tag	line	file	source code
O_NONBLOCK	15	include/asm-alpha/fcntl.h	#define O_NONBLOCK   00004
O_NONBLOCK	15	include/asm-i386/fcntl.h	#define O_NONBLOCK   04000
O_NONBLOCK	19	include/asm-sparc/fcntl.h	#define O_NONBLOCK  0x4000