proc_pid_fdinfo(5) File Formats Manual proc_pid_fdinfo(5) (NAME) /proc/pid/fdinfo/ - (DESCRIPTION) (file descriptor) . . . . : $ cat /proc/12015/fdinfo/4 pos: 1000 flags: 01002002 mnt_id: 21 ino: 63107 : pos ( ) . flags () ( open(2) ). close-on-exec flags O_CLOEXEC . 3.1 O_CLOEXEC close-on-exec . mnt_id 3.15 (mount) . /proc/pid/mountinfo . ino 5.14 (inode) . eventfd ( eventfd(2) ) ( 3.8) : pos: 0 flags: 02 mnt_id: 10 ino: 63107 eventfd-count: 40 eventfd-count eventfd () . epoll ( epoll(7) ) ( 3.8) : pos: 0 flags: 02 mnt_id: 10 ino: 63107 tfd: 9 events: 19 data: 74253d2500000009 tfd: 7 events: 19 data: 74253d2500000007 tfd epoll ( epoll_ctl(2) ). tfd . events . data . signalfd ( signalfd(2) ) ( 3.8) : pos: 0 flags: 02 mnt_id: 10 ino: 63107 sigmask: 0000000000000006 sigmask signalfd . ( SIGINT SIGQUIT signal(7) .) inotify ( inotify(7) ) ( 3.8) : pos: 0 flags: 00 mnt_id: 11 ino: 63107 inotify wd:2 ino:7ef82a sdev:800001 mask:800afff ignored_mask:0 fhandle-bytes:8 fhandle-type:1 f_handle:2af87e00220ffd73 inotify wd:1 ino:192627 sdev:800001 mask:800afff ignored_mask:0 fhandle-bytes:8 fhandle-type:1 f_handle:27261900802dfd73 "inotify" . : wd ( ). ino ( ). sdev ( ). mask ( ). exportfs (file handle) : fhandle-bytes fhandle-type f_handle. fanotify ( fanotify(7) ) ( 3.8) : pos: 0 flags: 02 mnt_id: 11 ino: 63107 fanotify flags:0 event-flags:88002 fanotify ino:19264f sdev:800001 mflags:0 mask:1 ignored_mask:0 fhandle-bytes:8 fhandle-type:1 f_handle:4f261900a82dfd73 fanotify fanotify_init(2) : flags flags fanotify_init(2) ( ). event-flags event_f_flags fanotify_init(2) ( ). (marks) fanotify . inotify : mflags ( ). mask ( ). ignored_mask ( ). fanotify_mark(2) . timerfd ( timerfd(2) ) ( 3.17) : pos: 0 flags: 02004002 mnt_id: 13 ino: 63107 clockid: 0 ticks: 0 settime flags: 03 it_value: (7695568592, 640020877) it_interval: (0, 0) clockid ( CLOCK_* ) ( 0 CLOCK_REALTIME ). ticks ( read(2) ). settime flags timerfd ( timerfd_settime(2) ) () ( TFD_TIMER_ABSTIME TFD_TIMER_CANCEL_ON_SET ). it_value . TFD_TIMER_ABSTIME . it_interval . ( it_value it_interval timerfd_gettime(2) .) (HISTORY) 2.6.22. (SEE ALSO) proc(5) Linux man-pages 6.19 2026-07-18 proc_pid_fdinfo(5)