diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/char/random.c | 24 |
1 files changed, 22 insertions, 2 deletions
diff --git a/drivers/char/random.c b/drivers/char/random.c index 2faeef28c209..0cf98bd4f2d2 100644 --- a/drivers/char/random.c +++ b/drivers/char/random.c @@ -370,6 +370,7 @@ static struct poolinfo { */ static DECLARE_WAIT_QUEUE_HEAD(random_read_wait); static DECLARE_WAIT_QUEUE_HEAD(random_write_wait); +static struct fasync_struct *fasync; #if 0 static int debug; @@ -533,8 +534,11 @@ static void credit_entropy_bits(struct entropy_store *r, int nbits) r->entropy_count = r->poolinfo->POOLBITS; /* should we wake readers? */ - if (r == &input_pool && r->entropy_count >= random_read_wakeup_thresh) + if (r == &input_pool && + r->entropy_count >= random_read_wakeup_thresh) { wake_up_interruptible(&random_read_wait); + kill_fasync(&fasync, SIGIO, POLL_IN); + } spin_unlock_irqrestore(&r->lock, flags); } @@ -742,8 +746,10 @@ static size_t account(struct entropy_store *r, size_t nbytes, int min, else r->entropy_count = reserved; - if (r->entropy_count < random_write_wakeup_thresh) + if (r->entropy_count < random_write_wakeup_thresh) { wake_up_interruptible(&random_write_wait); + kill_fasync(&fasync, SIGIO, POLL_OUT); + } } DEBUG_ENT("debiting %d entropy credits from %s%s\n", @@ -1100,17 +1106,31 @@ static long random_ioctl(struct file *f, unsigned int cmd, unsigned long arg) } } +static int random_fasync(int fd, struct file *filp, int on) +{ + return fasync_helper(fd, filp, on, &fasync); +} + +static int random_release(struct inode *inode, struct file *filp) +{ + return fasync_helper(-1, filp, 0, &fasync); +} + const struct file_operations random_fops = { .read = random_read, .write = random_write, .poll = random_poll, .unlocked_ioctl = random_ioctl, + .fasync = random_fasync, + .release = random_release, }; const struct file_operations urandom_fops = { .read = urandom_read, .write = random_write, .unlocked_ioctl = random_ioctl, + .fasync = random_fasync, + .release = random_release, }; /*************************************************************** |