EMU(1E) EMU(1E)
NAME
emu - Inferno emulator (hosted Inferno)
SYNOPSIS
emu [ -g Xsize x Ysize ] [ -cn ] [ -d daemon ] [-s] [ -p
pool=maxsize ] [ -f font ] [ -r rootpath ] [-7] [ -C channel
] [ -S ] [ -v ] [ cmd [ arg ... ] ]
DESCRIPTION
Emu provides the Inferno emulation environment, otherwise
known as `hosted Inferno'. The emulator runs as an applica-
tion under the machine's native operating system, and pro-
vides system services and a Dis virtual machine for Inferno
applications.
Emu starts an Inferno initialisation program
/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
/dis/sh.dis by default or the optional cmd and its argu-
ments. If the -d option is specified, emu instead invokes
daemon, turning the emu instance into an Inferno service
process on the network, running the given daemon service or
services.
The emulator supports the following options:
-cn Unless specified otherwise by the module (see wm/rt in
wm-misc(1)), emu uses an interpreter to execute Dis
instructions. Setting 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 fas-
ter execution but larger run-time size. Setting n to
values larger than 1 enables increasingly detailed
traces of the compiler.
-d daemon
Run emu as a server, invoking daemon instead of
/dis/emuinit.dis, and disabling input from cons (see
cons(3)).
-gXsizexYsize
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.
-ffont
Specify the default font for the tk module. The path
is interpreted in the Inferno name space. If
Page 1 Plan 9 (printed 11/17/24)
EMU(1E) EMU(1E)
unspecified, the font variable has value
/fonts/lucm/unicode.9.font.
-rrootpath
Specify the host system directory that emu will serve
as its root. The default value is /usr/inferno on most
systems, but \inferno on Windows.
-s Specify how the emulator deals with traps reported by
the operating system. By default, they suspend execu-
tion of the offending thread within the virtual machine
abstraction. The -s option causes emu itself to trap,
permitting debugging of the broken host operating sys-
tem process that results when a trap occurs. (This is
intended to allow debugging of emu, not Inferno appli-
cations.)
-ppool=maxsize
Specify the maximum size in bytes of the named memory
allocation pool. The pools are:
main the general malloc arena
heap the Dis virtual machine heap
image image storage for the display
-7 When host graphics is provided by X11, request a 7-bit
colour map; use this option only if X11 refused to
allow emu to configure the normal (default) 8-bit
Inferno colour map.
-C channel
Use the given channel for the display, if possible.
See image(6) for the full range of channel descriptors.
For example, k8 gives 8 bit greyscale, and x8r8g8b8
gives 24 bit colour on a PC. The set of channels sup-
ported is platform-dependent.
-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
/dev/pointer as described in cons(3).
-v Print version data: edition and revision date.
Options may also be set in the host operating system's envi-
ronment variable EMU; they are overridden by options sup-
plied on the command line.
Page 2 Plan 9 (printed 11/17/24)
EMU(1E) EMU(1E)
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 INFERNO;
or the value of the environment variable ROOT; or the value
of a -r option in the environment variable EMU; or the
rootpath set by a -r option to the emu command itself.
Emu sets several Inferno environment variables:
cputype host processor architecture: 386 (for any x86),
arm, mips, power (any Power or PowerPC), sparc,
and spim (little-endian MIPS).
emuargs arguments with which emu was invoked
emuhost host operating system type, such as: FreeBSD,
Irix, Linux, MacOSX, NetBSD, Nt (used for Win-
dows generally), OpenBSD, Plan9, Solaris and
Unixware.
emuroot name of directory in host file system that acts
as Inferno's root directory
emuwdir name in host file system of directory where emu
was invoked
EXAMPLE
To start wm/logon directly:
EMU='-g800x600 -c1'
emu /dis/wm/wm.dis wm/logon -u inferno
FILES
/dis/emuinit.dis The default initialisation program.
/dis/sh.dis The default Inferno shell.
SOURCE
/emu
SEE ALSO
limbo(1), wm-misc(1)
Page 3 Plan 9 (printed 11/17/24)