Added a clone() test to test0.

tasks/test0/include/tests.h

@@ -9,5 +9,6 @@ int mmaptest(void);
 int dirtest(void);
 int fileio(void);
 int fileio2(void);
+int clonetest(void);
 
 #endif /* __TEST0_TESTS_H__ */

tasks/test0/main.c

@@ -62,6 +62,9 @@ void main(void)
 			printf("-- FAILED --\n");
 	}
 
+	printf("Testing clone syscall...\n");
+	clonetest();
+
 	while (1)
 		wait_pager(0);
 #if 0

tasks/test0/src/clone.c

@@ -0,0 +1,42 @@
+/*
+ * Clone test.
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/mman.h>
+#include <sched.h>
+#include <errno.h>
+
+int my_thread_func(void *arg)
+{
+	printf("Cloned child running...\n");
+	printf("PID: %d\n", getpid());
+	_exit(0);
+}
+
+int clonetest(void)
+{
+	pid_t childid;
+	void *child_stack;
+
+	if ((child_stack = mmap(0, 0x1000, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE | MAP_GROWSDOWN, 0, 0)) == MAP_FAILED) {
+		printf("MMAP failed.\n");
+		_exit(1);
+	} else {
+		printf("Mapped area starting at %p\n", child_stack);
+	}
+	((int *)child_stack)[-1] = 5; /* Test mapped area */
+
+	printf("Cloning...\n");
+
+	if ((childid = clone(my_thread_func, child_stack,
+			     CLONE_PARENT | CLONE_FS | CLONE_VM | CLONE_THREAD | CLONE_SIGHAND, 0)) < 0) {
+		perror("CLONE failed.\n");
+	} else {
+		printf("Cloned a new thread with child pid %d\n", childid);
+	}
+	return 0;
+}
+