NNG_MSG_HEADER(3)

💖 NNG_MSG_HEADER(3) 💖

okay so bestie, this is a page from the NNG Reference Manual, and it's literally about one tiny function that hands you the header of a message. that's it. that's the whole vibe. let's get into it 🫶

---

✨ NAME ✨

nng_msg_header — return message header

---

🌸 SYNOPSIS 🌸

#include <nng/nng.h>

void *nng_msg_header(nng_msg *msg);

like. one line. one include. we love a minimalist queen 👑

---

🦋 DESCRIPTION 🦋

so nng_msg_header() returns a pointer to the start of the header content of the message msg. that's it, that's the function, she's simple and she knows it ✨

Note 🎀 the message header holds protocol-specific header content. most applications should not need to touch this content at all — like, it's not for you, ngl. but it is available for raw mode sockets, the ones you set with the NNG_OPT_RAW option. iykyk.

Note 💀 the value returned by this gets invalidated by a call to any of the functions that modify the message or the header content. so like… don't hold onto it, bestie. it's giving "here for a good time not a long time". any mutation and it's over 🙈

---

💅 RETURN VALUES 💅

a pointer to the start of the message header. periodt.

---

🌈 ERRORS 🌈

None. not a single one. she simply cannot fail, and honestly? iconic 👑

---

⭐ SEE ALSO ⭐

• nng_msg_alloc(3)
• nng_msg_body(3)
• nng_msg_free(3)
• nng_msg_header_append(3)
• nng_msg_header_chop(3)
• nng_msg_header_insert(3)
• nng_msg_header_len(3)
• nng_msg_header_trim(3)
• nng_msg(5)
• nng(7)

---

and that's the whole page bestie, no cap 💖 this one dropped on 2026-06-30 as part of the NNG Reference Manual — NNG_MSG_HEADER(3), still serving header-pointer realness to this very day. slay 🎀✨🦋