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wmbusmeters/src/serial.cc

1643 wiersze
43 KiB
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Czysty Wina Historia

/*
Copyright (C) 2017-2020 Fredrik Öhrström
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include"util.h"
#include"rtlsdr.h"
#include"serial.h"
#include"shell.h"
#include"threads.h"
#include"timings.h"
#include <algorithm>
#include <assert.h>
#include <dirent.h>
#include <fcntl.h>
#include <functional>
#include <libgen.h>
#include <memory.h>
#include <pthread.h>
#include <sys/file.h>
#include <sys/ioctl.h>
#include <sys/select.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <termios.h>
#include <unistd.h>
#if defined(__linux__)
#include <linux/serial.h>
#endif
// return a positive integer (file descriptor) on success.
// return -1 for failure to open. return -2 for already locked.
static int openSerialTTY(const char *tty, int baud_rate, PARITY parity);
static string showTTYSettings(int fd);
struct SerialDeviceImp;
struct SerialDeviceTTY;
struct SerialDeviceCommand;
struct SerialDeviceFile;
struct SerialDeviceSimulator;
struct Timer
{
int id;
int seconds;
time_t last_call;
function<void()> callback;
string name;
bool isTime(time_t now)
{
return (last_call+seconds) <= now;
}
};
struct SerialCommunicationManagerImp : public SerialCommunicationManager
{
SerialCommunicationManagerImp(time_t exit_after_seconds, bool start_event_loop);
~SerialCommunicationManagerImp();
shared_ptr<SerialDevice> createSerialDeviceTTY(string dev, int baud_rate, PARITY parity, string purpose);
shared_ptr<SerialDevice> createSerialDeviceCommand(string identifier, string command, vector<string> args,
vector<string> envs, string purpose);
shared_ptr<SerialDevice> createSerialDeviceFile(string file, string purpose);
shared_ptr<SerialDevice> createSerialDeviceSimulator();
void listenTo(SerialDevice *sd, function<void()> cb);
void onDisappear(SerialDevice *sd, function<void()> cb);
void expectDevicesToWork();
void stop();
void startEventLoop();
void waitForStop();
bool isRunning();
shared_ptr<SerialDevice> addSerialDeviceForManagement(SerialDevice *sd);
void tickleEventLoop();
void removeNonWorkingSerialDevices();
void closeAllDoNotRemove();
int startRegularCallback(string name, int seconds, function<void()> callback);
void stopRegularCallback(int id);
AccessCheck checkAccess(string device,
shared_ptr<SerialCommunicationManager> manager,
string extra_info,
function<AccessCheck(string,shared_ptr<SerialCommunicationManager>)> extra_probe);
vector<string> listSerialTTYs();
shared_ptr<SerialDevice> lookup(std::string device);
bool removeNonWorking(std::string device);
private:
void *eventLoop();
void *timerLoop();
void executeTimerCallbacks();
time_t calculateTimeToNearestTimerCallback(time_t now);
bool running_ {};
bool expect_devices_to_work_ {}; // false during detection phase, true when running.
time_t start_time_ {};
time_t exit_after_seconds_ {};
vector<shared_ptr<SerialDevice>> serial_devices_;
RecursiveMutex serial_devices_mutex_ = { "serial_devices_mutex" };
#define LOCK_SERIAL_DEVICES(where) WITH(serial_devices_mutex_, serial_devices_mutex, where)
RecursiveMutex event_loop_mutex_ = {"event_loop_mutex" };
#define LOCK_EVENT_LOOP(where) WITH(event_loop_mutex_, event_loop_mutex, where)
vector<Timer> timers_; // Protected by LOCK_TIMERS
RecursiveMutex timers_mutex_ = { "timers_mutex" };
#define LOCK_TIMERS(where) WITH(timers_mutex_, timers_mutex, where)
};
SerialCommunicationManagerImp::~SerialCommunicationManagerImp()
{
// Stop the loop.
stop();
// Grab the event_loop_lock. This can only be done when the eventLoop has stopped running.
event_loop_mutex_.lock();
// Close all managed devices (not yet closed)
closeAllDoNotRemove();
// Remove all closed devices.
removeNonWorkingSerialDevices();
// Now we can be sure the eventLoop has stopped and it is safe to
// free this Manager object.
}
struct SerialDeviceImp : public SerialDevice
{
void disableCallbacks() { no_callbacks_ = true; }
void enableCallbacks() { no_callbacks_ = false; }
bool skippingCallbacks() { return no_callbacks_; }
void fill(vector<uchar> &data) {};
int receive(vector<uchar> *data);
bool waitFor(uchar c);
bool working() { return resetting_ || fd_ != -1; }
bool resetting() { return resetting_; }
bool opened() { return resetting_ || fd_ != -2; }
bool isClosed() { return fd_ == -1 && !resetting_; }
bool readonly() { return is_stdin_ || is_file_; }
void expectAscii() { expecting_ascii_ = true; }
void setIsFile() { is_file_ = true; }
void setIsStdin() { is_stdin_ = true; }
string device() { return ""; }
int fd() { return fd_; }
SerialCommunicationManager *manager() { return manager_; }
void resetInitiated() { debug("(serial) initiate reset\n"); resetting_ = true; }
void resetCompleted() { debug("(serial) reset completed\n"); resetting_ = false; }
bool checkIfDataIsPending()
{
if (!opened() || !working()) return false; // No data can be pending if device is not opened nor working.
