Get rid of the last vestiges of the old MOUNT_* constants in the

mount_* programs.  While we're at it, collapse the four now-identical
mount programs for devfs, fdesc, kernfs, and procfs into links to
a new mount_std(8) which can mount any really generic filesystem
such as these when called with the appropriate argv[0].

Also, convert the mount programs to use sysexits.h.

7 files changed, 917 insertions, 0 deletions

diff --git a/sbin/mount_std/Makefile b/sbin/mount_std/Makefile
new file mode 100644
index 0000000..ff01131
--- /dev/null
+++ b/sbin/mount_std/Makefile
@@ -0,0 +1,16 @@
+#	@(#)Makefile	8.2 (Berkeley) 3/27/94
+
+PROG=	mount_std
+SRCS=	mount_std.c getmntopts.c
+MAN8=	mount_std.8 mount_devfs.8 mount_fdesc.8 mount_kernfs.8 mount_procfs.8
+
+MOUNT=	${.CURDIR}/../mount
+CFLAGS+= -I${MOUNT}
+.PATH:	${MOUNT}
+
+LINKS=	${BINDIR}/mount_std ${BINDIR}/mount_devfs \
+	${BINDIR}/mount_std ${BINDIR}/mount_fdesc \
+	${BINDIR}/mount_std ${BINDIR}/mount_kernfs \
+	${BINDIR}/mount_std ${BINDIR}/mount_procfs
+
+.include <bsd.prog.mk>
diff --git a/sbin/mount_std/mount_devfs.8 b/sbin/mount_std/mount_devfs.8
new file mode 100644
index 0000000..8c4d63a
--- /dev/null
+++ b/sbin/mount_std/mount_devfs.8
@@ -0,0 +1,90 @@
+.\"
+.\" Copyright (c) 1992, 1993, 1994
+.\"	The Regents of the University of California.  All rights reserved.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software donated to Berkeley by
+.\" Jan-Simon Pendry.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"	This product includes software developed by the University of
+.\"	California, Berkeley and its contributors.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"	@(#)mount_devfs.8	8.2 (Berkeley) 3/27/94
+.\"
+.\"
+.Dd March 27, 1994
+.Dt MOUNT_DEFVS 8
+.Os FreeBSD 2.0
+.Sh NAME
+.Nm mount_devfs
+.Nd mount the /devs file system
+.Sh SYNOPSIS
+.Nm mount_devfs
+.Op Fl o Ar options
+.Ar "devfs"
+.Ar mount_point
+.Sh DESCRIPTION
+The
+.Nm mount_devfs
+command attaches an instance of the kernel's device
+namespace to the global filesystem namespace.
+The conventional mount point is
+.Pa /devs .
+This command is normally executed by
+.Xr mount 8
+at boot time.
+.Pp
+The filesystem includes several directories, links, symbolic links and devices,
+some of which can also be written.
+In a chroot'ed environment,
+.Nm
+can be used to create a new
+.Pa /devs
+mount point.
+.Pp
+The options are as follows:
+.Bl -tag -width indent
+.It Fl o
+Options are specified with a
+.Fl o
+flag followed by a comma separated string of options.
+See the
+.Xr mount 8
+man page for possible options and their meanings.
+.El
+.Sh SEE ALSO
+.Xr mount 2 ,
+.Xr unmount 2 ,
+.Xr fstab 5 ,
+.Xr mount 8
+.Sh CAVEATS
+This filesystem may not be NFS-exported.
