From 3d972da1e68ff950eeb84fd9345a487d71925560 Mon Sep 17 00:00:00 2001
From: Arseny Smirnov <arseny30@gmail.com>
Date: Wed, 14 Aug 2019 11:31:25 +0300
Subject: [PATCH] Stacktrace improvements.

GitOrigin-RevId: 99dd952cff5c9e5edce575b84e365def24a59441
---
 tdutils/td/utils/port/signals.cpp    | 1 +
 tdutils/td/utils/port/stacktrace.cpp | 7 +++++++
 tdutils/td/utils/port/stacktrace.h   | 2 ++
 3 files changed, 10 insertions(+)

diff --git a/tdutils/td/utils/port/signals.cpp b/tdutils/td/utils/port/signals.cpp
index 03e823934..4fcf34b82 100644
--- a/tdutils/td/utils/port/signals.cpp
+++ b/tdutils/td/utils/port/signals.cpp
@@ -306,6 +306,7 @@ static void block_stdin() {
 }
 
 static void default_failure_signal_handler(int sig) {
+  Stacktrace::init();
   signal_safe_write_signal_number(sig);
 
   Stacktrace::PrintOptions options;
diff --git a/tdutils/td/utils/port/stacktrace.cpp b/tdutils/td/utils/port/stacktrace.cpp
index 18f0e372f..384b2d0f6 100644
--- a/tdutils/td/utils/port/stacktrace.cpp
+++ b/tdutils/td/utils/port/stacktrace.cpp
@@ -114,4 +114,11 @@ void Stacktrace::print_to_stderr(const PrintOptions &options) {
   print_backtrace();
 }
 
+void Stacktrace::init() {
+#if __GLIBC__
+  void *buffer[1];
+  backtrace(buffer, 1);
+#endif
+}
+
 }  // namespace td
diff --git a/tdutils/td/utils/port/stacktrace.h b/tdutils/td/utils/port/stacktrace.h
index fbc4e78f4..5a16ec01f 100644
--- a/tdutils/td/utils/port/stacktrace.h
+++ b/tdutils/td/utils/port/stacktrace.h
@@ -16,6 +16,8 @@ class Stacktrace {
     }
   };
   static void print_to_stderr(const PrintOptions &options = PrintOptions());
+  // backtrace needs to be called once to ensure that next calls are async-signal-safe
+  static void init();
 };
 
 }  // namespace td