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tools/munin-plugins-busybox/swap.c

@@ -0,0 +1,78 @@
+#include <string.h>
+#include <stdio.h>
+#include <unistd.h>
+#include "common.h"
+
+int swap(int argc, char **argv) {
+	FILE *f;
+	char buff[256];
+	int in, out;
+	if(argc > 1) {
+		if(!strcmp(argv[1], "config")) {
+			puts("graph_title Swap in/out\n"
+				"graph_args -l 0 --base 1000\n"
+				"graph_vlabel pages per ${graph_period} in (-) / out (+)\n"
+				"graph_category system\n"
+				"swap_in.label swap\n"
+				"swap_in.type DERIVE\n"
+				"swap_in.max 100000\n"
+				"swap_in.min 0\n"
+				"swap_in.graph no\n"
+				"swap_out.label swap\n"
+				"swap_out.type DERIVE\n"
+				"swap_out.max 100000\n"
+				"swap_out.min 0\n"
+				"swap_out.negative swap_in");
+
+			return 0;
+		}
+		if(!strcmp(argv[1], "autoconf")) {
+			if(0 == access("/proc/stat", R_OK))
+				return writeyes();
+			else
+				return writeno("/proc/stat not readable");
+		}
+	}
+	if(!access("/proc/vmstat", F_OK)) {
+		in=out=0;
+		if(!(f=fopen("/proc/vmstat", "r"))) {
+			fputs("cannot open /proc/vmstat\n", stderr);
+			return 1;
+		}
+		while(fgets(buff, 256, f)) {
+			if(!in && !strncmp(buff, "pswpin ", 7)) {
+				++in;
+				printf("swap_in.value %s", buff+7);
+			}
+			else if(!out && !strncmp(buff, "pswpout ", 8)) {
+				++out;
+				printf("swap_out.value %s", buff+8);
+			}
+		}
+		fclose(f);
+		if(!in*out) {
+			fputs("no usable data on /proc/vmstat\n", stderr);
+			return 1;
+		}
+		return 0;
+	} else {
+		if(!(f=fopen("/proc/stat", "r"))) {
+			fputs("cannot open /proc/stat\n", stderr);
+			return 1;
+		}
+		while(fgets(buff, 256, f)) {
+			if(!strncmp(buff, "swap ", 5)) {
+				fclose(f);
+				if(2 != sscanf(buff+5, "%d %d", &in, &out)) {
+					fputs("bad data on /proc/stat\n", stderr);
+					return 1;
+				}
+				printf("swap_in.value %d\nswap_out.value %d\n", in, out);
+				return 0;
+			}
+		}
+		fclose(f);
+		fputs("no swap line found in /proc/stat\n", stderr);
+		return 1;
+	}
+}