SERVER-7080 Link to backtrace, backtrace_symbols and backtrace_symbols_fd at runtime

Do not make direct calls to backtrace, backtrace_symbols or backtrace_symbols_fd,
which are present in Solaris 11 but not in Solaris 10.  Instead, see if they are
available in a loaded library (which will be libc.so.1) at runtime and either
call them or call an emulation.

8 files changed, 194 insertions, 64 deletions

diff --git a/SConstruct b/SConstruct
index 5fb0e83f492..69a374693bc 100644
--- a/SConstruct
+++ b/SConstruct
@@ -839,7 +839,8 @@ def doConfigure(myenv):
 
     if (conf.CheckCXXHeader( "execinfo.h" ) and
         conf.CheckDeclaration('backtrace', includes='#include <execinfo.h>') and
-        conf.CheckDeclaration('backtrace_symbols', includes='#include <execinfo.h>')):
+        conf.CheckDeclaration('backtrace_symbols', includes='#include <execinfo.h>') and
+        conf.CheckDeclaration('backtrace_symbols_fd', includes='#include <execinfo.h>')):
 
         myenv.Append( CPPDEFINES=[ "MONGO_HAVE_EXECINFO_BACKTRACE" ] )
 
diff --git a/src/SConscript.client b/src/SConscript.client
index 3f4c2ee2936..ff959e95f27 100644
--- a/src/SConscript.client
+++ b/src/SConscript.client
@@ -54,6 +54,7 @@ clientSourceBasic = [
     'mongo/db/namespace.cpp',
     'mongo/db/dbmessage.cpp',
     'mongo/pch.cpp',
+    'mongo/platform/backtrace.cpp',
     'mongo/platform/posix_fadvise.cpp',
     'mongo/platform/random.cpp',
     'mongo/util/assert_util.cpp',
diff --git a/src/mongo/platform/SConscript b/src/mongo/platform/SConscript
index a5db8647c4e..99738b6693a 100644
--- a/src/mongo/platform/SConscript
+++ b/src/mongo/platform/SConscript
@@ -3,6 +3,7 @@
 Import("env")
 
