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/usr/include/asm-generic/ucontext.h is in linux-libc-dev 4.9.144-3.

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#ifndef __ASM_GENERIC_UCONTEXT_H
#define __ASM_GENERIC_UCONTEXT_H

struct ucontext {
	unsigned long	  uc_flags;
	struct ucontext  *uc_link;
	stack_t		  uc_stack;
	struct sigcontext uc_mcontext;
	sigset_t	  uc_sigmask;	/* mask last for extensibility */
};

#endif /* __ASM_GENERIC_UCONTEXT_H */