PR_GET_CHILD_SUBREAPER(2const)

✨ PR_GET_CHILD_SUBREAPER 💖

okay bestie, so this is a page from the Linux man-pages (the 2const girlies, you know the ones). We're talking about PR_GET_CHILD_SUBREAPER — a lil prctl operation that lets you peek at the "child subreaper" attribute of whatever process is doing the asking. 👑

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🎀 NAME 🎀

PR_GET_CHILD_SUBREAPER — get the "child subreaper" attribute of the calling process

like. it literally just reads the vibe of your own subreaper setting back to you. no cap. 💅

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📚 LIBRARY 📚

Standard C library (libc, -lc)

yes bb, the regular one. nothing fancy. 🫶

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🦋 SYNOPSIS 🦋

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

int prctl(PR_GET_CHILD_SUBREAPER, int *isset);

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🌸 DESCRIPTION 🌸

okay so here's the tea: this call returns the "child subreaper" setting of the caller, and it drops that answer into the location pointed to by isset. ✨

that's it. that's the whole function. she's simple, she's iconic, she's not doing too much. 🙈

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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 — isset is an invalid address. like girl, that pointer is not it. 💀

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👑 STANDARDS 👑

Linux. (just Linux, bestie — she's a Linux exclusive. iykyk) 🌈

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🕰️ HISTORY 🕰️

Linux 3.4. so she's been around, she's got main character energy from day one. ⭐

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🔥 SEE ALSO 🔥

• prctl(2)
• PR_SET_CHILD_SUBREAPER(2const)

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and that's the whole page bb, no notes 💅

this slay was brought to you by Linux man-pages 6.20, dated 2026-02-08, giving PR_GET_CHILD_SUBREAPER(2const) real estate in the terminal since forever. periodt. 💖✨🎀