+
+/*
+ * Function SignalRestart
+ * Initialize a signal handler.
+ * To enable the signal handling a process we need to tell it to
+ * kernel; this is done writing all needed info to a sigaction structure
+ * named sigact, and then callind sigaction() system call passing the
+ * information stored in the sigact structure variable.
+ * This version enable BSD semantics with SA_RESTART
+ *
+ * Input: the signal to handle
+ * the signal handler function
+ * Return: the previous sigaction structure
+ */
+inline SigFunc * SignalRestart(int signo, SigFunc *func)
+{
+ struct sigaction new_handl, old_handl;
+ new_handl.sa_handler = func; /* set signal handler */
+ new_handl.sa_flags = SA_RESTART; /* restart system call */
+ /* clear signal mask: no signal blocked during execution of func */
+ if (sigemptyset(&new_handl.sa_mask)!=0){ /* initialize signal set */
+ return SIG_ERR;
+ }
+ /* change action for signo signal */
+ if (sigaction(signo, &new_handl, &old_handl)){
+ return SIG_ERR;
+ }
+ return (old_handl.sa_handler);
+}
+
+