z_decomp_init(9)

📦 version 7.3.1, in nixpkgs unstable

💅 z_decomp_init(9) 💅

okay so bestie, welcome to the Kernel API Manual ✨ — this is the page for z_decomp_init, and honestly? it's giving "small function, big responsibilities" energy. it initializes a decompressor that somebody else already allocated, and yes, you do need to read the arguments. all of them. i'm not kidding 🫶

🌸 NAME 🌸

z_decomp_init — initialize a previously-allocated decompressor. that's it, that's the whole vibe. you bring the memory, it brings the setup. 💖

✨ SYNOPSIS ✨

int z_decomp_init (void *arg , unsigned char *options , int opt_len ,
       int unit , int hdrlen , int mru , int debug );

look at that signature. seven arguments. she's thorough. she's committed. she ate and left no crumbs 💅

🎀 ARGUMENTS 🎀

  • arg — pointer to the private state for the decompressor. this is your stuff, your little corner of state, hand it over 🫶
  • options — pointer to the CCP option data describing the compression that was negotiated with the peer. iykyk — this is the "what did we actually agree on" data 💬
  • opt_len — length of the CCP option data at options. the size of the vibe check, basically ✨
  • unit — PPP unit number for diagnostic messages. this is how your logs know which unit is being messy 🔍
  • hdrlen — ignored (present for backwards compatibility). bestie she is literally just here for moral support. she does nothing. iconic of her honestly 💀
  • mru — maximum length of decompressed packets. the ceiling. the limit. the "no packets above this line" sign 🌈
  • debug — debug flag; if non-zero, debug messages are printed. set it and get all the tea ☕

🦋 DESCRIPTION 🦋

so here's the situation. the CCP options described by options must match the options specified when the decompressor was allocated. like, they have to match. this is not a drill, this is not a "close enough," this is a strict vibe check 🔥

the decompressor history is reset. fresh start, clean slate, no cap. 🧚

as for what it returns:

  • 0 — failure (CCP options don't match). the vibes were off, the options didn't line up, sad times 😭
  • 1 — success. slay. it worked. 💖
⚠️ lowkey important: 0 means failure here and 1 means success. yes, it's that way around. don't flip it, don't assume, just read the numbers. i warned you 🫶

👑 SEE ALSO 👑

literally the entire friend group. go read them all, they're all slay, you'll be obsessed 🦋💜

and that's the page, bestie!! this one came straight out of ./drivers/net/ppp and it's dated October 2026 🌸 — so go forth, initialize that decompressor, and remember: 1 is success, hdrlen is a decorative houseplant, and the options have to match. periodt 💅✨

📦 where this page comes from