mirror of https://github.com/mkerrisk/man-pages
115 lines
2.9 KiB
Groff
115 lines
2.9 KiB
Groff
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.\" Copyright (c) 2017 by Michael Kerrisk <mtk.manpages@gmail.com>
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.\"
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.\" %%%LICENSE_START(VERBATIM)
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.\" Permission is granted to make and distribute verbatim copies of this
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.\" manual provided the copyright notice and this permission notice are
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.\" preserved on all copies.
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.\"
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.\" Permission is granted to copy and distribute modified versions of this
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.\" manual under the conditions for verbatim copying, provided that the
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.\" entire resulting derived work is distributed under the terms of a
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.\" permission notice identical to this one.
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.\"
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.\" Since the Linux kernel and libraries are constantly changing, this
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.\" manual page may be incorrect or out-of-date. The author(s) assume no
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.\" responsibility for errors or omissions, or for damages resulting from
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.\" the use of the information contained herein. The author(s) may not
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.\" have taken the same level of care in the production of this manual,
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.\" which is licensed free of charge, as they might when working
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.\" professionally.
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.\"
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.\" Formatted or processed versions of this manual, if unaccompanied by
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.\" the source, must acknowledge the copyright and authors of this work.
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.\" %%%LICENSE_END
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.\"
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.TH SYSFS 5 2017-09-10 "Linux" "Linux Programmer's Manual"
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.SH NAME
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sysfs \- a filesystem for exporting kernel objects
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.SH DESCRIPTION
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The
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.B sysfs
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filesystem is a pseudo-filesystem which provides an interface to
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kernel data structures.
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(More precisely, the files and directories in
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.B sysfs
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provide a view of the
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.IR kobject
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structures defined internally within the kernel.)
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The files under
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.B sysfs
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provide information about devices, kernel modules, filesystems,
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and other kernel components.
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.PP
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The
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.B sysfs
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filesystem is commonly mounted at
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.IR /sys .
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Typically, it is mounted automatically by the system,
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but it can also be mounted manually using a command such as:
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.PP
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.in +4n
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.EX
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mount \-t sysfs sysfs /sys
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.EE
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.in
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.PP
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Many of the files in the
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.B sysfs
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filesystem are read-only,
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but some files are writable, allowing kernel variables to be changed.
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.\"
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.SS Files and directories
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The following list describes some of the files and directories under the
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.I /sys
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hierarchy.
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.TP
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.IR /sys/block
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.TP
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.IR /sys/bus
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.TP
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.IR /sys/class
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.TP
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.IR /sys/dev
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.TP
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.IR /sys/devices
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.TP
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.IR /sys/firmware
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.TP
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.IR /sys/fs
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.TP
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.IR /sys/fs/cgroup
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This directory conventionally is used as a mount point for a
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.BR tmpfs (5)
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filesystem containing mount points for
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.BR cgroups (7)
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filesystems.
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.TP
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.IR /sys/hypervisor
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.TP
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.IR /sys/kernel
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.TP
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.IR /sys/module
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.TP
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.IR /sys/power
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.SH VERSIONS
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The
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.B sysfs
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filesystem first appeared in Linux 2.6.0.
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.SH CONFORMING TO
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The
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.B sysfs
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filesystem is Linux-specific.
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.SH NOTES
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This manual page is incomplete, possibly inaccurate, and is the kind
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of thing that needs to be updated very often.
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.SH SEE ALSO
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.BR proc (5),
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.BR udev (7)
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.PP
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The kernel source file
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.I Documentation/filesystems/sysfs.txt
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and various other files in
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.IR Documentation/ABI
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and
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.IR Documentation/*/sysfs.txt
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