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inotify_init(2) — Linux manual page

inotify_init(2)            System Calls Manualinotify_init(2)

NAME        top

       inotify_init, inotify_init1 - initialize an inotify instance

LIBRARY        top

       Standard C library (libc,-lc)

SYNOPSIS        top

#include <sys/inotify.h>int inotify_init(void);int inotify_init1(intflags);

DESCRIPTION        top

       For an overview of the inotify API, seeinotify(7).inotify_init() initializes a new inotify instance and returns a       file descriptor associated with a new inotify event queue.       Ifflags is 0, theninotify_init1() is the same asinotify_init().       The following values can be bitwise ORed inflags to obtain       different behavior:IN_NONBLOCK              Set theO_NONBLOCKfile status flag on the open file              description (seeopen(2)) referred to by the new file              descriptor.  Using this flag saves extra calls tofcntl(2)              to achieve the same result.IN_CLOEXEC              Set the close-on-exec (FD_CLOEXEC) flag on the new file              descriptor.  See the description of theO_CLOEXECflag inopen(2) for reasons why this may be useful.

RETURN VALUE        top

       On success, these system calls return a new file descriptor.  On       error, -1 is returned, anderrno is set to indicate the error.

ERRORS        top

EINVAL(inotify_init1()) An invalid value was specified inflags.EMFILEThe user limit on the total number of inotify instances has              been reached.EMFILEThe per-process limit on the number of open file              descriptors has been reached.ENFILEThe system-wide limit on the total number of open files has              been reached.ENOMEMInsufficient kernel memory is available.

STANDARDS        top

       Linux.

HISTORY        top

inotify_init()              Linux 2.6.13, glibc 2.4.inotify_init1()              Linux 2.6.27, glibc 2.9.

SEE ALSO        top

inotify_add_watch(2),inotify_rm_watch(2),inotify(7)

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            2025-05-17inotify_init(2)

Pages that refer to this page:inotify_add_watch(2), inotify_rm_watch(2), syscalls(2), proc_pid_fd(5), inotify(7)

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