Index: uspace/lib/math/Makefile
===================================================================
--- uspace/lib/math/Makefile	(revision 9d1f37142372e184fd953b52d8a7f8a2c2ddc8c0)
+++ uspace/lib/math/Makefile	(revision ace1bca41468e8c2409a37c799088907b37e6366)
@@ -39,4 +39,5 @@
 	generic/fabs.c \
 	generic/fmod.c \
+	generic/round.c \
 	generic/trig.c \
 	generic/trunc.c
Index: uspace/lib/math/generic/round.c
===================================================================
--- uspace/lib/math/generic/round.c	(revision ace1bca41468e8c2409a37c799088907b37e6366)
+++ uspace/lib/math/generic/round.c	(revision ace1bca41468e8c2409a37c799088907b37e6366)
@@ -0,0 +1,107 @@
+/*
+ * Copyright (c) 2015 Jiri Svoboda
+ * Copyright (c) 2014 Martin Decky
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/** @addtogroup libmath
+ * @{
+ */
+/** @file
+ */
+
+#include <math.h>
+#include <float.h>
+#include <stdint.h>
+
+/**
+ * Rounds its argument to the nearest integer value in floating-point format,
+ * rounding halfway cases away from zero, regardless of the current rounding
+ * direction.
+ */
+float roundf(float val)
+{
+	/* If the input is a nan, return a canonical nan. */
+	if (isnan(val))
+		return __builtin_nanf("");
+
+	const int exp_bias = FLT_MAX_EXP - 1;
+	const int mant_bits = FLT_MANT_DIG - 1;
+
+	union {
+		float f;
+		uint32_t i;
+	} u = { .f = fabsf(val) };
+
+	int exp = (u.i >> mant_bits) - exp_bias;
+
+	/* If value is less than 0.5, return zero with appropriate sign. */
+	if (exp < -1)
+		return copysignf(0.0f, val);
+
+	/* If exponent is exactly mant_bits, adding 0.5 could change the result. */
+	if (exp >= mant_bits)
+		return val;
+
+	/* Use trunc with adjusted value to do the rounding. */
+	return copysignf(truncf(u.f + 0.5), val);
+}
+
+/**
+ * Rounds its argument to the nearest integer value in floating-point format,
+ * rounding halfway cases away from zero, regardless of the current rounding
+ * direction.
+ */
+double round(double val)
+{
+	/* If the input is a nan, return a canonical nan. */
+	if (isnan(val))
+		return __builtin_nan("");
+
+	const int exp_bias = DBL_MAX_EXP - 1;
+	const int mant_bits = DBL_MANT_DIG - 1;
+
+	union {
+		double f;
+		uint64_t i;
+	} u = { .f = fabs(val) };
+
+	int exp = ((int)(u.i >> mant_bits)) - exp_bias;
+
+	/* If value is less than 0.5, return zero with appropriate sign. */
+	if (exp < -1)
+		return copysign(0.0, val);
+
+	/* If exponent is exactly mant_bits, adding 0.5 could change the result. */
+	if (exp >= mant_bits)
+		return val;
+
+	/* Use trunc with adjusted value to do the rounding. */
+	return copysign(trunc(u.f + 0.5), val);
+}
+
+/** @}
+ */