+.Sh HISTORY
+The
+.Nm mount_devfs
+utility first appeared in FreeBSD 2.0
diff --git a/sbin/mount_std/mount_fdesc.8 b/sbin/mount_std/mount_fdesc.8
new file mode 100644
index 0000000..a61c952
--- /dev/null
+++ b/sbin/mount_std/mount_fdesc.8
@@ -0,0 +1,171 @@
+.\"
+.\" Copyright (c) 1992, 1993, 1994
+.\"	The Regents of the University of California.  All rights reserved.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software donated to Berkeley by
+.\" Jan-Simon Pendry.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"	This product includes software developed by the University of
+.\"	California, Berkeley and its contributors.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"	@(#)mount_fdesc.8	8.2 (Berkeley) 3/27/94
+.\"
+.\"
+.Dd March 27, 1994
+.Dt MOUNT_FDESC 8
+.Os BSD 4.4
+.Sh NAME
+.Nm mount_fdesc
+.Nd mount the file-descriptor file system
+.Sh SYNOPSIS
+.Nm mount_fdesc
+.Op Fl o Ar options
+.Ar fdesc
+.Ar mount_point
+.Sh DESCRIPTION
+The
+.Nm mount_fdesc
+command attaches an instance of the per-process file descriptor
+namespace to the global filesystem namespace.
+The conventional mount point is
+.Pa /dev
+and the filesystem should be union mounted in order to augment,
+rather than replace, the existing entries in
+.Pa /dev .
+This command is normally executed by
+.Xr mount 8
+at boot time.
+.Pp
+The options are as follows:
+.Bl -tag -width indent
+.It Fl o
+Options are specified with a
+.Fl o
+flag followed by a comma separated string of options.
+See the
+.Xr mount 8
+man page for possible options and their meanings.
+.El
+.Pp
+The contents of the mount point are
+.Pa fd ,
+.Pa stderr ,
+.Pa stdin ,
+.Pa stdout 
+and
+.Pa tty .
+.Pp
+.Pa fd
+is a directory whose contents
+appear as a list of numbered files
+which correspond to the open files of the process reading the
+directory.
+The files
+.Pa /dev/fd/0
+through
+.Pa /dev/fd/#
+refer to file descriptors which can be accessed through the file
+system.
+If the file descriptor is open and the mode the file is being opened
+with is a subset of the mode of the existing descriptor, the call:
+.Bd -literal -offset indent
+fd = open("/dev/fd/0", mode);
+.Ed
+.Pp
+and the call:
+.Bd -literal -offset indent
+fd = fcntl(0, F_DUPFD, 0);
+.Ed
+.Pp
+are equivalent.
+.Pp
+The files
+.Pa /dev/stdin ,
+.Pa /dev/stdout
+and
+.Pa /dev/stderr
+appear as symlinks to the relevant entry in the
+.Pa /dev/fd
+sub-directory.
+Opening them is equivalent to the following calls:
+.Bd -literal -offset indent
+fd = fcntl(STDIN_FILENO,  F_DUPFD, 0);
+fd = fcntl(STDOUT_FILENO, F_DUPFD, 0);
+fd = fcntl(STDERR_FILENO, F_DUPFD, 0);
+.Ed
+.Pp
+Flags to the
+.Xr open 2
+call other than
+.Dv O_RDONLY , 
+.Dv O_WRONLY
+and
+.Dv O_RDWR
+are ignored.
+.Pp
+The
+.Pa /dev/tty
+entry is an indirect reference to the current process's controlling terminal.
+It appears as a named pipe (FIFO) but behaves in exactly the same way as
+the real controlling terminal device.
+.Sh FILES
+.Bl -tag -width /dev/stderr -compact
+.It Pa /dev/fd/#
+.It Pa /dev/stdin
+.It Pa /dev/stdout
+.It Pa /dev/stderr
+.It Pa /dev/tty
+.El
+.Sh SEE ALSO
+.Xr mount 2 ,
+.Xr unmount 2 ,
+.Xr tty 4 ,
+.Xr fstab 5 ,
+.Xr mount 8
+.Sh CAVEATS
+No
+.Pa .
+and
+.Pa ..
+entries appear when listing the contents of the
+.Pa /dev/fd
+directory.
+This makes sense in the context of this filesystem, but is inconsistent
+with usual filesystem conventions.
