Ok, forget my pyfile_writeobject_nosignal.patch, it's not the right approach.

New patch: mywrite() uses its own implementation PyFile_WriteString(), sys_pyfile_write(), which doesn't call PyErr_CheckSignals():


/* Implementation of PyFile_WriteString() no calling PyErr_CheckSignals():
 * mywrite() should not execute any Python signal handler to avoid raising an
 * error because mywrite() ignores all errors */