99b14d9f1b
This interface has no in-tree consumers and has been more or less non-functional for several releases. Remove manpage note that the procfs special file 'mem' is grouped to kmem. This hasn't been true since r81107. Remove procfs' README file. It is an out of date duplication of the manpage (quoth the README: "since the bsd kernel is single-processor..."). Reviewed by: vangyzen, bcr (manpage) Approved by: des (procfs maintainer), vangyzen (mentor) Differential Revision: https://reviews.freebsd.org/D9802
210 lines
5.0 KiB
Groff
210 lines
5.0 KiB
Groff
.\" $FreeBSD$
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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 March 4, 2017
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.Dt PROCFS 5
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.Os
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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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.Ed
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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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.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.
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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 status
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.It Pa dbregs
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The debug registers as defined by
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.Dv "struct dbregs"
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in
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.In machine/reg.h .
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.Pa dbregs
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is currently only implemented on the i386 architecture.
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.It Pa etype
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The type of the executable referenced by the
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.Pa file
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entry.
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.It Pa file
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A symbolic link to the file from which the process text was read.
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This can be used to gain access to the process' symbol table,
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or to start another copy of the process.
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If the file cannot be found, the link target is
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.Ql unknown .
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.It Pa fpregs
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The floating point registers as defined by
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.Dv "struct fpregs"
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in
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.In machine/reg.h .
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.Pa fpregs
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is only implemented on machines which have distinct general
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purpose and floating point register sets.
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.It Pa map
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A map of the process' virtual memory.
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.It Pa mem
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The complete virtual memory image of the process.
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Only those address which exist in the process can be accessed.
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Reads and writes to this file modify the process.
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Writes to the text segment remain private to the process.
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.It Pa note
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Used for sending signals to the process.
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Not implemented.
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.It Pa notepg
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Used for sending signal to the process group.
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Not implemented.
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.It Pa osrel
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Allows read and write of the kernel osrel value assigned to the process.
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It affects the compatibility shims that are turned on and off
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depending on the value.
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Initial process value is read from the ABI note tag in the executed ELF image,
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and is zero if the tag not supported by binary format or was not found.
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.It Pa regs
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Allows read and write access to the process' register set.
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This file contains a binary data structure
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.Dv "struct regs"
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defined in
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.In machine/reg.h .
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.Pa regs
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can only be written when the process is stopped.
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.It Pa rlimit
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This is a read-only file containing the process current and maximum
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limits.
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Each line is of the format
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.Ar rlimit current max ,
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with -1
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indicating infinity.
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.It Pa status
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The process status.
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This file is read-only and returns a single line containing
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multiple space-separated fields as follows:
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.Pp
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.Bl -bullet -compact
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.It
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command name
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.It
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process id
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.It
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parent process id
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.It
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process group id
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.It
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session id
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.It
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device name
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of the controlling terminal, or
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a minus sign
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.Pq Dq -
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if there is no controlling terminal.
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.It
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a list of process flags:
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.Dv ctty
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if there is a controlling terminal,
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.Dv sldr
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if the process is a session leader,
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.Dv noflags
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if neither of the other two flags are set.
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.It
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the process start time in seconds and microseconds,
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comma separated.
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.It
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the user time in seconds and microseconds,
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comma separated.
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.It
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the system time in seconds and microseconds,
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comma separated.
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.It
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the wait channel message
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.It
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the process credentials consisting of
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the effective user id
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and the list of groups (whose first member
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is the effective group id)
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all comma separated.
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.It
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the hostname of the jail in which the process runs, or
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.Ql -
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to indicate that the process is not running within a jail.
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.El
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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.
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.Sh FILES
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.Bl -tag -width /proc/curproc/XXXXXXX -compact
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.It Pa /proc
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normal mount point for the
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.Nm .
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.It Pa /proc/pid
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directory containing process information for process
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.Pa pid .
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.It Pa /proc/curproc
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directory containing process information for the current process
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.It Pa /proc/curproc/cmdline
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the process executable name
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.It Pa /proc/curproc/etype
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executable type
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.It Pa /proc/curproc/file
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executable image
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.It Pa /proc/curproc/fpregs
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the process floating point register set
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.It Pa /proc/curproc/map
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virtual memory map of the process
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.It Pa /proc/curproc/mem
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the complete virtual address space of the process
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.It Pa /proc/curproc/note
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used for signaling the process
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.It Pa /proc/curproc/notepg
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used for signaling the process group
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.It Pa /proc/curproc/osrel
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the process osrel value
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.It Pa /proc/curproc/regs
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the process register set
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.It Pa /proc/curproc/rlimit
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the process current and maximum rlimit
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.It Pa /proc/curproc/status
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the process' current status
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.El
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.Sh EXAMPLES
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To mount a
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.Nm
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file system on
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.Pa /proc :
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.Pp
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.Dl "mount -t procfs proc /proc"
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.Sh SEE ALSO
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.Xr procstat 1 ,
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.Xr mount 2 ,
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.Xr sigaction 2 ,
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.Xr unmount 2 ,
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.Xr procctl 8 ,
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.Xr pseudofs 9
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.Sh AUTHORS
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.An -nosplit
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This manual page written by
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.An Garrett Wollman ,
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based on the description
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provided by
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.An Jan-Simon Pendry ,
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and revamped later by
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.An Mike Pritchard .
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