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83 lines
3 KiB
TeX
83 lines
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\_get\_proc\_name}{David Mosberger-Tang}{Programming Library}{unw\_get\_proc\_name}unw\_get\_proc\_name -- get name of 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\_get\_proc\_name}(\Type{unw\_cursor\_t~*}\Var{cp}, \Type{char~*}\Var{bufp}, \Type{size\_t} \Var{len}, \Type{unw\_word\_t~*}\Var{offp});\\
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\section{Description}
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The \Func{unw\_get\_proc\_name}() routine returns the name of the
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procedure that created the stack frame identified by argument
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\Var{cp}. The \Var{bufp} argument is a pointer to a character buffer
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that is at least \Var{len} bytes long. This buffer is used to return
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the name of the procedure. The \Var{offp} argument is a pointer to a
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word that is used to return the byte-offset of the instruction-pointer
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saved in the stack frame identified by \Var{cp}, relative to the start
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of the procedure. For example, if procedure \Func{foo}() starts at
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address 0x40003000, then invoking \Func{unw\_get\_proc\_name}() on a
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stack frame with an instruction-pointer value of 0x40003080 would
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return a value of 0x80 in the word pointed to by \Var{offp} (assuming
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the procedure is at least 0x80 bytes long).
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Note that on some platforms there is no reliable way to distinguish
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between procedure names and ordinary labels. Furthermore, if symbol
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information has been stripped from a program, procedure names may be
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completely unavailable or may be limited to those exported via a
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dynamic symbol table. In such cases, \Func{unw\_get\_proc\_name}()
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may return the name of a label or a preceeding (nearby) procedure.
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However, the offset returned through \Var{offp} is always relative to
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the returned name, which ensures that the value (address) of the
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returned name plus the returned offset will always be equal to the
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instruction-pointer of the stack frame identified by \Var{cp}.
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\section{Return Value}
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On successful completion, \Func{unw\_get\_proc\_name}() 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\_get\_proc\_name}() is thread-safe but \emph{not} safe to
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use from a 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 determine
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the name of the procedure.
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\item[\Const{UNW\_ENOMME}] The procedure name is too long to fit
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in the buffer provided. A truncated version of the name has been
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returned.
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\end{Description}
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In addition, \Func{unw\_get\_proc\_name}() 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\_get\_proc\_info(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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