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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/.