PR_GET_IO_FLUSHER(2const)

💖 PR_GET_IO_FLUSHER 💖

okay bestie, pull up a chair, we're reading the PR_GET_IO_FLUSHER page from Linux man-pages, section 2const 🎀

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✨ NAME ✨

PR_GET_IO_FLUSHER — literally just peeks at your IO_FLUSHER state. that's the whole job. no cap. 💅

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📚 LIBRARY 📚

Standard C library, aka libc, link it with -lc. the basics, the bread and butter, the moment 🫶

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🌸 SYNOPSIS 🌸

#include <linux/prctl.h>  /* Definition of PR_* constants */
#include <sys/prctl.h>

int prctl(PR_GET_IO_FLUSHER, 0L, 0L, 0L, 0L);

so like, you include both of those headers, the linux/prctl.h one is where all the PR_* constants are defined (iykyk), and then you hit prctl with PR_GET_IO_FLUSHER as the first arg and a whole lotta zeroes chilling in the rest of the slots. four of them. 0L each. she's simple like that 💜

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🦋 DESCRIPTION 🦋

okay so here's the tea ☕ this call returns the IO_FLUSHER state of the caller. as in, you. the one calling it. it's giving vibe check but for your own flusher status.

the value it hands back:

• 1 — you ARE in the IO_FLUSHER state 👑
• 0 — you are NOT in the IO_FLUSHER state 🙈

that's it. boolean behaviour, no in-between, no "maybe", no "it's complicated". periodt.

⚠️ important bestie — the calling process must have the CAP_SYS_RESOURCE capability. no cap (well, yes cap, that's literally the point 😭). no capability, no answer.

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🌈 RETURN VALUE 🌈

on success? she returns that boolean value we just talked about — the 1 or the 0, the yes or the no, the slay or the not-slay ✨

on error? -1 comes back at you and errno gets set to tell you what went wrong. classic. iconic. never changes 💀

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⭐ STANDARDS ⭐

Linux. that's it, that's the standard. 🐧

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🎀 HISTORY 🎀

Linux 5.6. she's been around since 5.6, a whole era, a legend fr fr 💖

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👀 SEE ALSO 👀

• prctl(2)
• PR_SET_IO_FLUSHER(2const)

like yeah, go check the setter if you wanna change your flusher state instead of just snooping on it. they're a matching pair, a duo, main character energy together 🫶

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and that's the whole page, bestie — no crumbs left behind 💅✨

this lil tour was brought to you by Linux man-pages 6.20, dated 2026-02-08, and the letters P, R, and _ 🎀 go forth and query your flusher state, you absolute icon 🌸🦋