path: root/man/1/emu

.TH EMU 1E
.SH NAME
emu \- Inferno emulator (hosted Inferno)
.SH SYNOPSIS
.B emu
[
.BI \-g " Xsize x Ysize"
]
[
.BI \-c n
]
[
.BI -d " daemon"
]
.RB [ \-s ]
[
.BI \-p " pool=maxsize"
]
[
.BI \-f " font"
]
[
.BI \-r " rootpath"
]
.RB [ \-7 ]
[
.RB \-C " channel"
]
[
.RB \-S
]
[
.B -v
]
[
.I cmd
.RI [ " arg ... " ]
]
.SH DESCRIPTION
.I Emu
provides the Inferno emulation environment,
otherwise known as `hosted Inferno'.
The emulator runs as an application under the
machine's native operating system, and
provides system services and a Dis virtual machine for Inferno applications.
.PP
.I Emu
starts an Inferno initialisation program
.BR /dis/emuinit.dis ,
whose path name is interpreted in the
Inferno file name space,
not in
the native operating system's name space.
It in turn invokes the shell
.BR /dis/sh.dis
by default or the optional
.I cmd
and its arguments.
If the
.B \-d
option is specified,
.I emu
instead invokes
.BR daemon ,
turning the
.I emu
instance into an Inferno service process on the network,
running the given
.I daemon
service or services.
.PP
The emulator supports the following options:
.TP
.BI \-c n
Unless specified otherwise by the module (see
.B wm/rt
in
.IR wm-misc (1)),
.I emu
uses an interpreter to execute Dis instructions.
Setting
.I n
to 1 (the default value is 0)
makes the default behaviour
to compile Dis
into native instructions when a module is loaded,
resulting in faster execution but larger run-time size.
Setting
.I n
to values larger than 1 enables increasingly detailed traces of the compiler.
.TP
.BI \-d " daemon"
Run 
.I emu
as a server, invoking
.I daemon
instead of
.BR /dis/emuinit.dis ,
and disabling
input from
.B cons
(see
.IR cons (3)).
.TP
.BI \-g Xsize x Ysize
Define screen width and height in pixels.
The default values are 640x480 and the minimum values are 64x48.
Values smaller than the minimum or greater than the
available display size are ignored.
.TP
.BI \-f font
Specify the default font for the
.B tk
module.
The path is interpreted in the Inferno name space.
If unspecified, the
.B font
variable has value
.BR /fonts/lucm/unicode.9.font .
.TP
.BI \-r rootpath
Specify the host system directory that
.I emu
will serve as its root.
The default value is
.B /usr/inferno
on most systems, but
.BR \einferno
on Windows.
.TP
.B \-s
Specify how the emulator deals with traps reported by the operating system.
By default, they suspend execution of the offending thread within the virtual machine
abstraction.
The
.B \-s
option causes
.I emu
itself to trap, permitting debugging of the
broken host operating system process that results when a trap occurs.
(This is intended to allow debugging of
.IR emu ,
not Inferno applications.)
.TP
.BI \-p pool = maxsize
Specify the maximum size in bytes of the named memory allocation pool.
The pools
are:
.RS
.TP \w'imagexxx'u
.B main
the general malloc arena
.TP
.B heap
the Dis virtual machine heap
.TP
.B image
image storage for the display
.RE
.TP
.B \-7
When host graphics is provided by X11, request a 7-bit colour map;
use this option only if X11 refused to allow
.I emu
to configure the normal (default) 8-bit Inferno colour map.
.TP
.B \-C channel
Use the given
.I channel
for the display, if possible.
See
.IR image (6)
for the full range of channel descriptors.
For example,
.B k8
gives 8 bit greyscale, and
.B x8r8g8b8
gives 24 bit colour on a PC.
The set of channels supported is platform-dependent.
.TP
.B \-S
Force stylus input behaviour for Tk mouse events:
motion events are received only when a button is down
(just as a stylus produces no events until it touches the screen).
This option only affects the behaviour of Tk mouse events, it does not
affect the behaviour of
.B /dev/pointer
as described in 
.IR cons (3).
.TP
.B \-v
Print version data: edition and revision date.
.PP
Options may also be set in the host operating system's environment variable
.BR EMU ;
they are overridden by options supplied on the command line.
.PP
.I Emu
finds the host system directory that will serve as its Inferno root directory
as the last value found as follows:
it is the value built-in to the executable, by default; or
the value of the host system's environment variable
.BR INFERNO ;
or the value of the environment variable
.BR ROOT ;
or the value of a
.B -r
option in the environment variable
.BR EMU ;
or the
.I rootpath
set by a
.B -r
option to the
.I emu
command itself.
.PP
.I Emu
sets several Inferno environment variables:
.TF emuwdirxxx
.PD
.TP
.B cputype
host processor architecture:
.B 386
(for any x86),
.BR arm ,
.BR mips ,
.B power
(any Power or PowerPC),
.BR sparc ,
and
.BR spim
(little-endian MIPS).
.TP
.B emuargs
arguments with which
.I emu
was invoked
.TP
.B emuhost
host operating system type, such as:
.BR FreeBSD ,
.BR Irix ,
.BR Linux ,
.BR MacOSX ,
.BR NetBSD ,
.BR Nt
(used for Windows generally),
.BR OpenBSD ,
.BR Plan9 ,
.B Solaris
and
.BR Unixware .
.TP
.B emuroot
name of directory in host file system that acts as Inferno's root directory
.TP
.B emuwdir
name in host file system of directory where
.I emu
was invoked
.PD
.SH EXAMPLE
To start
.B wm/logon
directly:
.IP
.EX
EMU='-g800x600 -c1'
emu /dis/wm/wm.dis wm/logon -u inferno
.EE
.SH FILES
.TF /dis/emuinit.dis
.TP
.B /dis/emuinit.dis
The default initialisation program.
.TP
.B /dis/sh.dis
The default Inferno shell.
.SH SOURCE
.B /emu
.SH "SEE ALSO"
.IR limbo (1),
.IR wm-misc (1)