V8/usr/man/man9/jioctl.9

.TH JIOCTL 9.4
.SH NAME
jioctl \- jerq ioctl requests
.SH SYNOPSIS
.B #include "/usr/jerq/include/jioctl.h"
.PP
.B ioctl(fd,
.SM
.B JMUX,
.B 0)
.PP
.B ioctl(fd, request, win)
.br
struct winsize *win;
.SH DESCRIPTION
.IR Mux (9.1)
supports several jerq-specific
.IR ioctl (2)
requests for Unix programs attached to layers.
The requests are:
.TP \w'JBOOT   'u
JMUX
returns 0 if file descriptor
.I fd
is connected to a
.I mux
layer, \-1 otherwise.
.TP
JTERM
resets the layer connected to
.I fd
to the default terminal program.
.TP
JBOOT
initiates the down-load protocol to replace the layer's terminal program.
Usually called by
.IR 32ld (9.1).
.TP
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
JWINSIZE
returns, in the location pointed to by the third argument,
a structure describing the size of the layer connected to
.IR fd .
The structure is:
.nf
.IP
.ta 7n +7n +\w'bytesx, bytesy;  'u"
struct winsize {
	char	bytesx, bytesy;	/* size in characters */
	short	bitsx, bitsy;	/* size in pixels */
};
.fi
.TP
JEXIT
causes
.I mux
to exit.
.SH SEE ALSO
32ld(9.1), mux(9.1), ioctl(2)