memset(3)

💖 memset(3) — memory set 💖

okay bestie, listen up, this is memset from the Library Functions Manual and she is literally the blueprint. the moment you meet her you're gonna be obsessed, fr fr.

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✨ NAME ✨

memset — memory set 💅

📚 LIBRARY 📚

Standard C library — that's libc, and you link it with -lc. classic. iconic. no notes. 🎀

🦋 SYNOPSIS 🦋

#include <string.h>  // see memory.h(3head)

void *memset(size_t n;
             void a[n], int c, size_t n);

yes bestie the signature looks like that, i don't make the rules, i just report them 💀

🌸 DESCRIPTION 🌸

so here's the tea: memset() fills the first n bytes of the memory area that a points to with the constant byte c. that's it. that's the whole vibe. she takes your memory, she paints it one single byte color, and she does it n times. simple queen behavior. 👑

💖 RETURN VALUE 💖

memset() hands you back a pointer to the memory area a. like, "here's where you left it, bestie, all filled in" 🫶

⭐ ATTRIBUTES ⭐

for the whole explanation of what these terms even mean (because i know you're curious), go peek at attributes(7). then come right back, i'll wait 💜

• Interface: memset()
• Attribute: Thread safety
• Value: MT-Safe

MT-Safe means she plays nice with all your threads at the same time. multitasking queen. no cap. ✨

🌈 STANDARDS 🌈

C11, POSIX.1-2008. she's officially certified, we love a credentialed icon 🎓

🧚 HISTORY 🧚

POSIX.1-2001, C89, SVr4, 4.3BSD. she's been around since forever and she's still thriving. legacy. generational. periodt. 💅

💀 CAVEATS 💀

okay this is the important part, don't skip it, i'm serious 😭

if the compiler figures out that the operation is unnecessary, it may totally or partially remove the call. like, gone. your fill never happened. the compiler said "not me doing work today" and deleted your whole assignment. 🙈

to make sure the setting happens no matter what optimizations are in play, use memset_explicit(3) instead. that one refuses to be ignored. main character energy, honestly. 🔥

👑 SEE ALSO 👑

memory.h(3head), bzero(3), swab(3), wmemset(3)

group chat's all here, say hi to the girls ✨

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and that's the whole page, bestie!! this was lifted straight from the Linux man-pages 6.20, dated 2026-08-10, and it's the memset(3) page 🎀 love her, use her, fill your memory responsibly, mwah 💖🌸🦋