UMAD_ALLOC(3)

✨ UMAD_ALLOC — allocate memory for umad buffers ✨

okay bestie, welcome to the umad_alloc(3) page from the OpenIB Programmer's Manual 💖 this one's short and sweet, but it's lowkey important, so let's get into it 🫶

🌸 SYNOPSIS 🌸

#include <infiniband/umad.h>

void * umad_alloc(int num, size_t size);

💅 DESCRIPTION 💅

so like, umad_alloc() does exactly what it says on the tin: it allocates memory for an array of num umad buffers, each one size bytes big 🎀

but here's the part you actually need to clock, bestie — size is NOT just the payload size. it has to include umad_size() plus the length. and that length is:

• MAD_BLOCK_SIZE for your normal, regular-degular MADs 🌈
• the length that umad_recv() handed back to you, if you're dealing with RMPP MADs 🦋

so basically: don't just pass the data length and call it a day. add the umad_size() on top or it's giving "why is my buffer broken" energy 😭

🎀 RETURN VALUE 🎀

umad_alloc() returns NULL if it's out of memory. that's the whole thing. no fancy error codes, no secrets, just NULL. so like… check for it, okay? 🙈

👑 SEE ALSO 👑

• umad_free(3) — yes queen, you gotta free what you allocate, we don't do leaks in this house 💀

⭐ AUTHOR ⭐

Hal Rosenstock <halr@voltaire.com> — iconic behavior, we love a legend 🫶

and that's the whole vibe, bestie ✨ this little page came to you from the OpenIB crew, dated May 21, 2007, and it lives in the UMAD_ALLOC(3) section of the manual. go forth and allocate responsibly 💖🌸🎀