bool DebuggerCommand::Receive(DebuggerThriftBuffer &thrift,
DebuggerCommandPtr &cmd, const char *caller) {
cmd.reset();
struct pollfd fds[1];
fds[0].fd = thrift.getSocket()->fd();
fds[0].events = POLLIN|POLLERR|POLLHUP;
int ret = poll(fds, 1, POLLING_SECONDS * 1000);
if (ret == 0) {
return false;
}
if (ret == -1 || !(fds[0].revents & POLLIN)) {
return errno != EINTR; // treat signals as timeouts
}
int32 type;
string clsname;
try {
thrift.reset(true);
thrift.read(type);
thrift.read(clsname);
} catch (...) {
Logger::Verbose("%s => DebuggerCommand::Receive(): socket error", caller);
return true;
}
// not all commands are here, as not all commands need to be sent over wire
switch (type) {
case KindOfBreak : cmd = DebuggerCommandPtr(new CmdBreak ()); break;
case KindOfContinue : cmd = DebuggerCommandPtr(new CmdContinue ()); break;
case KindOfDown : cmd = DebuggerCommandPtr(new CmdDown ()); break;
case KindOfException: cmd = DebuggerCommandPtr(new CmdException()); break;
case KindOfFrame : cmd = DebuggerCommandPtr(new CmdFrame ()); break;
case KindOfGlobal : cmd = DebuggerCommandPtr(new CmdGlobal ()); break;
case KindOfInfo : cmd = DebuggerCommandPtr(new CmdInfo ()); break;
case KindOfJump : cmd = DebuggerCommandPtr(new CmdJump ()); break;
case KindOfConstant : cmd = DebuggerCommandPtr(new CmdConstant ()); break;
case KindOfList : cmd = DebuggerCommandPtr(new CmdList ()); break;
case KindOfMachine : cmd = DebuggerCommandPtr(new CmdMachine ()); break;
case KindOfNext : cmd = DebuggerCommandPtr(new CmdNext ()); break;
case KindOfOut : cmd = DebuggerCommandPtr(new CmdOut ()); break;
case KindOfPrint : cmd = DebuggerCommandPtr(new CmdPrint ()); break;
case KindOfQuit : cmd = DebuggerCommandPtr(new CmdQuit ()); break;
case KindOfRun : cmd = DebuggerCommandPtr(new CmdRun ()); break;
case KindOfStep : cmd = DebuggerCommandPtr(new CmdStep ()); break;
case KindOfThread : cmd = DebuggerCommandPtr(new CmdThread ()); break;
case KindOfUp : cmd = DebuggerCommandPtr(new CmdUp ()); break;
case KindOfVariable : cmd = DebuggerCommandPtr(new CmdVariable ()); break;
case KindOfWhere : cmd = DebuggerCommandPtr(new CmdWhere ()); break;
case KindOfUser : cmd = DebuggerCommandPtr(new CmdUser ()); break;
case KindOfEval : cmd = DebuggerCommandPtr(new CmdEval ()); break;
case KindOfInterrupt: cmd = DebuggerCommandPtr(new CmdInterrupt()); break;
case KindOfSignal : cmd = DebuggerCommandPtr(new CmdSignal ()); break;
case KindOfShell : cmd = DebuggerCommandPtr(new CmdShell ()); break;
case KindOfExtended: {
ASSERT(!clsname.empty());
cmd = CmdExtended::CreateExtendedCommand(clsname);
ASSERT(cmd);
break;
}
default:
ASSERT(false);
Logger::Error("%s => DebuggerCommand::Receive(): bad cmd type: %d",
caller, type);
return true;
}
if (!cmd->recv(thrift)) {
cmd.reset();
}
return true;
}
// Returns false on timeout, true when data has been read even if that data
// didn't form a usable command. Is there is no usable command, cmd is null.
bool DebuggerCommand::Receive(DebuggerThriftBuffer &thrift,
DebuggerCommandPtr &cmd, const char *caller) {
TRACE(5, "DebuggerCommand::Receive\n");
cmd.reset();
struct pollfd fds[1];
fds[0].fd = thrift.getSocket()->fd();
fds[0].events = POLLIN|POLLERR|POLLHUP;
int ret = poll(fds, 1, POLLING_SECONDS * 1000);
if (ret == 0) return false; // Timeout
if (ret == -1) {
auto errorNumber = errno; // Just in case TRACE_RB changes errno
TRACE_RB(1, "DebuggerCommand::Receive: error %d\n", errorNumber);
return errorNumber != EINTR; // Treat signals as timeouts
}
// If we don't have any data to read (POLLIN) then we're done. If we
// do have data we'll attempt to read and decode it below, even if
// there are other error bits set.