+However, it is still possible to refer to both
+.Pa .
+and 
+.Pa ..
+in a pathname.
+.Pp
+This filesystem may not be NFS-exported.
+.Sh HISTORY
+The
+.Nm mount_fdesc
+utility first appeared in 4.4BSD.
diff --git a/sbin/mount_std/mount_kernfs.8 b/sbin/mount_std/mount_kernfs.8
new file mode 100644
index 0000000..787c174
--- /dev/null
+++ b/sbin/mount_std/mount_kernfs.8
@@ -0,0 +1,131 @@
+.\"
+.\" Copyright (c) 1992, 1993, 1994
+.\"	The Regents of the University of California.  All rights reserved.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software donated to Berkeley by
+.\" Jan-Simon Pendry.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"	This product includes software developed by the University of
+.\"	California, Berkeley and its contributors.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"	@(#)mount_kernfs.8	8.2 (Berkeley) 3/27/94
+.\"
+.\"
+.Dd March 27, 1994
+.Dt MOUNT_KERNFS 8
+.Os BSD 4.4
+.Sh NAME
+.Nm mount_kernfs
+.Nd mount the /kern file system
+.Sh SYNOPSIS
+.Nm mount_kernfs
+.Op Fl o Ar options
+.Ar /kern
+.Ar mount_point
+.Sh DESCRIPTION
+The
+.Nm mount_kern
+command attaches an instance of the kernel parameter
+namespace to the global filesystem namespace.
+The conventional mount point is
+.Pa /kern .
+This command is normally executed by
+.Xr mount 8
+at boot time.
+.Pp
+The filesystem includes several regular files which can be read,
+some of which can also be written.
+The contents of the files is in a machine-independent format,
+either a string, or an integer in decimal ASCII.
+Where numbers are returned, a trailing newline character is also added.
+.Pp
+The options are as follows:
+.Bl -tag -width indent
+.It Fl o
+Options are specified with a
+.Fl o
+flag followed by a comma separated string of options.
+See the
+.Xr mount 8
+man page for possible options and their meanings.
+.El
+.Sh FILES
+.Bl -tag -width copyright -compact
+.It Pa boottime
+the time at which the system was last booted (decimal ASCII).
+.It Pa copyright
+kernel copyright message.
+.It Pa hostname
+the hostname, with a trailing newline.
+The hostname can be changed by writing to this file.
+A trailing newline will be stripped from the hostname being written.
+.It Pa hz
+the frequency of the system clock (decimal ASCII).
+.It Pa loadavg
+the 1, 5 and 15 minute load average in kernel fixed-point format.
+The final integer is the fix-point scaling factor.
+All numbers are in decimal ASCII.
+.It Pa pagesize
+the machine pagesize (decimal ASCII).
+.It Pa physmem
+the number of pages of physical memory in the machine (decimal ASCII).
+.It Pa root
+the system root directory.
+In a chroot'ed environment,
+.Nm
+can be used to create a new
+.Pa /kern
+mount point.
+.Pa /kern/root
+will then refer to the system global root, not the current process root.
+.It Pa rootdev
+the root device.
+.It Pa rrootdev
+the raw root device.
+.It Pa time
+the second and microsecond value of the system clock.
+Both numbers are in decimal ASCII.
+.It Pa version
+the kernel version string.
+The head line for
+.Pa /etc/motd
+can be generated by running:
+.Dq Ic "sed 1q /kern/version"
+.El
+.Sh SEE ALSO
+.Xr mount 2 ,
+.Xr unmount 2 ,
+.Xr fstab 5 ,
+.Xr mount 8
+.Sh CAVEATS
+This filesystem may not be NFS-exported.
