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 current frame identified
       by cp is a signal frame, 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.

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/.