LINUX_FIONCLEX
#define LINUX_FIONCLEX 0x5450
#define LINUX_FIONCLEX _LINUX_IO('f', 2)
#define LINUX_FIONCLEX _LINUX_IO('T', 0x50)
#define LINUX_FIONCLEX _LINUX_IO('T', 80)
#define LINUX_FIONCLEX _LINUX_IO('T', 80)
#define LINUX_FIONCLEX _LINUX_IO('T', 80)
#define LINUX_FIONCLEX 0x6602 /* Linux sources: "need to be adjusted" */
#define LINUX_FIONCLEX _LINUX_IO('f', 2)