Q_GETINFO(2const)

💖 Q_GETINFO 💖

okay bestie, so this is a 2const page, which is the fancy way of saying "this is one specific little constant you can hand to quotactl()" 💅 the real manual you want open in another tab is quotactl(2). Anyway. Buckle up 🎀

Library: it lives in the Standard C library — link with -lc, like everything else in libc 🌸

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✨ SYNOPSIS ✨

Two ways to do the thing — one through quotactl(), one straight through the syscall with an fd 🦋

#include <sys/quota.h>

int quotactl(QCMD(Q_GETINFO, type), const char *_Nullable special, 0,
             caddr_t addr);

and if you're feeling spicy and wanna go raw syscall (iykyk):

#include <sys/quota.h>    /* Definition of Q_* constants */
#include <sys/syscall.h>  /* Definition of SYS_* constants */
#include <unistd.h>

int syscall(SYS_quotactl_fd, int fd, QCMD(Q_GETINFO, type), 0,
            struct dqinfo *addr);

note those includes are doing real work — the first one brings in the Q_* constants, the second brings in the SYS_* constants, don't skip them 🙈

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🌈 DESCRIPTION 🌈

So basically: this constant asks the kernel to get information about a quotafile. Think stuff like grace times ⏳ adorable, right?

The addr argument should be a pointer to a dqinfo(2type) structure. That's where the tea gets delivered 💖

And here's the cute part — as of right now, the kernel fills in all the entries of that dqinfo(2type) structure and marks them all as valid in the .dqi_valid field. Every single one. Slay 👑

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⭐ RETURN VALUE ⭐

See quotactl(2). That's it, that's the whole section — it's all handled over there, go look 🫶

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💀 ERRORS 💀

See quotactl(2). Same energy, same page, same errors 💜

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👑 STANDARDS 👑

• Linux. That's it. Periodt.

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🕰️ HISTORY 🕰️

• Linux 2.4.22 — so this has been around for a minute, not me being born yesterday 😭 it's giving vintage, it's giving icon

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🎀 SEE ALSO 🎀

Go read these next, they're the whole friend group:

• quotactl(2)
• quotactl_fd(2)
• Q_SETINFO(2const) — the other half of this duo, the setter to this getter 💫
• dqinfo(2type)

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fr fr, don't forget: addr is a dqinfo(2type) pointer, the kernel fills in everything, and .dqi_valid says so ✨

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okay that's the whole page bestie, you understood it perfectly, highkey proud of you 💅 this was Linux man-pages 6.20, dated 2026-06-05 — mwah, love that for us 🍓✨