struct_size(9)

struct_size(9) 🎀 — Kernel API Manual, bestie edition ✨

💖 NAME 💖

okay so struct_size — calculate the size of a structure with a trailing array. that's the whole assignment, bestie. periodt. 💅

✨ SYNOPSIS ✨

struct_size (p , member , n );

🦋 ARGUMENTS 🦋

• p — pointer to the structure. main-character pointer energy, honestly.
• member — name of the array member. yes, the actual member name, no cap.
• n — number of elements in the array. count 'em. 🔥

🌸 DESCRIPTION 🌸

It calculates the size of memory needed for structure p followed by an array of n member elements. that's it, that's the function. lowkey iconic for not making you do the math yourself. 🧚

💀 RETURN 💀

It returns the number of bytes needed, or SIZE_MAX on overflow. yep, overflow gets the dramatic SIZE_MAX treatment. 🚨

🌈 SEE ALSO 🌈

• Kernel file ./tools/include/linux/overflow.h
• size_mul(9)
• array_size(9)
• array3_size(9)

go be nosy and read those too, iykyk. 🫶

xoxo, struct_size(9) 💖 — source/version ./tools/include/linux, Kernel API Manual, October 2026 🎀