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O_NONBLOCK15include/asm-alpha/fcntl.h#define O_NONBLOCK   00004
O_NONBLOCK15include/asm-i386/fcntl.h#define O_NONBLOCK   04000
O_NONBLOCK12include/asm-mips/fcntl.h#define O_NONBLOCK  0x0080
O_NONBLOCK15include/asm-ppc/fcntl.h#define O_NONBLOCK   04000
O_NONBLOCK18include/asm-sparc/fcntl.h#define O_NONBLOCK  0x4000