From f6656c88c4beefb963798afbd6a40d59a6164952 Mon Sep 17 00:00:00 2001
From: Mathias Stearn <mathias@10gen.com>
Date: Fri, 6 Mar 2015 15:22:24 -0500
Subject: Fix launchGDBServer() compile and make more signal safe

---
 src/mongo/util/debugger.cpp | 28 +++++++++++++++++-----------
 1 file changed, 17 insertions(+), 11 deletions(-)

(limited to 'src/mongo/util/debugger.cpp')

diff --git a/src/mongo/util/debugger.cpp b/src/mongo/util/debugger.cpp
index 03f8dfa7c24..13be663a955 100644
--- a/src/mongo/util/debugger.cpp
+++ b/src/mongo/util/debugger.cpp
@@ -31,8 +31,6 @@
 
 #include "mongo/util/debugger.h"
 
-#include <iostream>
-
 #include "mongo/db/server_options.h"
 #include "mongo/util/debug_util.h"
 
@@ -40,10 +38,6 @@
 #include <signal.h>
 #endif
 
-#if defined(USE_GDBSERVER)
-#include "mongo/db/jsobj.h"
-#endif  // defined(USE_GDBSERVER)
-
 namespace mongo {
     void breakpoint() {
 #ifdef _WIN32
@@ -77,15 +71,27 @@ namespace mongo {
         // Don't come back here
         signal(SIGTRAP, SIG_IGN);
 
-        int newPort = serverGlobalParams.port + 2000;
-        string newPortStr = "localhost:" + BSONObjBuilder::numStr(newPort);
-        string pidToDebug = BSONObjBuilder::numStr(getpid());
+        const int newPort = serverGlobalParams.port + 2000;
+
+        char pidToDebug[16];
+        int pidRet = snprintf(pidToDebug, sizeof(pidToDebug), "%d", getpid());
+        invariant(pidRet >= 0 && size_t(pidRet) < sizeof(pidToDebug));
+
+        char hostPort[32];
+        int hostRet = snprintf(hostPort, sizeof(hostPort), "localhost:%d", newPort);
+        invariant(hostRet >= 0 && size_t(hostRet) < sizeof(hostPort));
+
+        char msg[128];
+        int msgRet = snprintf(msg, sizeof(msg),
+                              "\n\n\t**** Launching gdbserver on %s ****\n\n", hostPort);
+        invariant(msgRet >= 0 && size_t(msgRet) < sizeof(msg));
+        invariant(write(STDERR_FILENO, msg, msgRet) == msgRet);
 
-        cout << "\n\n\t**** Launching gdbserver on " << newPortStr << " ****" << endl << endl;
         if (fork() == 0) {
             //child
-            execlp("gdbserver", "gdbserver", "--attach", newPortStr.c_str(), pidToDebug.c_str(), NULL);
+            execlp("gdbserver", "gdbserver", "--attach", hostPort, pidToDebug, NULL);
             perror(NULL);
+            _exit(1);
         }
         else {
             //parent
-- 
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