Merge f6ccef1957 into 99ab67143a

Fix infinite loops that prevent graceful termination when the server
receives SIGINT or SIGTERM signals. Without this fix, Ctrl-C and kill
commands are ignored, making it impossible to stop the server cleanly.

Two scenarios cause the infinite loops:

1) The bind() retry loop: When the port is busy, the loop retries
   indefinitely without checking the running flag set by the signal
   handler.

2) The accept() loop: The loop is unconditional, so when accept() is
   interrupted by a signal and returns EINTR, the loop immediately
   restarts, ignoring the shutdown request.

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>

canlogserver.c

@@ -296,10 +296,6 @@ int main(int argc, char **argv)
 		nanosleep(&f, NULL);
 	}
 
-	/*
-	 * Check if loop exited due to signal (during nanosleep) rather than
-	 * successful bind.
-	 */
 	if (!running) {
 		close(socki);
 		return 128 + signal_num;
@@ -325,10 +321,6 @@ int main(int argc, char **argv)
 		}
 	}
 
-	/*
-	 * Check if loop exited due to signal (accept returned EINTR) rather
-	 * than successful fork
-	 */
 	if (!running) {
 		if (accsocket > 0)
 			close(accsocket);

j1939_timedate/j1939_timedate_srv.c

@@ -41,23 +41,17 @@ static void gmtime_to_j1939_pgn_65254_td(struct j1939_time_date_packet *tdp)
 	utc_tm = gmtime_r(&now, &utc_tm_buf);
 	local_tm = localtime_r(&now, &local_tm_buf);
 
-	if (local_tm) {
-		/* Calculate the offsets */
-		hour_offset = local_tm->tm_hour - utc_tm->tm_hour;
-		minute_offset = local_tm->tm_min - utc_tm->tm_min;
+	/* Calculate the offsets */
+	hour_offset = local_tm->tm_hour - utc_tm->tm_hour;
+	minute_offset = local_tm->tm_min - utc_tm->tm_min;
 
-		/* Handle date rollover */
-		if (local_tm->tm_mday != utc_tm->tm_mday) {
-			if (local_tm->tm_hour < 12)
-				hour_offset += 24;  /* past midnight */
-			else
-				hour_offset -= 24;  /* before midnight */
-		}
-	} else {
-		/* The local time offsets cannot be determined at the moment */
-		hour_offset = 0xF9;
-		minute_offset = 0xFF;
-	}		
+	/* Handle date rollover */
+	if (local_tm->tm_mday != utc_tm->tm_mday) {
+		if (local_tm->tm_hour < 12)
+			hour_offset += 24;  /* past midnight */
+		else
+			hour_offset -= 24;  /* before midnight */
+	}
 
 	/*
 	 * Seconds (spn959):

j1939_vehicle_position/j1939_vehicle_position_cmn.h

@@ -51,7 +51,7 @@ struct j1939_vp_err_msg {
 #define J1939_VP1_PRIO_DEFAULT				6
 #define J1939_VP1_MAX_TRANSFER_LENGH \
 	sizeof(struct j1939_vp1_packet)
-#define J1939_VP1_REPETITION_RATE_MS			1000
+#define J1939_VP1_REPETITION_RATE_MS			5000
 #define J1939_VP1_JITTER_MS				500
 
 /**
@@ -63,8 +63,8 @@ struct j1939_vp_err_msg {
  *           - Data Length: 4 bytes
  *           - Resolution: 10^-7 deg/bit
  *           - Offset: -210 degrees
- *           - Range: -210 to +211.10081215 degrees
- *           - Operating Range: -210 degrees (SOUTH) to +211.1081215 degrees
+ *           - Range: -210 to +211.1008122 degrees
+ *           - Operating Range: -210 degrees (SOUTH) to +211.108122 degrees
  *             (NORTH)
  *
  * @longitude: Raw longitude position of the vehicle
@@ -72,8 +72,8 @@ struct j1939_vp_err_msg {
  *           - Data Length: 4 bytes
  *           - Resolution: 10^-7 deg/bit
  *           - Offset: -210 degrees
- *           - Range: -210 to +211.10081215 degrees
- *           - Operating Range: -210 degrees (WEST) to +211.1081215 degrees
+ *           - Range: -210 to +211.1008122 degrees
+ *           - Operating Range: -210 degrees (WEST) to +211.108122 degrees
  *             (EAST)
  *
  * This structure defines each component of the Vehicle Position as described in
@@ -142,48 +142,42 @@ j1939_vp1_set_longitude(struct j1939_vp1_packet *packet, int32_t longitude)
 /**
  * struct j1939_vp2_packet - Represents the PGN 64502 Vehicle
  *                                         Position 2 packet
+ * FIXME: current packet layout is guessed based on limited information:
+ * https://www.isobus.net/isobus/pGNAndSPN/10801?type=PGN
  *
  * @total_satellites: Total number of satellites in view
  *           - SPN: 8128
  *           - Data Length: 1 byte
- *           - Range: 0 to 250
  *
  * @hdop: Horizontal dilution of precision
  *           - SPN: 8129
  *           - Data Length: 1 byte
  *           - Resolution: 0.1
- *           - Range: 0.0 to 25.0
  *
  * @vdop: Vertical dilution of precision
  *           - SPN: 8130
  *           - Data Length: 1 byte
  *           - Resolution: 0.1
- *           - Range: 0.0 to 25.0
  *
  * @pdop: Position dilution of precision
  *           - SPN: 8131
  *           - Data Length: 1 byte
  *           - Resolution: 0.1
- *           - Range: 0.0 to 25.0
  *
  * @tdop: Time dilution of precision
  *           - SPN: 8132
  *           - Data Length: 1 byte
  *           - Resolution: 0.1
- *           - Range: 0.0 to 25.0
  *
  * This structure defines each component of the Vehicle Position 2 as described
  * in PGN 64502.
  */
 struct j1939_vp2_packet {
 	uint8_t total_satellites; /* SPN 8128 */
-	uint8_t hdop;             /* SPN 8129 */
-	uint8_t vdop;             /* SPN 8130 */
-	uint8_t pdop;             /* SPN 8131 */
-	uint8_t tdop;             /* SPN 8132 */
-	uint8_t unused5;          /* Always 0xFF */
-	uint8_t unused6;          /* Always 0xFF */
-	uint8_t unused7;          /* Always 0xFF */
+	uint8_t hdop;			  /* SPN 8129 */
+	uint8_t vdop;			  /* SPN 8130 */
+	uint8_t pdop;			  /* SPN 8131 */
+	uint8_t tdop;			  /* SPN 8132 */
 } __attribute__((__packed__));
 
 /**

j1939_vehicle_position/j1939_vehicle_position_srv.c

@@ -270,12 +270,6 @@ static int j1939_vp2_get_data(struct j1939_vp_srv_priv *priv,
 	j1939_vp2_set_pdop(vp2p, pdop);
 	j1939_vp2_set_tdop(vp2p, tdop);
 
-	/* This PG's last 3 bytes are not assigned and hence must be set
-	 * to 0xFF as per J1939-71, section 5.2 */
-	vp2p->unused5 = 0xFF;
-	vp2p->unused6 = 0xFF;
-	vp2p->unused7 = 0xFF;
-
 	return 0;
 }