С poll extеnsion

poll_ext is a lightweight, portable C89 helper for building asynchronous socket state machines. It takes care of waiting for socket readiness and notifying via a callback. It doesn’t hide OS differences, doesn’t force any threading model, and stays out of your way.

Features

• Minimal overhead — just event arrays, no extra allocations
• Minimal dependencies - socket OS headers + libc
• Cross-platform without abstractions — native sockets and error codes (E… / WSAE…)
• Thread-safe registration — add sockets from any thread via a single control channel
• Multiple reactors support — run several poll_loop instances in different threads
• Per-operation timeouts — each operation can have an independent deadline
• Useful helpers - manual implementations of byte swapping and DNS RFC 1035 request / response
• Simplicity — ~600 lines of code, easy to integrate

Link with flags:

• Windows: -lws2_32
• Solaris: -lsocket

Notes

• examples are in main.c
• on Windows if WSApoll() isn't exist then have auto fallback to select()
• on UNIX if poll() isn't exist then it have fallback to select with -DPOLL_BY_SELECT flag