+.Sh HISTORY
+The
+.Nm mount_kernfs
+utility first appeared in 4.4BSD.
diff --git a/sbin/mount_std/mount_procfs.8 b/sbin/mount_std/mount_procfs.8
new file mode 100644
index 0000000..3aa20e0
--- /dev/null
+++ b/sbin/mount_std/mount_procfs.8
@@ -0,0 +1,253 @@
+.\"
+.\" Copyright (c) 1992, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software donated to Berkeley by
+.\" Jan-Simon Pendry.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"	This product includes software developed by the University of
+.\"	California, Berkeley and its contributors.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"	@(#)mount_procfs.8	8.2 (Berkeley) 3/27/94
+.\"
+.\"
+.Dd March 27, 1994
+.Dt MOUNT_PROCFS 8
+.Os BSD 4.4
+.Sh NAME
+.Nm mount_procfs
+.Nd mount the process file system
+.Sh SYNOPSIS
+.Nm mount_procfs
+.Op Fl o Ar options
+.Pa /proc
+.Pa mount_point
+.Sh DESCRIPTION
+The
+.Nm mount_procfs
+command attaches an instance of the process
+namespace to the global filesystem namespace.
+The conventional mount point is
+.Pa /proc .
+This command is normally executed by
+.Xr mount 8
+at boot time.
+.Pp
+The options are as follows:
+.Bl -tag -width indent
+.It Fl o
+Options are specified with a
+.Fl o
+flag followed by a comma separated string of options.
+See the
+.Xr mount 8
+man page for possible options and their meanings.
+.El
+.Pp
+The root of the process filesystem
+contains an entry for each active process.
+These processes are visible as a directory whose
+name is the process' pid.
+In addition, the special entry
+.Pa curproc
+references the current process.
+.Pp
+Each directory contains several files.
+.Bl -tag -width status
+.It Pa ctl
+a writeonly file which supports a variety
+of control operations.
+Control commands are written as strings to the
+.Pa ctl
+file.
+The control commands are:
+.Bl -tag -width detach -compact
+.It attach
+stops the target process and arranges for the sending
+process to become the debug control process.
+.It detach
+continue execution of the target process and
+remove it from control by the debug process (which
+need not be the sending process).
+.It run
+continue running the target process until
+a signal is delivered, a breakpoint is hit, or the
+target process exits.
+.It step
+single step the target process, with no signal delivery.
+.It wait
+wait for the target process to come to a steady
+state ready for debugging.
+The target process must be in this state before
+any of the other commands are allowed.
+.El
+.Pp
+The string can also be the name of a signal, lower case
+and without the
+.Dv SIG
+prefix,
+in which case that signal is delivered to the process
+(see
+.Xr sigaction 2 ).
+.It Pa 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.
+.It Pa mem
+The complete virtual memory image of the process.
+Only those address 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.
+.It Pa note
+Not implemented.
+.It Pa notepg
+Not implemented.
+.It Pa regs
+Allows read and write access to the process' register set.
+This file contains a binary data structure
+.Dv "struct regs"
+defined in
+.Pa <machine/reg.h> .
+.Pa regs
+can only be written when the process is stopped.
+.It Pa fpregs
+The floating point registers as defined by
+.Dv "struct fpregs"
+in
+.Pa <machine/reg.h> .
+.Pa fpregs
+is only implemented on machines which have distinct general
+purpose and floating point register sets.
+.It Pa status
+The process status.
+This file is readonly and returns a single line containing
+multiple space-separated fields as follows:
+.Pp
+.Bl -bullet -compact
+.It
+command name
+.It
+process id
+.It
+parent process id
+.It
+process group id
+.It
+session id
+.It
+.Ar major,minor
+of the controlling terminal, or
+.Dv -1,-1
+if there is no controlling terminal.
+.It
+a list of process flags:
+.Dv ctty
+if there is a controlling terminal,
+.Dv sldr
+if the process is a session leader,
+.Dv noflags
+if neither of the other two flags are set.
+.It
+the process start time in seconds and microseconds,
+comma separated.
