plugins: adding C version of multicpu1sec

plugins/system/multicpu1sec/multicpu1sec-c.c

@@ -0,0 +1,76 @@
+/*
+ * multicpu1sec C plugin
+ */
+#include <stdio.h>
+#include <string.h>
+
+#define PROC_STAT "/proc/stat"
+
+int fail(char* msg) {
+	perror(msg);
+
+	return 1;
+}
+
+int config() {
+	/* Get the number of CPU */
+	FILE* f;
+	if ( !(f=fopen(PROC_STAT, "r")) ) {
+		return fail("cannot open " PROC_STAT);
+	}
+
+	// Starting with -1, since the first line is the "global cpu line"
+	int ncpu = -1;
+	while (! feof(f)) {
+		char buffer[1024];
+		if (fgets(buffer, 1024, f) == 0) {
+			break;
+		}
+
+		if (! strncmp(buffer, "cpu", 3)) ncpu ++;
+	}
+
+	fclose(f);
+
+	printf(
+		"graph_title multicpu1sec\n"
+		"graph_category system::1sec\n"
+		"graph_vlabel average cpu use %\n"
+		"graph_scale no\n"
+		"graph_total All CPUs\n"
+		"update_rate 1\n"
+		"graph_data_size custom 1d, 10s for 1w, 1m for 1t, 5m for 1y\n"
+	);
+
+	int i;
+	for (i = 0; i < ncpu; i++) {
+		printf("cpu%d.label CPU %d\n", i, i);
+		printf("cpu%d.draw %s\n", i, "AREASTACK");
+		printf("cpu%d.min 0\n", i);
+	}
+
+
+}
+
+int acquire() {
+	printf("acquire()\n");
+}
+
+int fetch() {
+	printf("fetch()\n");
+}
+
+int main(int argc, char **argv) {
+	if (argc > 1) {
+		char* first_arg = argv[1];
+		if (! strcmp(first_arg, "config")) {
+			return config();
+		}
+
+		if (! strcmp(first_arg, "acquire")) {
+			return acquire();
+		}
+	}
+
+	return fetch();
+}