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Index: share/man/man9/Makefile
===================================================================
--- share/man/man9/Makefile
+++ share/man/man9/Makefile
@@ -1281,6 +1281,7 @@
MLINKS+=random.9 arc4rand.9 \
random.9 arc4random.9 \
random.9 read_random.9 \
+ random.9 read_random_uio.9 \
random.9 srandom.9
MLINKS+=refcount.9 refcount_acquire.9 \
refcount.9 refcount_init.9 \
Index: share/man/man9/random.9
===================================================================
--- share/man/man9/random.9
+++ share/man/man9/random.9
@@ -26,7 +26,7 @@
.\"
.\" $FreeBSD$
.\" "
-.Dd June 30, 2015
+.Dd July 12, 2015
.Dt RANDOM 9
.Os
.Sh NAME
@@ -34,6 +34,7 @@
.Nm arc4random ,
.Nm random ,
.Nm read_random ,
+.Nm read_random_uio ,
.Nm srandom
.Nd supply pseudo-random numbers
.Sh SYNOPSIS
@@ -50,6 +51,8 @@
.In sys/random.h
.Ft int
.Fn read_random "void *buffer" "int count"
+.Ft int
+.Fn read_random_uio "struct uio *uio" "int flags"
.Sh DESCRIPTION
The
.Fn random
@@ -117,11 +120,28 @@
that no entropy
has been returned.
.Pp
+The
+.Fn read_random_uio
+function behaves identically to
+.Xr read 2
+on
+.Pa /dev/random .
+The
+.Fa uio
+argument points to a buffer where random data should be stored.
+This function only returns data if the the random device is seeded.
+It blocks if unseeded,
+except when the
+.Fa flags
+argument is set to
+.Dv O_NONBLOCK .
+.Pp
All the bits returned by
.Fn random ,
-.Fn arc4rand
+.Fn arc4rand ,
+.Fn read_random ,
and
-.Fn read_random
+.Fn read_random_uio
are usable.
For example,
.Sq Li random()&01
@@ -168,6 +188,10 @@
function returns
the number of bytes placed in
.Fa buffer .
+.Pp
+.Fn read_random_uio
+returns zero when successful,
+otherwise an error code is returned.
.Sh AUTHORS
.An Dan Moschuk
wrote
Index: sys/compat/cloudabi/cloudabi_random.c
===================================================================
--- sys/compat/cloudabi/cloudabi_random.c
+++ sys/compat/cloudabi/cloudabi_random.c
@@ -26,13 +26,28 @@
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
+#include <sys/types.h>
+#include <sys/random.h>
+#include <sys/uio.h>
+
#include <compat/cloudabi/cloudabi_proto.h>
int
cloudabi_sys_random_get(struct thread *td,
struct cloudabi_sys_random_get_args *uap)
{
+ struct iovec iov = {
+ .iov_base = uap->buf,
+ .iov_len = uap->nbyte
+ };
+ struct uio uio = {
+ .uio_iov = &iov,
+ .uio_iovcnt = 1,
+ .uio_resid = iov.iov_len,
+ .uio_segflg = UIO_USERSPACE,
+ .uio_rw = UIO_READ,
+ .uio_td = td
+ };
- /* Not implemented. */
- return (ENOSYS);
+ return (read_random_uio(&uio, 0));
}
Index: sys/dev/random/randomdev.c
===================================================================
--- sys/dev/random/randomdev.c
+++ sys/dev/random/randomdev.c
@@ -134,6 +134,13 @@
static int
randomdev_read(struct cdev *dev __unused, struct uio *uio, int flags)
{
+
+ return (read_random_uio(uio, flags));
+}
+
+int
+read_random_uio(struct uio *uio, int flags)
+{
uint8_t *random_buf;
int c, error;
ssize_t nbytes;
Index: sys/sys/random.h
===================================================================
--- sys/sys/random.h
+++ sys/sys/random.h
@@ -31,7 +31,10 @@
#ifdef _KERNEL
+struct uio;
+
u_int read_random(void *, u_int);
+int read_random_uio(struct uio *, int);
/*
* Note: if you add or remove members of random_entropy_source, remember to also update the

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