int available = -1;
int rc = ioctl(fd_, FIONREAD, &available);
if (rc == -1) return false;
return available > 0;
}
SerialDeviceImp(SerialCommunicationManagerImp *manager, string purpose)
{
manager_ = manager;
purpose_ = purpose;
}
~SerialDeviceImp() = default;
protected:
RecursiveMutex read_mutex_ = { "read_mutex" };
#define LOCK_READ_SERIAL(where) WITH(read_mutex_, read_mutex, where)
RecursiveMutex write_mutex_ = { "write_mutex" };
#define LOCK_WRITE_SERIAL(where) WITH(write_mutex_, write_mutex, where)
function<void()> on_data_;
function<void()> on_disappear_;
int fd_ = -2; // -2 not yet opened, -1 not working
bool expecting_ascii_ {}; // If true, print using safeString instead if bin2hex
bool is_file_ = false;
bool is_stdin_ = false;
// When feeding from stdin, to prevent early exit, we want
// at least some data before leaving the loop!
// I.e. do not exit before we have received something!
bool no_callbacks_ = false;
SerialCommunicationManagerImp *manager_;
bool resetting_ {}; // Set to true while resetting.
string purpose_; // Can be set to identify a serial device purose.
friend struct SerialCommunicationManagerImp;
};
bool SerialDeviceImp::waitFor(uchar c)
{
vector<uchar> data;
for (;;)
{
int n = receive(&data);
if (n == 0) break;
if (data.back() == c) return true;
}
return false;
}
int SerialDeviceImp::receive(vector<uchar> *data)
{
LOCK_READ_SERIAL(receive);
bool close_me = false;
data->clear();
int num_read = 0;
while (true)
{
data->resize(num_read+1024);
int nr = read(fd_, &((*data)[num_read]), 1024);
if (nr > 0)
{
num_read += nr;
}
if (nr == 0)
{
if (is_file_)
{
debug("(serial) no more data on file fd=%d\n", fd_);
close_me = true;
}
if (is_stdin_)
{
if (getchar() == EOF)
{
debug("(serial) no more data on stdin fd=%d\n", fd_);
close_me = true;
}
}
break;
}
if (nr < 0)
{
if (errno == EINTR && fd_ != -1) continue; // Interrupted try again.
if (errno == EAGAIN) break; // No more data available since it would block.
if (errno == EBADF)
{
debug("(serial) got EBADF for fd=%d closing it.\n", fd_);
close_me = true;
break;
}
break;
}
}
data->resize(num_read);
if (isDebugEnabled())
{
if (expecting_ascii_)
{
string msg = safeString(*data);
debug("(serial) received ascii \"%s\"\n", msg.c_str());
}
else
{
string msg = bin2hex(*data);
debug("(serial) received binary \"%s\"\n", msg.c_str());
}
}
if (close_me) close();
return num_read;
}
struct SerialDeviceTTY : public SerialDeviceImp
{
SerialDeviceTTY(string device, int baud_rate, PARITY parity, SerialCommunicationManagerImp * manager, string purpose);
~SerialDeviceTTY();
bool open(bool fail_if_not_ok);
void close();
bool send(vector<uchar> &data);
bool working();
string device() { return device_; }
private:
string device_;
int baud_rate_ {};
PARITY parity_ {};
};
SerialDeviceTTY::SerialDeviceTTY(string device, int baud_rate, PARITY parity,
SerialCommunicationManagerImp *manager,
string purpose)
: SerialDeviceImp(manager, purpose)
{
device_ = device;
baud_rate_ = baud_rate;
parity_ = parity;
}
SerialDeviceTTY::~SerialDeviceTTY()
{
close();
}
bool SerialDeviceTTY::open(bool fail_if_not_ok)
{
assert(device_ != "");
bool ok = checkCharacterDeviceExists(device_.c_str(), fail_if_not_ok);
if (!ok) return false;
fd_ = openSerialTTY(device_.c_str(), baud_rate_, parity_);
if (fd_ == -1)
{
if (fail_if_not_ok) error("Could not open %s with %d baud N81\n", device_.c_str(), baud_rate_);
verbose("(serialtty) could not open %s with %d baud N81\n", device_.c_str(), baud_rate_);
return false;
}
if (fd_ == -2)
{
if (fail_if_not_ok) error("Device %s is already in use and locked.\n", device_.c_str());
verbose("(serialtty) device %s is already in use and locked.\n", device_.c_str());
return false;
}
verbose("(serialtty) opened %s fd %d (%s)\n", device_.c_str(), fd_, purpose_.c_str());
return true;
}
void SerialDeviceTTY::close()
{
if (fd_ == -1) return;
::flock(fd_, LOCK_UN);
::close(fd_);
fd_ = -1;
if (on_disappear_ && !resetting_)
{
on_disappear_();
on_disappear_ = NULL;
}
manager_->tickleEventLoop();
verbose("(serialtty) closed %s (%s)\n", device_.c_str(), purpose_.c_str());
}
bool SerialDeviceTTY::send(vector<uchar> &data)
{
LOCK_WRITE_SERIAL(send);
assert(data.size() > 0);
bool rc = true;
int n = data.size();
int written = 0;
while (true)
{
int nw = write(fd_, &data[written], n-written);
if (nw > 0) written += nw;
if (nw < 0)
{
if (errno==EINTR) continue;
rc = false;
if (isDebugEnabled()) {
string msg = bin2hex(data);
debug("(serial %s) failed to send \"%s\"\n", device_.c_str(), msg.c_str());
}
goto end;
}
if (written == n) break;
}
if (isDebugEnabled()) {
string msg = bin2hex(data);
debug("(serial %s) sent \"%s\"\n", device_.c_str(), msg.c_str());
}
if (signalsInstalled())
{
if (getEventLoopThread()) pthread_kill(getEventLoopThread(), SIGUSR1);
