socket_quickack(3)

💖 socket_quickack — the manual, but make it make sense 💖

okay bestie, we're looking at socket_quickack(3) from the Library Functions Manual, and honestly? it's giving "tiny function, big networking energy" and i am obsessed. it's the one that flips TCP Quick ACK mode on or off. that's it. that's the whole job. and it slays at it. ✨

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🌸 NAME 🌸

socket_quickack — turn TCP Quick ACK mode on or off

like. the name literally says what it does. no cap. 👑

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🎀 SYNTAX 🎀

#include <libowfat/socket.h>

int socket_quickack(int s,int value);

so you pull in the header from libowfat, and you hand it two ints: your socket s, and a value that's your on/off switch. simple. clean. iconic. 💅

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✨ DESCRIPTION ✨

so here's the tea, bestie. socket_quickack switches TCP Quick ACK mode on (value=1) or off (value=0).

⚠️ plot twist: if the platform you're on doesn't support this functionality, it returns -1 and sets errno to ENOPROTOOPT — or to ENOSYS if the platform doesn't even define ENOPROTOOPT. so like, check your errno, she's telling you things. 😭

now, why would you even care? okay so:

TCP Quick ACK mode is on by default, and that's because the operating system has to assume it's an interactive connection. in that case, an ACK gets sent quickly right after data comes in. makes sense for interactive stuff, right? of course it does. 🫶

but — and this is the main character moment — if your code handles non-interactive server connections, it may make sense to switch Quick ACK mode off. why? because you're telling the kernel to delay sending ACKs, since the server is gonna respond to the incoming requests anyway. so the ACK can be piggy-backed onto that response, which saves useless network traffic. efficiency?? we love her. 🔥

Normally socket_quickack returns 0. if anything goes wrong, it returns -1 and sets errno appropriately. that's the whole vibe check. ✅

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🌈 EXAMPLE 🌈

#include <libowfat/socket.h>

int s;
char ip[4];
uint16 p;

s = socket_tcp4b();
socket_quickack(s);
socket_bind4_reuse(s,ip,p);
socket_listen(16);

look at that flow. socket, quickack, bind4_reuse, listen. she's doing the whole routine and she's doing it flawlessly. 🎀

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💜 SEE ALSO 💜

• socket_fastopen(3)

go read that one too, bestie, it's in the same friend group. 🦋

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okay so that's the whole page! slay. this lil beauty lives in the Library Functions Manual, and the page signs off as socket_quickack(3) — no date on this one, she's timeless like that. ✨💖 periodt. 🌸