.\" Copyright (C) 2013, Heinrich Schuchardt .\" .\" %%%LICENSE_START(VERBATIM) .\" Permission is granted to make and distribute verbatim copies of this .\" manual provided the copyright notice and this permission notice are .\" preserved on all copies. .\" .\" Permission is granted to copy and distribute modified versions of .\" this manual under the conditions for verbatim copying, provided that .\" the entire resulting derived work is distributed under the terms of .\" a permission notice identical to this one. .\" .\" Since the Linux kernel and libraries are constantly changing, this .\" manual page may be incorrect or out-of-date. The author(s) assume. .\" no responsibility for errors or omissions, or for damages resulting. .\" from the use of the information contained herein. The author(s) may. .\" not have taken the same level of care in the production of this. .\" manual, which is licensed free of charge, as they might when working. .\" professionally. .\" .\" Formatted or processed versions of this manual, if unaccompanied by .\" the source, must acknowledge the copyright and authors of this work. .\" %%%LICENSE_END .TH FANOTIFY_MARK 2 2016-10-08 "Linux" "Linux Programmer's Manual" .SH NAME fanotify_mark \- add, remove, or modify an fanotify mark on a filesystem object .SH SYNOPSIS .nf .B #include .sp .BI "int fanotify_mark(int " fanotify_fd ", unsigned int " flags , .BI " uint64_t " mask ", int " dirfd \ ", const char *" pathname ); .fi .SH DESCRIPTION For an overview of the fanotify API, see .BR fanotify (7). .PP .BR fanotify_mark () 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. .PP The .I fanotify_fd argument is a file descriptor returned by .BR fanotify_init (2). .PP .I flags is a bit mask describing the modification to perform. It must include exactly one of the following values: .TP .B FAN_MARK_ADD The events in .I mask will be added to the mark mask (or to the ignore mask). .I mask must be nonempty or the error .B EINVAL will occur. .TP .B FAN_MARK_REMOVE The events in argument .I mask will be removed from the mark mask (or from the ignore mask). .I mask must be nonempty or the error .B EINVAL will occur. .TP .B FAN_MARK_FLUSH Remove either all mount or all non-mount marks from the fanotify group. If .I flags contains .BR FAN_MARK_MOUNT , all marks for mounts are removed from the group. Otherwise, all marks for directories and files are removed. No flag other than .B FAN_MARK_MOUNT can be used in conjunction with .BR FAN_MARK_FLUSH . .I mask is ignored. .PP If none of the values above is specified, or more than one is specified, the call fails with the error .BR EINVAL . .PP In addition, zero or more of the following values may be ORed into .IR flags : .TP .B FAN_MARK_DONT_FOLLOW If .I pathname is a symbolic link, mark the link itself, rather than the file to which it refers. (By default, .BR fanotify_mark () dereferences .I pathname if it is a symbolic link.) .TP .B FAN_MARK_ONLYDIR If the filesystem object to be marked is not a directory, the error .B ENOTDIR shall be raised. .TP .B FAN_MARK_MOUNT Mark the mount point specified by .IR pathname . If .I pathname is not itself a mount point, the mount point containing .I pathname will be marked. All directories, subdirectories, and the contained files of the mount point will be monitored. .TP .B FAN_MARK_IGNORED_MASK The events in .I mask shall be added to or removed from the ignore mask. .TP .B FAN_MARK_IGNORED_SURV_MODIFY The ignore mask shall survive modify events. If this flag is not set, the ignore mask is cleared when a modify event occurs for the ignored file or directory. .PP .I mask defines which events shall be listened for (or which shall be ignored). It is a bit mask composed of the following values: .TP .B FAN_ACCESS Create an event when a file or directory (but see BUGS) is accessed (read). .TP .B FAN_MODIFY Create an event when a file is modified (write). .TP .B FAN_CLOSE_WRITE Create an event when a writable file is closed. .TP .B FAN_CLOSE_NOWRITE Create an event when a read-only file or directory is closed. .TP .B FAN_OPEN Create an