OTP-5037 Document debug support.

          Debug trace output for connection activity could be enabled
          setting the trace level as an integer to the EI_TRACELEVEL
          environment variable. This option could also be read and set from
          a running program using ei_get_tracelevel(void) and
          ei_set_tracelevel(int).

1 files changed, 19 insertions, 3 deletions

diff --git a/lib/erl_interface/src/connect/ei_connect.c b/lib/erl_interface/src/connect/ei_connect.c
index 9ac5a93c5a..265e133158 100644
--- a/lib/erl_interface/src/connect/ei_connect.c
+++ b/lib/erl_interface/src/connect/ei_connect.c
@@ -97,7 +97,11 @@
 #include "ei_epmd.h"
 #include "ei_internal.h"
 
+#ifdef _REENTRANT
+
+#else
 int ei_tracelevel = 0;
+#endif
 
 #define COOKIE_FILE "/.erlang.cookie"
 #define EI_MAX_HOME_PATH 1024
@@ -249,8 +253,22 @@ ei_cnode *ei_fd_to_cnode(int fd)
     return &sockinfo->cnode;
 }
 
+
+/***************************************************************************
+ *  Get/Set tracelevel
+ ***************************************************************************/
+
+void ei_set_tracelevel(int level) {
+    ei_tracelevel = level;
+}
+
+int ei_get_tracelevel(void) {
+    return ei_tracelevel;
+}
+
+
 /***************************************************************************
- *  XXXX
+ *  Distversion 
  ***************************************************************************/
 
 int ei_distversion(int fd)
@@ -1282,8 +1300,6 @@ error:
     return -1;
 }
 
-/* FIXME fix the signed/unsigned mess..... */
-
 static int send_name_or_challenge(int fd, char *nodename,
 				  int f_chall,
 				  unsigned challenge,