srdb1: keep PID per DB connection

- print warning when PID mismatches - it is cross-process shared DB
  connection
- initial patch by Robert Verspuy

lib/srdb1/db_id.c

@@ -30,6 +30,7 @@
 #include "db_id.h"
 #include "../../dprint.h"
 #include "../../mem/mem.h"
+#include "../../pt.h"
 #include "../../ut.h"
 #include <stdlib.h>
 #include <string.h>
@@ -241,6 +242,7 @@ struct db_id* new_db_id(const str* url)
 		LM_ERR("error while parsing database URL: '%.*s' \n", url->len, url->s);
 		goto err;
 	}
+	ptr->pid = my_pid();
 
 	return ptr;
 
@@ -274,6 +276,10 @@ unsigned char cmp_db_id(const struct db_id* id1, const struct db_id* id2)
 	}
 	if (strcasecmp(id1->host, id2->host)) return 0;
 	if (strcmp(id1->database, id2->database)) return 0;
+	if(id1->pid!=id2->pid) {
+		LM_WARN("identical DB URLs, but different DB connection pid\n");
+		return 0;
+	}
 	return 1;
 }
 

lib/srdb1/db_id.h

@@ -40,6 +40,7 @@ struct db_id {
 	char* host;          /**< Host or IP, case insensitive */
 	unsigned short port; /**< Port number */
 	char* database;      /**< Database, case sensitive */
+	int   pid;           /**< Process ID (detect cross connections) */
 };