2003-04-01 09:19:34 +02:00
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\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\_step}{David Mosberger-Tang}{Programming Library}{unw\_step}unw\_step -- advance to next stack frame
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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\_step}(\Type{unw\_cursor\_t~*}\Var{cp});\\
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\section{Description}
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The \Func{unw\_step}() routine advances the unwind cursor \Var{cp} to
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the next older, less deeply nested stack frame.
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\section{Return Value}
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On successful completion, \Func{unw\_step}() returns a positive value
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2003-11-22 07:11:18 +01:00
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if the updated cursor refers to a valid stack frame, or 0 if the
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previous stack frame was the last frame in the chain. On error, the
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negative value of one of the error-codes below is returned.
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2003-04-01 09:19:34 +02:00
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\section{Thread and Signal Safety}
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2004-03-31 09:42:38 +02:00
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\Func{unw\_step}() is thread-safe. If cursor \Var{cp} is in the local
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address-space, this routine is also safe to use from a signal handler.
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2003-04-01 09:19:34 +02:00
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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 the
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unwind-info needed to complete the operation.
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\item[\Const{UNW\_EBADVERSION}] The unwind-info needed to complete the
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operation has a version or a format that is not understood by
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\Prog{libunwind}.
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\item[\Const{UNW\_EINVALIDIP}] The instruction-pointer
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(``program-counter'') of the next stack frame is invalid (e.g., not
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properly aligned).
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\item[\Const{UNW\_EBADFRAME}] The next stack frame is invalid.
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\item[\Const{UNW\_ESTOPUNWIND}] Returned if a call to
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\Func{find\_proc\_info}() returned -\Const{UNW\_ESTOPUNWIND}.
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\end{Description}
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In addition, \Func{unw\_step}() may return any error returned by the
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\Func{find\_proc\_info}(), \Func{get\_dyn\_info\_list\_addr}(),
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\Func{access\_mem}(), \Func{access\_reg}(), or \Func{access\_fpreg}()
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call-backs (see \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\_create\_addr\_space(3)}
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\section{Author}
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\noindent
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David Mosberger-Tang\\
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Hewlett-Packard Labs\\
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Palo-Alto, CA 94304\\
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Email: \Email{davidm@hpl.hp.com}\\
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WWW: \URL{http://www.hpl.hp.com/research/linux/libunwind/}.
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\LatexManEnd
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\end{document}
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