diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-04 14:18:53 +0000 |
---|---|---|
committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-04 14:18:53 +0000 |
commit | a0e0018c9a7ef5ce7f6d2c3ae16aecbbd16a8f67 (patch) | |
tree | 8feaf1a1932871b139b3b30be4c09c66489918be /netem/normal.c | |
parent | Initial commit. (diff) | |
download | iproute2-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.c | 51 |
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; +} |