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The proc filesystem (procfs) is a special filesystem in Unix-like operating systems that presents information about processes and other system information in a hierarchical file-like structure, providing a more convenient and standardized method for dynamically accessing process data held in the kernel than traditional tracing methods or direct access to kernel memory. Typically, it is mapped to a mount point named /proc at boot time. The proc file system acts as an interface to internal data structures about running processes in the kernel. In Linux, it can also be used to obtain information about the kernel and to change certain kernel parameters at runtime (sysctl).
Many Unix-like operating systems support the proc filesystem, including System V, Solaris, IRIX, Tru64 UNIX, BSD, Linux, IBM AIX,[1] QNX, and Plan 9 from Bell Labs. OpenBSD dropped support in version 5.7, released in May 2015. It is absent from HP-UX[1] and macOS.[2]
The Linux kernel extends it to non–process-related data.
The proc filesystem provides a method of communication between kernel space and user space. For example, the GNU version of the process reporting utility ps uses the proc file system to obtain its data, without using any specialized system calls.
^ abNemeth, Evi; Snyder, Garth; Hein, Trent R.; Whaley, Ben (14 July 2010). UNIX and Linux System Administration Handbook. Pearson Education. p. 136. ISBN 978-0-13-211736-4.
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manual page - Description of the original procfs. Plan 9 procfs manual page - Plan 9 greatly expanded the procfs concept, providing a much expanded interface...
previously obtained via procfs, and some scripts configure device drivers and devices via their attributes. Linux portal procfs configfs tmpfs sysctl,...
call for each word). For this reason the 8th edition of Unix introduced procfs, which allows permitted processes direct access to the memory of another...
List of TCP and UDP port numbers The effective range is accessible via procfs at node /proc/sys/net/ipv4/ip_local_port_range. Karen R.Sollins (July 1992)...
to files that are either computed on request, called virtual files (see procfs and sysfs), or are mapping into another, backing storage. From c. 1900 and...
directory as a virtual filesystem (sysfs, comparable to /proc, which is a procfs), which stores and allows modification of the devices connected to the system...
system in Unix-like operating systems for managing device nodes on-the-fly procfs – a pseudo-file system, used to access kernel information about processes...
refer to: Proč, a village in eastern Slovakia Proč?, a 1987 Czech film procfs or proc filesystem, a special file system (typically mounted to /proc) in...
language abstracts platform-specific query mechanisms like proc filesystems (procfs) and SIM, and it is capable of responding faster than native alternatives...
of directories. Inotify does report some but not all events in sysfs and procfs. Notification via inotify requires the kernel to be aware of all relevant...
This is either done directly by sending special sequences to the register procfs file or using a wrapper like Debian-based distributions binfmt-support package...
implemented with system calls such as ptrace or system calls on files in procfs. Implementing system calls requires a transfer of control from user space...
6 of the Linux kernel mainline), a different name can be specified via procfs using the /proc/sys/kernel/core_pattern configuration file; the specified...
support Old version, no longer maintained: 0.97 1 August 1992 0.97.6 Initial procfs PS/2 mouse support Microsoft bus mouse support SCSI CD-ROM support Old version...
defined in unusual_uas.h. Temporary additional quirks can be added via procfs or kernel command line (usb-storage.quirks). FreeBSD does not support UAS...
priority and voluntary context switches via getrusage. Supports sampling procfs on supporting systems to report metrics such as page-based resident set...
Source Fish. rcctl(8) utility to control daemons nginx(8) removed from base procfs has been removed Old version, no longer maintained: 5.8 18 October 2015...
used to explicitly invoke them. Pseudo filesystems (e.g., the sysfs and procfs filesystems) and special files (e.g., /dev/random, /dev/sda, /dev/tty, and...
Includes Kerberos 5, PAM, TrueType fonts, WebNFS, large file support, enhanced procfs. SPARCserver 600MP series support dropped. Last update was Solaris 2.6 5/98...
2010-04-30, retrieved 2011-12-08 "A month of the Hurd: Media Appearances, procfs, Arch Hurd.", GNU, 2010-08-31, retrieved 2011-12-08 "Graphical livecd -...
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