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.br open_by_handle_at (2) |
to get an open directory file descriptor and that file descriptor along with |
the reported name can be used to call |
.br fstatat (2). |
the same rule that applies to record type |
.br fan_event_info_type_dfid |
also applies to record type |
.br fan_event_info_type_dfid_name : |
if a non-directory object has no parent, either the event will not be reported |
or it will be reported without the directory entry information. |
note that there is no guarantee that the filesystem object will be found at the |
location described by the directory entry information at the time the event is |
received. |
see |
.br fanotify (7) |
for additional details. |
.tp |
.b fan_report_dfid_name |
this is a synonym for |
.rb ( fan_report_dir_fid | fan_report_name ). |
.pp |
the |
.i event_f_flags |
argument |
defines the file status flags that will be set on the open file descriptions |
that are created for fanotify events. |
for details of these flags, see the description of the |
.i flags |
values in |
.br open (2). |
.i event_f_flags |
includes a multi-bit field for the access mode. |
this field can take the following values: |
.tp |
.b o_rdonly |
this value allows only read access. |
.tp |
.b o_wronly |
this value allows only write access. |
.tp |
.b o_rdwr |
this value allows read and write access. |
.pp |
additional bits can be set in |
.ir event_f_flags . |
the most useful values are: |
.tp |
.b o_largefile |
enable support for files exceeding 2\ gb. |
failing to set this flag will result in an |
.b eoverflow |
error when trying to open a large file which is monitored by |
an fanotify group on a 32-bit system. |
.tp |
.br o_cloexec " (since linux 3.18)" |
.\" commit 0b37e097a648aa71d4db1ad108001e95b69a2da4 |
enable the close-on-exec flag for the file descriptor. |
see the description of the |
.b o_cloexec |
flag in |
.br open (2) |
for reasons why this may be useful. |
.pp |
the following are also allowable: |
.br o_append , |
.br o_dsync , |
.br o_noatime , |
.br o_nonblock , |
and |
.br o_sync . |
specifying any other flag in |
.i event_f_flags |
yields the error |
.b einval |
(but see bugs). |
.sh return value |
on success, |
.br fanotify_init () |
returns a new file descriptor. |
on error, \-1 is returned, and |
.i errno |
is set to indicate the error. |
.sh errors |
.tp |
.b einval |
an invalid value was passed in |
.i flags |
or |
.ir event_f_flags . |
.b fan_all_init_flags |
(deprecated since linux kernel version 4.20) |
.\" commit 23c9deeb3285d34fd243abb3d6b9f07db60c3cf4 |
defines all allowable bits for |
.ir flags . |
.tp |
.b emfile |
the number of fanotify groups for this user exceeds 128. |
.tp |
.b emfile |
the per-process limit on the number of open file descriptors has been reached. |
Subsets and Splits