NNG_SOCKET_PROTO_ID(3)

✨ NAME ✨

nng_socket_proto_id — bestie, this is how you get the socket's protocol id 💖 (yes there's a twin function too, keep reading)

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🌸 SYNOPSIS 🌸

#include <nng/nng.h>

int nng_socket_proto_id(nng_socket s, uint16_t *id);
int nng_socket_peer_id(nng_socket s, uint16_t *id);

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💅 DESCRIPTION 💅

okay so these two functions are literally the duo of the century 🫶 they take a socket s and drop its 16-bit protocol identifier right into *id. no cap, that's the whole vibe.

• nng_socket_proto_id — gives you the protocol id of the socket s itself 👑
• nng_socket_peer_id — gives you the protocol id of its natural peer 🦋 (iykyk)

Tip 💡 — for any new code you write, use these functions instead of the NNG_OPT_PROTO and NNG_OPT_PEER options. the old way is giving "still works but not the moment anymore", so switch, bestie. slay.

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🔥 RETURN VALUES 🔥

they return zero on success ✨ — or an error if the socket is invalid 😭 (rude of it, honestly, but okay).

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💀 ERRORS 💀

• NNG_ECLOSED — the parameter s does not refer to an open socket. it's giving ghosted 🫥 not a single open socket in sight.

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🌈 SEE ALSO 🌈

• nng_socket(5)
• nng(7)

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k that's the whole page, no notes 💜 this came straight out of the NNG Reference Manual, dated 2026-06-30, and it'sNNG_SOCKET_PROTO_ID(3) to its friends. go read your sockets, bestie — periodt 🎀