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Deviceslp(7D)


NAME

 lp - driver for parallel port

SYNOPSIS

 
include <sys/bpp_io.h> 
fd = open("/dev/lpn", flags);

DESCRIPTION

 

The lp driver provides the interface to the parallel ports used by printers for IA based systems. The lp driver is implemented as a STREAMS device.

IOCTLS

 
BPPIOC_TESTIO
Test transfer readiness. This command checks to see if a read or write transfer would succeed based on pin status. If a transfer would succeed, 0 is returned. If a transfer would fail, -1 is returned, and errno is set to EIO. The error status can be retrieved using the BPPIOC_GETERR ioctl() call.
BPPIOC_GETERR
Get last error status. The argument is a pointer to a struct bpp_error_status. See below for a description of the elements of this structure. This structure indicates the status of all the appropriate status bits at the time of the most recent error condition during a read(2) or write(2) call, or the status of the bits at the most recent BPPIOC_TESTIO ioctl(2) call. The application can check transfer readiness without attempting another transfer using the BPPIOC_TESTIO ioctl().

Error Pins Structure

 

This structure and symbols are defined in the include file <sys/bpp_io.h>:

 
struct bpp_error_status {
	   char  timeout_occurred;   /* Not use */
   	char  bus_error;          /* Not use */
   	uchar_t pin_status;       /* Status of pins which could cause an error */
};

/* Values for pin_status field */
#define BPP_ERR_ERR 0x01   /* Error pin active */
#define BPP_SLCT_ERR 0x02  /* Select pin active */
#define BPP_PE_ERR 0x04    /* Paper empty pin active */

Note: Other pin statuses are defined in <sys/bpp_io.h>, but BPP_ERR_ERR, BPP_SLCT_ERR and BPP_PE_ERR are the only ones valid for the IA lp driver.

ERRORS

 
EIO
A BPPIOC_TESTIO ioctl() call is attempted while a condition exists that would prevent a transfer (such as a peripheral error).
EINVAL
An ioctl() is attempted with an invalid value in the command argument.

FILES

 
/platform/i86pc/kernel/drv/lp.conf
configuration file for lp driver

ATTRIBUTES

 

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPEATTRIBUTE VALUE
ArchitectureIA

SEE ALSO

 

sysbus(4), attributes(5), streamio(7I)

NOTES

 

A read operation on a bi-directional parallel port is not supported.


SunOS 5.9Go To TopLast Changed 21 May 1997

 
      
      
Copyright 2002 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.