mirror of
https://github.com/tobast/libunwind-eh_elf.git
synced 2024-11-17 21:47:37 +01:00
93 lines
3.4 KiB
TeX
93 lines
3.4 KiB
TeX
\documentclass{article}
|
|
\usepackage[fancyhdr,pdf]{latex2man}
|
|
|
|
\input{common.tex}
|
|
|
|
\begin{document}
|
|
|
|
\begin{Name}{3}{unw\_get\_proc\_info\_by\_ip}{David Mosberger-Tang}{Programming Library}{unw\_get\_proc\_info\_by\_ip}unw\_get\_proc\_info\_by\_ip -- get procedure info by IP
|
|
\end{Name}
|
|
|
|
\section{Synopsis}
|
|
|
|
\File{\#include $<$libunwind.h$>$}\\
|
|
|
|
\Type{int} \Func{unw\_get\_proc\_info\_by\_ip}(\Type{unw\_addr\_space\_t~}\Var{as}, \Type{unw\_word\_t~}\Var{ip}, \Type{unw\_proc\_info\_t~*}\Var{pip}, \Type{void~*}\Var{arg});\\
|
|
|
|
\section{Description}
|
|
|
|
The \Func{unw\_get\_proc\_info\_by\_ip}() routine returns the same
|
|
kind of auxiliary information about a procedure as
|
|
\Func{unw\_get\_proc\_info}(), except that the info is looked up by
|
|
instruction-pointer (IP) instead of a cursor. This is more flexible
|
|
because it is possible to look up the info for an arbitrary procedure,
|
|
even if it is not part of the current call-chain. However, since it
|
|
is more flexible, it also tends to run slower (and often much slower)
|
|
than \Func{unw\_get\_proc\_info}().
|
|
|
|
The routine expects the followins arguments: \Var{as} is the
|
|
address-space in which the instruction-pointer should be looked up.
|
|
For a look-up in the local address-space,
|
|
\Var{unw\_local\_addr\_space} can be passed for this argument.
|
|
Argument \Var{ip} is the instruction-pointer for which the procedure
|
|
info should be looked up and \Var{pip} is a pointer to a structure of
|
|
type \Type{unw\_proc\_info\_t} which is used to return the info.
|
|
Lastly, \Var{arg} is the address-space argument that should be used
|
|
when accessing the address-space. It has the same purpose as the
|
|
argument of the same name for \Func{unw\_init\_remote}(). When
|
|
accessing the local address-space (first argument is
|
|
\Var{unw\_local\_addr\_space}), \Const{NULL} must be passed for this
|
|
argument.
|
|
|
|
Note that for the purposes of \Prog{libunwind}, the code of a
|
|
procedure is assumed to occupy a single, contiguous range of
|
|
addresses. For this reason, it is alwas possible to describe the
|
|
extent of a procedure with the \Var{start\_ip} and \Var{end\_ip}
|
|
members. If a single function/routine is split into multiple,
|
|
discontiguous pieces, \Prog{libunwind} will treat each piece as a
|
|
separate procedure.
|
|
|
|
\section{Return Value}
|
|
|
|
On successful completion, \Func{unw\_get\_proc\_info\_by\_ip}()
|
|
returns 0. Otherwise the negative value of one of the error-codes
|
|
below is returned.
|
|
|
|
\section{Thread and Signal Safety}
|
|
|
|
\Func{unw\_get\_proc\_info}() is thread-safe. If the local
|
|
address-space is passed in argument \Var{as}, 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\_get\_proc\_info}() may return any error
|
|
returned by the \Func{access\_mem}() call-back (see
|
|
\Func{unw\_create\_addr\_space}(3)).
|
|
|
|
\section{See Also}
|
|
|
|
\SeeAlso{libunwind(3)},
|
|
\SeeAlso{unw\_create\_addr\_space(3)},
|
|
\SeeAlso{unw\_get\_proc\_name(3)},
|
|
\SeeAlso{unw\_get\_proc\_info(3)},
|
|
\SeeAlso{unw\_init\_remote(3)}
|
|
|
|
\section{Author}
|
|
|
|
\noindent
|
|
David Mosberger-Tang\\
|
|
Hewlett-Packard Labs\\
|
|
Palo-Alto, CA 94304\\
|
|
Email: \Email{davidm@hpl.hp.com}\\
|
|
WWW: \URL{http://www.hpl.hp.com/research/linux/libunwind/}.
|
|
\LatexManEnd
|
|
|
|
\end{document}
|