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.\" %%%license_end |
.\" |
.\" modified sun jul 25 11:06:34 1993 by rik faith ([email protected]) |
.\" corrected mon oct 21 17:47:19 edt 1996 by eric s. raymond ([email protected]) |
.th nologin 5 2017-09-15 "linux" "linux programmer's manual" |
.sh name |
nologin \- prevent unprivileged users from logging into the system |
.sh description |
if the file \fi/etc/nologin\fp exists and is readable, |
.br login (1) |
will allow access only to root. |
other users will |
be shown the contents of this file and their logins will be refused. |
this provides a simple way of temporarily disabling all unprivileged logins. |
.sh files |
.i /etc/nologin |
.sh see also |
.br login (1), |
.br shutdown (8) |
.sh colophon |
this page is part of release 5.13 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/. |
.so man3/erfc.3 |
\" copyright (c) 2013, heinrich schuchardt <[email protected]> |
.\" |
.\" %%%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.\" manual page may be incorrect or out-of-date.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_init 2 2021-03-22 "linux" "linux programmer's manual" |
.sh name |
fanotify_init \- create and initialize fanotify group |
.sh synopsis |
.nf |
.br "#include <fcntl.h>" " /* definition of " o_* " constants */" |
.b #include <sys/fanotify.h> |
.pp |
.bi "int fanotify_init(unsigned int " flags ", unsigned int " event_f_flags ); |
.fi |
.sh description |
for an overview of the fanotify api, see |
.br fanotify (7). |
.pp |
.br fanotify_init () |
initializes a new fanotify group and returns a file descriptor for the event |
queue associated with the group. |
.pp |
the file descriptor is used in calls to |
.br fanotify_mark (2) |
to specify the files, directories, mounts, or filesystems for which fanotify |
events shall be created. |
these events are received by reading from the file descriptor. |
some events are only informative, indicating that a file has been accessed. |
other events can be used to determine whether |
another application is permitted to access a file or directory. |
permission to access filesystem objects is granted by writing to the file |
descriptor. |
.pp |
multiple programs may be using the fanotify interface at the same time to |
monitor the same files. |
.pp |
in the current implementation, the number of fanotify groups per user is |
limited to 128. |
this limit cannot be overridden. |
.pp |
calling |
.br fanotify_init () |
requires the |
.b cap_sys_admin |
capability. |
this constraint might be relaxed in future versions of the api. |
therefore, certain additional capability checks have been implemented as |
indicated below. |
.pp |
the |
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