lp(7D) (man pages section 7: Device and Network Interfaces)

man pages section 7: Device and Network Interfaces

lp(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 TYPE	ATTRIBUTE VALUE
Architecture	IA

NOTES

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

SunOS 5.9 Last Revised 21 May 1997