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 user‐
land 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 sup‐
ported 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.
SunOS 5.10 3 June 2003 ldi_read(9F)
