+
+bool
+mmap (int fd, void *addr, unsigned length)
+{
+ return syscall (SYS_mmap, fd, addr, length);
+}
+
+bool
+munmap (void *addr, unsigned length)
+{
+ return syscall (SYS_munmap, addr, length);
+}
+
+bool
+chdir (const char *dir)
+{
+ return syscall (SYS_chdir, dir);
+}
+
+bool
+mkdir (const char *dir)
+{
+ return syscall (SYS_mkdir, dir);
+}
+
+void
+lsdir (void)
+{
+ syscall (SYS_lsdir);
+}
+