| 词条 | Sysfs |
| 释义 |
sysfs is a pseudo file system provided by the Linux kernel that exports information about various kernel subsystems, hardware devices, and associated device drivers from the kernel's device model to user space through virtual files.[1] In addition to providing information about various devices and kernel subsystems, exported virtual files are also used for their configuration. sysfs provides functionality similar to the sysctl mechanism found in BSD operating systems, with the difference that sysfs is implemented as a virtual file system instead of being a purpose-built kernel mechanism, and that, in Linux, sysctl configuration parameters are made available at /proc/sys/ as part of procfs, not sysfs which is mounted at /sys/.[2] HistoryDuring the 2.5 development cycle, the Linux driver model was introduced to fix several shortcomings of version 2.4:
Sysfs was designed to export the information present in the device tree which would then no longer clutter up procfs. It was written by Patrick Mochel.[3][4] Maneesh Soni later wrote the sysfs backing store patch to reduce memory usage on large systems. During the next year of 2.5 development the infrastructural capabilities of the driver model and driverfs, formerly called ddfs, began to prove useful to other subsystems.[5][6] kobjects were developed to provide a central object management mechanism and driverfs was renamed to sysfs to represent its subsystem agnosticism. Sysfs is mounted under the /sys mount point. If it is not mounted during initialization, you can always mount it using the command: "mount -t sysfs sysfs /sys" Supported buses
Exports information about PCI devices.
Contains both USB devices and USB hosts.
As the S/390 architecture contains devices not found elsewhere, special buses have been created:
Sysfs and userspaceSysfs is used by several utilities to access information about hardware and its driver (kernel modules) such as udev or HAL. Scripts have been written to access information previously obtained via procfs, and some scripts configure device drivers and devices via their attributes. See also{{Portal|Linux}}
References1. ^{{cite web|url=https://www.kernel.org/doc/Documentation/filesystems/sysfs.txt|title=sysfs - _The_ filesystem for exporting kernel objects|author=Patrick Mochel and Mike Murphy|publisher=kernel.org}} 2. ^{{cite web|quote=sysctl is used to modify kernel parameters at runtime. The parameters available are those listed under /proc/sys/. Procfs is required for sysctl support in Linux. You can use sysctl to both read and write sysctl data.|url=https://www.freebsd.org/cgi/man.cgi?query=sysctl&sektion=8&manpath=SuSE+Linux%2fi386+11.3|publisher=FreeBSD|author=SUSE|title=sysctl man page}} 3. ^{{cite web |first=Linus |last=Torvalds |title=Linux v2.5.44 - and offline for a week |date=18 October 2002 |url=https://lkml.org/lkml/2002/10/19/8}} 4. ^{{cite web |first=Linus |last=Torvalds |title=Linux v2.5.46 |date=4 November 2002 |url=https://lkml.org/lkml/2002/11/4/213}} 5. ^{{cite web |first=Patrick |last=Mochel |title=[RFC] New Driver Model for 2.5 |date=17 October 2001 |url=https://lkml.org/lkml/2001/10/17/147}} 6. ^{{cite web |first=Tim |last=Jansen |title=Re: [PATCH] 2.5 PROPOSAL: Replacement for current /proc of shit. |date=1 November 2001 |url=https://lkml.org/lkml/2001/11/1/38}} External links
4 : Free special-purpose file systems|Interfaces of the Linux kernel|Linux kernel features|Pseudo file systems supported by the Linux kernel |
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