const runtime._AT_NULL

3 uses

	runtime (current package)
		os_linux.go#L222: 	_AT_NULL     = 0  // End of vector
		os_linux.go#L292: 	auxvreadbuf[len(auxvreadbuf)-2] = _AT_NULL
		os_linux.go#L304: 	for ; auxv[i] != _AT_NULL; i += 2 {