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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-04 14:18:53 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-04 14:18:53 +0000
commita0e0018c9a7ef5ce7f6d2c3ae16aecbbd16a8f67 (patch)
tree8feaf1a1932871b139b3b30be4c09c66489918be /netem/normal.c
parentInitial commit. (diff)
downloadiproute2-a0e0018c9a7ef5ce7f6d2c3ae16aecbbd16a8f67.tar.xz
iproute2-a0e0018c9a7ef5ce7f6d2c3ae16aecbbd16a8f67.zip
Adding upstream version 6.1.0.upstream/6.1.0upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r--netem/normal.c51
1 files changed, 51 insertions, 0 deletions
diff --git a/netem/normal.c b/netem/normal.c
new file mode 100644
index 0000000..90963f4
--- /dev/null
+++ b/netem/normal.c
@@ -0,0 +1,51 @@
+/*
+ * Normal distribution table generator
+ * Taken from the uncopyrighted NISTnet code.
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include <string.h>
+#include <limits.h>
+
+#include <linux/types.h>
+#include <linux/pkt_sched.h>
+
+#define TABLESIZE 16384
+#define TABLEFACTOR NETEM_DIST_SCALE
+
+static double
+normal(double x, double mu, double sigma)
+{
+ return .5 + .5*erf((x-mu)/(sqrt(2.0)*sigma));
+}
+
+
+int
+main(int argc, char **argv)
+{
+ int i, n;
+ double x;
+ double table[TABLESIZE+1];
+
+ for (x = -10.0; x < 10.05; x += .00005) {
+ i = rint(TABLESIZE * normal(x, 0.0, 1.0));
+ table[i] = x;
+ }
+
+
+ printf("# This is the distribution table for the normal distribution.\n");
+ for (i = n = 0; i < TABLESIZE; i += 4) {
+ int value = (int) rint(table[i]*TABLEFACTOR);
+ if (value < SHRT_MIN) value = SHRT_MIN;
+ if (value > SHRT_MAX) value = SHRT_MAX;
+
+ printf(" %d", value);
+ if (++n == 8) {
+ putchar('\n');
+ n = 0;
+ }
+ }
+
+ return 0;
+}