From cdab512c9fceb7cc25c030dd96bbe111bcfe6449 Mon Sep 17 00:00:00 2001
From: Tilghman Lesher <tilghman@meg.abyt.es>
Date: Tue, 27 Dec 2005 06:24:28 +0000
Subject: [PATCH] Bug 5183 - Inline stack backtraces

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@7646 65c4cc65-6c06-0410-ace0-fbb531ad65f3
---
 Makefile                  |  8 ++++++++
 include/asterisk/logger.h |  2 ++
 logger.c                  | 36 ++++++++++++++++++++++++++++++++++++
 3 files changed, 46 insertions(+)

diff --git a/Makefile b/Makefile
index ff3d2abccb..16766d0755 100644
--- a/Makefile
+++ b/Makefile
@@ -45,6 +45,11 @@ ifneq ($(findstring dont-optimize,$(MAKECMDGOALS)),dont-optimize)
 
 #Tell gcc to optimize the code
 OPTIMIZE+=-O6
+else
+  # Stack backtraces, while useful for debugging, are incompatible with optimizations
+  ifeq (${OSARCH},Linux)
+    CFLAGS+=-DSTACK_BACKTRACES
+  endif
 endif
 
 #Overwite config files on "make samples"
@@ -332,7 +337,10 @@ ASTCFLAGS+= $(TRACE_FRAMES)
 ASTCFLAGS+= $(MALLOC_DEBUG)
 ASTCFLAGS+= $(BUSYDETECT)
 ASTCFLAGS+= $(OPTIONS)
+ifneq ($(findstring dont-optimize,$(MAKECMDGOALS)),dont-optimize)
 ASTCFLAGS+= -fomit-frame-pointer 
+endif
+
 SUBDIRS=res channels pbx apps codecs formats agi cdr funcs utils stdtime
 
 OBJS=io.o sched.o logger.o frame.o loader.o config.o channel.o \
diff --git a/include/asterisk/logger.h b/include/asterisk/logger.h
index 863f2881e2..9acec5e75e 100644
--- a/include/asterisk/logger.h
+++ b/include/asterisk/logger.h
@@ -61,6 +61,8 @@ extern "C" {
 extern void ast_log(int level, const char *file, int line, const char *function, const char *fmt, ...)
 	__attribute__ ((format (printf, 5, 6)));
 
+extern void ast_backtrace(void);
+
 extern void ast_queue_log(const char *queuename, const char *callid, const char *agent, const char *event, const char *fmt, ...)
 	__attribute__ ((format (printf, 5, 6)));
 
diff --git a/logger.c b/logger.c
index aae10c604a..66977677da 100644
--- a/logger.c
+++ b/logger.c
@@ -32,6 +32,9 @@
 #include <stdlib.h>
 #include <errno.h>
 #include <sys/stat.h>
+#ifdef STACK_BACKTRACES
+#include <execinfo.h>
+#endif
 
 #define SYSLOG_NAMES /* so we can map syslog facilities names to their numeric values,
 		        from <syslog.h> which is included by logger.h */
@@ -816,6 +819,39 @@ void ast_log(int level, const char *file, int line, const char *function, const
 	}
 }
 
+void ast_backtrace(void)
+{
+#ifdef STACK_BACKTRACES
+	int count=0, i=0;
+	void **addresses;
+	char **strings;
+
+	addresses = calloc(levels, sizeof(void *));
+	if (addresses) {
+		count = backtrace(addresses, 20);
+		strings = backtrace_symbols(addresses, count);
+		if (strings) {
+			ast_log(LOG_WARNING, "Got %d backtrace record%c\n", count, count != 1 ? 's' : ' ');
+			for (i=0; i < count ; i++) {
+				ast_log(LOG_WARNING, "#%d: [%08X] %s\n", i, (unsigned int)addresses[i], strings[i]);
+			}
+			free(strings);
+		} else {
+			ast_log(LOG_WARNING, "Could not allocate memory for backtrace\n");
+		}
+		free(addresses);
+	} else {
+		ast_log(LOG_WARNING, "Could not allocate memory for backtrace\n");
+	}
+#else
+#ifdef Linux
+	ast_log(LOG_WARNING, "Must compile with 'make dont-optimize' for stack backtraces\n");
+#else
+	ast_log(LOG_WARNING, "Inline stack backtraces are only available on the Linux platform.\n");
+#endif
+#endif
+}
+
 void ast_verbose(const char *fmt, ...)
 {
 	static char stuff[4096];