Fix error if stdout not available.

src/log/ConsoleLog.cpp

@@ -40,7 +40,10 @@
 ConsoleLog::ConsoleLog(bool colors) :
     m_colors(colors)
 {
-    uv_tty_init(uv_default_loop(), &m_tty, 1, 0);
+    if (uv_tty_init(uv_default_loop(), &m_tty, 1, 0) < 0) {
+        return;
+    }
+
     uv_tty_set_mode(&m_tty, UV_TTY_MODE_NORMAL);
 
 #   ifdef WIN32
@@ -58,6 +61,10 @@ ConsoleLog::ConsoleLog(bool colors) :
 
 void ConsoleLog::message(int level, const char* fmt, va_list args)
 {
+    if (!isWritable()) {
+        return;
+    }
+
     time_t now = time(nullptr);
     tm stime;
 
@@ -112,6 +119,10 @@ void ConsoleLog::message(int level, const char* fmt, va_list args)
 
 void ConsoleLog::text(const char* fmt, va_list args)
 {
+    if (!isWritable()) {
+        return;
+    }
+
     char *buf = new char[64 + strlen(fmt) + 2];
 
     sprintf(buf, "%s%s\n", fmt, m_colors ? Log::kCL_N : "");
@@ -120,6 +131,12 @@ void ConsoleLog::text(const char* fmt, va_list args)
 }
 
 
+bool ConsoleLog::isWritable() const
+{
+    return uv_is_writable(reinterpret_cast<const uv_stream_t*>(&m_tty)) == 1 && uv_guess_handle(1) == UV_TTY;
+}
+
+
 void ConsoleLog::print(char *fmt, va_list args)
 {
     vsnprintf(m_buf, sizeof(m_buf) - 1, fmt, args);

src/log/ConsoleLog.h

@@ -40,6 +40,7 @@ public:
     void text(const char *fmt, va_list args) override;
 
 private:
+    bool isWritable() const;
     void print(char *fmt, va_list args);
 
     bool m_colors;