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84 lines
3.3 KiB
TeX
84 lines
3.3 KiB
TeX
\documentclass{article}
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\usepackage[fancyhdr,pdf]{latex2man}
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\input{common.tex}
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\begin{document}
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\begin{Name}{3}{unw\_reg\_states\_iterate}{David Mosberger-Tang}{Programming Library}{unw\_reg\_states\_iterate}unw\_reg\_states\_iterate -- get register state info on current procedure
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\end{Name}
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\section{Synopsis}
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\File{\#include $<$libunwind.h$>$}\\
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\Type{int} \Func{unw\_reg\_states\_iterate}(\Type{unw\_cursor\_t~*}\Var{cp}, \Type{unw\_reg\_states\_callback}\Var{cb}, \Type{void~*}\Var{token});\\
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\section{Description}
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The \Func{unw\_reg\_states\_iterate}() routine provides
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information about the procedure that created the stack frame
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identified by argument \Var{cp}. The \Var{cb} argument is a pointer
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to a function of type \Type{unw\_reg\_states\_callback} which is used to
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return the information. The function \Type{unw\_reg\_states\_callback} has the
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following definition:
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\Type{int} (~*\Var{unw\_reg\_states\_callback})(\Type{void~*}\Var{token},
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\Type{void~*}\Var{reg\_states\_data},
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\Type{size\_t} \Var{reg\_states\_data\_size},
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\Type{unw\_word\_t} \Var{start\_ip}, \Type{unw\_word\_t} \Var{end\_ip});
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The callback function may be invoked several times for each call of \Func{unw\_reg\_states\_iterate}. Each call is associcated with a instruction address range and a set of instructions on how to update register values when returning from the procedure in that address range. For each invocation, the arguments to the callback function are:
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\begin{description}
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\item[\Type{void~*} \Var{token}] The token value passed to \Var{unw\_reg\_states\_callback}. \\
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\item[\Type{void~*} \Var{reg\_states\_data}] A pointer to data about
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updating register values. This data, or a copy of it, can be passed
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to \Var{unw\_apply\_reg\_state}.\\
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\item[\Type{int} \Var{reg\_states\_data\_size}] The size of the register update data. \\
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\item[\Type{unw\_word\_t} \Var{start\_ip}] The address of the first
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instruction of the address range. \\
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\item[\Type{unw\_word\_t} \Var{end\_ip}] The address of the first
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instruction \emph{beyond} the end of the address range. \\
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\end{description}
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\section{Return Value}
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On successful completion, \Func{unw\_reg\_states\_iterate}() returns
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0. If the callback function returns a nonzero value, that indicates
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failure and the function returns immediately. Otherwise the negative
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value of one of the error-codes below is returned.
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\section{Thread and Signal Safety}
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\Func{unw\_reg\_states\_iterate}() is thread-safe. If cursor \Var{cp} is
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in the local address-space, this routine is also safe to use from a
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signal handler.
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\section{Errors}
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\begin{Description}
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\item[\Const{UNW\_EUNSPEC}] An unspecified error occurred.
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\item[\Const{UNW\_ENOINFO}] \Prog{Libunwind} was unable to locate
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unwind-info for the procedure.
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\item[\Const{UNW\_EBADVERSION}] The unwind-info for the procedure has
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version or format that is not understood by \Prog{libunwind}.
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\end{Description}
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In addition, \Func{unw\_reg\_states\_iterate}() may return any error
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returned by the \Func{access\_mem}() call-back (see
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\Func{unw\_create\_addr\_space}(3)).
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\section{See Also}
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\SeeAlso{libunwind(3)},
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\SeeAlso{unw\_apply\_reg\_state(3)}
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\section{Author}
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\noindent
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David Mosberger-Tang\\
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Email: \Email{dmosberger@gmail.com}\\
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WWW: \URL{http://www.nongnu.org/libunwind/}.
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\LatexManEnd
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\end{document}
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