#include <sys/fanotify.h>

       int fanotify_mark(int fanotify_fd, unsigned int flags,
                         uint64_t mask, int dirfd, const char *pathname);

       For an overview of the fanotify API, see fanotify(7).

       fanotify_mark(2) adds, removes, or  modifies  an  fanotify  mark  on  a
       filesystem  object.   The  caller  must  have  read  permission  on the
       filesystem object that is to be marked.

       The  fanotify_fd  argument  is  a  file  descriptor  returned  by  fan-

       flags  is  a  bit mask describing the modification to perform.  It must
       include exactly one of the following values:

              The events in mask will be added to the mark  mask  (or  to  the
              ignore  mask).   mask  must be nonempty or the error EINVAL will

              The events in argument mask will be removed from the  mark  mask
              (or  from  the ignore mask).  mask must be nonempty or the error
              EINVAL will occur.

              Remove either all mount or all non-mount marks from the fanotify
              group.   If  flags contains FAN_MARK_MOUNT, all marks for mounts
              are removed from the group.  Otherwise, all marks  for  directo-
              ries  and  files are removed.  No flag other than FAN_MARK_MOUNT
              can  be  used  in  conjunction  with  FAN_MARK_FLUSH.   mask  is

       If  none  of  the values above is specified, or more than one is speci-
       fied, the call fails with the error EINVAL.

       In addition, zero or more of the following  values  may  be  ORed  into

              If  pathname  is  a  symbolic link, mark the link itself, rather
              than the file to which it refers.  (By default,  fanotify_mark()
              dereferences pathname if it is a symbolic link.)

              If  the  filesystem  object to be marked is not a directory, the
              error ENOTDIR shall be raised.

              Mark the mount point specified by pathname.  If pathname is  not

       mask defines which events shall be listened  for  (or  which  shall  be
       ignored).  It is a bit mask composed of the following values:

              Create  an  event  when  a  file  or directory (but see BUGS) is
              accessed (read).

              Create an event when a file is modified (write).

              Create an event when a writable file is closed.

              Create an event when a read-only file or directory is closed.

              Create an event when a file or directory is opened.

              Create an event when a permission to open a file or directory is
              requested.    An   fanotify   file   descriptor   created   with
              FAN_CLASS_PRE_CONTENT or FAN_CLASS_CONTENT is required.

              Create an event when a permission to read a file or directory is
              requested.    An   fanotify   file   descriptor   created   with
              FAN_CLASS_PRE_CONTENT or FAN_CLASS_CONTENT is required.

              Create events for  directories--for  example,  when  opendir(3),
              readdir(3)  (but see BUGS), and closedir(3) are called.  Without
              this flag, only events for files are created.

              Events for the immediate children of marked directories shall be
              created.  The flag has no effect when marking mounts.  Note that
              events are not generated for children of the  subdirectories  of
              marked  directories.   To monitor complete directory trees it is
              necessary to mark the relevant mount.

       The following composed value is defined:

              A file is closed (FAN_CLOSE_WRITE|FAN_CLOSE_NOWRITE).

       The filesystem object to be marked is determined by the file descriptor
       dirfd and the pathname specified in pathname:

       *  If  pathname  is  NULL,  dirfd  defines  the filesystem object to be

       *  If pathname is NULL, and dirfd takes the special value AT_FDCWD, the

       On success, fanotify_mark() returns 0.  On error, -1 is  returned,  and
       errno is set to indicate the error.

       EBADF  An invalid file descriptor was passed in fanotify_fd.

       EINVAL An invalid value was passed in flags or mask, or fanotify_fd was
              not an fanotify file descriptor.

       EINVAL The fanotify file descriptor was opened with FAN_CLASS_NOTIF and
              mask  contains  a  flag  for permission events (FAN_OPEN_PERM or

       ENOENT The filesystem object indicated by dirfd and pathname  does  not
              exist.  This error also occurs when trying to remove a mark from
              an object which is not marked.

       ENOMEM The necessary memory could not be allocated.

       ENOSPC The number of marks exceeds the limit of 8192 and the FAN_UNLIM-
              ITED_MARKS  flag  was  not  specified  when  the  fanotify  file
              descriptor was created with fanotify_init(2).

       ENOSYS This kernel does not implement  fanotify_mark().   The  fanotify
              API  is  available  only  if the kernel was configured with CON-

              flags contains FAN_MARK_ONLYDIR, and dirfd and pathname  do  not
              specify a directory.

       fanotify_mark()  was  introduced  in version 2.6.36 of the Linux kernel
       and enabled in version 2.6.37.

       This system call is Linux-specific.

       The following bugs were present in Linux kernels before version 3.16:

       *  If flags contains FAN_MARK_FLUSH, dirfd and pathname must specify  a
          valid filesystem object, even though this object is not used.

       *  readdir(2) does not generate a FAN_ACCESS event.

       *  If  fanotify_mark(2)  is  called  with  FAN_MARK_FLUSH, flags is not
          checked for invalid values.

       fanotify_init(2), fanotify(7)
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