NAME

ucontext − user context

SYNOPSIS

#include <ucontext.h>
       

DESCRIPTION

The thread of control within an executing process is specified by the ucontext structure.  This structure contains at least the following members:

ucontext_t  uc_link
       sigset_t    uc_sigmask
       stack_t     uc_stack
       mcontext_t  uc_mcontext

The values for each member is as follows:

uc_link
Points to the context that is to continue when this context returns. If uc_link is equal to zero (0), this is the main context, and the process exits when this context returns. 

uc_sigmask
Specifies the set of signals that are blocked when this context is active.  See sigprocmask(2) for more information. 

uc_stack
Specifies the stack used by this context.  See sigaltstack(2) for more information. 

uc_mcontext
Contains the saved machine registers and any implementation-specific context data.

RESTRICTIONS

Portable applications should not access or modify the uc_mcontext value in the ucontext structure. 

SEE ALSO

Functions: getcontext(2), sigaction(2), sigprocmask(2), sigaltstack(2).