HOST_AT_FDCWD
return host_syscall(SYS_openat, HOST_AT_FDCWD, (uintptr_t)path, flags, mode);
return host_syscall(SYS_newfstatat, HOST_AT_FDCWD, (uintptr_t)path, (uintptr_t)sb, 0);
return host_syscall(SYS_symlinkat, HOST_AT_FDCWD, path1, path2);
return host_syscall(SYS_mkdirat, HOST_AT_FDCWD, (uintptr_t)path, mode);