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

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

uc_mcontextContains 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. 

RELATED INFORMATION

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