afb-debug: add features for debugging

[src/app-framework-binder.git] / src / afb-debug.c

diff --git a/src/afb-debug.c b/src/afb-debug.c
new file mode 100644 (file)
index 0000000..5817f17
--- /dev/null
+++ b/src/afb-debug.c
@@ -0,0 +1,86 @@
+/*
+ Copyright 2017 IoT.bzh
+
+ author: José Bollo <jose.bollo@iot.bzh>
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+     http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+*/
+
+#include "afb-debug.h"
+
+#if defined(AFB_INSERT_DEBUG_FEATURES)
+
+#define _GNU_SOURCE
+#include <stdlib.h>
+#include <string.h>
+#include <signal.h>
+
+#include "verbose.h"
+
+static char key_env_break[] = "AFB_DEBUG_BREAK";
+static char key_env_wait[] = "AFB_DEBUG_WAIT";
+static char separs[] = ", \t\n";
+
+static int has_key(const char *key, const char *list)
+{
+       if (list && key) {
+               list += strspn(list, separs);
+               while (*list) {
+                       size_t s = strcspn(list, separs);
+                       if (!strncasecmp(list, key, s) && !key[s])
+                               return 1;
+                       list += s;
+                       list += strspn(list, separs);
+               }
+       }
+       return 0;
+}
+
+static void handler(int signum)
+{
+}
+
+void afb_debug(const char *key)
+{
+       enum { None, Break, Wait } action;
+
+       if (has_key(key, secure_getenv(key_env_break)))
+               action = Break;
+       else if (has_key(key, secure_getenv(key_env_wait)))
+               action = Wait;
+       else
+               action = None;
+
+       if (action != None) {
+               const char *a = action == Break ? "BREAK" : "WAIT";
+               struct sigaction sa, psa;
+               sigset_t ss;
+
+               NOTICE("DEBUG %s before %s", a, key);
+               memset(&sa, 0, sizeof sa);
+               sa.sa_handler = handler;
+               sigaction(SIGINT, &sa, &psa);
+               if (action == Break) {
+                       raise(SIGINT);
+               } else {
+                       sigemptyset(&ss);
+                       sigaddset(&ss, SIGINT);
+                       sigwaitinfo(&ss, NULL);
+               }
+               sigaction(SIGINT, &psa, NULL);
+               NOTICE("DEBUG %s after %s", a, key);
+       }
+}
+
+#endif
+