--- /dev/null
+++ Libc/Libc-391.4.1/pthreads/tests/pthread_atfork_test.c
@@ -0,0 +1,65 @@
+#include <assert.h>
+#include <pthread.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+
+/*
+ * Parent and child handlers are called in the order they were registered
+ * prepare handlers are called in reverse order. The non-commutative
+ * operations will ensure that we are calling them in the proper order.
+ */
+
+static int parentval = 0;
+static int childval = 0;
+
+static void prepare1(void)
+{
+	parentval *= 2;
+}
+
+static void prepare2(void)
+{
+	parentval = 3;
+}
+
+static void parent1(void)
+{
+	parentval += 4;
+}
+
+static void parent2(void)
+{
+	parentval *= 3;
+}
+
+static void child1(void)
+{
+	childval = 5;
+}
+
+static void child2(void)
+{
+	childval *= 3;
+}
+
+int
+main(void)
+{
+	pid_t pid, child;
+	int status;
+
+	assert(!pthread_atfork(prepare1, parent1, child1));
+	assert(!pthread_atfork(prepare2, parent2, child2));
+	pid = fork();
+	assert(pid >= 0);
+	if (pid == 0) {
+		_exit(childval);
+	} else {
+		child = waitpid(pid, &status, 0);
+		assert(child == pid);
+		assert(WIFEXITED(status));
+		assert(WEXITSTATUS(status) == 15);
+		assert(parentval == 30);
+	}
+	return 0;
+}