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modify serial device settings instead of using empty template; check if serial fd is a valid terminal

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This commit is contained in:
Roland Jax
2014-11-28 14:19:31 +01:00
parent 8c5de31d98
commit 10839f770f
2 changed files with 16 additions and 17 deletions
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src/lib/ebus/port.cpp
+13 -14
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@@ -135,35 +135,34 @@ unsigned char Device::getByte()
void DeviceSerial::openDevice(const string deviceName, const bool noDeviceCheck)
{
m_noDeviceCheck = noDeviceCheck;
termios newSettings;
struct termios settings;
m_open = false;
// open file descriptor from serial device
// open file descriptor
m_fd = open(deviceName.c_str(), O_RDWR | O_NOCTTY);
if (m_fd < 0)
if (m_fd < 0 || isatty(m_fd) == 0)
return;
// save current settings of serial device
// save current settings
tcgetattr(m_fd, &m_oldSettings);
memset(&newSettings, '\0', sizeof(newSettings));
// modify current settings
tcgetattr(m_fd, &settings);
newSettings.c_cflag |= (B2400 | CS8 | CLOCAL | CREAD);
newSettings.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
newSettings.c_iflag |= IGNPAR;
newSettings.c_oflag &= ~OPOST;
settings.c_cflag |= (B2400 | CS8 | CLOCAL | CREAD);
settings.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
settings.c_iflag |= IGNPAR;
settings.c_oflag &= ~OPOST;
newSettings.c_cc[VMIN] = 1;
newSettings.c_cc[VTIME] = 0;
settings.c_cc[VMIN] = 1;
settings.c_cc[VTIME] = 0;
// empty device buffer
tcflush(m_fd, TCIFLUSH);
// activate new settings of serial device
tcsetattr(m_fd, TCSANOW, &newSettings);
tcsetattr(m_fd, TCSAFLUSH, &settings);
// set serial device into blocking mode
fcntl(m_fd, F_SETFL, fcntl(m_fd, F_GETFL) & ~O_NONBLOCK);