stew

commit f10f52f1d5dfa787bd6b1ef53b857fdf57987119
parent 3f0a47dcd15e1c7f761a5fb713a5171d9df04814
Author: rpa <rpa@laika>
Date:   Sun, 18 Dec 2022 21:01:58 +0000

src/bps: a primitive pipe speed monitor

Diffstat:
A
src/bps/bps.c
 | 
27
+++++++++++++++++++++++++++
A
src/bps/mkfile
 | 
5
+++++

2 files changed, 32 insertions(+), 0 deletions(-)
diff --git a/src/bps/bps.c b/src/bps/bps.c
@@ -0,0 +1,27 @@
+/*
+	bps - bytes per second
+*/
+#include <u.h>
+#include <libc.h>
+
+#define BSize 8192
+
+void
+main(void)
+{
+	char *buf = malloc(BSize);
+	long n;
+	vlong start = nsec(), cur, bytes = 0;;
+	for (;;) {
+		n = read(0, buf, BSize);
+		bytes += n;
+		write(1, buf, n);
+		if (n <= 0) return;
+		cur = nsec();
+		if (cur - start > 1000000000) {
+			fprint(2, "%lld\n", bytes);
+			start = cur;
+			bytes = 0;
+		}
+	}
+}
diff --git a/src/bps/mkfile b/src/bps/mkfile
@@ -0,0 +1,5 @@
+</$objtype/mkfile
+TARG=bps
+OFILES=bps.$O
+BIN=/$objtype/bin
+</sys/src/cmd/mkone