From a52f12cc1879d171ddf309b5ac461bab06c8b5e2 Mon Sep 17 00:00:00 2001
From: Werner Koch <wk@gnupg.org>
Date: Mon, 27 Feb 2017 00:22:26 +0100
Subject: Add a tracing framework.

* src/init.c (trace_save_errno, trace_arg_module)
(trace_arg_file, trace_arg_line): New module vars.
(do_internal_trace): New.
(_gpgrt_internal_trace_printf): New.
(_gpgrt_internal_trace): New.
(_gpgrt_internal_trace_errno): New.
(_gpgrt_internal_trace_end): New.
* src/gpgrt-int.h (trace): New macro.
(trace_errno): New macro.
(trace_start): New macro.
(trace_append): New macro.
(trace_finish): New macro.
--

We want to be abale to use libgpg-error also with pre-c99 compilers
and thus we can use the __VA_ARGS__ but resort to the common macro
trick.
---
 src/init.c | 77 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 77 insertions(+)

(limited to 'src/init.c')

diff --git a/src/init.c b/src/init.c
index f7207fe..e90bec5 100644
--- a/src/init.c
+++ b/src/init.c
@@ -213,6 +213,83 @@ _gpg_err_set_errno (int err)
 }
 
 
+
+/* Internal tracing functions.  We use flockfile and funlockfile to
+ * protect their use. */
+static int trace_save_errno;
+static const char *trace_arg_module;
+static const char *trace_arg_file;
+static int trace_arg_line;
+
+void
+_gpgrt_internal_trace_begin (const char *module, const char *file, int line)
+{
+  int save_errno = errno;
+#ifdef HAVE_FLOCKFILE
+  flockfile (stderr);
+#endif
+  trace_save_errno = save_errno;
+  trace_arg_module = module;
+  trace_arg_file = file;
+  trace_arg_line = line;
+}
+
+
+static void
+do_internal_trace (const char *format, va_list arg_ptr, int with_errno)
+{
+  fprintf (stderr, "%s:%s:%d: ",
+           trace_arg_module, trace_arg_file, trace_arg_line);
+  vfprintf (stderr, format, arg_ptr);
+  if (with_errno)
+    fprintf (stderr, " errno=%s", strerror (trace_save_errno));
+  fputc ('\n', stderr);
+}
+
+void
+_gpgrt_internal_trace_printf (const char *format, ...)
+{
+  va_list arg_ptr;
+
+  va_start (arg_ptr, format) ;
+  vfprintf (stderr, format, arg_ptr);
+  va_end (arg_ptr);
+}
+
+
+void
+_gpgrt_internal_trace (const char *format, ...)
+{
+  va_list arg_ptr;
+
+  va_start (arg_ptr, format) ;
+  do_internal_trace (format, arg_ptr, 0);
+  va_end (arg_ptr);
+}
+
+
+void
+_gpgrt_internal_trace_errno (const char *format, ...)
+{
+  va_list arg_ptr;
+
+  va_start (arg_ptr, format) ;
+  do_internal_trace (format, arg_ptr, 1);
+  va_end (arg_ptr);
+}
+
+
+void
+_gpgrt_internal_trace_end (void)
+{
+  int save_errno = trace_save_errno;
+#ifdef HAVE_FLOCKFILE
+  funlockfile (stderr);
+#endif
+  errno = save_errno;
+}
+
+
 
 #ifdef HAVE_W32_SYSTEM
 /*****************************************
-- 
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