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add O_NONBLOCK cross-platform pattern to 0.16 migration notes
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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languages/ziglang/0.16/migration.md
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languages/ziglang/0.16/migration.md
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const q: i32 = std.math.cast(i32, q_raw) orelse return error.EpollError;
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```
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### O_NONBLOCK cross-platform
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never hardcode `O_NONBLOCK` — it differs per platform (macOS `0x0004`, Linux `0o4000`). use zig's typed packed struct:
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```zig
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const libc = std.c;
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const O_NONBLOCK: c_int = @bitCast(libc.O{ .NONBLOCK = true });
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// usage with fcntl
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const flags = libc.fcntl(fd, libc.F.GETFL);
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_ = libc.fcntl(fd, libc.F.SETFL, flags | O_NONBLOCK);
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```
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`libc.O` is a `packed struct(u32)` that varies by `native_os` — `@bitCast` gives the correct integer for the target platform.
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## networking
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`std.net` is gone. use `Io.net`: