From c9468bcf8a30d1a4c837814bc34d180f2dff992c Mon Sep 17 00:00:00 2001
From: hrothgar <hrothgar@localhost.(none)>
Date: Thu, 4 Jun 2009 17:26:21 +0000
Subject: [PATCH] initial commit print stack trace

---
 redis.c | 50 +++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 49 insertions(+), 1 deletion(-)

diff --git a/redis.c b/redis.c
index 39d45a2d..a1d3c722 100644
--- a/redis.c
+++ b/redis.c
@@ -36,7 +36,10 @@
 #include <string.h>
 #include <time.h>
 #include <unistd.h>
+#define __USE_POSIX199309
 #include <signal.h>
+#include <execinfo.h>
+#include <ucontext.h>
 #include <sys/wait.h>
 #include <errno.h>
 #include <assert.h>
@@ -51,6 +54,7 @@
 #include <limits.h>
 #include <execinfo.h>
 
+#include "redis.h"
 #include "ae.h"     /* Event driven programming library */
 #include "sds.h"    /* Dynamic safe strings */
 #include "anet.h"   /* Networking the easy way */
@@ -167,6 +171,12 @@
 
 /* Anti-warning macro... */
 #define REDIS_NOTUSED(V) ((void) V)
+int die() {
+        char *err = NULL;
+        sprintf(err, "gonner");
+        return 0;
+}
+
 
 /*================================= Data types ============================== */
 
@@ -1594,7 +1604,8 @@ static robj *createListObject(void) {
 static robj *createSetObject(void) {
     dict *d = dictCreate(&setDictType,NULL);
     if (!d) oom("dictCreate");
-    return createObject(REDIS_SET,d);
+	die();
+return createObject(REDIS_SET,d);
 }
 
 static void freeStringObject(robj *o) {
@@ -4123,7 +4134,44 @@ static void daemonize(void) {
     }
 }
 
+static void segvHandler (int sig, siginfo_t *info, void *secret) {
+
+  void *trace[16];
+  char **messages = (char **)NULL;
+  int i, trace_size = 0;
+  ucontext_t *uc = (ucontext_t *)secret;
+
+  /* Do something useful with siginfo_t */
+  if (sig == SIGSEGV)
+	printf("Got signal %d, faulty address is %p, from %p\n", sig, info->si_addr, 
+		   (void *)uc->uc_mcontext.gregs[REG_EIP]);
+  else
+	printf("Got signal %d\n", sig);
+	
+  trace_size = backtrace(trace, 16);
+  /* overwrite sigaction with caller's address */
+  trace[1] = (void *) uc->uc_mcontext.gregs[REG_EIP];
+
+  messages = backtrace_symbols(trace, trace_size);
+  /* skip first stack frame (points here) */
+  printf("[bt] Execution path:\n");
+  for (i=1; i<trace_size; ++i)
+	printf("[bt] %s\n", messages[i]);
+
+  exit(0);
+}
+
+void setupSigAction(){
+  struct sigaction act;
+  sigemptyset (&act.sa_mask);
+  /* When the SA_SIGINFO flag is set in sa_flags then sa_sigaction  is used. Otherwise, sa_handler is used */
+  act.sa_flags = SA_NODEFER | SA_ONSTACK | SA_RESETHAND | SA_SIGINFO;
+  act.sa_sigaction = segvHandler;
+  sigaction (SIGSEGV, &act, NULL);
+}
+
 int main(int argc, char **argv) {
+	setupSigAction();
 #ifdef __linux__
     linuxOvercommitMemoryWarning();
 #endif
-- 
2.45.2