}
end:
return rc;
}
bool SerialDeviceTTY::working()
{
if (resetting_) return true;
if (fd_ == -1) return false;
bool working = checkCharacterDeviceExists(device_.c_str(), false);
if (!working) {
debug("(serial) device %s is gone\n", device_.c_str());
}
return working;
}
struct SerialDeviceCommand : public SerialDeviceImp
{
SerialDeviceCommand(string identifier, string command, vector<string> args, vector<string> envs,
SerialCommunicationManagerImp *manager,
string purpose);
~SerialDeviceCommand();
bool open(bool fail_if_not_ok);
void close();
bool send(vector<uchar> &data);
int available();
bool working();
string device() { return identifier_; }
string command() { return command_; }
private:
string identifier_;
string command_;
int pid_ {};
vector<string> args_;
vector<string> envs_;
pthread_mutex_t write_lock_ = PTHREAD_MUTEX_INITIALIZER;
pthread_mutex_t read_lock_ = PTHREAD_MUTEX_INITIALIZER;
};
SerialDeviceCommand::SerialDeviceCommand(string identifier,
string command,
vector<string> args,
vector<string> envs,
SerialCommunicationManagerImp *manager,
string purpose)
: SerialDeviceImp(manager, purpose)
{
assert(identifier != "");
identifier_ = identifier;
command_ = command;
args_ = args;
envs_ = envs;
}
SerialDeviceCommand::~SerialDeviceCommand()
{
close();
}
bool SerialDeviceCommand::open(bool fail_if_not_ok)
{
expectAscii();
bool ok = invokeBackgroundShell("/bin/sh", args_, envs_, &fd_, &pid_);
assert(fd_ >= 0);
if (!ok) return false;
setIsStdin();
verbose("(serialcmd) opened %s pid %d fd %d (%s)\n", command_.c_str(), pid_, fd_, purpose_.c_str());
return true;
}
void SerialDeviceCommand::close()
{
int p = pid_, f = fd_;
if (pid_ == 0 && fd_ == -1) return;
if (pid_ && stillRunning(pid_))
{
stopBackgroundShell(pid_);
pid_ = 0;
}
if (on_disappear_ && !resetting_)
{
on_disappear_();
on_disappear_ = NULL;
}
::flock(fd_, LOCK_UN);
::close(fd_);
fd_ = -1;
manager_->tickleEventLoop();
verbose("(serialcmd) closed %s pid=%d fd=%d (%s)\n", command_.c_str(), p, f, purpose_.c_str());
}
bool SerialDeviceCommand::working()
{
if (resetting_) return true;
if (fd_ == -1) return false;
int n = -1;
int rc = ioctl(fd_, FIONREAD, &n);
if (rc != 0) return false;
// There is still data available for reading,
// even though the child-process might have ended.
if (n > 0) return true;
// No data and no pid. For sure its not working.
if (!pid_) return false;
// Ok check the pid, still running?
bool r = stillRunning(pid_);
if (r) return true;
return false;
}
bool SerialDeviceCommand::send(vector<uchar> &data)
{
LOCK_WRITE_SERIAL(sendcmd);
assert(data.size() > 0);
bool rc = true;
int n = data.size();
int written = 0;
while (true) {
int nw = write(fd_, &data[written], n-written);
if (nw > 0) written += nw;
if (nw < 0) {
if (errno==EINTR) continue;
rc = false;
goto end;
}
if (written == n) break;
}
if (isDebugEnabled()) {
string msg = bin2hex(data);
debug("(serial %s) sent \"%s\"\n", command_.c_str(), msg.c_str());
}
end:
return rc;
}
struct SerialDeviceFile : public SerialDeviceImp
{
SerialDeviceFile(string file, SerialCommunicationManagerImp *manager, string purpose);
~SerialDeviceFile();
bool open(bool fail_if_not_ok);
void close();
bool working();
bool send(vector<uchar> &data);
int available();
string device() { return file_; }
private:
string file_;
};
SerialDeviceFile::SerialDeviceFile(string file,
SerialCommunicationManagerImp *manager,
string purpose)
: SerialDeviceImp(manager, purpose)
{
file_ = file;
}
SerialDeviceFile::~SerialDeviceFile()
{
close();
}
bool SerialDeviceFile::open(bool fail_if_not_ok)
{
if (file_ == "stdin")
{
fd_ = 0;
int flags = fcntl(0, F_GETFL);
flags |= O_NONBLOCK;
fcntl(0, F_SETFL, flags);
setIsStdin();
verbose("(serialfile) reading from stdin (%s)\n", purpose_.c_str());
}
else
{
bool ok = checkFileExists(file_.c_str());
if (!ok) return false;
fd_ = ::open(file_.c_str(), O_RDONLY | O_NONBLOCK);
if (fd_ == -1)
{
if (fail_if_not_ok) error("Could not open file %s for reading.\n", file_.c_str());
verbose("(serialdevicefile) could not open file %s for reading.\n", file_.c_str());
return false;
}
setIsFile();
verbose("(serialfile) reading from file %s (%s)\n", file_.c_str(), purpose_.c_str());
}
manager_->tickleEventLoop();
return true;
}
void SerialDeviceFile::close()
{
if (fd_ == -1) return;
::flock(fd_, LOCK_UN);
::close(fd_);
fd_ = -1;
manager_->tickleEventLoop();
verbose("(serialfile) closed %s %d (%s)\n", file_.c_str(), fd_, purpose_.c_str());
}
bool SerialDeviceFile::working()
{
if (resetting_) return true;
if (fd_ == -1) return false;
int n = -1;
int rc = ioctl(fd_, FIONREAD, &n);
// The file descriptor was bad.
if (rc != 0) return false;
// There is still data available for reading.
if (n > 0) return true;
// Oh it is still open, lets continue use it.
