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PR_SET_CHILD_SUBREAPER(2const) — Linux manual page

PR_SET_CHILD_SUBREAPER(2const)PR_SET_CHILD_SUBREAPER(2const)

NAME        top

       PR_SET_CHILD_SUBREAPER - set/unset the "child subreaper" attribute       of the calling process

LIBRARY        top

       Standard C library (libc,-lc)

SYNOPSIS        top

#include <linux/prctl.h>/* Definition ofPR_*constants */#include <sys/prctl.h>int prctl(PR_SET_CHILD_SUBREAPER, longset);

DESCRIPTION        top

       Ifset is nonzero, set the "child subreaper" attribute of the       calling process; ifset is zero, unset the attribute.       A subreaper fulfills the role ofinit(1) for its descendant       processes.  When a process becomes orphaned (i.e., its immediate       parent terminates), then that process will be reparented to the       nearest still living ancestor subreaper.  Subsequently, calls togetppid(2) in the orphaned process will now return the PID of the       subreaper process, and when the orphan terminates, it is the       subreaper process that will receive aSIGCHLDsignal and will be       able towait(2) on the process to discover its termination status.       The setting of the "child subreaper" attribute is not inherited by       children created byfork(2) andclone(2).  The setting is       preserved acrossexecve(2).       Establishing a subreaper process is useful in session management       frameworks where a hierarchical group of processes is managed by a       subreaper process that needs to be informed when one of the       processes—for example, a double-forked daemon—terminates (perhaps       so that it can restart that process).  Someinit(1) frameworks       (e.g.,systemd(1)) employ a subreaper process for similar reasons.

RETURN VALUE        top

       On success, 0 is returned.  On error, -1 is returned, anderrno is       set to indicate the error.

STANDARDS        top

       Linux.

HISTORY        top

       Linux 3.4.

SEE ALSO        top

prctl(2),PR_GET_CHILD_SUBREAPER(2const)

COLOPHON        top

       This page is part of theman-pages (Linux kernel and C library       user-space interface documentation) project.  Information about       the project can be found at        ⟨https://www.kernel.org/doc/man-pages/⟩.  If you have a bug report       for this manual page, see       ⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.       This page was obtained from the tarball man-pages-6.15.tar.gz       fetched from       ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on       2025-08-11.  If you discover any rendering problems in this HTML       version of the page, or you believe there is a better or more up-       to-date source for the page, or you have corrections or       improvements to the information in this COLOPHON (which isnot       part of the original manual page), send a mail to       man-pages@man7.orgLinux man-pages 6.15            2025-05-17PR_SET_CHILD_SUBREAPER(2const)

Pages that refer to this page:prctl(2), PR_GET_CHILD_SUBREAPER(2const), PR_SET_PDEATHSIG(2const)

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