LINPROCFS(4) Kernel Interfaces Manual LINPROCFS(4) NAME linprocfs -- Linux process file system SYNOPSIS linprocfs /compat/linux/proc linprocfs rw 0 0 DESCRIPTION The Linux process file system, or linprocfs, emulates a subset of Linux' process file system and is required for the complete operation of some Linux binaries. The linprocfs provides a two-level view of process space. At the highest level, processes themselves are named, according to their process ids in decimal, with no leading zeros. There is also a special node called self which always refers to the process making the lookup request. Each process node is a directory containing several files: auxv The auxiliary vector passed to the program. cmdline The command line used to execute the process. cwd A symbolic link pointing to the current work directory of the process. environ The list of environment variables and values of the process. Every variable and pair value is separated from the next by a NULL byte. exe A reference to the vnode from which the process text was read. This can be used to gain access to the process' sym- bol table, or to start another copy of the process. limits The soft and hard limits for the process along with the units used. maps Memory map of the process. mem The complete virtual memory image of the process. Only those addresses which exist in the process can be accessed. Reads and writes to this file modify the process. Writes to the text segment remain private to the process. mountinfo Information about mount points. mounts Similar to the above. oom_score_adj Score adjustment for the Out Of Memory killer. root Symbolic link to the root directory for this process. stat Process statistics. It includes user, nice, system, idle, iowait, irq, softirq, steal, guest and guest_nice. statm Process size statistics. It includes total program size, resident set size, number of resident shared pages (unused), text size, library size (unused), data + stack and dirty pages (unused). status Process statistics in human readable form. It includes process name, state, PID, etc. task Dummy directory to avoid problems in specific software such as Chromium. Each node is owned by the process's user, and belongs to that user's pri- mary group, except for the mem node, which belongs to the kmem group. FILES /compat/linux/proc The normal mount point for linprocfs. /compat/linux/proc/cmdline Contains the path of the kernel image used to boot the system. /compat/linux/proc/cpuinfo CPU vendor and model information in human- readable form. /compat/linux/proc/devices List of character and block devices. The later is usually empty on FreeBSD. /compat/linux/proc/filesystems List of supported filesystems. For pseudo filesystems, the first column contains nodev. /compat/linux/proc/meminfo System memory information in human-readable form. /compat/linux/proc/modules Loaded kernel modules. Empty for now. /compat/linux/proc/mounts Devices corresponding mount points. /compat/linux/proc/mtab Same as above. /compat/linux/proc/partitions Partition information including major and minor numbers, number of blocks and name. The rest of the fields are set to zero. /compat/linux/proc/stat System statistics. For each cpu it in- cludes at most user time, nice time, system time and idle time, iowait (time waiting for I/O to complete), times serving irqs and softirq, steal, guest and guest_nice times that represent times spent in differ- ent modes in a virtualized environment. The last columns are set to zero. This file also contains brief statistics for disks, context switches and more. /compat/linux/proc/swap Information about the swap device if any. /compat/linux/proc/uptime Time since the last boot and time spent in idle state. /compat/linux/proc/version Version of the emulated linux system. /compat/linux/proc/<pid> A directory containing process information for process pid. /compat/linux/proc/self A symlink to a directory containing process information for the current process. EXAMPLES To mount a linprocfs file system on /compat/linux/proc: mount -t linprocfs linprocfs /compat/linux/proc SEE ALSO mount(2), unmount(2), auxv(3), linux(4), procfs(5), pseudofs(9) HISTORY The linprocfs first appeared in FreeBSD 4.0. AUTHORS The linprocfs was derived from procfs by Pierre Beyssac. This manual page was written by Dag-Erling Smorgrav, based on the procfs(5) manual page by Garrett Wollman. FreeBSD 15.1 December 26, 2025 LINPROCFS(4)
NAME | SYNOPSIS | DESCRIPTION | FILES | EXAMPLES | SEE ALSO | HISTORY | AUTHORS
Want to link to this manual page? Use this URL:
<https://man.freebsd.org/cgi/man.cgi?query=linprocfs&manpath=FreeBSD+15.1-RELEASE+and+Ports>