1994-08-10 22:03:54 +02:00
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.\" $Id: procfs.5,v 1.1 1994/08/10 20:03:06 wollman Exp $
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1994-08-10 22:03:06 +02:00
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.\" Written by Garrett Wollman
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.\" This file is in the public domain.
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.\"
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.Dd August 10, 1994
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.Dt PROCFS 5
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.Os BSD 4.4
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.Sh NAME
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.Nm procfs
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.Nd process file system
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.Sh SYNOPSIS
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.Bd -literal
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proc /proc procfs rw 0 0
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1994-08-10 22:03:54 +02:00
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.Ed
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1994-08-10 22:03:06 +02:00
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.Sh DESCRIPTION
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The process file system, or
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.Nm ,
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implements a view of the system process table inside the file system.
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It is normally mounted on
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.Pa /proc ,
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and is required for the complete operation of programs such as
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.Xr ps 1
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and
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.Xr w 1 .
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.Pp
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The
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.Nm
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provides a two-level view of process space, unlike the previous
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.Fx 1.1
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.Nm
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implementation.
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At the highest level, processes themselves are named, according to
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their process ids in decimal, with no leading zeros. There is also a
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special node called
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.Pa curproc
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which always refers to the process making the lookup request.
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.Pp
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Each node is a directory which contains the following entries:
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.Bl -tag -width fpregsxx
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.It Pa file
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the executable image (not currently implemented)
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.It Pa status
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the process's current status
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.It Pa ctl
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used to send control messages to the process, such as might be used by
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a debugger
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.It Pa mem
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the complete virtual address space of the process
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.It Pa note
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used to send signals to the process (not currently implemented)
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.It Pa notepg
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used to send signals to the process group that the process belongs to
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(not currently implemented)
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.It Pa regs
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the process register set
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.El
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.Pp
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Each node is owned by the process's user, and belongs to that user's
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primary group, except for the
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.Pa mem
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node, which belongs to the
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.Li kmem
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group instead. (This is not yet true, but will be eventually.)
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.Pp
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This manual page should eventually document what you can do with all
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these nodes.
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.Sh FILES
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.Bl -tag -width /procxx
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.It Pa /proc
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normal mount point for the
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.Nm procfs .
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.El
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.Sh AUTHOR
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This manual page written by Garrett Wollman, based on the description
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provided by Jan-Simon Pendry.
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