958aa57537
kernel-based POSIX semaphore descriptors to userland via procstat(1) and fstat(1): - Change sem file descriptors to track the pathname they are associated with and add a ksem_info() method to copy the path out to a caller-supplied buffer. - Use the fo_stat() method of shared memory objects and ksem_info() to export the path, mode, and value of a semaphore via struct kinfo_file. - Add a struct semstat to the libprocstat(3) interface along with a procstat_get_sem_info() to export the mode and value of a semaphore. - Teach fstat about semaphores and to display their path, mode, and value. MFC after: 2 weeks
236 lines
7.5 KiB
Groff
236 lines
7.5 KiB
Groff
.\" Copyright (c) 1987, 1991, 1993
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.\" The Regents of the University of California. 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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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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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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.\" @(#)fstat.1 8.3 (Berkeley) 2/25/94
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.\" $FreeBSD$
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.\"
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.Dd September 28, 2011
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.Dt FSTAT 1
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.Os
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.Sh NAME
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.Nm fstat
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.Nd identify active files
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.Sh SYNOPSIS
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.Nm
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.Op Fl fmnv
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.Op Fl M Ar core
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.Op Fl N Ar system
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.Op Fl p Ar pid
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.Op Fl u Ar user
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.Op Ar
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.Sh DESCRIPTION
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The
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.Nm
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utility identifies open files.
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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, or kernel trace file for that process.
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If no options are specified,
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.Nm
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reports on all open files in the system.
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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 f
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Restrict examination to files open in the same file systems as
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the named file arguments, or to the file system containing the
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current directory if there are no additional filename arguments.
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For example, to find all files open in the file system where the
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directory
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.Pa /usr/src
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resides, type
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.Dq Li fstat -f /usr/src .
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.It Fl M
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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 N
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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 m
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Include memory-mapped files in the listing; normally these are excluded
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due to the extra processing required.
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.It Fl n
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Numerical format.
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Print the device number (maj,min) of the file system
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the file resides in rather than the mount point name; for special
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files, print the
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device number that the special device refers to rather than the filename
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in
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.Pa /dev ;
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and print the mode of the file in octal instead of symbolic form.
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.It Fl p
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Report all files open by the specified process.
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.It Fl u
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Report all files open by the specified user.
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.It Fl v
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Verbose mode.
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Print error messages upon failures to locate particular
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system data structures rather than silently ignoring them.
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Most of
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these data structures are dynamically created or deleted and it is
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possible for them to disappear while
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.Nm
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is running.
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This
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is normal and unavoidable since the rest of the system is running while
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.Nm
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itself is running.
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.It Ar
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Restrict reports to the specified files.
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.El
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.Pp
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The following fields are printed:
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.Bl -tag -width MOUNT
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.It Li USER
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The username of the owner of the process (effective uid).
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.It Li CMD
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The command name of the process.
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.It Li PID
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The process id.
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.It Li FD
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The file number in the per-process open file table or one of the following
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special names:
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.Pp
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.Bd -literal -offset indent -compact
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jail - jail root directory
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mmap - memory-mapped file
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root - root inode
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text - executable text inode
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tr - kernel trace file
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wd - current working directory
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.Ed
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.Pp
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If the file number is followed by an asterisk (``*''), the file is
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not an inode, but rather a socket,
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.Tn FIFO ,
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or there is an error.
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In this case the remainder of the line does not
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correspond to the remaining headers -- the format of the line
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is described later under
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.Sx SOCKETS .
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.It Li MOUNT
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If the
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.Fl n
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flag was not specified, this header is present and is the
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pathname that the file system the file resides in is mounted on.
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.It Li DEV
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If the
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.Fl n
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flag is specified, this header is present and is the
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number of the device that this file resides in.
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.It Li INUM
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The inode number of the file.
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.It Li MODE
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The mode of the file.
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If the
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.Fl n
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flag is not specified, the mode is printed
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using a symbolic format (see
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.Xr strmode 3 ) ;
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otherwise, the mode is printed
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as an octal number.
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.It Li SZ\&|DV
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If the file is a semaphore,
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prints the current value of the semaphore.
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If the file is not a character or block special, prints the size of
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the file in bytes.
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Otherwise, if the
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.Fl n
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flag is not specified, prints
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the name of the special file as located in
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.Pa /dev .
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If that cannot be
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located, or the
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.Fl n
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flag is specified, prints the major/minor device
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number that the special device refers to.
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.It Li R/W
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This column describes the access mode that the file allows.
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The letter ``r'' indicates open for reading;
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the letter ``w'' indicates open for writing.
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This field is useful when trying to find the processes that are
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preventing a file system from being down graded to read-only.
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.It Li NAME
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If filename arguments are specified and the
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.Fl f
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flag is not, then
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this field is present and is the name associated with the given file.
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Normally the name cannot be determined since there is no mapping
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from an open file back to the directory entry that was used to open
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that file.
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Also, since different directory entries may reference
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the same file (via
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.Xr ln 1 ) ,
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the name printed may not be the actual
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name that the process originally used to open that file.
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.El
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.Sh SOCKETS
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The formatting of open sockets depends on the protocol domain.
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In all cases the first field is the domain name, the second field
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is the socket type (stream, dgram, etc), and the third is the socket
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flags field (in hex).
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The remaining fields are protocol dependent.
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For tcp, it is the address of the tcpcb, and for udp, the inpcb (socket pcb).
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For unix domain sockets, its the address of the socket pcb and the address
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of the connected pcb (if connected).
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Otherwise the protocol number and address of the socket itself are printed.
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The attempt is to make enough information available to
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permit further analysis without duplicating
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.Xr netstat 1 .
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.Pp
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For example, the addresses mentioned above are the addresses which the
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.Dq Li netstat -A
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command would print for tcp, udp, and unixdomain.
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Note that since pipes are implemented using sockets, a pipe appears as a
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connected unix domain stream socket.
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A unidirectional unix domain socket indicates the direction of flow with
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an arrow (``<-'' or ``->''), and a full duplex socket shows a double arrow
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(``<->'').
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.Sh SEE ALSO
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.Xr netstat 1 ,
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.Xr nfsstat 1 ,
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.Xr procstat 1 ,
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.Xr ps 1 ,
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.Xr sockstat 1 ,
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.Xr systat 1 ,
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.Xr tcp 4 ,
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.Xr unix 4 ,
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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 HISTORY
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The
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.Nm
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command appeared in
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.Bx 4.3 tahoe .
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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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