diff options
Diffstat (limited to 'sys/kern/kern_conf.c')
| -rw-r--r-- | sys/kern/kern_conf.c | 89 |
1 files changed, 75 insertions, 14 deletions
diff --git a/sys/kern/kern_conf.c b/sys/kern/kern_conf.c index 56eaf11..d578077 100644 --- a/sys/kern/kern_conf.c +++ b/sys/kern/kern_conf.c @@ -39,6 +39,7 @@ __FBSDID("$FreeBSD$"); #include <sys/conf.h> #include <sys/vnode.h> #include <sys/queue.h> +#include <sys/poll.h> #include <sys/ctype.h> #include <machine/stdarg.h> @@ -68,7 +69,19 @@ static int ready_for_devs; static int free_devt; SYSCTL_INT(_debug, OID_AUTO, free_devt, CTLFLAG_RW, &free_devt, 0, ""); -/* Define a dead_cdevsw for use when devices leave unexpectedly. */ +int +nullop(void) +{ + + return (0); +} + +int +eopnotsupp(void) +{ + + return (EOPNOTSUPP); +} static int enxio(void) @@ -76,13 +89,21 @@ enxio(void) return (ENXIO); } +static int +enodev(void) +{ + return (ENODEV); +} + +/* Define a dead_cdevsw for use when devices leave unexpectedly. */ + #define dead_open (d_open_t *)enxio #define dead_close (d_close_t *)enxio #define dead_read (d_read_t *)enxio #define dead_write (d_write_t *)enxio #define dead_ioctl (d_ioctl_t *)enxio -#define dead_poll nopoll -#define dead_mmap nommap +#define dead_poll (d_poll_t *)enodev +#define dead_mmap (d_mmap_t *)enodev static void dead_strategy(struct bio *bp) @@ -92,7 +113,6 @@ dead_strategy(struct bio *bp) } #define dead_dump (dumper_t *)enxio - #define dead_kqfilter (d_kqfilter_t *)enxio static struct cdevsw dead_cdevsw = { @@ -110,6 +130,47 @@ static struct cdevsw dead_cdevsw = { .d_kqfilter = dead_kqfilter }; +/* Default methods if driver does not specify method */ + +#define null_open (d_open_t *)nullop +#define null_close (d_close_t *)nullop +#define no_read (d_read_t *)enodev +#define no_write (d_write_t *)enodev +#define no_ioctl (d_ioctl_t *)enodev +#define no_mmap (d_mmap_t *)enodev + +static int +no_kqfilter(dev_t dev __unused, struct knote *kn __unused) +{ + + return (1); +} + +static void +no_strategy(struct bio *bp) +{ + + biofinish(bp, NULL, ENODEV); +} + +static int +no_poll(dev_t dev __unused, int events, struct thread *td __unused) +{ + /* + * Return true for read/write. If the user asked for something + * special, return POLLNVAL, so that clients have a way of + * determining reliably whether or not the extended + * functionality is present without hard-coding knowledge + * of specific filesystem implementations. + * Stay in sync with vop_nopoll(). + */ + if (events & ~POLLSTANDARD) + return (POLLNVAL); + + return (events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)); +} + +#define no_dump (dumper_t *)enodev struct cdevsw * devsw(dev_t dev) @@ -276,16 +337,16 @@ make_dev(struct cdevsw *devsw, int minor, uid_t uid, gid_t gid, int perms, const KASSERT((minor & ~0xffff00ff) == 0, ("Invalid minor (0x%x) in make_dev", minor)); - if (devsw->d_open == NULL) devsw->d_open = nullopen; - if (devsw->d_close == NULL) devsw->d_close = nullclose; - if (devsw->d_read == NULL) devsw->d_read = noread; - if (devsw->d_write == NULL) devsw->d_write = nowrite; - if (devsw->d_ioctl == NULL) devsw->d_ioctl = noioctl; - if (devsw->d_poll == NULL) devsw->d_poll = nopoll; - if (devsw->d_mmap == NULL) devsw->d_mmap = nommap; - if (devsw->d_strategy == NULL) devsw->d_strategy = nostrategy; - if (devsw->d_dump == NULL) devsw->d_dump = nodump; - if (devsw->d_kqfilter == NULL) devsw->d_kqfilter = nokqfilter; + if (devsw->d_open == NULL) devsw->d_open = null_open; + if (devsw->d_close == NULL) devsw->d_close = null_close; + if (devsw->d_read == NULL) devsw->d_read = no_read; + if (devsw->d_write == NULL) devsw->d_write = no_write; + if (devsw->d_ioctl == NULL) devsw->d_ioctl = no_ioctl; + if (devsw->d_poll == NULL) devsw->d_poll = no_poll; + if (devsw->d_mmap == NULL) devsw->d_mmap = no_mmap; + if (devsw->d_strategy == NULL) devsw->d_strategy = no_strategy; + if (devsw->d_dump == NULL) devsw->d_dump = no_dump; + if (devsw->d_kqfilter == NULL) devsw->d_kqfilter = no_kqfilter; if (devsw->d_maj == MAJOR_AUTO) { for (i = NUMCDEVSW - 1; i > 0; i--) |