// This could be stdin for example.
return true;
}
bool SerialDeviceFile::send(vector<uchar> &data)
{
return true;
}
struct SerialDeviceSimulator : public SerialDeviceImp
{
SerialDeviceSimulator(SerialCommunicationManagerImp *m, string purpose) :
SerialDeviceImp(m, purpose)
{
verbose("(serialsimulator) opened (%s)\n", purpose_.c_str());
};
~SerialDeviceSimulator() { };
bool open(bool fail_if_not_ok) { return true; };
void close() { };
bool readonly() { return true; }
bool send(vector<uchar> &data) { return true; };
void fill(vector<uchar> &data) { data_ = data; on_data_(); }; // Fill buffer and trigger callback.
int receive(vector<uchar> *data)
{
*data = data_;
data_.clear();
return data->size();
}
int available() { return data_.size(); }
int fd() { return -1; }
bool working() { return false; } // Only one message that has already been handled! So return false here.
private:
vector<uchar> data_;
};
SerialCommunicationManagerImp::SerialCommunicationManagerImp(time_t exit_after_seconds,
bool start_event_loop)
{
running_ = true;
// Block the event loop until everything is configured.
if (start_event_loop)
{
event_loop_mutex_.lock();
startEventLoopThread(call(this, eventLoop));
startTimerLoopThread(call(this, timerLoop));
}
wakeMeUpOnSigChld(getEventLoopThread());
start_time_ = time(NULL);
exit_after_seconds_ = exit_after_seconds;
}
shared_ptr<SerialDevice> SerialCommunicationManagerImp::createSerialDeviceTTY(string device,
int baud_rate,
PARITY parity,
string purpose)
{
return addSerialDeviceForManagement(new SerialDeviceTTY(device, baud_rate, parity, this, purpose));
}
shared_ptr<SerialDevice> SerialCommunicationManagerImp::createSerialDeviceCommand(string identifier,
string command,
vector<string> args,
vector<string> envs,
string purpose)
{
return addSerialDeviceForManagement(new SerialDeviceCommand(identifier, command, args, envs, this, purpose));
}
shared_ptr<SerialDevice> SerialCommunicationManagerImp::createSerialDeviceFile(string file, string purpose)
{
return addSerialDeviceForManagement(new SerialDeviceFile(file, this, purpose));
}
shared_ptr<SerialDevice> SerialCommunicationManagerImp::createSerialDeviceSimulator()
{
return addSerialDeviceForManagement(new SerialDeviceSimulator(this, ""));
}
void SerialCommunicationManagerImp::listenTo(SerialDevice *sd, function<void()> cb)
{
if (sd == NULL) return;
SerialDeviceImp *si = dynamic_cast<SerialDeviceImp*>(sd);
if (!si)
{
error("Internal error: Invalid serial device passed to listenTo.\n");
}
si->on_data_ = cb;
}
void SerialCommunicationManagerImp::onDisappear(SerialDevice *sd, function<void()> cb)
{
if (sd == NULL) return;
SerialDeviceImp *si = dynamic_cast<SerialDeviceImp*>(sd);
if (!si)
{
error("Internal error: Invalid serial device passed to onDisappear.\n");
}
si->on_disappear_ = cb;
}
void SerialCommunicationManagerImp::expectDevicesToWork()
{
debug("(serial) expecting devices to work\n");
expect_devices_to_work_ = true;
}
void SerialCommunicationManagerImp::stop()
{
// Notify the main waitForStop thread that we are stopped!
if (running_ == true)
{
debug("(serial) stopping manager\n");
running_ = false;
if (getMainThread() != 0)
{
if (signalsInstalled())
{
if (getMainThread()) pthread_kill(getMainThread(), SIGUSR2);
if (getEventLoopThread()) pthread_kill(getEventLoopThread(), SIGUSR1);
if (getTimerLoopThread()) pthread_kill(getTimerLoopThread(), SIGUSR1);
}
}
}
}
void SerialCommunicationManagerImp::startEventLoop()
{
// Release the event loop!
event_loop_mutex_.unlock();
}
void SerialCommunicationManagerImp::waitForStop()
{
debug("(serial) waiting for stop\n");
recordMyselfAsMainThread();
while (running_)
{
{
LOCK_SERIAL_DEVICES(wait_for_stop);
if (serial_devices_.size() == 0) break;
}
int rc = usleep(1000*1000);
if (rc == -1 && errno == EINTR)
{
debug("(serial) MAIN thread interrupted\n");
continue;
}
}
closeAllDoNotRemove();
if (signalsInstalled())
{
if (getEventLoopThread()) pthread_kill(getEventLoopThread(), SIGUSR1);
if (getTimerLoopThread()) pthread_kill(getTimerLoopThread(), SIGUSR1);
}
pthread_join(getEventLoopThread(), NULL);
pthread_join(getTimerLoopThread(), NULL);
}
bool SerialCommunicationManagerImp::isRunning()
{
return running_;
}
shared_ptr<SerialDevice> SerialCommunicationManagerImp::addSerialDeviceForManagement(SerialDevice *sd)
{
LOCK_SERIAL_DEVICES(opened);
shared_ptr<SerialDevice> ptr = shared_ptr<SerialDevice>(sd);
serial_devices_.push_back(ptr);
tickleEventLoop();
return ptr;
}
void SerialCommunicationManagerImp::tickleEventLoop()
{
LOCK_SERIAL_DEVICES(tickle);
if (signalsInstalled())
{
// Tickle the event loop to use the new file descriptor in the select.
