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prnio(4i)
Ioctls for a class of drivers or subsystems prnio(4I)
NAME
prnio - generic printer interface
SYNOPSIS
#include <sys/prnio.h>
DESCRIPTION
The prnio generic printer interface defines ioctl commands and data
structures for printer device drivers.
prnio defines and provides facilities for five basic phases of the
printing process:
o Identification — Retrieve device information/attributes
o Setup — Set device attributes
o Transfer — Transfer data to or from the device
o Cleanup — Transfer phase conclusion
o Abort — Transfer phase interruption
During the Identification phase, the application retrieves a set of
device capabilities and additional information using the
PRNIOC_GET_IFCAP, PRNIOC_GET_STATUS, PRNIOC_GET_TIMEOUTS,
PRNIOC_GET_IFINFO and PRNIOC_GET_1284_DEVID commands.
During the Setup phase the application sets some interface attributes
and probably resets the printer as described in the PRNIOC_SET_IFCAP,
PRNIOC_SET_TIMEOUTS and PRNIOC_RESET sections.
During the Transfer phase, data is transferred in a forward (host to
peripheral) or reverse direction (peripheral to host). Transfer is
accomplished using write(2) and read(2) system calls. For prnio compli‐
ant printer drivers, forward transfer support is mandatory, while
reverse transfer support is optional. Applications can also use
PRNIOC_GET_STATUS and PRNIOC_GET_1284_STATUS commands during the trans‐
fer to monitor the device state.
The Cleanup phase is accomplished by closing the device using close(2).
Device drivers supporting prnio may set non-zero error code as appro‐
priate. Applications should explicitly close(2) a device before exiting
and check errno value.
The Abort phase is accomplished by interrupting the write(2) and
read(2) system calls. The application can perform some additional
cleanup during the Abort phase as described in PRNIOC_GET_IFCAP sec‐
tion.
IOCTLS
PRNIOC_GET_IFCAP Application can retrieve printer interface capa‐
bilities using this command. The ioctl(2) argument
is a pointer to uint_t, a bit field representing a
set of properties and services provided by a
printer driver. Set bit means supported capabil‐
ity. The following values are defined:
PRN_BIDI - When this bit is set, the interface
operates in a bidirectional mode, instead of
forward-only mode.
PRN_HOTPLUG - If this bit is set, the interface
allows device hot-plugging.
PRN_1284_DEVID - If this bit is set, the device
is capable of returning 1284 device ID (see
PRNIOC_GET_1284_DEVID.)
PRN_1284_STATUS - If this bit is set, the device
driver can return device status lines (see
PRNIOC_GET_1284_STATUS). Some devices support
this ioctl in unidirectional mode only.
PRN_TIMEOUTS - If this bit is set the peripheral
may stall during the transfer phase and the
driver can timeout and return from the write(2)
and read(2) returning the number of bytes that
have been transferred. If PRN_TIMEOUTS is set,
the driver supports this functionality and the
timeout values can be retrieved and modified via
the PRNIOC_GET_TIMEOUTS and PRNIOC_SET_TIMEOUTS
ioctls. Otherwise, applications can implement
their own timeouts and abort phase.
PRN_STREAMS - This bit impacts the application
abort phase behaviour. If the device claimed
PRN_STREAMS capability, the application must
issue an I_FLUSH ioctl(2) before close(2) to
dismiss the untransferred data. Only STREAMS
drivers can support this capability.
PRNIOC_SET_IFCAP This ioctl can be used to change interface capa‐
bilities. The argument is a pointer to uint_t bit
field that is described in detail in the
PRNIOC_GET_IFCAP section. Capabilities should be
set one at a time; otherwise the command will
return EINVAL. The following capabilities can be
changed by this ioctl:
PRN_BIDI - When this capability is set, the
interface operates in a bidirectional mode,
instead of forward-only mode. Devices that sup‐
port only one mode will not return error; appli‐
cations should use PRNIOC_GET_IFCAP to check if
the mode was successfully changed. Because some
capabilities may be altered as a side effect of
changing other capabilities, this command should
be followed by PRNIOC_GET_IFCAP.
