socket_mcttl4(3)

💖 NAME 💖

socket_mcttl4 — okay bestie, this one sets the multicast ttl 🌸

✨ SYNTAX ✨

#include <libowfat/socket.h>

int socket_mcttl4(int s,char TTL);

That's the whole thing. Cute, right? 🎀

🦋 DESCRIPTION 🦋

So like, socket_mcttl4 sets the TTL of outgoing multicast packets on the socket s. TTL = time to live, iykyk.

The way it works is: every router that touches the packet decrements the packet TTL by one, and if the TTL hits zero it just discards the packet 💀. Gone. Not coming back. Periodt.

Which means TTL is basically a vibe check on how far your packet is allowed to travel. Set the TTL to 1, for example, and the packet propagation gets limited to the LAN — it literally cannot leave the building 🏠✨. So local. So cozy.

And if something goes wrong? socket_mcttl4 returns -1, and sets errno appropriately. So check that errno, bestie, it's telling you what happened 🙈.

👑 SEE ALSO 👑

• socket_mcttl6(3) — the v6 sibling, same energy 💅
• socket_mcjoin4(3) — join the multicast party 🎉
• socket_mcleave4(3) — and this is your exit, bestie 🚪

and that's the whole page!! this was socket_mcttl4(3) from the Library Functions Manual, mwah 🫶 go set some ttls responsibly, ily 💜