Manual page for read(9E)
read - read data from a device
SYNOPSIS
#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);
INTERFACE LEVEL
Architecture independent level 1 (DDI/DKI).
This entry point is
optional.
ARGUMENTS
- 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.
DESCRIPTION
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.
RETURN VALUES
The
read()
routine should return
0
for success,
or the appropriate error number.
SEE ALSO
read.2
write.9e
cb_ops.9s
uio.9s
Created by unroff & hp-tools.
© by Hans-Peter Bischof. All Rights Reserved (1997).
Last modified 21/April/97
