libnvmf_connect_args_emit(9)

💅 libnvmf_connect_args_emit (libnvme API manual, bestie!)

okay so picture this: you've got a connection and you want it to look like a bunch of nvme connect options. that's literally this function's whole job. it's in the libnvme API manual and it's lowkey iconic.

---

✨ SYNOPSIS ✨

int libnvmf_connect_args_emit (const struct libnvmf_tid *tid , const
       struct libnvmf_params *params , void (*callback)(const char *arg, void
       *user_data) , void *user_data );

no cap, that's the whole signature. and yes you have to pass that callback, we'll get to it 🫶

---

🎀 ARGUMENTS 🎀

• tid — the addressing + identity situation, or NULL if you literally just want the parameters emitted and nothing else. your choice bestie 💅
• params — the connection parameters, or NULL to emit, like, only the TID. pick a lane (or don't, both are valid).
• callback — called once per formatted option, e.g. "--transport=tcp". ⚠️ heads up: the string is only valid for the duration of the call — do not go storing it, do not go keeping a pointer to it, it will not be there later fr fr.
• user_data — your own caller context, passed straight through to callback. it's giving "your stuff, your rules" 🦋

---

🌸 DESCRIPTION 🌸

so the way this works: it emits the TID's set fields first, in a fixed order (not vibes-based, fixed, bestie):

1. --transport
2. --traddr
3. --trsvcid
4. --nqn
5. --host-traddr
6. --host-iface
7. --hostnqn
8. --hostid

then it does the parameters, in their iteration order. periodt. ✨

unset and reset parameters get skipped entirely, so the kernel default just applies — real "if you don't have anything to say, don't say anything" energy. and a boolean parameter? when it's true it's emitted as a bare --flag, and when it's false it's skipped. that's it, that's the whole rule 💀

consumer-private options are the caller's to append. the function is not doing that for you, bestie — that part is yours 👑

and like, what is this actually for? two things, and both slay:

• this is the consumption path for the resolved configuration — every single connection becomes the option list of one nvme connect invocation. one connection, one invocation. matchy matchy 🌈
• it also renders a connection as a human-readable, copy-pasteable command line, for config show style output. so you can literally show your friends and they can paste it. main character energy 👑

---

⭐ RETURN ⭐

• 0 — on success 🎉
• -EINVAL — when callback is NULL. yeah. you need the callback. we said that 😭
• -ENOMEM — when formatting an option fails, and the emission stops right there. not "keeps going and hopes", it stops. so check your return value, okay? 🙈

---

💖 sign-off 💖

this lil' page was brought to you by the libnvme API manual, dated October 2026 — go forth and emit your options, bestie, you're gonna do amazing 🧚‍♀️💜🌸