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152 lines
4.4 KiB
Groff
152 lines
4.4 KiB
Groff
.\" Copyright (c) 2005-2011 Stanislav Sedov <stas@FreeBSD.org>
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.Dd June 18, 2020
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.Dt FUSER 1
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.Os
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.Sh NAME
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.Nm fuser
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.Nd list IDs of all processes that have one or more files open
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.Sh SYNOPSIS
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.Nm
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.Op Fl cfkmu
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.Op Fl M Ar core
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.Op Fl N Ar system
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.Op Fl s Ar signal
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.Ar
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.Sh DESCRIPTION
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The
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.Nm
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utility writes to stdout the PIDs of processes that have one or
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more named files open.
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For block and character special devices, all processes using files
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on that device are listed.
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A file is considered open by a process if it was explicitly opened,
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is the working directory, root directory, jail root directory,
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active executable text, kernel trace file or the controlling terminal
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of the process.
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If
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.Fl m
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option is specified, the
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.Nm
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utility will also look through mmapped files.
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.Pp
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The following options are available:
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.Bl -tag -width indent
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.It Fl c
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Treat files as mount points and report on any files open in the file system.
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.It Fl f
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The report must be only for named files.
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.It Fl k
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Send signal to reported processes
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.Pq Dv SIGKILL No by default .
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.It Fl M Ar core
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Extract values associated with the name list from the specified core
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instead of the default
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.Pa /dev/kmem .
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.It Fl m
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Search through mmapped files too.
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.It Fl N Ar system
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Extract the name list from the specified system instead of the default,
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which is the kernel image the system has booted from.
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.It Fl s Ar signal
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Use given signal name instead of default
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.Dv SIGKILL .
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.It Fl u
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Write the user name associated with each process to stderr.
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.El
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.Pp
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The following symbols, written to stderr will indicate how files are used:
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.Pp
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.Bl -tag -width indent -compact
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.It Sy a
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The file is open as append only
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.Pq Dv O_APPEND No was specified .
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.It Sy c
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The file is the current workdir directory of the process.
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.It Sy d
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The process bypasses fs cache while writing to this file
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.Pq Dv O_DIRECT No was specified .
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.It Sy e
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Exclusive lock is hold.
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.It Sy j
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The file is the jail root of the process.
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.It Sy m
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The file is mmapped.
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.It Sy r
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The file is the root directory of the process.
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.It Sy s
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Shared lock is hold.
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.It Sy t
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The file is the kernel tracing file for the process.
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.It Sy w
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The file is open for writing.
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.It Sy x
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The file is executable text of the process.
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.It Sy y
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The process uses this file as its controlling tty.
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.El
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.Sh EXIT STATUS
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.Ex -std
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.Sh EXAMPLES
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The command
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.Ql "fuser -fu \&."
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writes to standard output the process IDs of processes that are using the
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current directory and writes to stderr an indication of how those processes are
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using the directory and user names associated with the processes that are using
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this directory.
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.Sh SEE ALSO
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.Xr fstat 1 ,
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.Xr ps 1 ,
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.Xr systat 1 ,
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.Xr iostat 8 ,
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.Xr pstat 8 ,
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.Xr vmstat 8
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.Sh STANDARDS
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The
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.Nm
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utility is expected to conform to
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.St -p1003.1-2004 .
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.Sh HISTORY
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The
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.Nm
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utility appeared in
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.Fx 9.0 .
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.Sh AUTHORS
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The
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.Nm
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utility and this manual page was written by
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.An Stanislav Sedov Aq Mt stas@FreeBSD.org .
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.Sh BUGS
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Since
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.Nm
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takes a snapshot of the system, it is only correct for a very short period
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of time.
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When working via
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.Xr kvm 3
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interface the report will be limited to filesystems the
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.Nm
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utility knows about (currently only cd9660, devfs, nfs, ntfs, nwfs, udf,
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ufs and zfs).
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