READ(9E) Driver Entry Points READ(9E)

read - read data from a device

#include <sys/types.h>
#include <sys/errno.h>
#include <sys/open.h>
#include <sys/uio.h>
#include <sys/cred.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>
int prefixread(dev_t dev, struct uio *uio_p, cred_t *cred_p);

Architecture independent level 1 (DDI/DKI). This entry point is optional.

dev

Device number.

uio_p

Pointer to the uio(9S) structure that describes where the data is to be stored in user space.

cred_p

Pointer to the user credential structure for the I/O transaction.

The driver read() routine is called indirectly through cb_ops(9S) by the read(2) system call. The read() routine should check the validity of the minor number component of dev and the user credential structure pointed to by cred_p (if pertinent). The read() routine should supervise the data transfer into the user space described by the uio(9S) structure.

The read() routine should return 0 for success, or the appropriate error number.

Example 1 read() routine using physio()

The following is an example of a read() routine using physio(9F) to perform reads from a non-seekable device:



static int
xxread(dev_t dev, struct uio *uiop, cred_t *credp)
{
int rval;
offset_t off;
int instance;
xx_t xx;
instance = getminor(dev);
xx = ddi_get_soft_state(xxstate, instance);
if (xx == NULL)
return (ENXIO);
off = uiop->uio_loffset;
rval = physio(xxstrategy, NULL, dev, B_READ,
xxmin, uiop);
uiop->uio_loffset = off;
return (rval);
}

read(2), write(9E), physio(9F), cb_ops(9S), uio(9S)

Writing Device Drivers

November 19, 1997 OmniOS