Add method to close output stream and reset to default

configure.ac

@@ -17,6 +17,7 @@ PKG_PROG_PKG_CONFIG
 PKG_INSTALLDIR
 AX_COMPILER_FLAGS
 AX_GCC_FUNC_ATTRIBUTE([constructor])
+AX_GCC_FUNC_ATTRIBUTE([destructor])
 AX_GCC_FUNC_ATTRIBUTE([format])
 
 AC_SUBST([PINELOG_CFLAGS])

pinelog.c

@@ -87,16 +87,25 @@ void pinelog_set_defaults(void)
     log_level = PINELOG_DEFAULT_LEVEL;
 }
 
+#if HAVE_FUNC_ATTRIBUTE_DESTRUCTOR
+__attribute__((destructor))
+#endif
+void pinelog_close_output_stream(void)
+{
+    /* If current output stream is not stdout or stderr, then close it */
+    if (output_stream != NULL && output_stream != stdout && output_stream != stderr) {
+        fclose(output_stream);
+    }
+    output_stream = PINELOG_DEFAULT_STREAM;
+}
+
 int pinelog_set_output_stream(FILE *stream)
 {
     if (stream == NULL) {
         return EINVAL;
     }
 
-    /* If current output stream is not stdout or stderr, then close it */
-    if (output_stream != stdout && output_stream != stderr) {
-        fclose(output_stream);
-    }
+    pinelog_close_output_stream();
 
     setlinebuf(stream);
     output_stream = stream;

pinelog.h

@@ -62,6 +62,11 @@ enum {
  */
 void pinelog_set_defaults(void);
 
+/**
+ * @brief Close the output stream and terminate the logs
+ */
+void pinelog_close_output_stream(void);
+
 #ifdef PINELOG_TEST
 /**
  * @brief Get the pointer to the output stream. Only used in test harness.

test_pinelog.c

@@ -181,7 +181,7 @@ int main(int argc, char **argv)
 
     printf("1..%u\n", test_id);
 
-    fclose(observed_stream_w);
+    pinelog_close_output_stream();
     fclose(observed_stream_r);
     close(fifo_fd_w);
     close(fifo_fd_r);