configurable tcp keepalive interval

debian/patches/sipwise/db_postgres-timeout

@@ -66,29 +66,32 @@
  		}
 --- a/modules/db_postgres/pg_mod.c
 +++ b/modules/db_postgres/pg_mod.c
-@@ -61,6 +61,7 @@
+@@ -61,6 +61,8 @@
  					  * 0 disables reconnecting */
  
  int pg_lockset = 4;
 +int pg_timeout = 0; /* default = no timeout */
++int pg_keepalive = 0;
  
  /*
   * Postgres module interface
-@@ -92,6 +93,7 @@
+@@ -92,6 +94,8 @@
  static param_export_t params[] = {
  	{"retries",         PARAM_INT, &pg_retries },
  	{"lockset",         PARAM_INT, &pg_lockset },
 +	{"timeout",         PARAM_INT, &pg_timeout },
++	{"tcp_keepalive",   PARAM_INT, &pg_keepalive },
  	{0, 0, 0}
  };
  
 --- a/modules/db_postgres/pg_mod.h
 +++ b/modules/db_postgres/pg_mod.h
-@@ -41,6 +41,7 @@
+@@ -41,6 +41,8 @@
   */
  
  extern int pg_retries;
 +extern int pg_timeout;
++extern int pg_keepalive;
  
  /** @} */
  
@@ -153,6 +156,18 @@
  		goto error;
  	}
  	
+@@ -285,6 +304,11 @@
+ 	    PQprotocolVersion(pcon->con), 0 );
+ #endif
+ 
++#ifdef TCP_KEEPIDLE
++	if (pg_keepalive)
++		setsockopt(PQsocket(pcon->con), IPPROTO_TCP, TCP_KEEPIDLE, &pg_keepalive);
++#endif
++
+ 	ret = timestamp_format(pcon->con);
+ 	if (ret == 1 || ret == -1) {
+ 		/* Assume INT8 representation if detection fails */
 --- a/modules/db_postgres/km_pg_con.c
 +++ b/modules/db_postgres/km_pg_con.c
 @@ -26,6 +26,7 @@
@@ -209,3 +224,15 @@
  
  	if( (ptr->con == 0) || (PQstatus(ptr->con) != CONNECTION_OK) )
  	{
+@@ -88,6 +110,11 @@
+ 	ptr->timestamp = time(0);
+ 	ptr->id = id;
+ 
++#ifdef TCP_KEEPIDLE
++	if (pg_keepalive)
++		setsockopt(PQsocket(ptr->con), IPPROTO_TCP, TCP_KEEPIDLE, &pg_keepalive);
++#endif
++
+ 	return ptr;
+ 
+  err: