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authorOleksij Rempel <o.rempel@pengutronix.de>2017-03-22 10:14:36 +0100
committerSascha Hauer <s.hauer@pengutronix.de>2017-03-30 08:23:20 +0200
commit35ca79bb22b64c4fc78691743ce42379c29fd247 (patch)
tree43770e3423757414fedae4ea9dea8c67e6197406 /commands/stddev.c
parent451733ac8a5020d92b4ce4b1566bcb08f8cacc71 (diff)
downloadbarebox-35ca79bb22b64c4fc78691743ce42379c29fd247.tar.gz
fs: add prng device
this should provide easy access to get_random_bytes() interfaces. Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'commands/stddev.c')
-rw-r--r--commands/stddev.c29
1 files changed, 29 insertions, 0 deletions
diff --git a/commands/stddev.c b/commands/stddev.c
index 318d057..93da2c7 100644
--- a/commands/stddev.c
+++ b/commands/stddev.c
@@ -17,6 +17,7 @@
#include <common.h>
#include <init.h>
+#include <stdlib.h>
static ssize_t zero_read(struct cdev *cdev, void *buf, size_t count, loff_t offset, ulong flags)
{
@@ -100,3 +101,31 @@ static int null_init(void)
}
device_initcall(null_init);
+
+static ssize_t prng_read(struct cdev *cdev, void *buf, size_t count, loff_t offset, ulong flags)
+{
+ get_random_bytes(buf, count);
+ return count;
+}
+
+static struct file_operations prngops = {
+ .read = prng_read,
+ .lseek = dev_lseek_default,
+};
+
+static int prng_init(void)
+{
+ struct cdev *cdev;
+
+ cdev = xzalloc(sizeof (*cdev));
+
+ cdev->name = "prng";
+ cdev->flags = DEVFS_IS_CHARACTER_DEV;
+ cdev->ops = &prngops;
+
+ devfs_create(cdev);
+
+ return 0;
+}
+
+device_initcall(prng_init);