bpo-37085: Expose SocketCAN bcm_msg_head flags

Expose the CAN_BCM SocketCAN constants used in the bcm_msg_head struct
flags (provided by <linux/can/bcm.h>) under the socket library.

This adds the following constants with a CAN_BCM prefix:

  * SETTIMER
  * STARTTIMER
  * TX_COUNTEVT
  * TX_ANNOUNCE
  * TX_CP_CAN_ID
  * RX_FILTER_ID
  * RX_CHECK_DLC
  * RX_NO_AUTOTIMER
  * RX_ANNOUNCE_RESUME
  * TX_RESET_MULTI_IDX
  * RX_RTR_FRAME
  * CAN_FD_FRAME

Author: karlding

Misc/ACKS

@@ -394,6 +394,7 @@ Alon Diamant
 Toby Dickenson
 Mark Dickinson
 Jack Diederich
+Karl Ding
 Daniel Diniz
 Humberto Diogenes
 Yves Dionne

Misc/NEWS.d/next/Library/2019-06-18-16-29-31.bpo-37085.GeYaD6.rst

@@ -0,0 +1 @@
+Added support for the Linux SocketCAN Broadcast Manager API constants.

Modules/socketmodule.c

@@ -7668,6 +7668,42 @@ PyInit__socket(void)
     PyModule_AddIntConstant(m, "CAN_BCM_RX_STATUS", RX_STATUS);
     PyModule_AddIntConstant(m, "CAN_BCM_RX_TIMEOUT", RX_TIMEOUT);
     PyModule_AddIntConstant(m, "CAN_BCM_RX_CHANGED", RX_CHANGED);
+#ifdef  SETTIMER
+    PyModule_AddIntConstant(m, "CAN_BCM_SETTIMER", SETTIMER);
+#endif
+#ifdef  STARTTIMER
+    PyModule_AddIntConstant(m, "CAN_BCM_STARTTIMER", STARTTIMER);
+#endif
+#ifdef  TX_COUNTEVT
+    PyModule_AddIntConstant(m, "CAN_BCM_TX_COUNTEVT", TX_COUNTEVT);
+#endif
+#ifdef  TX_ANNOUNCE
+    PyModule_AddIntConstant(m, "CAN_BCM_TX_ANNOUNCE", TX_ANNOUNCE);
+#endif
+#ifdef  TX_CP_CAN_ID
+    PyModule_AddIntConstant(m, "CAN_BCM_TX_CP_CAN_ID", TX_CP_CAN_ID);
+#endif
+#ifdef  RX_FILTER_ID
+    PyModule_AddIntConstant(m, "CAN_BCM_RX_FILTER_ID", RX_FILTER_ID);
+#endif
+#ifdef  RX_CHECK_DLC
+    PyModule_AddIntConstant(m, "CAN_BCM_RX_CHECK_DLC", RX_CHECK_DLC);
+#endif
+#ifdef  RX_NO_AUTOTIMER
+    PyModule_AddIntConstant(m, "CAN_BCM_RX_NO_AUTOTIMER", RX_NO_AUTOTIMER);
+#endif
+#ifdef  RX_ANNOUNCE_RESUME
+    PyModule_AddIntConstant(m, "CAN_BCM_RX_ANNOUNCE_RESUME", RX_ANNOUNCE_RESUME);
+#endif
+#ifdef  TX_RESET_MULTI_IDX
+    PyModule_AddIntConstant(m, "CAN_BCM_TX_RESET_MULTI_IDX", TX_RESET_MULTI_IDX);
+#endif
+#ifdef  RX_RTR_FRAME
+    PyModule_AddIntConstant(m, "CAN_BCM_RX_RTR_FRAME", RX_RTR_FRAME);
+#endif
+#ifdef  CAN_FD_FRAME
+    PyModule_AddIntConstant(m, "CAN_BCM_CAN_FD_FRAME", CAN_FD_FRAME);
+#endif
 #endif
 #ifdef SOL_RDS
     PyModule_AddIntMacro(m, SOL_RDS);