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Man Pages


Manual Reference Pages  -  LINPROCFS (5)

NAME

linprocfs - Linux process file system

CONTENTS

Synopsis
Description
Files
Examples
See Also
History
Authors

SYNOPSIS

linproc         /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 node is a directory containing several files:
exe A reference to the vnode from which the process text was read. This can be used to gain access to the process’ symbol table, or to start another copy 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.

Each node is owned by the process’s user, and belongs to that user’s primary group, except for the mem node, which belongs to the kmem group.

FILES

/compat/linux/proc The normal mount point for the linprocfs.
/compat/linux/proc/cpuinfo CPU vendor and model information in human-readable form.
/compat/linux/proc/meminfo System memory information in human-readable form.
/compat/linux/proc/pid A directory containing process information for process pid.
/compat/linux/proc/self A directory containing process information for the current process.
/compat/linux/proc/self/exe The executable image for the current process.
/compat/linux/proc/self/mem The complete virtual address space of the current process.

EXAMPLES

To mount a linprocfs file system on /compat/linux/proc:

    mount -t linprocfs linproc /compat/linux/proc

SEE ALSO

mount(2), unmount(2), procfs(5), pseudofs(9)

HISTORY

The linprocfs first appeared in
.Fx 4.0 .

AUTHORS


.An -nosplit The linprocfs was derived from procfs by
.An Pierre Beyssac . This manual page was written by
.An Dag-Erling Sm\(/orgrav , based on the procfs(5) manual page by
.An Garrett Wollman .
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