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UNW_IS_SIGNAL_FRAME(3)	     Programming Library	UNW_IS_SIGNAL_FRAME(3)

NAME
       unw_is_signal_frame -- check if current frame is	a signal frame

SYNOPSIS
       #include	<libunwind.h>

       int unw_is_signal_frame(unw_cursor_t *cp);

DESCRIPTION
       The  unw_is_signal_frame() routine returns a positive value if the cur-
       rent frame identified by	cp is a	signal frame, and a value of 0	other-
       wise.  For  the	purpose	 of this discussion, a signal frame is a frame
       that was	created	in response to a  potentially  asynchronous  interrup-
       tion.  For  UNIX	and UNIX-like platforms, such frames are normally cre-
       ated by the kernel when delivering a signal.  In	a  kernel-environment,
       a signal	frame might, for example, correspond to	a frame	created	in re-
       sponse to a device interrupt.

       Signal frames are somewhat unusual because the asynchronous  nature  of
       the  events  that create	them require storing the contents of registers
       that are	normally treated as scratch (``caller-saved'') registers.

RETURN VALUE
       On successful  completion,  unw_is_signal_frame()  returns  a  positive
       value if	the current frame is a signal frame, or	0 if it	is not.	Other-
       wise, a negative	value of one of	the error-codes	below is returned.

THREAD AND SIGNAL SAFETY
       unw_is_signal_frame() is	thread-safe as well as safe to use from	a sig-
       nal handler.

ERRORS
       UNW_ENOINFO
	       Libunwind  is  unable  to  determine whether or not the current
	      frame is a signal	frame.

SEE ALSO
       libunwind(3),   unw_get_reg(3),	  unw_set_reg(3),    unw_get_fpreg(3),
       unw_set_fpreg(3)

AUTHOR
       David Mosberger-Tang
       Email: dmosberger@gmail.com
       WWW: http://www.nongnu.org/libunwind/.

Programming Library		16 August 2007		UNW_IS_SIGNAL_FRAME(3)

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | THREAD AND SIGNAL SAFETY | ERRORS | SEE ALSO | AUTHOR

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