ldi_read(9F)
Name
ldi_read, ldi_write - Read and write from a deviceSynopsis
#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.