1ldi_read(9F)             Kernel Functions for Drivers             ldi_read(9F)
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NAME

6       ldi_read, ldi_write - Read and write from a device
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SYNOPSIS

9       #include <sys/sunldi.h>
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11       int ldi_read(ldi_handle_t lh, struct uio *uiop, cred_t *cr);
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14       int  ldi_write(ldi_handle_t lh, struct uio *uiop, cred_t *cr);
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PARAMETERS

18       lh       Layered handle.
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21       cr       Pointer to a credential structure used to open a device.
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24       uiop     Pointer to the uio(9S) structure. uio(9S) specifies  the loca‐
25                tion of the read or write data.  (Either userland or kernel.)
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DESCRIPTION

29       The ldi_read() function passes a read request to the device entry point
30       for  the device specified by the layered handle. This operation is sup‐
31       ported  for  block,  character, and streams devices.
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34       The ldi_write() function passes a write request  to  the  device  entry
35       point  for  a device specified by the layered handle. This operation is
36       supported for block,  character, and streams devices.
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RETURN VALUES

39       The ldi_read() and ldi_write() functions return 0 upon success.  If   a
40       failure occurs before the request is passed to the device, the possible
41       return values are shown below. Otherwise any other error number may  be
42       returned by the device.
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44       EINVAL     Invalid input parameters.
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47       ENOTSUP    Operation is not supported for this device.
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CONTEXT

51       These functions may be called from user or kernel context.
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55SunOS 5.11                        3 June 2003                     ldi_read(9F)