if (getEventLoopThread()) pthread_kill(getEventLoopThread(), SIGUSR1);
}
}
void SerialCommunicationManagerImp::removeNonWorkingSerialDevices()
{
LOCK_SERIAL_DEVICES(remove_non_working_serial_devices);
for (auto i = serial_devices_.begin(); i != serial_devices_.end(); )
{
if ((*i)->opened() && !(*i)->working())
{
i = serial_devices_.erase(i);
}
else
{
i++;
}
}
if (serial_devices_.size() == 0 && expect_devices_to_work_)
{
debug("(serial) no devices working emergency exit!\n");
stop();
}
}
void SerialCommunicationManagerImp::closeAllDoNotRemove()
{
LOCK_SERIAL_DEVICES(close_all_do_not_remove);
if (serial_devices_.size() == 0) return;
debug("(serial) closing %d devices\n", serial_devices_.size());
for (auto i = serial_devices_.begin(); i != serial_devices_.end(); i++)
{
(*i)->close();
}
}
void SerialCommunicationManagerImp::executeTimerCallbacks()
{
time_t curr = time(NULL);
vector<Timer> to_be_called;
{
LOCK_TIMERS(execute_timer_callbacks);
for (Timer &t : timers_)
{
if (t.isTime(curr))
{
trace("[SERIAL] timer isTime! %d %s\n", t.id, t.name.c_str());
t.last_call = curr;
to_be_called.push_back(t);
}
}
}
for (Timer &t : to_be_called)
{
trace("[SERIAL] invoking callback %s(%d)\n", t.name.c_str(), t.id);
t.callback();
}
}
time_t SerialCommunicationManagerImp::calculateTimeToNearestTimerCallback(time_t now)
{
time_t r = 1024*1024*1024;
for (Timer &t : timers_)
{
// Expected time when to trigger in the future.
// Well, could be in the past as well, if we are unlucky.
time_t done = t.last_call+t.seconds;
// Now how long time is it left....could be negative
// if we are late.
time_t remaining = done-now;
if (remaining < r) r = remaining;
}
return r;
}
void *SerialCommunicationManagerImp::timerLoop()
{
while (running_)
{
int rc = usleep(1000*1000);
if (rc == -1 && errno == EINTR)
{
debug("(serial) TIMER thread interrupted\n");
continue;
}
time_t curr = time(NULL);
if (exit_after_seconds_ > 0)
{
time_t diff = curr-start_time_;
if (diff > exit_after_seconds_)
{
// Running time limit hit, now stop.
verbose("(serial) exit after %ld seconds\n", diff);
stop();
break;
}
}
executeTimerCallbacks();
}
return NULL;
}
void *SerialCommunicationManagerImp::eventLoop()
{
LOCK_EVENT_LOOP(eventLoop);
fd_set readfds;
while (running_)
{
FD_ZERO(&readfds);
bool all_working = true;
{
LOCK_SERIAL_DEVICES(list_file_descriptiors_to_listen_to);
for (shared_ptr<SerialDevice> &sd : serial_devices_)
{
if (sd->opened() && sd->working() && !sd->skippingCallbacks())
{
if (!sd->resetting() && sd->fd() >= 0)
{
trace("[SERIAL] select read on fd %d\n", sd->fd());
FD_SET(sd->fd(), &readfds);
}
}
if (sd->opened() && !sd->working()) all_working = false;
}
}
if (!all_working && expect_devices_to_work_)
{
debug("(serial) not all devices working, emergency exit!\n");
stop();
break;
}
// Perform a select call every second.
struct timeval timeout { 1, 0 };
trace("[SERIAL] select timeout %d s\n", timeout.tv_sec);
int max_fd = 0;
for (shared_ptr<SerialDevice> &sp : serial_devices_)
{
if (sp->fd() > max_fd)
{
max_fd = sp->fd();
}
}
int activity = select(max_fd+1 , &readfds, NULL , NULL, &timeout);
if (activity == -1 && errno == EINTR)
{
debug("(serial) EVENT thread interrupted\n");
}
if (!running_) break;
if (activity < 0 && errno!=EINTR)
{
warning("(serial) internal error after select! errno=%s\n", strerror(errno));
}
if (activity > 0)
{
// Something has happened that caused the sleeping select to wake up.
