tmux Control Mode Is an Unauthenticated Command Channel
tmux -C gives you a scriptable protocol with zero authentication — anything that can open the socket can run run-shell.
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tmux Runs Real ptys for Every Pane
A pane isn’t a picture of a terminal — it’s a real pty with a real process behind it, in its own session.
PostgreSQL Groups Commits: How a Hundred Backends Share One fsync
Committing doesn’t fsync: backends copy WAL into shared memory and piggyback on one fsync, using LWLockAcquireOrWait so followers can observe someone else’s flush without ever …
PostgreSQL's bit and varbit Implementation in C
bit and varbit are the same varlena under the hood, and a single zero-padding invariant is what lets bit_cmp compare bit strings with a plain memcmp.
PostgreSQL's interval Implementation in C: Three Numbers That Refuse to Add Up
An interval is three numbers — months, days, microseconds — collapsed only at comparison time, which is why ‘1 month’ equals ‘30 days’ but January 31 plus one month clamps to …