// gsl_error_handler_t * gsl_set_error_handler_off ()
func SetErrorHandlerOff() *GslErrorHandler {
oldHandler := uintptr(unsafe.Pointer(C.gsl_set_error_handler_off()))
prevPtr := uintptr(C.get_go_gsl_error_handler_ptr())
C.set_go_gsl_error_handler_ptr(unsafe.Pointer(nil))
if oldHandler == 0 {
// No previous handler installed.
return nil
}
if prevPtr != 0 {
// The previous handler was a Go handler, reuse the returned structure.
return (*GslErrorHandler)(unsafe.Pointer(prevPtr))
} else {
// The previous handler was a C handler, create a new Go structure for it via closure.
return &GslErrorHandler{
cptr: oldHandler,
cSideHandler: true,
Handler: func(reason string, file string, line int, gslError GslError) {
cReason := C.CString(reason)
cFile := C.CString(file)
C.call_gsl_error_handler((*C.gsl_error_handler_t)(unsafe.Pointer(oldHandler)),
cReason, cFile, C.int(line), C.int(gslError))
C.free(unsafe.Pointer(cReason))
C.free(unsafe.Pointer(cFile))
},
}
}
}
// gsl_error_handler_t * gsl_set_error_handler (gsl_error_handler_t * new_handler)
func SetErrorHandler(handler *GslErrorHandler) *GslErrorHandler {
var prevPtr uintptr
var oldHandler uintptr
if handler.cptr == 0 {
if handler.cSideHandler {
panic("nil gsl_error_handler_t pointer in reused native handler record")
}
handler.cptr = uintptr(C.go_gsl_error_handler_proxy)
prevPtr = uintptr(C.get_go_gsl_error_handler_ptr())
C.set_go_gsl_error_handler_ptr(unsafe.Pointer(handler))
}
if handler.cSideHandler {
// Install the original handler and clear the Go handler structure global.
prevPtr = uintptr(C.get_go_gsl_error_handler_ptr())
C.set_go_gsl_error_handler_ptr(unsafe.Pointer(nil))
} else {
// Install the original handler and set the Go handler global to the given
// go side structure - we also hold a reference to keep the Go GC from deallocating it.
global_GSL_HANDLER_HELD_REFERENCE = handler
prevPtr = uintptr(C.get_go_gsl_error_handler_ptr())
C.set_go_gsl_error_handler_ptr(unsafe.Pointer(handler))
}
// Set the new handler active.
oldHandler = uintptr(unsafe.Pointer(C.gsl_set_error_handler((*C.gsl_error_handler_t)(C.get_go_gsl_error_handler_proxy_addr()))))
if oldHandler == 0 {
// No previous handler installed.
return nil
}
if prevPtr != 0 {
// The previous handler was a Go handler, reuse the returned structure.
return (*GslErrorHandler)(unsafe.Pointer(prevPtr))
} else {
// The previous handler was a C handler, create a new Go structure for it via closure.
return &GslErrorHandler{
cptr: oldHandler,
cSideHandler: true,
Handler: func(reason string, file string, line int, gslError GslError) {
cReason := C.CString(reason)
cFile := C.CString(file)
C.call_gsl_error_handler((*C.gsl_error_handler_t)(unsafe.Pointer(oldHandler)),
cReason, cFile, C.int(line), C.int(gslError))
C.free(unsafe.Pointer(cReason))
C.free(unsafe.Pointer(cFile))
},
}
}
}