vector<shared_ptr<SerialDevice>> to_be_notified;
{
LOCK_SERIAL_DEVICES(find_triggering_file_descriptions);
for (shared_ptr<SerialDevice> &sd : serial_devices_)
{
if (sd->opened() && sd->working() && !sd->resetting() && sd->fd() >= 0)
{
if (FD_ISSET(sd->fd(), &readfds))
{
trace("[SERIAL] select detected data available for reading on fd %d\n", sd->fd());
to_be_notified.push_back(sd);
}
}
}
}
for (shared_ptr<SerialDevice> &sd : to_be_notified)
{
SerialDeviceImp *si = dynamic_cast<SerialDeviceImp*>(sd.get());
if (si->on_data_)
{
si->on_data_();
}
}
}
vector<shared_ptr<SerialDevice>> non_working;
{
LOCK_SERIAL_DEVICES(find_non_working_serial_devices);
for (shared_ptr<SerialDevice> &sd : serial_devices_)
{
if (sd->opened() && !sd->working() && !sd->isClosed()) non_working.push_back(sd);
}
}
for (shared_ptr<SerialDevice> &sd : non_working)
{
debug("(serial) closing non working fd=%d \"%s\"\n", sd->fd(), sd->device().c_str());
sd->close();
}
removeNonWorkingSerialDevices();
if (non_working.size() > 0 && expect_devices_to_work_)
{
debug("(serial) non working devices found, exiting.\n");
stop();
break;
}
}
verbose("(serial) event loop stopped!\n");
return NULL;
}
shared_ptr<SerialCommunicationManager> createSerialCommunicationManager(time_t exit_after_seconds,
bool start_event_loop)
{
return shared_ptr<SerialCommunicationManager>(new SerialCommunicationManagerImp(exit_after_seconds,
start_event_loop));
}
static int openSerialTTY(const char *tty, int baud_rate, PARITY parity)
{
int rc = 0;
speed_t speed = 0;
struct termios tios;
string tty_info;
//int DTR_flag = TIOCM_DTR;
int fd = open(tty, O_RDWR | O_NOCTTY | O_NONBLOCK);
if (fd == -1) {
usleep(1000*1000);
fd = open(tty, O_RDWR | O_NOCTTY | O_NONBLOCK);
if (fd == -1) goto err;
}
rc = flock(fd, LOCK_EX | LOCK_NB);
if (rc == -1)
{
// It is already locked by another wmbusmeter process.
fd = -2;
goto err;
}
tty_info = showTTYSettings(fd);
debug("(serial) before config: %s %s\n", tty, tty_info.c_str());
switch (baud_rate)
{
case 300: speed = B300; break;
case 600: speed = B600; break;
case 1200: speed = B1200; break;
case 2400: speed = B2400; break;
case 4800: speed = B4800; break;
case 9600: speed = B9600; break;
case 19200: speed = B19200; break;
case 38400: speed = B38400; break;
case 57600: speed = B57600; break;
case 115200: speed = B115200;break;
default:
goto err;
}
memset(&tios, 0, sizeof(tios));
rc = cfsetispeed(&tios, speed);
if (rc < 0) goto err;
rc = cfsetospeed(&tios, speed);
if (rc < 0) goto err;
// CREAD=Enable receive CLOCAL=Ignore any Carrier Detect signal.
tios.c_cflag |= (CREAD | CLOCAL);
tios.c_cflag &= ~CSIZE;
tios.c_cflag |= CS8;
tios.c_cflag &=~ CSTOPB;
if (parity == PARITY::NONE)
{
// Disable parity bit.
tios.c_cflag &=~ PARENB;
}
else if (parity == PARITY::EVEN)
{
// Enable parity even, ie not odd.
tios.c_cflag |= PARENB;
tios.c_cflag &=~ PARODD;
}
else if (parity == PARITY::ODD)
{
// Enable parity odd.
tios.c_cflag |= PARENB;
tios.c_cflag |= PARODD;
}
else
{
assert(0);
}
tios.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
tios.c_iflag &= ~INPCK;
tios.c_iflag &= ~(IXON | IXOFF | IXANY);
tios.c_oflag &=~ OPOST;
tios.c_cc[VMIN] = 0;
tios.c_cc[VTIME] = 0;
rc = tcsetattr(fd, TCSANOW, &tios);
if (rc < 0) goto err;
// This code can toggle DTR... maybe necessary
// for the pl2303 usb2serial driver/device.
//rc = ioctl(fd, TIOCMBIC, &DTR_flag);
//if (rc != 0) goto err;
tty_info = showTTYSettings(fd);
debug("(serial) after config: %s %s\n", tty, tty_info.c_str());
return fd;
err:
if (fd > 0)
{
close(fd);
fd = -1;
}
return fd;
}
SerialCommunicationManager::~SerialCommunicationManager()
{
}
int SerialCommunicationManagerImp::startRegularCallback(string name, int seconds, function<void()> callback)
{
LOCK_TIMERS(start_regular_callback);
Timer t = { (int)timers_.size(), seconds, time(NULL), callback, name };
timers_.push_back(t);
debug("(serial) registered regular callback %s(%d) every %d seconds\n", name.c_str(), t.id, seconds);
return t.id;
}
void SerialCommunicationManagerImp::stopRegularCallback(int id)
{
LOCK_TIMERS(stop_regular_callback);
debug("(serial) stopping regular callback %d\n", id);
for (auto i = timers_.begin(); i != timers_.end(); ++i)
{
if ((*i).id == id)
{
timers_.erase(i);
break;
}
