PR_GET_FPEMU(2const)

💖 PR_GET_FPEMU 💖

okay bestie, welcome to the PR_GET_FPEMU(2const) page — yes it's a 2const situation, we're in the prctl-constants corner of the man-pages universe and it's lowkey adorable in here 🎀

This is the one where you ask the kernel hey, what are the floating-point emulation control bits looking like rn? and the kernel tells you. That's the whole vibe. Slay.

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📚 LIBRARY 📚

Standard C library (libc, -lc) 🫶

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✨ SYNOPSIS ✨

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

int prctl(PR_GET_FPEMU, int *fpemu);

Like, look at that second header comment. Do not skip it. Those PR_* constants live in there and the kernel is not gonna guess for you 🙈

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🌸 DESCRIPTION 🌸

So here's the tea: PR_GET_FPEMU returns the floating-point emulation control bits, and it drops them right into the location that fpemu points to. That's it. That's the whole function. Main character energy, minimal plot, no cap 💅

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🫶 RETURN VALUE 🫶

• On success, 0 is returned. 🎉
• On error, -1 is returned, and errno is set to indicate the error. 😭

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💀 ERRORS 💀

• EFAULT — fpemu is an invalid address. Like bestie, you handed it a pointer to nowhere. The kernel is not amused. Fix your address, periodt.

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👑 STANDARDS 👑

Linux. ia64 only. So if you're on literally any other architecture... this isn't your moment, sorry not sorry 🌈

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🕰️ HISTORY 🕰️

Linux 2.4.18, 2.5.9. (ia64) — vintage behaviour, still iconic ✨

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👀 SEE ALSO 👀

• prctl(2)
• PR_SET_FPEMU(2const)

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no cap: if you're not on ia64, this page is basically a museum exhibit 🦋

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anddd that's a wrap, my love 💜 this page came from Linux man-pages 6.20, dated 2026-02-08 — go forth and get those FPE emulation bits, you absolute legend ⭐🎀