Rename signal.sender to signal.sender_usr2 so it is specific to SIGUSR2 (#101).

src/include/pv-internal.h

@@ -236,7 +236,7 @@ struct pvstate_s {
 		struct timespec toffset;	 /* total time spent stopped */
 #ifdef PV_REMOTE_CONTROL
 		volatile sig_atomic_t rxusr2;	 /* whether SIGUSR2 was received */
-		volatile pid_t sender;		 /* PID of sending process for SIGUSR2 */
+		volatile pid_t sender_usr2;	 /* PID of sending process for SIGUSR2 */
 #endif
 	} signal;
 

src/pv/signal.c

@@ -239,7 +239,7 @@ static void pv_sig_usr2( /*@unused@ */  __attribute__((unused))
 		return;
 	if (NULL == info)
 		return;
-	pv_sig_state->signal.sender = info->si_pid;
+	pv_sig_state->signal.sender_usr2 = info->si_pid;
 	pv_sig_state->signal.rxusr2 = 1;
 }
 
@@ -255,7 +255,7 @@ bool pv_sigusr2_received(pvstate_t state, pid_t * pid)
 	if (0 == state->signal.rxusr2)
 		return false;
 	if (NULL != pid)
-		*pid = state->signal.sender;
+		*pid = state->signal.sender_usr2;
 	state->signal.rxusr2 = 0;
 	return true;
 }