+.It
+the user time in seconds and microseconds,
+comma separated.
+.It
+the system time in seconds and microseconds,
+comma separated.
+.It
+the wait channel message
+.It
+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.
+.El
+.El
+.Pp
+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
+.Dv SIGSTOP
+for example).
+The parent should issue a
+.Dv wait
+and then an
+.Dv attach
+command via the appropriate
+.Pa ctl
+file.
+The child process will receive a
+.Dv SIGTRAP
+immediately after the call to exec (see
+.Xr execve 2 ).
+.Sh FILES
+.Bl -tag -width /proc/curproc -compact
+.It Pa /proc/#
+.It Pa /proc/curproc
+.It Pa /proc/curproc/ctl
+.It Pa /proc/curproc/file
+.It Pa /proc/curproc/mem
+.It Pa /proc/curproc/note
+.It Pa /proc/curproc/notepg
+.It Pa /proc/curproc/regs
+.It Pa /proc/curproc/fpregs
+.It Pa /proc/curproc/status
+.El
+.Sh SEE ALSO
+.Xr sigaction 2 ,
+.Xr mount 2 ,
+.Xr unmount 2 ,
+.Sh CAVEATS
+No
+.Pa .
+and
+.Pa ..
+entries appear when listing the contents of the
+.Pa /proc
+directory.
+This makes sense in the context of this filesystem, but is inconsistent
+with usual filesystem conventions.
+However, it is still possible to refer to both
+.Pa .
+and 
+.Pa ..
+in a pathname.
+.Pp
+This filesystem may not be NFS-exported
+since most of the functionality of
+.Dv procfs
+requires that state be maintained.
+.Sh HISTORY
+The
+.Nm mount_procfs
+utility first appeared in 4.4BSD.
diff --git a/sbin/mount_std/mount_std.8 b/sbin/mount_std/mount_std.8
new file mode 100644
index 0000000..f8d22a4
--- /dev/null
+++ b/sbin/mount_std/mount_std.8
@@ -0,0 +1,134 @@
+.\"
+.\" Copyright (c) 1992, 1993, 1994
+.\"	The Regents of the University of California.  All rights reserved.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software donated to Berkeley by
+.\" Jan-Simon Pendry.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"	This product includes software developed by the University of
+.\"	California, Berkeley and its contributors.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"	$Id$
+.\"
+.Dd May 13, 1996
+.Dt MOUNT_STD 8
+.Os FreeBSD 2.2
+.Sh NAME
+.Nm mount_std
+.Nd mount ``standard'' filesystems
+.Sh SYNOPSIS
+.Nm mount_ Ns Ar fsname
+.Op Fl o Ar options
+.Ar "devfs"
+.Ar mount_point
+.Sh DESCRIPTION
+The
+.Nm
+command is a generic mechanism for attaching ``standard'' filesystems to
+the filesystem.  A ``standard'' filesystem is one which:
+.Bl -enum -offset indent
+.It
+accepts only the standard
+.Fl o
+options
+.Dq ro
+.Pq ``rdonly'' ,
+.Dq rw ,
+.Dq nodev ,
+.Dq noexec ,
+.Dq nosuid ,
+and
+.Dq union .
+.It
+has a kernel filesystem module name the same as its user-visible name.
+.It
+requires no other special processing on the part of the
+.Nm mount_std
+command.
+.El
+.Pp
+The
+.Nm
+command examines its zeroth command-line argument (the name by which
+it was called) to determine the type of filesystem to be mounted.  If
+it is called by a name which does not end in
+.Dq Li _ Ns Ar fsname ,
+.Nm
+will issue a diagnostic and return an error.  The
+.Nm
+command is normally installed with appropriate links to commands for
+the distributed filesystems which can be mounted in this way;
+for information on the function of each filesystem, see the manual page
+for that specific
+.Nm mount_ Ns Ar fsname
+command.
