cdr/cdr_csv.c: Set file name for csv master to the module when (re)loaded.

Compute the location for the csv master file when the module is
loaded or reload.  Before it was calculated every time a log
entry was written.

Change-Id: I3ed9f6a8f965308099db70b71128f43d4d3f5585

cdr/cdr_csv.c

@@ -60,6 +60,7 @@ static int loguserfield = 0;
 static int loaded = 0;
 static int newcdrcolumns = 0;
 static const char config[] = "cdr.conf";
+static char file_csv_master[PATH_MAX];
 
 /* #define CSV_LOGUNIQUEID 1 */
 /* #define CSV_LOGUSERFIELD 1 */
@@ -120,6 +121,12 @@ static int load_config(int reload)
 		return 0;
 	}
 
+	/* compute the location of the csv master file */
+	ast_mutex_lock(&f_lock);
+	snprintf(file_csv_master, sizeof(file_csv_master),
+		"%s/%s/%s", ast_config_AST_LOG_DIR, CSV_LOG_DIR, CSV_MASTER);
+	ast_mutex_unlock(&f_lock);
+
 	for (; v; v = v->next) {
 		if (!strcasecmp(v->name, "usegmtime")) {
 			usegmtime = ast_true(v->value);
@@ -293,16 +300,14 @@ static int csv_log(struct ast_cdr *cdr)
 {
 	/* Make sure we have a big enough buf */
 	char buf[1024];
-	char csvmaster[PATH_MAX];
-	snprintf(csvmaster, sizeof(csvmaster),"%s/%s/%s", ast_config_AST_LOG_DIR, CSV_LOG_DIR, CSV_MASTER);
 	if (build_csv_record(buf, sizeof(buf), cdr)) {
 		ast_log(LOG_WARNING, "Unable to create CSV record in %d bytes.  CDR not recorded!\n", (int)sizeof(buf));
 		return 0;
 	}
 
 	ast_mutex_lock(&f_lock);
-	if (writefile(buf, csvmaster))
-		ast_log(LOG_WARNING, "Unable to write CSV record to master '%s' : %s\n", csvmaster, strerror(errno));
+	if (writefile(buf, file_csv_master))
+		ast_log(LOG_WARNING, "Unable to write CSV record to master '%s' : %s\n", file_csv_master, strerror(errno));
 
 	if (accountlogs && !ast_strlen_zero(cdr->accountcode)) {
 		if (writefile_account(buf, cdr->accountcode))