Automation testing tools.

userland/testbin/spinner/spinner.c

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+/*
+ * spinner.c
+ * 
+ * Spins as hard as it can, forking multiple processes as needed. Intended to
+ * test our ability to detect stuck processes in userspace.
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <err.h>
+
+static
+void
+spin(void)
+{
+	volatile int i;
+	
+	for (i=0; i <= 1000; i++) {
+		if (i == 1000) {
+			i = 0;
+		}
+	}
+}
+
+int
+main(int argc, char **argv)
+{
+	int i, count, pid;
+
+	if (argc != 2) {
+		errx(1, "Usage: spinner <count>");
+	}
+	count = atoi(argv[1]);
+
+	for (i = 1; i < count; i++) {
+		pid = fork();
+		if (pid != 0) {
+			spin();
+		}
+	}
+	spin();
+	errx(2, "spinner: spin returned");
+
+	// 09 Jan 2015 : GWA : Shouldn't get here.
+	return 0;
+}