PRNIOC_GET_IFINFO This command can be used to retrieve printer
interface info string, which is an arbitrary for‐
mat string usually describing the bus type. The
argument is a pointer to struct prn_interface_info
as described below.
struct prn_interface_info {
uint_t if_len; /* length of buffer */
uint_t if_rlen; /* actual info length */
char *if_data; /* buffer address */
};
The application allocates a buffer and sets if_data and if_len values
to its address and length, respectively. The driver returns the string
to this buffer and sets if_len to its length. If if_len is less that
if_rlen, the driver must return the first if_len bytes of the string.
The application may then repeat the command with a bigger buffer.
Although prnio does not limit the contents of the interface info
string, some values are recommended and defined in <sys/prnio.h> by the
following macros:
PRN_PARALLEL - Centronics or IEEE 1284 compatible devices
PRN_SERIAL - EIA-232/EIA-485 serial ports
PRN_USB - Universal Serial Bus printers
PRN_1394 - IEEE 1394 peripherals
Printer interface info string is for information only: no implica‐
tions should be made from its value.
PRNIOC_RESET Some applications may want to reset the
printer state during Setup and/or Cleanup
phase using PRNIOC_RESET command. Reset seman‐
tics are device-specific, and in general,
applications using this command should be
aware of the printer type.
Each prnio compliant driver is required to
accept this request, although performed
actions are completely driver-dependent. More
information on the PRNIOC_RESET implementation
for the particular driver is available in the
corresponding man page and printer manual.
PRNIOC_GET_1284_DEVID This command can be used to retrieve printer
device ID as defined by IEEE 1284-1994. The
ioctl(2) argument is a pointer to struct
prn_1284_device_id as described below.
struct prn_1284_device_id {
uint_t id_len; /* length of buffer */
uint_t id_rlen; /* actual ID length */
char *id_data; /* buffer address */
};
For convenience, the two-byte length field is not considered part of
device ID string and is not returned in the user buffer. Instead,
id_rlen value shall be set to (length - 2) by the driver, where length
is the ID length field value. If buffer length is less than id_rlen,
the driver returns the first id_len bytes of the ID.
The printer driver must return the most up-to-date value of the device
ID.
PRNIOC_GET_STATUS This command can be used by applications to
retrieve current device status. The argument is a
pointer to uint_t, where the status word is
returned. Status is a combination of the following
bits:
PRN_ONLINE - For devices that support PRN_HOTPLUG capability,
this bit is set when the device is online, otherwise the
device is offline. Devices without PRN_HOTPLUG support should always
have this bit set.
PRN_READY - This bit indicates if the device is ready to receive/send
data. Applications may use this bit for an outbound flow control
PRNIOC_GET_1284_STATUS Devices that support PRN_1284_STATUS capabil‐
ity accept this ioctl to retrieve the device
status lines defined in IEEE 1284 for use in
Compatibility mode. The following bits may be
set by the driver:
PRN_1284_NOFAULT - Device is not in error
state
PRN_1284_SELECT - Device is selected
PRN_1284_PE - Paper error
PRN_1284_BUSY - Device is busy
PRNIOC_GET_TIMEOUTS This command retrieves current transfer time‐
out values for the driver. The argument is a
pointer to struct prn_timeouts as described
below.
struct prn_timeouts {
uint_t tmo_forward; /* forward transfer timeout */
uint_t tmo_reverse; /* reverse transfer timeout */
};
tmo_forward and tmo_reverse define forward and reverse transfer time‐
outs in seconds. This command is only valid for drivers that support
PRN_TIMEOUTS capability.
PRNIOC_SET_TIMEOUTS This command sets current transfer timeout val‐
ues for the driver. The argument is a pointer to
struct prn_timeouts. See PRNIOC_GET_TIMEOUTS for
description of this structure. This command is
only valid for drivers that support PRN_TIMEOUTS
capability.
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
TRIBUTE VALUE _ ArchitectureSPARC, IA _ Interface StabilityCommitted
SEE ALSO
close(2), ioctl(2), read(2), write(2), ecpp(4D), usbprn(4D),
attributes(7)
IEEE Std 1284-1994
Oracle Solaris 11.4 27 Nov 2017 prnio(4I)