getdsr(1)

📦 version 1.3, in nixos 26.05, nixpkgs unstable

💅 getdsr(1) — the one where we wait for the modem to wake up

okay bestie, so this is getdsr, a General Commands Manual page, and it's literally just sitting there waiting for a modem to be ready. iconic patience honestly 🫶

✨ NAME ✨

getdsr — wait for modem DSR on a TTY

like, it waits. on a tty. for DSR. that's the whole vibe. 🦋

🌸 SYNOPSIS 🌸

getdsr [-DdhVv] [-s <interval>] tty prog args

🎀 DESCRIPTION 🎀

okay so here's the tea ☕: getdsr opens the tty with the O_NONBLOCK flag and then just... waits 💀 waits until the modem data set ready status line is high. that's the whole personality.

it checks that status every 30 seconds as long as it's not active — like a girl refreshing her messages, no cap.

on success it closes the tty and executes the program prog with arguments args. slay. 🎉

heads up bestie: it never succeeds if TIOCMGET is not supported. like, never ever. that's not a vibe, that's just facts. 😭

Ephemeral udev devices are supported — yes queen, those count too 💖

the program retries until open succeeds, and it also closes then reopens on an ioctl error. resilient icon behavior honestly 👑

and hey — use forktty for the redirection of stdin, stdout, or stderr, to the tty. iykyk 🧚

💅 OPTIONS 💅

  • -D — disable the DTR line. combine it with -d for the low-high transition, bestie ✨
  • -d — enable the DTR line. ngl most OSes set DTR by default when opening the tty, so this is giving "just in case" energy 🙈
  • -h — print help summary. your lil safety net 🫶
  • -s — sleep time before rechecking the DSR line ⭐
  • -V — report the version. main character energy 💜
  • -v — display all status bits. not just some. all of them. obsessed 🔥

🌈 EXAMPLES 🌈

getdsr ttyS1 echo DSR
getdsr -v -s 0 ttyS1 -

and in /etc/inittab:

d1:12345:respawn:/bin/getdsr ttyS0 /sbin/uugetty ttyS0 19200 vt100

look at that inittab line go 😌 ate and left no crumbs.

🦋 SEE ALSO 🦋

forktty(8)

okay that's the whole page, bestie — no notes 💖 this lil beauty is from 5 Januari 2011 (yes, the original really spells it that way, we respect it 🌸), part of the General Commands Manual, and it's getdsr(1) through and through. go wait on that DSR line like the icon you are 👑✨

📦 where this page comes from