RDMA_GET_SRC_PORT(3)

✨ RDMA_GET_SRC_PORT ✨

okay bestie, welcome to the rdma_get_src_port page from the Librdmacm Programmer's Manual 💖 this one is short, sweet, and honestly iconic — it's the "hey what port am I even on??" function. let's go 🦋

🌸 NAME 🌸

rdma_get_src_port — returns the local port number of a bound rdma_cm_id.

like... literally that's the whole thing. it hands you back the local port. no cap 💅

🎀 SYNOPSIS 🎀

#include <rdma/rdma_cma.h>

uint16_t rdma_get_src_port (struct rdma_cm_id *id);

look at her. one include, one function, zero drama ✨

🫶 ARGUMENTS 🫶

• id — the RDMA identifier. this is your rdma_cm_id, the main character of every RDMA cm story 🌈

💜 DESCRIPTION 💜

so here's the vibe: this function returns the local port number for an rdma_cm_id that has been bound to a local address.

that's it. that's the function. if you've already bound your id to a local address, this tells you which local port you're sitting on. lowkey essential, highkey simple 🌸

ngl though — the "bound to a local address" part is doing a LOT of work in that sentence. peep RETURN VALUE below before you go assuming things 👀

👑 RETURN VALUE 👑

it returns the 16-bit port identifier associated with the local endpoint. slay 💅

but — and this is the part everyone skips — if the rdma_cm_id is not bound to a port, the returned value is 0.

so if you're staring at a 0 and going "bestie why 😭" — it's not a bug, it's just not bound. go bind it (rdma_bind_addr(3) is right there in SEE ALSO, iykyk) 🧚

🔥 SEE ALSO 🔥

• rdma_bind_addr(3)
• rdma_resolve_addr(3)
• rdma_get_dst_port(3)
• rdma_get_local_addr(3)
• rdma_get_peer_addr(3)

the whole friend group honestly 🫶 go read them together, they make so much more sense as a squad ✨

and that's the page!! this absolute banger of a manual page comes to you from librdmacm, dated 2007-05-15 — yes she's been serving since 2007 and she has not missed a day 💖🎀 mwah, ily, go bind your ports ⭐