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PR_SET_IO_FLUSHER(2const) — Linux manual page

PR_SET_IO_FLUSHER(2const)PR_SET_IO_FLUSHER(2const)

NAME        top

       PR_SET_IO_FLUSHER - change the IO_FLUSHER state

LIBRARY        top

       Standard C library (libc,-lc)

SYNOPSIS        top

#include <linux/prctl.h>/* Definition ofPR_*constants */#include <sys/prctl.h>int prctl(PR_SET_IO_FLUSHER, longstate, 0L, 0L, 0L);

DESCRIPTION        top

       If a user process is involved in the block layer or filesystem I/O       path, and can allocate memory while processing I/O requests it       must setstate to 1.  This will put the process in the IO_FLUSHER       state, which allows it special treatment to make progress when       allocating memory.  Ifstate is 0, the process will clear the       IO_FLUSHER state, and the default behavior will be used.       The calling process must have theCAP_SYS_RESOURCEcapability.       The IO_FLUSHER state is inherited by a child process created viafork(2) and is preserved acrossexecve(2).       Examples of IO_FLUSHER applications are FUSE daemons, SCSI device       emulation daemons, and daemons that perform error handling like       multipath path recovery applications.

RETURN VALUE        top

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

ERRORS        top

EINVALstate is not a valid value.

STANDARDS        top

       Linux.

HISTORY        top

       Linux 5.6.

SEE ALSO        top

prctl(2),PR_GET_IO_FLUSHER(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_IO_FLUSHER(2const)

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

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