 env.Library('platform', [
+        'backtrace.cpp',
         'posix_fadvise.cpp',
         'random.cpp',
         'strcasestr.cpp',
diff --git a/src/mongo/platform/backtrace.cpp b/src/mongo/platform/backtrace.cpp
new file mode 100644
index 00000000000..9bb3fd0283c
--- /dev/null
+++ b/src/mongo/platform/backtrace.cpp
@@ -0,0 +1,93 @@
+/*    Copyright 2013 10gen Inc.
+ *
+ *    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.
+ */
+
+#if !defined(_WIN32)
+#if defined(__sunos__) || !defined(MONGO_HAVE_EXECINFO_BACKTRACE)
+
+#include "mongo/platform/backtrace.h"
+
+#include <dlfcn.h>
+
+#include "mongo/base/init.h"
+#include "mongo/base/status.h"
+
+namespace mongo {
+namespace pal {
+
+    int backtrace_emulation(void** array, int size) {
+        return 0;
+    }
+
+    char** backtrace_symbols_emulation(void* const* array, int size) {
+        return NULL;
+    }
+
+    void backtrace_symbols_fd_emulation(void* const* array, int size, int fd) {
+    }
+
+    typedef int (*BacktraceFunc)(void** array, int size);
+    static BacktraceFunc backtrace_switcher =
+            pal::backtrace_emulation;
+
+    typedef char** (*BacktraceSymbolsFunc)(void* const* array, int size);
+    static BacktraceSymbolsFunc backtrace_symbols_switcher =
+            pal::backtrace_symbols_emulation;
+
+    typedef void (*BacktraceSymbolsFdFunc)(void* const* array, int size, int fd);
+    static BacktraceSymbolsFdFunc backtrace_symbols_fd_switcher =
+            pal::backtrace_symbols_fd_emulation;
+
+    int backtrace(void** array, int size) {
+        return backtrace_switcher(array, size);
+    }
+
+    char** backtrace_symbols(void* const* array, int size) {
+        return backtrace_symbols_switcher(array, size);
+    }
+
+    void backtrace_symbols_fd(void* const* array, int size, int fd) {
+        backtrace_symbols_fd_switcher(array, size, fd);
+    }
+
+} // namespace pal
+
+    // 'backtrace()', 'backtrace_symbols()' and 'backtrace_symbols_fd()' on Solaris will call
+    // emulation functions if the symbols are not found
+    //
+    MONGO_INITIALIZER_GENERAL(SolarisBacktrace,
+                              MONGO_NO_PREREQUISITES,
+                              ("default"))(InitializerContext* context) {
+        void* functionAddress = dlsym(RTLD_DEFAULT, "backtrace");
+        if (functionAddress != NULL) {
+            pal::backtrace_switcher =
+                    reinterpret_cast<pal::BacktraceFunc>(functionAddress);
+        }
+        functionAddress = dlsym(RTLD_DEFAULT, "backtrace_symbols");
+        if (functionAddress != NULL) {
+            pal::backtrace_symbols_switcher =
+                    reinterpret_cast<pal::BacktraceSymbolsFunc>(functionAddress);
+        }
+        functionAddress = dlsym(RTLD_DEFAULT, "backtrace_symbols_fd");
+        if (functionAddress != NULL) {
+            pal::backtrace_symbols_fd_switcher =
+                    reinterpret_cast<pal::BacktraceSymbolsFdFunc>(functionAddress);
+        }
+        return Status::OK();
+    }
+
+} // namespace mongo
+
+#endif // #if defined(__sunos__)
+#endif // #if !defined(_WIN32)
diff --git a/src/mongo/platform/backtrace.h b/src/mongo/platform/backtrace.h
new file mode 100644
index 00000000000..962cfa43119
--- /dev/null
+++ b/src/mongo/platform/backtrace.h
@@ -0,0 +1,43 @@
+/*    Copyright 2013 10gen Inc.
+ *
+ *    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.
+ */
+
+#pragma once
+
+#if !defined(_WIN32)
+#if defined(__sunos__) || !defined(MONGO_HAVE_EXECINFO_BACKTRACE)
+
+namespace mongo {
+    namespace pal {
+        int backtrace(void** array, int size);
+        char** backtrace_symbols(void* const* array, int size);
+        void backtrace_symbols_fd(void* const* array, int size, int fd);
+    } // namespace pal
+    using pal::backtrace;
+    using pal::backtrace_symbols;
+    using pal::backtrace_symbols_fd;
+} // namespace mongo
+
+#else
+
+#include <execinfo.h>
+
+namespace mongo {
+    using ::backtrace;
+    using ::backtrace_symbols;
+    using ::backtrace_symbols_fd;
+} // namespace mongo
+
+#endif
+#endif
diff --git a/src/mongo/util/signal_handlers.cpp b/src/mongo/util/signal_handlers.cpp
index 52694900448..241d824b1a0 100644
--- a/src/mongo/util/signal_handlers.cpp
+++ b/src/mongo/util/signal_handlers.cpp
@@ -16,7 +16,7 @@
 *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-#include "pch.h"
+#include "mongo/pch.h"
 
 #include <cstdarg>
 #include <cstdio>
@@ -26,20 +26,17 @@
 #include <unistd.h>
 #endif
 
-#ifdef MONGO_HAVE_EXECINFO_BACKTRACE
-#include <execinfo.h>
-#endif
-
-#include "log.h"
-#include "signal_handlers.h"
+#include "mongo/platform/backtrace.h"
+#include "mongo/util/log.h"
+#include "mongo/util/signal_handlers.h"
 
 namespace mongo {
 
     /*
      * WARNING: PLEASE READ BEFORE CHANGING THIS MODULE
      *
-     * All code in this module should be singal-friendly. Before adding any system
-     * call or other dependency, please make sure the latter still holds.
+     * All code in this module must be signal-friendly. Before adding any system
+     * call or other dependency, please make sure that this still holds.
      *
      */
 
@@ -84,7 +81,7 @@ namespace mongo {
 
     static void formattedBacktrace( int fd ) {
 
-#ifdef MONGO_HAVE_EXECINFO_BACKTRACE
+#if !defined(_WIN32)
 
         int numFrames;
         const int MAX_DEPTH = 20;
diff --git a/src/mongo/util/stack_introspect.cpp b/src/mongo/util/stack_introspect.cpp
index 27ebb0267cf..ce69b988bb7 100644
--- a/src/mongo/util/stack_introspect.cpp
+++ b/src/mongo/util/stack_introspect.cpp
@@ -18,22 +18,21 @@
 
 #include "mongo/util/stack_introspect.h"
 
+#if !defined(_WIN32)
+
 #include <cstdlib>
+#include <cxxabi.h>
 #include <iostream>
-#include <string>
 #include <map>
+#include <string>
 #include <vector>
 
+#include "mongo/platform/backtrace.h"
 #include "mongo/util/concurrency/mutex.h"
 #include "mongo/util/text.h"
 
 using namespace std;
 
