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\begin{Name}{3libunwind}{unw\_apply\_reg\_state}{David Mosberger-Tang}{Programming Library}{unw\_apply\_reg\_state}unw\_apply\_reg\_state -- apply a register state update to a cursor
\end{Name}

\section{Synopsis}

\File{\#include $<$libunwind.h$>$}\\

\Type{int}
\Func{unw\_apply\_reg\_state}(\Type{unw\_cursor\_t~*}\Var{cp},
\Type{void~*}\Var{reg\_states\_data});\\

\section{Description}

The \Func{unw\_apply\_reg\_state}() routine updates the register values
of a cursor according to the instructions in \Var{reg\_states\_data},
which have been obtained by calling \Var{unw\_reg\_states\_iterate}.

\section{Return Value}

On successful completion, \Func{unw\_apply\_reg\_state}() returns 0.
Otherwise the negative value of one of the error codes below is
returned.

\section{Thread and Signal Safety}

\Func{unw\_apply\_reg\_state}() is thread safe.  If cursor \Var{cp} is
in the local address space, this routine is also safe to use from a
signal handler.

\section{Errors}

\begin{Description}
\item[\Const{UNW\_EUNSPEC}] An unspecified error occurred.
\item[\Const{UNW\_ENOINFO}] \Prog{Libunwind} was unable to locate
  unwind-info for the procedure.
\item[\Const{UNW\_EBADVERSION}] The unwind info for the procedure has
  version or format that is not understood by \Prog{libunwind}.
\end{Description}
In addition, \Func{unw\_apply\_reg\_state}() may return any error
returned by the \Func{access\_mem}() call-back (see
\Func{unw\_create\_addr\_space}(3libunwind)).

\section{See Also}

\SeeAlso{libunwind}(3libunwind),
\SeeAlso{unw\_reg\_states\_iterate}(3libunwind)

\section{Author}

\noindent
David Mosberger-Tang\\
Email: \Email{dmosberger@gmail.com}\\
WWW: \URL{http://www.nongnu.org/libunwind/}.
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