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67 lines
2 KiB
TeX
67 lines
2 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\_is\_signal\_frame}{David Mosberger-Tang}{Programming Library}{unw\_is\_signal\_frame}unw\_is\_signal\_frame -- check if current frame is a signal 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\_is\_signal\_frame}(\Type{unw\_cursor\_t~*}\Var{cp});\\
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\section{Description}
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The \Func{unw\_is\_signal\_frame}() routine returns a positive value
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if the current frame identified by \Var{cp} is a signal frame, and a
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value of 0 otherwise. For the purpose of this discussion, a signal
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frame is a frame that was created in response to a potentially
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asynchronous interruption. For UNIX and UNIX-like platforms, such
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frames are normally created by the kernel when delivering a signal.
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In a kernel-environment, a signal frame might, for example, correspond
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to a frame created in response to a device interrupt.
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Signal frames are somewhat unusual because the asynchronous nature of
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the events that create them require storing the contents of registers
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that are normally treated as scratch (``caller-saved'') registers.
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\section{Return Value}
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On successful completion, \Func{unw\_is\_signal\_frame}() returns a
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positive value if the current frame is a signal frame, or 0 if it is
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not. Otherwise, a 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\_is\_signal\_frame}() is thread-safe as well as safe to use
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from a signal handler.
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\section{Errors}
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\begin{Description}
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\item[\Const{UNW\_ENOINFO}] \Prog{Libunwind} is unable to determine
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whether or not the current frame is a signal frame.
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\end{Description}
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\section{See Also}
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\SeeAlso{libunwind(3)},
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\SeeAlso{unw\_get\_reg(3)},
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\SeeAlso{unw\_set\_reg(3)},
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\SeeAlso{unw\_get\_fpreg(3)},
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\SeeAlso{unw\_set\_fpreg(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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