ucontext(5)							   ucontext(5)

NAME    [Toc]    [Back]

     ucontext -	user context

SYNOPSIS    [Toc]    [Back]

     #include <ucontext.h>

DESCRIPTION    [Toc]    [Back]

     The ucontext structure defines the	context	of a thread of control within
     an	executing process.

     This structure includes at	least the following members:

     ucontext_t	*uc_link
     sigset_t	 uc_sigmask
     stack_t	 uc_stack
     mcontext_t	 uc_mcontext

     uc_link is	a pointer to the context that is to be resumed when this
     context returns.  If uc_link is equal to 0, then this context is the main
     context, and the process exits when this context returns.	The uc_link
     field is only meaningful for contexts created using makecontext.

     uc_sigmask	defines	the set	of signals that	are blocked when this context
     is	active (see sigprocmask(2)).

     uc_stack defines the stack	used by	this context (see sigaltstack(2)).

     uc_mcontext contains the saved set	of machine registers and any
     implementation specific context data.  Portable applications should not
     modify or access uc_mcontext.

SEE ALSO    [Toc]    [Back]

     getcontext(2), sigaction(2), sigaltstack(2), sigprocmask(2),
     makecontext(3C)


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