+.Sh DIAGNOSTICS
+.Bl -diag
+.It argv[0] must end in _fsname
+The
+.Nm mount_std
+command was called with a zero'th argument which does not specify a
+filesystem type to be mounted.
+.It vfsload(%s)
+.Nm
+was unable to load a kernel module implementing the %s filesystem
+type.
+.It %s filesystem not available
+The specified filesystem type was not present in the kernel and no
+loadable module for it was found.
+.El
+.Sh SEE ALSO
+.Xr mount 2 ,
+.Xr unmount 2 ,
+.Xr getvfsbyname 3 ,
+.Xr fstab 5 ,
+.Xr mount 8 ,
+.Xr mount_devfs 8 ,
+.Xr mount_fdesc 8 ,
+.Xr mount_kernfs 8 ,
+.Xr mount_procfs 8
+.Sh HISTORY
+The
+.Nm mount_std
+utility first appeared in
+.Fx 2.2 .
+Loadable filesystem modules first appeared in
+.Fx 2.0 .
+The
+.Dq fdesc ,
+.Dq kernfs ,
+and
+.Dq procfs
+filesystem types first appeared in
+.Fx 2.0 ;
+the
+.Dq devfs
+filesystem type first appeared in
+.Fx 2.2 .
+
diff --git a/sbin/mount_std/mount_std.c b/sbin/mount_std/mount_std.c
new file mode 100644
index 0000000..5d0615a
--- /dev/null
+++ b/sbin/mount_std/mount_std.c
@@ -0,0 +1,122 @@
+/*
+ * Copyright (c) 1990, 1992 Jan-Simon Pendry
+ * Copyright (c) 1992, 1993, 1994
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Jan-Simon Pendry.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef lint
+char copyright[] =
+"@(#) Copyright (c) 1992, 1993, 1994\n\
+	The Regents of the University of California.  All rights reserved.\n";
+#endif /* not lint */
+
+#ifndef lint
+static const char rcsid[] =
+	"$Id$";
+#endif /* not lint */
+
+#include <sys/param.h>
+#include <sys/mount.h>
+
+#include <err.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sysexits.h>
+#include <unistd.h>
+
+#include "mntopts.h"
+
+static struct mntopt mopts[] = {
+	MOPT_STDOPTS,
+	{ NULL }
+};
+
+static __dead void	usage __P((void)) __dead2;
+static const char *fsname;
+
+int
+main(argc, argv)
+	int argc;
+	char *argv[];
+{
+	int ch, mntflags;
+	struct vfsconf *vfc;
+
+	fsname = strrchr(argv[0], '_');
+	if (!fsname || strcmp(fsname, "_std") == 0)
+		errx(EX_USAGE, "argv[0] must end in _fsname");
+
+	fsname++;
+
+	mntflags = 0;
+	while ((ch = getopt(argc, argv, "o:")) != EOF)
+		switch (ch) {
+		case 'o':
+			getmntopts(optarg, mopts, &mntflags, 0);
+			break;
+		case '?':
+		default:
+			usage();
+		}
+	argc -= optind;
+	argv += optind;
+
+	if (argc != 2)
+		usage();
+
+	vfc = getvfsbyname(fsname);
+	if(!vfc && vfsisloadable(fsname)) {
+		if(vfsload(fsname)) {
+			err(EX_OSERR, "vfsload(%s)", fsname);
+		}
+		endvfsent();
+		vfc = getvfsbyname(fsname);
+	}
+	if (!vfc)
+		errx(EX_OSERR, "%s filesystem not available", fsname);
+
+	if (mount(vfc->vfc_index, argv[1], mntflags, NULL))
+		err(EX_OSERR, NULL);
+	exit(0);
+}
+
+void
+usage()
+{
+	(void)fprintf(stderr,
+		"usage: mount_%s [-o options] what_to_mount mount_point\n",
+		      fsname);
+	exit(EX_USAGE);
+}