+ /* Blocked signals do not interrupt any syscalls.
+ * In this case syscalls don't return ERESTARTfoo codes.
+ *
+ * Deadly signals set to SIG_DFL interrupt syscalls
+ * and kill the process regardless of which of the codes below
+ * is returned by the interrupted syscall.
+ * In some cases, kernel forces a kernel-generated deadly
+ * signal to be unblocked and set to SIG_DFL (and thus cause
+ * death) if it is blocked or SIG_IGNed: for example, SIGSEGV
+ * or SIGILL. (The alternative is to leave process spinning
+ * forever on the faulty instruction - not useful).
+ *
+ * SIG_IGNed signals and non-deadly signals set to SIG_DFL
+ * (for example, SIGCHLD, SIGWINCH) interrupt syscalls,
+ * but kernel will always restart them.
+ */