Add check_loadtrend, to measure changes in CPU load.

.gitignore

@@ -0,0 +1,3 @@
+check_loadtrend
+check_sslcert
+*.o

Makefile

@@ -1,9 +1,11 @@
-#CFLAGS=-O2 -Wall -Wmissing-prototypes -Wstrict-prototypes -Werror
-LDFLAGS=-lssl
+CFLAGS=-O2 -Wall -Wmissing-prototypes -Wstrict-prototypes -Werror
 
-CHECKS=check_sslcert
+CHECKS=check_loadtrend check_sslcert
 
 all: $(CHECKS)
 
+check_sslcert: check_sslcert.o
+	$(CC) $(LDFLAGS) -lssl -o check_sslcert check_sslcert.o
+
 clean:
 	rm -f *.o *.core *~ $(CHECKS)

check_loadtrend.c

@@ -0,0 +1,102 @@
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+static void
+usage(void)
+{
+	fprintf(stderr,
+"usage: check_loadtrend [-m minimum per-cpu load cutoff]\n"
+"                       [-c critical ratio] [-w warning ratio]\n");
+	exit(1);
+}
+
+static double
+getdouble(const char *str)
+{
+	double number;
+	char *ep;
+
+	errno = 0;
+	number = strtod(str, &ep);
+	if (errno != 0 || *str == '\0' || *ep != '\0') {
+		fprintf(stderr, "%s: invalid number\n", str);
+		exit(1);
+	}
+	return (number);
+}
+
+static void
+testratio(double load1, double load2, double ratio,
+    const char *severity, int code, int loadtime)
+{
+
+	if (load1 >= ratio * load2) {
+		printf(
+"%s - load1 / load%d = %.2lf / %.2lf = %.2lf >= %.2lf\n",
+		    severity, loadtime, load1, load2, load1 / load2, ratio);
+		exit(code);
+	}
+}
+
+int
+main(int argc, char *argv[])
+{
+	int ch;
+	double minload = 1.5, critratio = 1.5, warnratio = 1.1;
+	double ladv[3];
+	long ncpus;
+
+	while ((ch = getopt(argc, argv, "c:m:w:")) != -1) {
+		switch (ch) {
+		case 'c':
+			critratio = getdouble(optarg);
+			break;
+		case 'm':
+			minload = getdouble(optarg);
+			break;
+		case 'w':
+			warnratio = getdouble(optarg);
+			break;
+		default:
+			usage();
+		}
+	}
+	argv += optind;
+	argc -= optind;
+	if (argc != 0)
+		usage();
+
+	if (getloadavg(ladv, 3) == -1) {
+		printf("CRITICAL - Failed to obtain load averages: %s",
+		    strerror(errno));
+		return (2);
+	}
+
+	ncpus = sysconf(_SC_NPROCESSORS_ONLN);
+	if (ncpus == -1) {
+		printf(
+"CRITICAL - Failed to obtain the number of online CPUs: %s",
+		    strerror(errno));
+		return (2);
+	}
+
+	if (ladv[0] < minload * ncpus) {
+		printf("OK - load1 = %.2lf < %.2lf\n",
+		    ladv[0], minload * ncpus);
+		return (0);
+	}
+
+	testratio(ladv[0], ladv[1], critratio, "CRITICAL", 2, 5);
+	testratio(ladv[0], ladv[2], critratio, "CRITICAL", 2, 15);
+	testratio(ladv[0], ladv[1], warnratio, "WARNING", 1, 5);
+	testratio(ladv[0], ladv[2], warnratio, "WARNING", 1, 15);
+
+	printf("OK - load1 / load5 = %.2lf / %.2lf = %.2lf,"
+	           " load1 / load15 = %.2lf / %.2lf = %.2lf\n",
+	    ladv[0], ladv[1], ladv[0] / ladv[1],
+	    ladv[0], ladv[2], ladv[0] / ladv[2]);
+	return (0);
+}

check_sslcert.c

@@ -134,7 +134,7 @@ getnum(const char *str)
 int
 main(int argc, char *argv[])
 {
-	int i, ch, ret;
+	int ch, ret;
 
 	while ((ch = getopt(argc, argv, "c:w:")) != -1) {
 		switch (ch) {

debian/changelog

@@ -1,3 +1,9 @@
+nagios-plugins-kumina (1.0-1KUMIRELEASE10) unstable; urgency=low
+
+  * Add check_loadtrend.
+
+ -- Ed Schouten <ed@kumina.nl>  Fri, 22 Apr 2011 13:52:20 +0200
+
 nagios-plugins-kumina (1.0-1KUMIRELEASE9) unstable; urgency=low
 
   * Remove debugging printfs.

debian/control

@@ -10,4 +10,4 @@ Depends: ${shlibs:Depends}
 Description: Nagios plugins provided by Kumina
  The Nagios plugins by Kumina package installs additional plugins for
  Nagios. Currently it only installs a plugin to check for SSL
- certificate validity.
+ certificate validity and a plugin to measure trends in CPU load.

debian/rules

@@ -20,6 +20,8 @@ install: build
 		${NPDIR}/usr/share/doc/nagios-plugins-kumina
 	install -m 644 debian/copyright \
 		${NPDIR}/usr/share/doc/nagios-plugins-kumina
+	install -m 755 check_loadtrend \
+		${NPDIR}/usr/lib/nagios/plugins
 	install -m 755 check_sslcert \
 		${NPDIR}/usr/lib/nagios/plugins
 	dh_installchangelogs