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NetBSD 6.1.5 - man page for mount_procfs (netbsd section 8)

MOUNT_PROCFS(8) 		   BSD System Manager's Manual			  MOUNT_PROCFS(8)

NAME
     mount_procfs -- mount the process file system

SYNOPSIS
     mount_procfs [-o options] /proc mount_point

DESCRIPTION
     The mount_procfs command attaches an instance of the process namespace to the global
     filesystem namespace.  The conventional mount point is /proc.  The directory specified by
     mount_point is converted to an absolute path before use.  This command is normally executed
     by mount(8) at boot time.

     The options are as follows:

     -o nolinux
	     Do not support nodes which are not part of the original procfs implementation but
	     have been added for compatibility with the Linux procfs namespace.  See FILES for
	     more information.

     The root of the process filesystem contains an entry for each active process.  These pro-
     cesses are visible as a directory whose name is the process' pid.	In addition, the special
     entries curproc and self reference the current process.  The self symlink appears for com-
     patibility with the Linux procfs implementation.

     Each directory contains several files.

     cmdline
	     This file is readonly and returns null-terminated strings corresponding to the
	     process' command line arguments.  For a system or zombie process, this file contains
	     only a string with the name of the process.

     ctl     a writeonly file which supports a variety of control operations.  Control commands
	     are written as strings to the ctl file.  The control commands are:
	     attach  stops the target process and arranges for the sending process to become the
		     debug control process.
	     detach  continue execution of the target process and remove it from control by the
		     debug process.
	     run     continue running the target process until a signal is delivered, a break-
		     point is hit, or the target process exits.
	     step    single step the target process, with no signal delivery.
	     wait    wait for the target process to stop.  The target process must be stopped
		     before any of the run, step, or signal commands are allowed.

	     The string can also be the name of a signal, lower case and without the SIG prefix,
	     in which case that signal is delivered to the process (see sigaction(2)).

     cwd     A symbolic link that points to the current working directory of the process.  If the
	     target process's current working directory is not available or is not at or below
	     the current process's root directory, this link will point to ``/''.

     fd/#    File descriptors which can be accessed through the file system.  See fd(4) for more
	     information.

     file    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.

     map     A map of the process' virtual memory.

     maps    A map of the process' virtual memory in a form like the proc filesystem as imple-
	     mented in Linux.  Note that the paths corresponding to file backed mappings will not
	     be present unless the kernel was built with the NAMECACHE_ENTER_REVERSE option.

     mem     The complete virtual memory image of the process.	Only those addresses which exist
	     in the process can be accessed.  Writes to this file modify the process.  Writes to
	     the text segment normally remain private to the process, since the text segment is
	     mapped with MAP_PRIVATE; however, this is not guaranteed.

     note    Not implemented.

     notepg  Not implemented.

     regs    Allows read and write access to the process' register set.  This file contains a
	     binary data structure struct regs defined in <machine/reg.h>.  regs can only be
	     written when the process is stopped.

     fpregs  The floating point registers as defined by struct fpregs in <machine/reg.h>.  fpregs
	     is only implemented on machines which have distinct general purpose and floating
	     point register sets.

     root    A symbolic link that points to the root directory of the process.	If the target
	     process's root directory is not available or is not at or below the current
	     process's root directory, this link will point to ``/''.

     status  The process status.  This file is readonly and returns a single line containing mul-
	     tiple space-separated fields as follows:

	     o	 command name
	     o	 process id
	     o	 parent process id
	     o	 process group id
	     o	 session id
	     o	 major,minor of the controlling terminal, or -1,-1 if there is no controlling
		 terminal.
	     o	 a list of process flags: ctty if there is a controlling terminal, sldr if the
		 process is a session leader, noflags if neither of the other two flags are set.
	     o	 the process start time in seconds and microseconds, comma separated.
	     o	 the user time in seconds and microseconds, comma separated.
	     o	 the system time in seconds and microseconds, comma separated.
	     o	 the wait channel message
	     o	 the process credentials consisting of the effective user id and the list of
		 groups (whose first member is the effective group id) all comma separated.

     In a normal debugging environment, where the target is fork/exec'd by the debugger, the
     debugger should fork and the child should stop itself (with a self-inflicted SIGSTOP for
     example).	The parent should issue a wait and then an attach command via the appropriate ctl
     file.  The child process will receive a SIGTRAP immediately after the call to exec (see
     execve(2)).

FILES
     /proc/#
     /proc/#/cmdline
     /proc/#/ctl
     /proc/#/cwd
     /proc/#/exe
     /proc/#/file
     /proc/#/fpregs
     /proc/#/map
     /proc/#/maps
     /proc/#/mem
     /proc/#/note
     /proc/#/notepg
     /proc/#/regs
     /proc/#/root
     /proc/#/status
     /proc/curproc
     /proc/self

     If the linux mount option is used, the following files are also available:

     /proc/#/stat
     /proc/cpuinfo
     /proc/devices
     /proc/meminfo
     /proc/mounts
     /proc/uptime

SEE ALSO
     mount(2), sigaction(2), unmount(2)

HISTORY
     The mount_procfs utility first appeared in 4.4BSD.

BUGS
     This filesystem may not be NFS-exported since most of the functionality of procfs requires
     that state be maintained.

BSD					February 24, 2009				      BSD


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