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// debug_util.cpp
/* Copyright 2009 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.
*/
#include "pch.h"
#ifndef _WIN32
#include <signal.h>
#endif
#if defined(USE_GDBSERVER)
#include "mongo/db/cmdline.h"
#include "mongo/db/jsobj.h"
#endif // defined(USE_GDBSERVER)
namespace mongo {
void mongo_breakpoint() {
#ifdef _WIN32
DEV DebugBreak();
#endif
#ifndef _WIN32
// code to raise a breakpoint in GDB
ONCE {
//prevent SIGTRAP from crashing the program if default action is specified and we are not in gdb
struct sigaction current;
sigaction(SIGTRAP, NULL, ¤t);
if (current.sa_handler == SIG_DFL) {
signal(SIGTRAP, SIG_IGN);
}
}
raise(SIGTRAP);
#endif
}
#if defined(USE_GDBSERVER)
/* Magic gdb trampoline
* Do not call directly! call setupSIGTRAPforGDB()
* Assumptions:
* 1) gdbserver is on your path
* 2) You have run "handle SIGSTOP noprint" in gdb
* 3) cmdLine.port + 2000 is free
*/
void launchGDB(int) {
// Don't come back here
signal(SIGTRAP, SIG_IGN);
int newPort = cmdLine.port + 2000;
string newPortStr = "localhost:" + BSONObjBuilder::numStr(newPort);
string pidToDebug = BSONObjBuilder::numStr(getpid());
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);
perror(NULL);
}
else {
//parent
raise(SIGSTOP); // pause all threads until gdb connects and continues
raise(SIGTRAP); // break inside gdbserver
}
}
void setupSIGTRAPforGDB() {
verify( signal(SIGTRAP , launchGDB ) != SIG_ERR );
}
#else
void setupSIGTRAPforGDB() {
}
#endif
}
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