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UCONTEXT(3)		 BSD Library Functions Manual		   UCONTEXT(3)

NAME
     ucontext -- user thread context

LIBRARY
     Standard C	Library	(libc, -lc)

SYNOPSIS
     #include <ucontext.h>

DESCRIPTION
     The ucontext_t type is a structure	type suitable for holding the context
     for a user	thread of execution.  A	thread's context includes its stack,
     saved registers, and list of blocked signals.

     The ucontext_t structure contains at least	these fields:

	ucontext_t *uc_link	 context to assume when	this one returns
	sigset_t uc_sigmask	 signals being blocked
	stack_t	uc_stack	 stack area
	mcontext_t uc_mcontext	 saved registers

     The uc_link field points to the context to	resume when this context's en-
     try point function	returns.  If uc_link is	equal to NULL, then the
     process exits when	this context returns.

     The uc_mcontext field is machine-dependent	and should be treated as
     opaque by portable	applications.

     The following functions are defined to manipulate ucontext_t structures:

	int getcontext(ucontext_t *);
	ucontext_t * getcontextx(void);
	int setcontext(const ucontext_t	*);
	void makecontext(ucontext_t *, void (*)(void), int, ...);
	int swapcontext(ucontext_t *, const ucontext_t *);

SEE ALSO
     sigaltstack(2), getcontext(3), getcontextx(3), makecontext(3)

BSD			      September	10, 2002			   BSD

NAME | LIBRARY | SYNOPSIS | DESCRIPTION | SEE ALSO

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