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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | STANDARDS | HISTORY | SEE ALSO | COLOPHON |
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PR_SET_CHILD_SUBREAPER(2const) PR_SET_CHILD_SUBREAPER(2const)
PR_SET_CHILD_SUBREAPER - set/unset the "child subreaper" attribute
of the calling process
Standard C library (libc, -lc)
#include <linux/prctl.h> /* Definition of PR_* constants */
#include <sys/prctl.h>
int prctl(PR_SET_CHILD_SUBREAPER, long set);
If set is nonzero, set the "child subreaper" attribute of the
calling process; if set is zero, unset the attribute.
A subreaper fulfills the role of init(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 to
getppid(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 a SIGCHLD signal and will be
able to wait(2) on the process to discover its termination status.
The setting of the "child subreaper" attribute is not inherited by
children created by fork(2) and clone(2). The setting is
preserved across execve(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). Some init(1) frameworks
(e.g., systemd(1)) employ a subreaper process for similar reasons.
On success, 0 is returned. On error, -1 is returned, and errno is
set to indicate the error.
Linux.
Linux 3.4.
prctl(2), PR_GET_CHILD_SUBREAPER(2const)
This page is part of the man-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
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⟨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-
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part of the original manual page), send a mail to
[email protected]
Linux man-pages 6.15 2025-05-17 PR_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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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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