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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().

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 */