V10/man/man9/jioctl.9

.TH JIOCTL 9.4
.CT 2 comm_term
.SH NAME
jioctl \- mux ioctl requests
.SH SYNOPSIS
.B
#include "/usr/jerq/include/jioctl.h"
.\" not <jioctl.h>: /usr/jerq/include is not in the cc include path 
.PP
.B ioctl(fd, request, 0)
.PP
.B ioctl(fd, JWINSIZE, win)
.br
.B struct winsize *win;
.SH DESCRIPTION
.IR Mux (9.1)
supports several 
.IR ioctl (2)
requests for Unix programs attached to layers.
The requests are:
.TF JBOOT
.TP
.B JMUX
returns 0 if file descriptor
.I fd
is connected to a
.I mux
layer, \-1 otherwise.
.PD
.TP
.B JTERM
resets the layer connected to
.I fd
to the default terminal program.
.TP
.B JBOOT
initiates the down-load protocol to replace the layer's terminal program.
Usually called by
.IR 32ld (9.1).
.TP
.B JZOMBOOT
is the same as
.IR JBOOT ,
but disables execution of the program when the download is complete
(see the
.B -z
flag of
.IR 32ld ).
.TP
.B JWINSIZE
returns, in the location pointed to by the third argument,
a structure describing the size of the layer connected to
.IR fd ,
with character 
.L 0
being the unit of size.
The structure is:
.IP
.EX
.ta 7n +7n +\w'bytesx, bytesy;  'u"
struct winsize {
	char	bytesx, bytesy;	/* size in characters */
	short	bitsx, bitsy;	/* size in pixels */
};
.EE
.TP
.B JEXIT
causes
.I mux
to exit.
.SH SEE ALSO
.IR 32ld (9.1), 
.IR mux (9.1), 
.IR ioctl (2)