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.TH "UNW\\_IS\\_SIGNAL\\_FRAME" "3" "16 August 2007" "Programming Library " "Programming Library "
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.SH NAME
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unw_is_signal_frame
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\-\- check if current frame is a signal frame
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.PP
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.SH SYNOPSIS
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.PP
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#include <libunwind.h>
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.br
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.PP
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int
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unw_is_signal_frame(unw_cursor_t *cp);
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.br
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.PP
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.SH DESCRIPTION
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.PP
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The unw_is_signal_frame()
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routine returns a positive value
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if the current frame identified by cp
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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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.PP
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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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.PP
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.SH RETURN VALUE
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.PP
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On successful completion, unw_is_signal_frame()
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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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.PP
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.SH THREAD AND SIGNAL SAFETY
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.PP
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unw_is_signal_frame()
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is thread\-safe as well as safe to use
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from a signal handler.
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.PP
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.SH ERRORS
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.PP
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.TP
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UNW_ENOINFO
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Libunwind
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is unable to determine
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whether or not the current frame is a signal frame.
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.PP
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.SH SEE ALSO
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.PP
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libunwind(3),
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unw_get_reg(3),
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unw_set_reg(3),
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unw_get_fpreg(3),
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unw_set_fpreg(3)
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.PP
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.SH AUTHOR
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.PP
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David Mosberger\-Tang
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.br
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Email: \fBdmosberger@gmail.com\fP
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.br
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WWW: \fBhttp://www.nongnu.org/libunwind/\fP\&.
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