sentences:  POSIX.1 does not specify whether codice_1 and codice_2 save and restore the current set of blocked signals; if a program employs signal handling it should use POSIX's codice_17/codice_18.The C99 Rationale describes codice_8 as being an array type for backward compatibility; existing code refers to codice_8 storage locations by name (without the codice_21 address-of operator), which is only possible for array types.When a "non-local goto" is executed via codice_1/codice_2 in C++, normal "stack unwinding" does not occur.