8½(4) 8½(4) NAME 8½ - window system files SYNOPSIS 8½ [ -i 'cmd' ] [ -s ] [ -f font ] The window system 8½ serves a variety of files for reading, writing, and controlling windows. Some of them are virtual versions of system files for dealing with the display, key- board, and mouse; others control operations of the window system itself. 8½ posts its service in the /srv directory, using a name constructed from a catenation of the user ID and a process id; the environment variable $8½srv is set to this service name within processes running under the control of each invocation of 8½. A mount (see bind(1)) of that file causes 8½ to create a new window; the attach specifier in the mount gives the coordi- nates of the created window. The syntax of the specifier is N pid minx miny maxx maxy where pid is the process id of a process in the note group (see fork(2)) to receive interrupt and hangup notes in that window. When a window is created either by the window command (see 8½(1)) or by using the menu supplied by 8½, this server is mounted on /mnt/8½ and also /dev; the files mentioned here appear in both those directories. Some of these files supply virtual versions of services available from the underlying environment, in particular the character terminal files cons(3), and all the bit devices bit(3), each specific to the window. Other files are unique to 8½. bitblt is a virtual version of the bitblt file within the cur- rent window; see bit(3), graphics(2). All operations are clipped to the current window. The coordinate sys- tem is absolute; it refers to the real screen. cons is a virtual version of the standard terminal file cons(3). 8½ supplies extra editing features and a scroll bar (see 8½(1)). consctl controls interpretation of keyboard input. Writing strings on it sets these modes: rawon turns on raw 8½(4) 8½(4) mode; rawoff turns off raw mode; holdon turns on hold mode; holdoff turns off hold mode. Closing the file makes the window revert to default state (raw off, hold off). label initially contains a string with the process ID of the lead process in the window and the command being exe- cuted there. It may be written and is used as a tag when the window is hidden. mouse is a virtual version of the standard mouse file (see bit(3)). Opening it turns off scrolling, editing, and 8½-supplied menus in the associated window. The 0x80 bit in the buttons byte of a returned record indicates that the window has been reshaped. Reading this file blocks until the mouse moves or a button changes. Mouse movements or button changes are invisible when the mouse cursor is located outside the window. nbmouse is a non-blocking version of mouse; it always returns the current state. Its use is discouraged. select returns the selected text in the designated window. It may not be written. snarf returns the string currently in the snarf buffer. It may not be written. winid returns the unique and unchangeable ID for the window; it is a string of digits. window is the virtual version of /dev/screen; see bit(3). It contains the depth, coordinates, and bitmap correspond- ing to the associated window. windows is a directory containing a subdirectory for each win- dow, named by the unique ID for that window. Within each subdirectory are entries corresponding to several of the special files associated with that window: bitblt, cons, consctl, label, mouse, nbmouse, select, window. EXAMPLES Create a window to be created in the upper left corner, and 8½(4) 8½(4) the word `hi' to be printed there. mount $8½srv /tmp N$pid' 0 0 128 64' echo hi > /tmp/cons Prints the text currently selected in window 123. cat /dev/windows/123/select SEE ALSO 8½(1), bit(3), cons(3), event(2), graphics(2).