cb_ops - character/block entry points structure
#include <sys/conf.h> #include <sys/ddi.h> #include <sys/sunddi.h>
Solaris DDI specific (Solaris DDI)
The cb_ops structure contains all entry points for drivers that support both character and block entry points. All leaf device drivers that support direct user process access to a device should declare a cb_ops structure.
All drivers that safely allow multiple threads of execution in the driver at the same time must set the D_MP flag in the cb_flag field. See open(9E).
If the driver properly handles 64-bit offsets, it should also set the D_64BIT flag in the cb_flag field. This specifies that the driver will use the uio_loffset field of the uio(9S) structure.
If the driver returns EINTR from open(9E), it should also set the D_OPEN_RETURNS_EINTR flag in the cb_flag field. This lets the framework know that it is safe for the driver to return EINTR when waiting, to provide exclusion for a last-reference close(9E) call to complete before calling open(9E).
The mt-streams(9F) function describes other flags that can be set in the cb_flag field.
The cb_rev is the cb_ops structure revision number. This field must be set to CB_REV.
Non-STREAMS drivers should set cb_str to NULL.
The following DDI/DKI or DKI-only or DDI-only functions are provided in the character/block driver operations structure.
int (*cb_open)(dev_t *devp, int flag, int otyp, cred_t *credp); int (*cb_close)(dev_t dev, int flag, int otyp, cred_t *credp); int (*cb_strategy)(struct buf *bp); int (*cb_print)(dev_t dev, char *str); int (*cb_dump)(dev_t dev, caddr_t addr, daddr_t blkno, int nblk); int (*cb_read)(dev_t dev, struct uio *uiop, cred_t *credp); int (*cb_write)(dev_t dev, struct uio *uiop, cred_t *credp); int (*cb_ioctl)(dev_t dev, int cmd, intptr_t arg, int mode, cred_t *credp, int *rvalp); int (*cb_devmap)(dev_t dev, devmap_cookie_t dhp, offset_t off, size_t len, size_t *maplen, uint_t model); int (*cb_mmap)(dev_t dev, off_t off, int prot); int (*cb_segmap)(dev_t dev, off_t off, struct as *asp, caddr_t *addrp, off_t len, unsigned int prot, unsigned int maxprot, unsigned int flags, cred_t *credp); int (*cb_chpoll)(dev_t dev, short events, int anyyet, short *reventsp, struct pollhead **phpp); int (*cb_prop_op)(dev_t dev, dev_info_t *dip, ddi_prop_op_t prop_op, int mod_flags, char *name, caddr_t valuep, int *length); struct streamtab *cb_str; /* streams information */ int cb_flag; int cb_rev; int (*cb_aread)(dev_t dev, struct aio_req *aio, cred_t *credp); int (*cb_awrite)(dev_t dev, struct aio_req *aio, cred_t *credp);
aread(9E), awrite(9E), chpoll(9E), close(9E), dump(9E), ioctl(9E), mmap(9E), open(9E), print(9E), prop_op(9E), read(9E), segmap(9E), strategy(9E), write(9E), nochpoll(9F), nodev(9F), nulldev(9F), dev_ops(9S), qinit(9S)
STREAMS Programming Guide