if (!(fds[0].revents & POLLIN)) {
TRACE_RB(1, "DebuggerCommand::Receive: revents %d\n", fds[0].revents);
return true;
}
int32_t type;
std::string clsname;
try {
thrift.reset(true);
thrift.read(type);
thrift.read(clsname);
} catch (...) {
// Note: this error case is difficult to test. But, it's exactly the same
// as the error noted below. Make sure to keep handling of both of these
// errors in sync.
TRACE_RB(1, "%s: socket error receiving command", caller);
return true;
}
TRACE(1, "DebuggerCommand::Receive: got cmd of type %d\n", type);
// not all commands are here, as not all commands need to be sent over wire
switch (type) {
case KindOfBreak : cmd = DebuggerCommandPtr(new CmdBreak ()); break;
case KindOfContinue : cmd = DebuggerCommandPtr(new CmdContinue ()); break;
case KindOfDown : cmd = DebuggerCommandPtr(new CmdDown ()); break;
case KindOfException: cmd = DebuggerCommandPtr(new CmdException()); break;
case KindOfFrame : cmd = DebuggerCommandPtr(new CmdFrame ()); break;
case KindOfGlobal : cmd = DebuggerCommandPtr(new CmdGlobal ()); break;
case KindOfInfo : cmd = DebuggerCommandPtr(new CmdInfo ()); break;
case KindOfConstant : cmd = DebuggerCommandPtr(new CmdConstant ()); break;
case KindOfList : cmd = DebuggerCommandPtr(new CmdList ()); break;
case KindOfMachine : cmd = DebuggerCommandPtr(new CmdMachine ()); break;
case KindOfNext : cmd = DebuggerCommandPtr(new CmdNext ()); break;
case KindOfOut : cmd = DebuggerCommandPtr(new CmdOut ()); break;
case KindOfPrint : cmd = DebuggerCommandPtr(new CmdPrint ()); break;
case KindOfQuit : cmd = DebuggerCommandPtr(new CmdQuit ()); break;
case KindOfRun : cmd = DebuggerCommandPtr(new CmdRun ()); break;
case KindOfStep : cmd = DebuggerCommandPtr(new CmdStep ()); break;
case KindOfThread : cmd = DebuggerCommandPtr(new CmdThread ()); break;
case KindOfUp : cmd = DebuggerCommandPtr(new CmdUp ()); break;
case KindOfVariable : cmd = DebuggerCommandPtr(new CmdVariable ()); break;
case KindOfVariableAsync :
cmd = DebuggerCommandPtr(new CmdVariable (KindOfVariableAsync)); break;
case KindOfWhere : cmd = DebuggerCommandPtr(new CmdWhere ()); break;
case KindOfWhereAsync:
cmd = DebuggerCommandPtr(new CmdWhere(KindOfWhereAsync)); break;
case KindOfEval : cmd = DebuggerCommandPtr(new CmdEval ()); break;
case KindOfInterrupt: cmd = DebuggerCommandPtr(new CmdInterrupt()); break;
case KindOfSignal : cmd = DebuggerCommandPtr(new CmdSignal ()); break;
case KindOfShell : cmd = DebuggerCommandPtr(new CmdShell ()); break;
case KindOfInternalTesting :
cmd = DebuggerCommandPtr(new CmdInternalTesting()); break;
case KindOfExtended: {
assert(!clsname.empty());
cmd = CmdExtended::CreateExtendedCommand(clsname);
assert(cmd);
break;
}
default:
TRACE_RB(1, "%s: received bad cmd type: %d", caller, type);
cmd.reset();
return true;
}
if (!cmd->recv(thrift)) {
// Note: this error case is easily tested, and we have a test for it. But
// the error case noted above is quite difficult to test. Keep these two
// in sync.
TRACE_RB(1, "%s: socket error receiving command", caller);
cmd.reset();
}
return true;
}