-#ifdef MONGO_HAVE_EXECINFO_BACKTRACE
-
-#include <execinfo.h>
-#include <cxxabi.h>
-
 namespace mongo {
     
     namespace {
@@ -106,7 +105,7 @@ namespace mongo {
     
     bool inConstructorChain( bool printOffending ){
         void* b[maxBackTraceFrames];
-        int size = ::backtrace( b, maxBackTraceFrames );
+        int size = backtrace( b, maxBackTraceFrames );
 
         char** strings = 0;
         
@@ -122,7 +121,7 @@ namespace mongo {
             }
 
             if ( ! strings ) 
-                strings = ::backtrace_symbols( b, size );
+                strings = backtrace_symbols( b, size );
 
             string symbol = strings[i];
 
@@ -176,5 +175,4 @@ namespace mongo {
     bool inConstructorChainSupported() { return false; }
 }
 
-#endif  // defined(MONGO_HAVE_EXECINFO_BACKTRACE)
-
+#endif  // #if !defined(_WIN32)
diff --git a/src/mongo/util/stacktrace.cpp b/src/mongo/util/stacktrace.cpp
index ab405c9a717..37783fc0ef4 100644
--- a/src/mongo/util/stacktrace.cpp
+++ b/src/mongo/util/stacktrace.cpp
@@ -11,53 +11,18 @@
 #include "mongo/util/log.h"
 
 #ifdef _WIN32
-#include <sstream>
-#include <stdio.h>
 #include <boost/filesystem/operations.hpp>
 #include <boost/smart_ptr/scoped_array.hpp>
+#include <sstream>
+#include <stdio.h>
 #include "mongo/platform/windows_basic.h"
 #include <DbgHelp.h>
 #include "mongo/util/assert_util.h"
+#else
+#include "mongo/platform/backtrace.h"
 #endif
 
-#ifdef MONGO_HAVE_EXECINFO_BACKTRACE
-
-#include <execinfo.h>
-
-namespace mongo {
-    static const int maxBackTraceFrames = 20;
-
-    /**
-     * Print a stack backtrace for the current thread to the specified ostream.
-     * 
-     * @param os    ostream& to receive printed stack backtrace
-     */
-    void printStackTrace( std::ostream& os ) {
-        
-        void *b[maxBackTraceFrames];
-        
-        int size = ::backtrace( b, maxBackTraceFrames );
-        for ( int i = 0; i < size; i++ )
-            os << std::hex << b[i] << std::dec << ' ';
-        os << std::endl;
-        
-        char **strings;
-        
-        strings = ::backtrace_symbols( b, size );
-        if (strings == NULL) {
-            const int err = errno;
-            os << "Unable to collect backtrace symbols (" << errnoWithDescription(err) << ")"
-               << std::endl;
-            return;
-        }
-        for ( int i = 0; i < size; i++ )
-            os << ' ' << strings[i] << '\n';
-        os.flush();
-        ::free( strings );
-    }
-}
-
-#elif defined(_WIN32)
+#if defined(_WIN32)
 
 namespace mongo {
 
@@ -306,12 +271,43 @@ namespace mongo {
     }
 
 }
-
 #else
 
 namespace mongo {
-    void printStackTrace( std::ostream &os ) {}
+    static const int maxBackTraceFrames = 20;
+
+    /**
+     * Print a stack backtrace for the current thread to the specified ostream.
+     * 
+     * @param os    ostream& to receive printed stack backtrace
+     */
+    void printStackTrace( std::ostream& os ) {
+
+        void* addresses[maxBackTraceFrames];
+
+        int addressCount = backtrace(addresses, maxBackTraceFrames);
+        if (addressCount == 0) {
+            const int err = errno;
+            os << "Unable to collect backtrace addresses (" << errnoWithDescription(err) << ")"
+               << std::endl;
+            return;
+        }
+        for (int i = 0; i < addressCount; i++)
+            os << std::hex << addresses[i] << std::dec << ' ';
+        os << std::endl;
+
+        char** backtraceStrings = backtrace_symbols(addresses, addressCount);
+        if (backtraceStrings == NULL) {
+            const int err = errno;
+            os << "Unable to collect backtrace symbols (" << errnoWithDescription(err) << ")"
+               << std::endl;
+            return;
+        }
+        for (int i = 0; i < addressCount; i++)
+            os << ' ' << backtraceStrings[i] << '\n';
+        os.flush();
+        free(backtraceStrings);
+    }
 }
 
 #endif
-