
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will not halt the daemon. Log messages will be suppressed while the console
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is waiting for input, but service is still continuing in the background.
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##### SIGTSTP
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A `ctrl-z` or "Terminal SToP" to Charybdis will bring up the command line
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console like with `SIGINT` except that the entire daemon will pause while
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waiting for console input. When paused, a second `SIGTSTP` will exhibit default
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behavior so your shell can offer its functionality here.
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##### SIGHUP
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A "HangUP" to Charybdis is only relevant to the command line console, and
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signals it to close like an `EOF`. The legacy functionality for reloading
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server configuration et al is moved to `SIGUSR1`.
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##### SIGQUIT
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A `ctrl-\` to Charybdis will cleanly shut down the server. It will not generate
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a coredump.
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##### SIGUSR1
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This signal commands the server to reload and refresh various aspects of its
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configuration and running state.
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