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author | Cyrill Gorcunov <gorcunov@openvz.org> | 2012-12-17 16:05:14 -0800 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-12-17 17:15:28 -0800 |
commit | f1d8c16298d317dbdeb166a135e85dadd1782858 (patch) | |
tree | b7b5fd4fc10dfa153e796a7bd69d4edcd8a695b1 /Documentation | |
parent | be77196b809cdce8603a5aadd5e3cfabd3cbef96 (diff) | |
download | linux-3.10-f1d8c16298d317dbdeb166a135e85dadd1782858.tar.gz linux-3.10-f1d8c16298d317dbdeb166a135e85dadd1782858.tar.bz2 linux-3.10-f1d8c16298d317dbdeb166a135e85dadd1782858.zip |
docs: add documentation about /proc/<pid>/fdinfo/<fd> output
[akpm@linux-foundation.org: tweak documentation]
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Pavel Emelyanov <xemul@parallels.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Andrey Vagin <avagin@openvz.org>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: James Bottomley <jbottomley@parallels.com>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Matthew Helsley <matt.helsley@gmail.com>
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@onelan.co.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation')
-rw-r--r-- | Documentation/filesystems/proc.txt | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/Documentation/filesystems/proc.txt b/Documentation/filesystems/proc.txt index 12665ee7094..bcc27c97efb 100644 --- a/Documentation/filesystems/proc.txt +++ b/Documentation/filesystems/proc.txt @@ -41,6 +41,7 @@ Table of Contents 3.5 /proc/<pid>/mountinfo - Information about mounts 3.6 /proc/<pid>/comm & /proc/<pid>/task/<tid>/comm 3.7 /proc/<pid>/task/<tid>/children - Information about task children + 3.8 /proc/<pid>/fdinfo/<fd> - Information about opened file 4 Configuring procfs 4.1 Mount options @@ -1633,6 +1634,87 @@ pids, so one need to either stop or freeze processes being inspected if precise results are needed. +3.7 /proc/<pid>/fdinfo/<fd> - Information about opened file +--------------------------------------------------------------- +This file provides information associated with an opened file. The regular +files have at least two fields -- 'pos' and 'flags'. The 'pos' represents +the current offset of the opened file in decimal form [see lseek(2) for +details] and 'flags' denotes the octal O_xxx mask the file has been +created with [see open(2) for details]. + +A typical output is + + pos: 0 + flags: 0100002 + +The files such as eventfd, fsnotify, signalfd, epoll among the regular pos/flags +pair provide additional information particular to the objects they represent. + + Eventfd files + ~~~~~~~~~~~~~ + pos: 0 + flags: 04002 + eventfd-count: 5a + + where 'eventfd-count' is hex value of a counter. + + Signalfd files + ~~~~~~~~~~~~~~ + pos: 0 + flags: 04002 + sigmask: 0000000000000200 + + where 'sigmask' is hex value of the signal mask associated + with a file. + + Epoll files + ~~~~~~~~~~~ + pos: 0 + flags: 02 + tfd: 5 events: 1d data: ffffffffffffffff + + where 'tfd' is a target file descriptor number in decimal form, + 'events' is events mask being watched and the 'data' is data + associated with a target [see epoll(7) for more details]. + + Fsnotify files + ~~~~~~~~~~~~~~ + For inotify files the format is the following + + pos: 0 + flags: 02000000 + inotify wd:3 ino:9e7e sdev:800013 mask:800afce ignored_mask:0 fhandle-bytes:8 fhandle-type:1 f_handle:7e9e0000640d1b6d + + where 'wd' is a watch descriptor in decimal form, ie a target file + descriptor number, 'ino' and 'sdev' are inode and device where the + target file resides and the 'mask' is the mask of events, all in hex + form [see inotify(7) for more details]. + + If the kernel was built with exportfs support, the path to the target + file is encoded as a file handle. The file handle is provided by three + fields 'fhandle-bytes', 'fhandle-type' and 'f_handle', all in hex + format. + + If the kernel is built without exportfs support the file handle won't be + printed out. + + For fanotify files the format is + + pos: 0 + flags: 02 + fanotify ino:2 sdev:800013 mask:1 ignored_mask:40000000 fhandle-bytes:8 fhandle-type:1 f_handle:0200000000000000 + + or + + pos: 0 + flags: 02 + fanotify mnt_id:13 mask:1 ignored_mask:40000000 + + where 'ino', 'sdev' are target inode and device, 'mnt_id' is the mount + point identifier, 'mask' is the events mask used and 'ignored_mask' is + the mask of events which are to be ignored. All in hex format. + + ------------------------------------------------------------------------------ Configuring procfs ------------------------------------------------------------------------------ |