254 lines
6.9 KiB
Groff
254 lines
6.9 KiB
Groff
.\"
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.\" Copyright (c) 1992, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software donated to Berkeley by
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.\" Jan-Simon Pendry.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)mount_procfs.8 8.2 (Berkeley) 3/27/94
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.\"
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.\"
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.Dd March 27, 1994
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.Dt MOUNT_PROCFS 8
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.Os BSD 4.4
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.Sh NAME
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.Nm mount_procfs
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.Nd mount the process file system
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.Sh SYNOPSIS
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.Nm mount_procfs
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.Op Fl o Ar options
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.Pa /proc
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.Pa mount_point
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.Sh DESCRIPTION
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The
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.Nm mount_procfs
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command attaches an instance of the process
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namespace to the global filesystem namespace.
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The conventional mount point is
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.Pa /proc .
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This command is normally executed by
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.Xr mount 8
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at boot time.
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.Pp
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The options are as follows:
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.Bl -tag -width indent
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.It Fl o
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Options are specified with a
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.Fl o
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flag followed by a comma separated string of options.
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See the
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.Xr mount 8
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man page for possible options and their meanings.
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.El
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.Pp
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The root of the process filesystem
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contains an entry for each active process.
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These processes are visible as a directory whose
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name is the process' pid.
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In addition, the special entry
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.Pa curproc
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references the current process.
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.Pp
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Each directory contains several files.
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.Bl -tag -width status
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.It Pa ctl
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a writeonly file which supports a variety
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of control operations.
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Control commands are written as strings to the
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.Pa ctl
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file.
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The control commands are:
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.Bl -tag -width detach -compact
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.It attach
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stops the target process and arranges for the sending
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process to become the debug control process.
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.It detach
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continue execution of the target process and
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remove it from control by the debug process (which
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need not be the sending process).
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.It run
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continue running the target process until
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a signal is delivered, a breakpoint is hit, or the
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target process exits.
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.It step
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single step the target process, with no signal delivery.
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.It wait
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wait for the target process to come to a steady
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state ready for debugging.
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The target process must be in this state before
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any of the other commands are allowed.
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.El
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.Pp
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The string can also be the name of a signal, lower case
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and without the
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.Dv SIG
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prefix,
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in which case that signal is delivered to the process
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(see
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.Xr sigaction 2 ).
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.It Pa file
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A reference to the vnode 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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.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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Not implemented.
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.It Pa notepg
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Not implemented.
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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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.Pa <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 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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.Pa <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 status
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The process status.
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This file is readonly 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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.Ar major,minor
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of the controlling terminal, or
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.Dv -1,-1
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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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.El
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.El
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.Pp
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In a normal debugging environment,
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where the target is fork/exec'd by the debugger,
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the debugger should fork and the child should stop
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itself (with a self-inflicted
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.Dv SIGSTOP
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for example).
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The parent should issue a
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.Dv wait
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and then an
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.Dv attach
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command via the appropriate
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.Pa ctl
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file.
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The child process will receive a
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.Dv SIGTRAP
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immediately after the call to exec (see
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.Xr execve 2 ).
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.Sh FILES
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.Bl -tag -width /proc/curproc -compact
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.It Pa /proc/#
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.It Pa /proc/curproc
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.It Pa /proc/curproc/ctl
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.It Pa /proc/curproc/file
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.It Pa /proc/curproc/mem
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.It Pa /proc/curproc/note
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.It Pa /proc/curproc/notepg
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.It Pa /proc/curproc/regs
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.It Pa /proc/curproc/fpregs
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.It Pa /proc/curproc/status
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.El
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.Sh SEE ALSO
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.Xr sigaction 2 ,
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.Xr mount 2 ,
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.Xr unmount 2 ,
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.Sh CAVEATS
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No
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.Pa .
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and
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.Pa ..
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entries appear when listing the contents of the
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.Pa /proc
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directory.
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This makes sense in the context of this filesystem, but is inconsistent
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with usual filesystem conventions.
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However, it is still possible to refer to both
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.Pa .
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and
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.Pa ..
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in a pathname.
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.Pp
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This filesystem may not be NFS-exported
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since most of the functionality of
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.Dv procfs
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requires that state be maintained.
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.Sh HISTORY
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The
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.Nm mount_procfs
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utility first appeared in 4.4BSD.
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