}
}
shared_ptr<SerialDevice> SerialCommunicationManagerImp::lookup(string device)
{
LOCK_SERIAL_DEVICES(lookup);
for (auto sd : serial_devices_)
{
if (sd->device() == device) return shared_ptr<SerialDevice>(sd);
}
return NULL;
}
bool SerialCommunicationManagerImp::removeNonWorking(string device)
{
LOCK_SERIAL_DEVICES(remove_non_working);
bool found_and_removed = false;
for (auto i = serial_devices_.begin(); i != serial_devices_.end(); )
{
if ((*i)->opened() && !(*i)->working() && (*i)->device() == device)
{
i = serial_devices_.erase(i);
found_and_removed = true;
}
else
{
i++;
}
}
return found_and_removed;
}
#if defined(__APPLE__) || defined(__FreeBSD__)
vector<string> SerialCommunicationManagerImp::listSerialTTYs()
{
vector<string> list;
list.push_back("Please add code here!");
return list;
}
#endif
#if defined(__linux__)
static string lookup_device_driver(string tty)
{
struct stat st;
tty += "/device";
int rc = lstat(tty.c_str(), &st);
if (rc==0 && S_ISLNK(st.st_mode))
{
tty += "/driver";
char buffer[1024];
memset(buffer, 0, sizeof(buffer));
int rc = readlink(tty.c_str(), buffer, sizeof(buffer));
if (rc > 0)
{
return basename(buffer);
}
}
return "";
}
static void check_if_serial(string tty, vector<string> *found_serials, vector<string> *found_8250s)
{
string driver = lookup_device_driver(tty);
if (driver.size() > 0)
{
char buffer[1024];
memset(buffer, 0, sizeof(buffer));
strncpy(buffer, tty.c_str(), sizeof(buffer)-1);
string dev = buffer;
if (driver == "serial8250")
{
found_8250s->push_back(dev);
}
else
{
// The dev is now something like: /sys/class/tty/ttyUSB0
// Drop the /sys/class/tty/ prefix and replace with /dev/
if (dev.rfind("/sys/class/tty/", 0) == 0) {
dev = string("/dev/")+dev.substr(15);
}
found_serials->push_back(dev);
}
}
}
static void check_serial8250s(vector<string> *found_serials, vector<string> &found_8250s)
{
struct serial_struct serinfo;
for (string dev : found_8250s)
{
int fd = open(dev.c_str(), O_RDWR | O_NONBLOCK | O_NOCTTY);
if (fd >= 0)
{
int rc = ioctl(fd, TIOCGSERIAL, &serinfo);
if (rc == 0)
{
if (serinfo.type != PORT_UNKNOWN)
{
found_serials->push_back(dev);
}
close(fd);
}
}
}
}
int sorty(const struct dirent **a, const struct dirent **b)
{
return strcmp((*a)->d_name, (*b)->d_name);
}
vector<string> SerialCommunicationManagerImp::listSerialTTYs()
{
struct dirent **entries;
vector<string> found_serials;
vector<string> found_8250s;
string sysdir = "/sys/class/tty/";
int n = scandir(sysdir.c_str(), &entries, NULL, sorty);
if (n < 0)
{
perror("scandir");
return found_serials;
}
for (int i=0; i<n; ++i)
{
string name = entries[i]->d_name;
if (name == ".." || name == ".")
{
free(entries[i]);
continue;
}
string tty = sysdir+name;
check_if_serial(tty, &found_serials, &found_8250s);
free(entries[i]);
}
free(entries);
check_serial8250s(&found_serials, found_8250s);
return found_serials;
}
#endif
#define CHECK_SPEED(x) { if (speed == x) return #x; }
string translateSpeed(speed_t speed)
{
string flags;
CHECK_SPEED(B50)
CHECK_SPEED(B75)
CHECK_SPEED(B110)
CHECK_SPEED(B134)
CHECK_SPEED(B150)
CHECK_SPEED(B200)
CHECK_SPEED(B300)
CHECK_SPEED(B600)
CHECK_SPEED(B1200)
CHECK_SPEED(B1800)
CHECK_SPEED(B2400)
CHECK_SPEED(B4800)
CHECK_SPEED(B9600)
#ifdef B57600
CHECK_SPEED(B57600)
#endif
#ifdef B115200
CHECK_SPEED(B115200)
#endif
CHECK_SPEED(B19200)
#ifdef B230400
CHECK_SPEED(B230400)
#endif
CHECK_SPEED(B38400)
#ifdef B460800
CHECK_SPEED(B460800)
#endif
#ifdef B500000
CHECK_SPEED(B500000)
#endif
#ifdef B57600
CHECK_SPEED(B57600)
#endif
#ifdef B921600
CHECK_SPEED(B921600)
#endif
#ifdef B1000000
CHECK_SPEED(B1000000)
#endif
#ifdef B1152000
CHECK_SPEED(B1152000)
#endif
#ifdef B1500000
CHECK_SPEED(B1500000)
#endif
#ifdef B2000000
CHECK_SPEED(B2000000)
#endif
#ifdef B2500000
CHECK_SPEED(B2500000)
#endif
#ifdef B3000000
CHECK_SPEED(B3000000)
#endif
#ifdef B3500000
CHECK_SPEED(B3500000)
#endif
#ifdef B4000000
CHECK_SPEED(B4000000)
#endif
return "UnknownSpeed";
};
#undef CHECK_SPEED
string lookupSpeed(struct termios *tios)
{
speed_t in = cfgetispeed(tios);
speed_t out = cfgetispeed(tios);
if (in == out)
{
return translateSpeed(in);
}
return translateSpeed(in)+","+translateSpeed(out);
}
#define CHECK_FLAG(x) { if (bits & x) flags += #x "|"; }
string iflags(tcflag_t bits)
