unw_is_signal_frame - Man Page

check if current frame is a signal frame


#include <libunwind.h>

int unw_is_signal_frame(unw_cursor_t *cp);


The unw_is_signal_frame() routine returns a positive value  if the current frame identified by cp is a signal frame,  also known as a signal trampoline,  and a value of 0 otherwise.  For the purpose of this discussion,  a signal frame is a frame that was created in response to a potentially  asynchronous interruption.  For UNIX and UNIX-like platforms,  such frames are normally created by the kernel when delivering a signal.  In a kernel environment, a signal frame might, for example, correspond  to a frame created in response 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. Otherwise, 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 signal handler.



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

See Also

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


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


29 August 2023 Programming Library