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man pages section 9: DDI and DKI Kernel Functions

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Updated: Thursday, June 13, 2019
 
 

ldi_write(9F)

Name

ldi_read, ldi_write - Read and write from a device

Synopsis

#include <sys/sunldi.h>

int ldi_read(ldi_handle_t lh, struct uio *uiop, cred_t *cr);
int  ldi_write(ldi_handle_t lh, struct uio *uiop, cred_t *cr);

Parameters

lh

Layered handle.

cr

Pointer to a credential structure used to open a device.

uiop

Pointer to the uio(9S) structure. uio(9S) specifies the location of the read or write data. (Either userland or kernel.)

Description

The ldi_read () function passes a read request to the device entry point for the device specified by the layered handle. This operation is supported for block, character, and streams devices.

The ldi_write() function passes a write request to the device entry point for a device specified by the layered handle. This operation is supported for block, character, and streams devices.

Return Values

The ldi_read() and ldi_write() functions return 0 upon success. If a failure occurs before the request is passed to the device, the possible return values are shown below. Otherwise any other error number may be returned by the device.

EINVAL

Invalid input parameters.

ENOTSUP

Operation is not supported for this device.

Context

These functions may be called from user or kernel context.