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| lp - driver for parallel port |
SYNOPSIS
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include <sys/bpp_io.h>
fd = open("/dev/lpn", flags);
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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.
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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.
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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
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This structure and symbols are defined in the include file <sys/bpp_io.h>:
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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 */
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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.
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EIO
- A BPPIOC_TESTIO ioctl() call
is attempted while a condition exists that would prevent a transfer (such as a peripheral error).
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EINVAL
- An ioctl() is attempted with an invalid value in the command argument.
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/platform/i86pc/kernel/drv/lp.conf
- configuration file for lp driver
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See attributes(5) for descriptions of the following
attributes:
ATTRIBUTE TYPE | ATTRIBUTE VALUE |
Architecture | IA |
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A read operation on a bi-directional parallel port is not supported.
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