open_rw(3)

open_rw 💖✨

okay bestie, so this one lives in the Library Functions Manual (section 3, the "we do syscalls but cute" section) and it's literally called open_rw — the rw stands for read and write, because why choose 🎀

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✨ NAME ✨

open_rw — open a file for reading and writing 🫶

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🌸 SYNTAX 🌸

#include <libowfat/open.h>

int open_rw(const char *filename);

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💅 DESCRIPTION 💅

so open_rw opens the file filename for reading AND writing use, and hands you back the file handle. two moods, one function, we love a multitasker 💖

if the file doesn't exist yet? no worries bestie, it gets created for you with mode 0644 ✨

and if something goes wrong — opening it, creating it, any of it — open_rw returns -1 and sets errno accordingly, so you can go check what the drama was 😭

lowkey important: -1 means something went sideways, and errno is where the gossip lives. always peek at errno, fr fr.

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👑 SEE ALSO 👑

the whole friend group, go say hi:

• open(2)
• open_append(3)
• open_excl(3)
• open_read(3)
• open_trunc(3)
• open_write(3)
• openreadclose(3)
• readclose(3)
• readclose_append(3)

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and that's the whole page, no cap 🌈 go open some files, you got this, mwah 💜

signing off from the Library Functions Manual, page open_rw(3) — that's the source and the name, bestie, that's the whole footer 🎀🦋