opensolaris man page for ldi_read

ldi_read(9F)						   Kernel Functions for Drivers 					      ldi_read(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 pos-
       sible 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.

SunOS 5.11							    3 June 2003 						      ldi_read(9F)