On Sun, Jan 22, 2017 at 10:58:38AM +0800, zhouxianrong wrote: > 1. memset is just set a int value but i want to set a long value. memset doesn't set an int value. DESCRIPTION The memset() function fills the first n bytes of the memory area pointed to by s with the constant byte c. It sets a byte value. K&R just happened to choose 'int' as the type to store that "unsigned char" in. Probably for very good reasons which make absolutely no sense today. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx"> email@xxxxxxxxx </a>