NAME

       unw_init_local -- initialize cursor for local unwinding

SYNOPSIS

       #include <libunwind.h>

       int unw_init_local(unw_cursor_t *c, unw_context_t *ctxt);

DESCRIPTION

       The  unw_init_local()  routine  initializes  the  unwind  cursor  pointed to by c with the
       machine-state in the context structure pointed to by ctxt.   As  such,  the  machine-state
       pointed  to  by  ctxt  identifies  the  initial stack frame at which unwinding starts. The
       machine-state must remain valid for the duration for which the cursor c is in use.

       The unw_init_local() routine can be used only for unwinding in the address  space  of  the
       current  process (i.e., for local unwinding).  For all other cases, unw_init_remote() must
       be used instead.  From a behavioral point of view, the call:

           ret = unw_init_local(&cursor, &ucontext);

       is equivalent to:

           ret = unw_init_remote(&cursor, unw_local_addr_space,
                                 &ucontext);

       However,  unwind  performance  may  be  better   when   using   unw_init_local().    Also,
       unw_init_local()  is  available even when UNW_LOCAL_ONLY has been defined before including
       <libunwind.h>, whereas unw_init_remote() is not.

RETURN VALUE

       On successful completion, unw_init_local() returns 0.  Otherwise the negative value of one
       of the error-codes below is returned.

THREAD AND SIGNAL SAFETY

       unw_init_local() is thread-safe as well as safe to use from a signal handler.

ERRORS

       UNW_EINVAL
               unw_init_local()  was  called  in  a  version  of  libunwind which supports remote
              unwinding  only  (this  normally  happens  when  calling  unw_init_local()  for   a
              cross-platform version of libunwind).

       UNW_EUNSPEC
               An unspecified error occurred.

       UNW_EBADREG
               A register needed by unw_init_local() wasn't accessible.

SEE ALSO

       libunwind(3), unw_init_remote(3)

AUTHOR

       David Mosberger-Tang
       Email: dmosberger@gmail.com
       WWW: http://www.nongnu.org/libunwind/.