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Use a predefined byte order, integers with fixed width, etc.
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This makes sure we use the dual-stack feature to support both IPv4 and
IPv6.
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Apparently, if you try to write() into a socket with the other party
already gone, your process receives a SIGPIPE. Wtf?
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First, rename all API functions so that they start with net_.
Second, abstract the basic TCP server functionality into tcp_server.c.
This includes reworking net_accept so that it's a simple blocking
operation, and putting the callback stuff to tcp_server.c. Also, the
server now uses detached threads instead of fork(), since I want
connection handlers to share memory.
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I've only recently learned about this flag, seems generally useful.
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Make sure we handle read() returning 0, this is a valid use-case.
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A basic client-server app, the client sends commands as an array of
strings. Hopefully I didn't mess up, and hopefully it'll be useful.
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