xx.c Files

A .c file for a device driver contains the data declarations and the code for the entry points of the driver. It contains the #include statements the driver needs, declares extern references, declares local data, sets up the cb_ops and dev_ops structures, declares and initializes the module configuration section, makes any other necessary declarations, and defines the driver entry points. The following sections describe these driver components. Example E-3 shows the layout of an xx.c file.

Example E-3 xx.c File

/* xx.c */
#include "xximpl.h"
#include "xxio.h"
#include <sys/ddi.h>							/* must include these two files */
#include <sys/sunddi.h>							/* and they must be the last system */
							/* includes */
/* forward declaration of entry points */

/* static declarations of cb_ops entry point functions...*/

static struct cb_ops xx_cb_ops = {
	/* set cb_ops fields */
};

/* static declarations of dev_ops entry point functions */
static struct dev_ops xx_ops = {
	/* set dev_ops fields*/
};

/* declare and initialize the module configuration section */
static struct modldrv modldrv = {
	/* set modldrv fields */
};
static struct modlinkage modlinkage = {
	/* set modlinkage fields */
};
int
_init(void)
{
	/* definition */
}
int
_info(struct modinfo *modinfop)
{
	/* definition */
}
int
_fini(void)
{
	/* definition */
}
static int
xxprobe(dev_info_t *dip)
{
	/* definition */
}
static int
xxattach(dev_info_t *dip, ddi_attach_cmd_t cmd)
{
	/* definition */
}
static int
xxdetach(dev_info_t *dip, ddi_detach_cmd_t cmd)
{
	/* definition */
}
static int
xxgetinfo(dev_info_t *dip, ddi_info_cmd_t cmd, void *arg,
   void **result)
{
	/* definition */
}
static int
xxopen(dev_t *devp, int flag, int otyp, cred_t *credp)
{
	/* definition */
}
static int
xxclose(dev_t dev, int flag, int otyp, cred_t *credp)
{
	/* definition */
}
static int
xxstrategy(struct buf *bp)
{
	/* definition */
}

/* for character-oriented devices */
static int
xxread(dev_t dev, struct uio *uiop, cred_t *credp)
{
	/* definition */
}
/* for asynchronous I/O */
static int
xxaread(dev_t dev, struct aio_req *aiop, cred_t *cred_p)
{
	/* definition */
}
static int
xxwrite(dev_t dev, struct uio *uiop, cred_t *credp)
{
	/* definition */
}

/* for asynchronous I/O */
static int
xxawrite(dev_t dev, struct aio_req *aiop, cred_t *cred_p)
{
	/* definition */
}
static int
xxioctl(dev_t dev, int cmd, intptr_t arg, int mode, cred_t
*credp,
    int *rvalp)
{
	/* definition */
}

/* for memory-mapped character-oriented devices */
static int
xxdevmap(dev_t dev, devmap_cookie_t dhp, offset_t off, size_t
len, size_t *maplen, uint_t model)
{
	/* definition */
}

/* for support of the poll(2) system call */
static int
xxchpoll(dev_t dev, short events, int anyyet, short *reventsp,
    struct pollhead **phpp)
{
	/* definition */
}

/* for drivers needing a xxprop_op routine */
static int
xxprop_op(dev_t dev, dev_info_t *dip, ddi_prop_op_t prop_op,
    int mod_flags, char *name, caddr_t valuep, int *lengthp)
{
	/* definition */
}