{
string flags;
CHECK_FLAG(BRKINT)
CHECK_FLAG(ICRNL)
CHECK_FLAG(IGNBRK)
CHECK_FLAG(IGNCR)
CHECK_FLAG(IGNPAR)
#ifdef IMAXBEL
CHECK_FLAG(IMAXBEL)
#endif
CHECK_FLAG(INLCR)
CHECK_FLAG(ISTRIP)
#ifdef IUTF8
CHECK_FLAG(IUTF8)
#endif
CHECK_FLAG(IXANY)
CHECK_FLAG(IXOFF)
CHECK_FLAG(IXON)
CHECK_FLAG(PARMRK)
if (flags.length() > 0) flags.pop_back();
return flags;
};
string oflags(tcflag_t bits)
{
string flags;
#ifdef BS1
CHECK_FLAG(BS1)
#endif
#ifdef NL1
CHECK_FLAG(NL1)
#endif
CHECK_FLAG(ONLCR)
#ifdef ONOEOT
CHECK_FLAG(ONOEOT)
#endif
CHECK_FLAG(OPOST)
#ifdef OXTABS
CHECK_FLAG(OXTABS)
#endif
if (flags.length() > 0) flags.pop_back();
return flags;
};
string cflags(tcflag_t bits)
{
string flags;
CHECK_FLAG(CLOCAL)
CHECK_FLAG(CREAD)
CHECK_FLAG(CSIZE)
CHECK_FLAG(CSTOPB)
CHECK_FLAG(HUPCL)
CHECK_FLAG(PARENB)
CHECK_FLAG(PARODD)
if (flags.length() > 0) flags.pop_back();
return flags;
};
string lflags(tcflag_t bits)
{
string flags;
CHECK_FLAG(ECHO)
CHECK_FLAG(ECHOCTL)
CHECK_FLAG(ECHOE)
CHECK_FLAG(ECHOK)
CHECK_FLAG(ECHOKE)
CHECK_FLAG(ECHONL)
CHECK_FLAG(ECHOPRT)
CHECK_FLAG(FLUSHO)
CHECK_FLAG(ICANON)
CHECK_FLAG(IEXTEN)
CHECK_FLAG(ISIG)
CHECK_FLAG(NOFLSH)
CHECK_FLAG(PENDIN)
CHECK_FLAG(TOSTOP)
#ifdef XCASE
CHECK_FLAG(XCASE)
#endif
if (flags.length() > 0) flags.pop_back();
return flags;
};
#undef CHECK_FLAG
string showSpecialChars(struct termios *tios)
{
string s;
int n = sizeof(tios->c_cc)/sizeof(cc_t);
for (int i=0; i<n; ++i)
{
cc_t c = tios->c_cc[i];
if (c != 0)
{
string cc;
strprintf(cc, "%u", c);
s += cc+",";
}
}
if (s.length() > 0) s.pop_back();
return s;
}
static string showTTYSettings(int fd)
{
string info;
string bits;
struct termios tios;
int modem_bits;
int rc = tcgetattr(fd, &tios);
if (rc != 0) goto err;
info += "speed("+lookupSpeed(&tios)+") ";
info += "input("+iflags(tios.c_iflag) + ") ";
info += "output("+oflags(tios.c_oflag) + ") ";
info += "control("+cflags(tios.c_cflag) + ") ";
info += "local("+lflags(tios.c_lflag) + ") ";
info += "special_chars("+showSpecialChars(&tios)+") ";
rc = ioctl(fd, TIOCMGET, &modem_bits);
if (rc != 0) goto err;
if (modem_bits & TIOCM_LE) bits += "LE|"; // Line Enabled (same as DSR below?)
if (modem_bits & TIOCM_DTR) bits += "DTR|"; // Data Terminal Ready (Computer is ready.)
if (modem_bits & TIOCM_RTS) bits += "RTS|"; // Request to send (hardware flow control)
if (modem_bits & TIOCM_ST) bits += "ST|";
if (modem_bits & TIOCM_SR) bits += "SR|";
if (modem_bits & TIOCM_CTS) bits += "CTS|"; // Clear to Send (hardware flow control)
if (modem_bits & TIOCM_CD) bits += "CD|"; // Data Carrier Detected (Modem is connected to another modem)
if (modem_bits & TIOCM_RI) bits += "RING|"; // Ring Indicator
if (modem_bits & TIOCM_DSR) bits += "DSR|"; // Data Set Ready (Modem is ready.)
if (bits.length() > 0) bits.pop_back();
info += "modem("+bits+")";
return info;
err:
return "error";
}
AccessCheck SerialCommunicationManagerImp::checkAccess(string device,
shared_ptr<SerialCommunicationManager> manager,
string extra_info,
function<AccessCheck(string,shared_ptr<SerialCommunicationManager>)> extra_probe)
{
assert(device != "");
if (extra_info == "")
{
extra_info = "serial";
}
debug("(%s) check if %s can be accessed\n", extra_info.c_str(), device.c_str());
AccessCheck ac = checkIfExistsAndHasAccess(device);
if (ac == AccessCheck::AccessOK)
{
if (!extra_probe)
{
verbose("(%s) tty %s can be accessed\n", extra_info.c_str(), device.c_str());
return AccessCheck::AccessOK;
}
verbose("(%s) tty %s can be accessed now probing...\n", extra_info.c_str(), device.c_str());
ac = extra_probe(device, manager);
verbose("(%s) probe returns %s\n", extra_info.c_str(), toString(ac));
return ac;
}
if (ac == AccessCheck::NoPermission)
{
verbose("(serial) you do not have the correct permissions to open the tty %s, but at least you share the same access group.\n",
device.c_str());
return AccessCheck::NoPermission;
}
if (ac == AccessCheck::NotSameGroup)
{
verbose("(serial) you do not have the correct permissions to open the tty %s and you do not share the same access group.\n",
device.c_str());
return AccessCheck::NotSameGroup;
}
verbose("(serial) cannot open/find tty %s.\n",
device.c_str());
return AccessCheck::NoSuchDevice;
}
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