memset_startat(9)

💖 memset_startat(9) 💖

ok so you're in the memset_startat(9) page, which lives in the Kernel API Manual — welcome bestie, this one's short and sweet 🍓

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✨ NAME ✨

memset_startat — set a value starting at a member to the end of a struct. literally just fills from that member onward 💅

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🌸 SYNOPSIS 🌸

memset_startat (obj , v , member );

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🎀 ARGUMENTS 🎀

• obj — the address of the target struct instance. yes, the actual struct, not a vibe 🫶
• v — the byte value you want to repeatedly write. over and over and over ✨
• member — the struct member to start writing at. everything from here to the end of the struct gets the treatment 👑

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🦋 DESCRIPTION 🦋

okay so listen, this is the important bit 👀 — if there's padding sitting between the prior member and the target member, you should be using memset_after to clear that prior padding instead. no cap, that's the whole caveat 💀

like… don't just start at the member and hope. if there's padding before it, memset_after is your girl 🧚

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🌈 SEE ALSO 🌈

Kernel file ./include/linux/string.h has all the friends, and they are:

• memdup_array_user(9)
• vmemdup_array_user(9)
• strscpy(9)
• strscpy_pad(9)
• mem_is_zero(9)
• sysfs_match_string(9)
• memzero_explicit(9)
• kbasename(9)
• strtomem_pad(9)
• strtomem(9)
• memtostr(9)
• memtostr_pad(9)
• memset_after(9)
• str_has_prefix(9)
• strstarts(9)
• strends(9)

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that's the whole page bestie, go clear some structs 💜

— signed, sealed, delivered from ./include/linux, October 2026, memset_startat(9), mwah 😭💅