From 2aa36dd11c5c56c1533c72a04f50d227471cbd8d Mon Sep 17 00:00:00 2001
From: Xavier Arteaga <xavier@softwareradiosystems.com>
Date: Tue, 14 May 2019 13:03:23 +0200
Subject: [PATCH] Added backtrace print helper

---
 lib/include/srslte/common/backtrace.h | 45 +++++++++++++++++++++++++++
 lib/src/common/backtrace.c            | 39 +++++++++++++++++++++++
 lib/src/common/crash_handler.c        | 17 ++--------
 3 files changed, 87 insertions(+), 14 deletions(-)
 create mode 100644 lib/include/srslte/common/backtrace.h
 create mode 100644 lib/src/common/backtrace.c

diff --git a/lib/include/srslte/common/backtrace.h b/lib/include/srslte/common/backtrace.h
new file mode 100644
index 000000000..63537e332
--- /dev/null
+++ b/lib/include/srslte/common/backtrace.h
@@ -0,0 +1,45 @@
+/*
+ * Copyright 2013-2019 Software Radio Systems Limited
+ *
+ * This file is part of srsLTE.
+ *
+ * srsLTE is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of
+ * the License, or (at your option) any later version.
+ *
+ * srsLTE is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * A copy of the GNU Affero General Public License can be found in
+ * the LICENSE file in the top-level directory of this distribution
+ * and at http://www.gnu.org/licenses/.
+ *
+ */
+
+/******************************************************************************
+ *  File:         backtrace.h
+ *
+ *  Description:  print backtrace in runtime.
+ *
+ *  Reference:
+ *****************************************************************************/
+
+#ifndef SRSLTE_BACKTRACE_H
+#define SRSLTE_BACKTRACE_H
+
+#include "srslte/config.h"
+#include <stdio.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif // __cplusplus
+
+SRSLTE_API void srslte_backtrace_print(FILE* f);
+
+#ifdef __cplusplus
+}
+#endif // __cplusplus
+#endif // SRSLTE_BACKTRACE_H
diff --git a/lib/src/common/backtrace.c b/lib/src/common/backtrace.c
new file mode 100644
index 000000000..6d5890b92
--- /dev/null
+++ b/lib/src/common/backtrace.c
@@ -0,0 +1,39 @@
+/*
+ * Copyright 2013-2019 Software Radio Systems Limited
+ *
+ * This file is part of srsLTE.
+ *
+ * srsLTE is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of
+ * the License, or (at your option) any later version.
+ *
+ * srsLTE is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * A copy of the GNU Affero General Public License can be found in
+ * the LICENSE file in the top-level directory of this distribution
+ * and at http://www.gnu.org/licenses/.
+ *
+ */
+#include <execinfo.h>
+#include <stdio.h>
+
+void srslte_backtrace_print(FILE* f)
+{
+  void* array[128] = {};
+  int   size       = 0;
+
+  if (f) {
+    // Get all stack traces
+    size = backtrace(array, 128);
+
+    char** symbols = backtrace_symbols(array, size);
+
+    for (int i = 1; i < size; i++) {
+      fprintf(f, "\t%s\n", symbols[i]);
+    }
+  }
+}
diff --git a/lib/src/common/crash_handler.c b/lib/src/common/crash_handler.c
index 071b95a0c..32a256e63 100644
--- a/lib/src/common/crash_handler.c
+++ b/lib/src/common/crash_handler.c
@@ -21,31 +21,22 @@
 
 #include <pthread.h>
 #include <stdio.h>
-#include <execinfo.h>
 #include <signal.h>
 #include <stdlib.h>
 
-#include "srslte/version.h"
+#include "srslte/common/backtrace.h"
 #include "srslte/common/crash_handler.h"
+#include "srslte/version.h"
 
 const static char crash_file_name[] = "./srsLTE.backtrace.crash";
 static int bt_argc;
 static char **bt_argv;
 
 static void crash_handler(int sig) {
-  void *array[128];
-  int size;
-
-
-  /* Get all stack traces */
-  size = backtrace(array, 128);
-
   FILE *f = fopen(crash_file_name, "a");
   if (!f) {
     printf("srsLTE crashed... we could not save backtrace in '%s'...\n", crash_file_name);
   } else {
-    char **symbols = backtrace_symbols(array, size);
-
     time_t lnTime;
     struct tm *stTime;
     char strdate[32];
@@ -61,9 +52,7 @@ static void crash_handler(int sig) {
     }
     fprintf(f, "' version=%s signal=%d date='%s' ---\n", SRSLTE_VERSION_STRING, sig, strdate);
 
-    for (int i = 0; i < size; i++) {
-      fprintf(f, "\t%s\n", symbols[i]);
-    }
+    srslte_backtrace_print(f);
     fprintf(f, "\n");
 
     printf("srsLTE crashed... backtrace saved in '%s'...\n", crash_file_name);