Quote Of The Day Version 2 Source
Enter the source code shown in the following example into a text file named qotd_2.c.
Example 3–3 Quote Of The Day Version 2 Source File
#include <sys/types.h>
#include <sys/file.h>
#include <sys/errno.h>
#include <sys/open.h>
#include <sys/cred.h>
#include <sys/uio.h>
#include <sys/stat.h>
#include <sys/modctl.h>
#include <sys/conf.h>
#include <sys/devops.h>
#include <sys/debug.h>
#include <sys/cmn_err.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>
#define QOTD_NAME "qotd"
#define QOTD_MAXLEN 128
static const char qotd[QOTD_MAXLEN]
= "You can't have everything. \
Where would you put it? - Steven Wright\n";
static void *qotd_state_head;
struct qotd_state {
int instance;
dev_info_t *devi;
};
static int qotd_getinfo(dev_info_t *, ddi_info_cmd_t, void *, void **);
static int qotd_attach(dev_info_t *, ddi_attach_cmd_t);
static int qotd_detach(dev_info_t *, ddi_detach_cmd_t);
static int qotd_open(dev_t *, int, int, cred_t *);
static int qotd_close(dev_t, int, int, cred_t *);
static int qotd_read(dev_t, struct uio *, cred_t *);
static struct cb_ops qotd_cb_ops = {
qotd_open, /* cb_open */
qotd_close, /* cb_close */
nodev, /* cb_strategy */
nodev, /* cb_print */
nodev, /* cb_dump */
qotd_read, /* cb_read */
nodev, /* cb_write */
nodev, /* cb_ioctl */
nodev, /* cb_devmap */
nodev, /* cb_mmap */
nodev, /* cb_segmap */
nochpoll, /* cb_chpoll */
ddi_prop_op, /* cb_prop_op */
(struct streamtab *)NULL, /* cb_str */
D_MP | D_64BIT, /* cb_flag */
CB_REV, /* cb_rev */
nodev, /* cb_aread */
nodev /* cb_awrite */
};
static struct dev_ops qotd_dev_ops = {
DEVO_REV, /* devo_rev */
0, /* devo_refcnt */
qotd_getinfo, /* devo_getinfo */
nulldev, /* devo_identify */
nulldev, /* devo_probe */
qotd_attach, /* devo_attach */
qotd_detach, /* devo_detach */
nodev, /* devo_reset */
&qotd_cb_ops, /* devo_cb_ops */
(struct bus_ops *)NULL, /* devo_bus_ops */
nulldev /* devo_power */
};
static struct modldrv modldrv = {
&mod_driverops,
"Quote of the Day 2.0",
&qotd_dev_ops};
static struct modlinkage modlinkage = {
MODREV_1,
(void *)&modldrv,
NULL
};
int
_init(void)
{
int retval;
if ((retval = ddi_soft_state_init(&qotd_state_head,
sizeof (struct qotd_state), 1)) != 0)
return retval;
if ((retval = mod_install(&modlinkage)) != 0) {
ddi_soft_state_fini(&qotd_state_head);
return (retval);
}
return (retval);
}
int
_info(struct modinfo *modinfop)
{
return (mod_info(&modlinkage, modinfop));
}
int
_fini(void)
{
int retval;
if ((retval = mod_remove(&modlinkage)) != 0)
return (retval);
ddi_soft_state_fini(&qotd_state_head);
return (retval);
}
/*ARGSUSED*/
static int
qotd_getinfo(dev_info_t *dip, ddi_info_cmd_t cmd, void *arg, void **resultp)
{
struct qotd_state *qsp;
int retval = DDI_FAILURE;
ASSERT(resultp != NULL);
switch (cmd) {
case DDI_INFO_DEVT2DEVINFO:
if ((qsp = ddi_get_soft_state(qotd_state_head,
getminor((dev_t)arg))) != NULL) {
*resultp = qsp->devi;
retval = DDI_SUCCESS;
} else
*resultp = NULL;
break;
case DDI_INFO_DEVT2INSTANCE:
*resultp = (void *)getminor((dev_t)arg);
retval = DDI_SUCCESS;
break;
}
return (retval);
}
static int
qotd_attach(dev_info_t *dip, ddi_attach_cmd_t cmd)
{
int instance = ddi_get_instance(dip);
struct qotd_state *qsp;
switch (cmd) {
case DDI_ATTACH:
if (ddi_soft_state_zalloc(qotd_state_head, instance)
!= DDI_SUCCESS) {
cmn_err(CE_WARN, "Unable to allocate state for %d",
instance);
return (DDI_FAILURE);
}
if ((qsp = ddi_get_soft_state(qotd_state_head, instance))
== NULL) {
cmn_err(CE_WARN, "Unable to obtain state for %d",
instance);
ddi_soft_state_free(dip, instance);
return (DDI_FAILURE);
}
if (ddi_create_minor_node(dip, QOTD_NAME, S_IFCHR, instance,
DDI_PSEUDO, 0) != DDI_SUCCESS) {
cmn_err(CE_WARN, "Cannot create minor node for %d",
instance);
ddi_soft_state_free(dip, instance);
ddi_remove_minor_node(dip, NULL);
return (DDI_FAILURE);
}
qsp->instance = instance;
qsp->devi = dip;
ddi_report_dev(dip);
return (DDI_SUCCESS);
case DDI_RESUME:
return (DDI_SUCCESS);
default:
return (DDI_FAILURE);
}
}
static int
qotd_detach(dev_info_t *dip, ddi_detach_cmd_t cmd)
{
int instance = ddi_get_instance(dip);
switch (cmd) {
case DDI_DETACH:
ddi_soft_state_free(qotd_state_head, instance);
ddi_remove_minor_node(dip, NULL);
return (DDI_SUCCESS);
case DDI_SUSPEND:
return (DDI_SUCCESS);
default:
return (DDI_FAILURE);
}
}
/*ARGSUSED*/
static int
qotd_open(dev_t *devp, int flag, int otyp, cred_t *credp)
{
int instance = getminor(*devp);
struct qotd_state *qsp;
if ((qsp = ddi_get_soft_state(qotd_state_head, instance)) == NULL)
return (ENXIO);
ASSERT(qsp->instance == instance);
if (otyp != OTYP_CHR)
return (EINVAL);
return (0);
}
/*ARGSUSED*/
static int
qotd_close(dev_t dev, int flag, int otyp, cred_t *credp)
{
struct qotd_state *qsp;
int instance = getminor(dev);
if ((qsp = ddi_get_soft_state(qotd_state_head, instance)) == NULL)
return (ENXIO);
ASSERT(qsp->instance == instance);
if (otyp != OTYP_CHR)
return (EINVAL);
return (0);
}
/*ARGSUSED*/
static int
qotd_read(dev_t dev, struct uio *uiop, cred_t *credp)
{
struct qotd_state *qsp;
int instance = getminor(dev);
if ((qsp = ddi_get_soft_state(qotd_state_head, instance)) == NULL)
return (ENXIO);
ASSERT(qsp->instance == instance);
return (uiomove((void *)qotd, min(uiop->uio_resid, strlen(qotd)),
UIO_READ, uiop));
}
Enter the configuration information shown in the following example into a text file named qotd_2.conf.
Example 3–4 Quote Of The Day Version 2 Configuration File
name="qotd_2" parent="pseudo" instance=0;
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