[runlevel1]

That reminds me of something I've wanted for quite a while:

A ringbuffer filetype. Similar to a named pipe file (see: fifo(7)[^1]), but without consuming the contents on read and automatically rotating out the oldest lines.

Of course, there would be some complexities around handling read position as lines are being rotated out from under you.

[1]: https://linux.die.net/man/7/fifo

[naikrovek]

> Of course, there would be some complexities around handling read position as lines are being rotated out from under you.

that seems solvable to me, but multiple simultaneous readers... that seems like it might be a bit more challenging...

[speed_spread]

Only allow sequential reads. Each reader gets it's own cursor. If writer catches up to slowest reader (buffer full) it bumps it up before it writes. Clients can query current cursor position to know if they've been bumped. Or something like that.