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tools/munin-plugins-busybox/forks.c

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+#include <string.h>
+#include <stdio.h>
+#include <unistd.h>
+#include "common.h"
+
+int forks(int argc, char **argv) {
+	FILE *f;
+	char buff[256];
+	if(argc > 1) {
+		if(!strcmp(argv[1], "config")) {
+			puts("graph_title Fork rate\n"
+				"graph_args --base 1000 -l 0 \n"
+				"graph_vlabel forks / ${graph_period}\n"
+				"graph_category processes\n"
+				"graph_info This graph shows the forking rate (new processes started).\n"
+				"forks.label forks\n"
+				"forks.type DERIVE\n"
+				"forks.min 0\n"
+				"forks.max 100000\n"
+				"forks.info The number of forks per second.");
+			return 0;
+		}
+		if(!strcmp(argv[1], "autoconf")) {
+			if(0 == access("/proc/stat", R_OK))
+				return writeyes();
+			else
+				return writeno("/proc/stat not readable");
+		}
+	}
+	if(!(f=fopen("/proc/stat", "r"))) {
+		fputs("cannot open /proc/stat\n", stderr);
+		return 1;
+	}
+	while(fgets(buff, 256, f)) {
+		if(!strncmp(buff, "processes ", 10)) {
+			fclose(f);
+			printf("forks.value %s", buff+10);
+			return 0;
+		}
+	}
+	fclose(f);
+	fputs("no processes line found in /proc/stat\n", stderr);
+	return 1;
+}