2003-03-31 21:57:09 +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\_init\_remote}{David Mosberger-Tang}{Programming Library}{unw\_init\_remote}unw\_init\_remote -- initialize cursor for remote unwinding
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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\_init\_remote}(\Type{unw\_cursor\_t~*}\Var{c}, \Type{unw\_addr\_space\_t~}\Var{as}, \Type{void~*}\Var{arg});\\
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\section{Description}
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The \Func{unw\_init\_remote}() routine initializes the unwind cursor
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pointed to by \Var{c} for unwinding in the address space identified by
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\Var{as}. The \Var{as} argument can either be set to
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\Var{unw\_local\_addr\_space} (local address space) or to an arbitrary
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address space created with \Func{unw\_create\_addr\_space}().
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The \Var{arg} void-pointer tells the address space exactly what entity
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should be unwound. For example, if \Var{unw\_local\_addr\_space} is
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passed in \Var{as}, then \Var{arg} needs to be a pointer to a context
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structure containing the machine-state of the initial stack frame.
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However, other address-spaces may instead expect a process-id, a
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thread-id, or a pointer to an arbitrary structure which identifies the
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stack-frame chain to be unwound. In other words, the interpretation
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of \Var{arg} is entirely dependent on the address-space in use;
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\Prog{libunwind} never interprets the argument in any way on its own.
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Note that \Func{unw\_init\_remote}() can be used to initiate unwinding
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in \emph{any} process, including the local process in which the
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unwinder itself is running. However, for local unwinding, it is
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generally preferable to use \Func{unw\_init\_local}() instead, because
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it is easier to use and because it may perform better.
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\section{Return Value}
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On successful completion, \Func{unw\_init\_remote}() returns 0.
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Otherwise the negative value of one of the error-codes below is
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returned.
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\section{Thread and Signal Safety}
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\Func{unw\_init\_remote}() is thread-safe as well as 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\_EINVAL}] \Func{unw\_init\_remote}() was called in a
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version of \Prog{libunwind} which supports local unwinding only
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(this normally happens when defining \Const{UNW\_LOCAL\_ONLY} before
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including \File{$<$libunwind.h$>$} and then calling
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\Func{unw\_init\_remote}()).
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\item[\Const{UNW\_EUNSPEC}] An unspecified error occurred.
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\item[\Const{UNW\_EBADREG}] A register needed by \Func{unw\_init\_remote}()
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wasn't accessible.
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\end{Description}
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\section{See Also}
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\SeeAlso{libunwind(3)}, \SeeAlso{unw\_create\_addr\_space(3)},
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\SeeAlso{unw\_init\_local(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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