event when a file or directory is opened. .TP .B FAN_Q_OVERFLOW Create an event when an overflow of the event queue occurs. The size of the event queue is limited to 16384 entries if .B FAN_UNLIMITED_QUEUE is not set in .BR fanotify_init (2). .TP .B FAN_OPEN_PERM Create an event when a permission to open a file or directory is requested. An fanotify file descriptor created with .B FAN_CLASS_PRE_CONTENT or .B FAN_CLASS_CONTENT is required. .TP .B FAN_ACCESS_PERM Create an event when a permission to read a file or directory is requested. An fanotify file descriptor created with .B FAN_CLASS_PRE_CONTENT or .B FAN_CLASS_CONTENT is required. .TP .B FAN_ONDIR Create events for directories\(emfor example, when .BR opendir (3), .BR readdir (3) (but see BUGS), and .BR closedir (3) are called. Without this flag, only events for files are created. .TP .B FAN_EVENT_ON_CHILD 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. .PP The following composed value is defined: .TP .B FAN_CLOSE A file is closed .RB ( FAN_CLOSE_WRITE | FAN_CLOSE_NOWRITE ). .PP The filesystem object to be marked is determined by the file descriptor .I dirfd and the pathname specified in .IR pathname : .IP * 3 If .I pathname is NULL, .I dirfd defines the filesystem object to be marked. .IP * If .I pathname is NULL, and .I dirfd takes the special value .BR AT_FDCWD , the current working directory is to be marked. .IP * If .I pathname is absolute, it defines the filesystem object to be marked, and .I dirfd is ignored. .IP * If .I pathname is relative, and .I dirfd does not have the value .BR AT_FDCWD , then the filesystem object to be marked is determined by interpreting .I pathname relative the directory referred to by .IR dirfd . .IP * If .I pathname is relative, and .I dirfd has the value .BR AT_FDCWD , then the filesystem object to be marked is determined by interpreting .I pathname relative the current working directory. .SH RETURN VALUE On success, .BR fanotify_mark () returns 0. On error, \-1 is returned, and .I errno is set to indicate the error. .SH ERRORS .TP .B EBADF An invalid file descriptor was passed in .IR fanotify_fd . .TP .B EINVAL An invalid value was passed in .IR flags or .IR mask , or .I fanotify_fd was not an fanotify file descriptor. .TP .B EINVAL The fanotify file descriptor was opened with .B FAN_CLASS_NOTIF and mask contains a flag for permission events .RB ( FAN_OPEN_PERM or .BR FAN_ACCESS_PERM ). .TP .B ENOENT The filesystem object indicated by .IR dirfd and .IR pathname does not exist. This error also occurs when trying to remove a mark from an object which is not marked. .TP .B ENOMEM The necessary memory could not be allocated. .TP .B ENOSPC The number of marks exceeds the limit of 8192 and the .B FAN_UNLIMITED_MARKS flag was not specified when the fanotify file descriptor was created with .BR fanotify_init (2). .TP .B ENOSYS This kernel does not implement .BR fanotify_mark (). The fanotify API is available only if the kernel was configured with .BR CONFIG_FANOTIFY . .TP .B ENOTDIR .I flags contains .BR FAN_MARK_ONLYDIR , and .I dirfd and .I pathname do not specify a directory. .SH VERSIONS .BR fanotify_mark () was introduced in version 2.6.36 of the Linux kernel and enabled in version 2.6.37. .SH CONFORMING TO This system call is Linux-specific. .SH BUGS The following bugs were present in Linux kernels before version 3.16: .IP * 3 .\" Fixed by commit 0a8dd2db579f7a0ac7033d6b857c3d5dbaa77563 If .I flags contains .BR FAN_MARK_FLUSH , .I dirfd and .I pathname must specify a valid filesystem object, even though this object is not used. .IP * .\" Fixed by commit d4c7cf6cffb1bc711a833b5e304ba5bcfe76398b .BR readdir (2) does not generate a .B FAN_ACCESS event. .IP * .\" Fixed by commit cc299a98eb13a9853675a9cbb90b30b4011e1406 If .BR fanotify_mark () is called with .BR FAN_MARK_FLUSH , .I flags is not checked for invalid values. .SH SEE ALSO .BR fanotify_init (2), .BR fanotify (7) .SH COLOPHON This page is part of release 4.10 of the Linux .I man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at \%https://www.kernel.org/doc/man\-pages/.