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, 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.

ERRORS

       UNW_ENOINFO
               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)

AUTHOR

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

Programming Library                              29 August 2023                  UNW_IS_SIGNAL_FRAME(3libunwind)