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/usr/include/x86_64-linux-gnu/asm/prctl.h is in linux-libc-dev 4.4.0-21.37.

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#ifndef _ASM_X86_PRCTL_H
#define _ASM_X86_PRCTL_H

#define ARCH_SET_GS 0x1001
#define ARCH_SET_FS 0x1002
#define ARCH_GET_FS 0x1003
#define ARCH_GET_GS 0x1004

#endif /* _ASM_X86_PRCTL_H */