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UCONTEXT(3)	       FreeBSD 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
     entry 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.

SEE ALSO
     sigaltstack(2)

BUGS
     The getcontext(), setcontext(), makecontext(), and swapcontext() func-
     tions are not yet implemented in this version of FreeBSD.

FreeBSD 4.9			 Sep 10, 2002			   FreeBSD 4.9

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