UNW_IS_SIGNAL_FRAME(3libunwind)                           Programming Library

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)