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Notes for using a psuedo tty device instead of the default one that gdb uses.
This allows the executable's stdin and stdout to be separate from gdb's.
Thus any stdin or stdout from gdb's is only gdb/mi commands and results.
// Create a special tty.
int m_ptsFd;
m_ptsFd = openPseudoTerminal() {
int ptsFd = posix_openpt(O_RDWR | O_NOCTTY);
if(grantpt(ptsFd))
critMsg("Failed to grantpt");
if(unlockpt(ptsFd))
critMsg("Failed to unlock pt");
// Set window size
struct winsize term_winsize;
term_winsize.ws_col = 80;
term_winsize.ws_row = 20;
term_winsize.ws_xpixel = 80 * 8;
term_winsize.ws_ypixel = 20 * 8;
if(ioctl(ptsFd, TIOCSWINSZ, &term_winsize) < 0) {
errorMsg("ioctl TIOCSWINSZ failed (%s)", strerror(errno));
}
// Set controlling
if (ioctl(ptsFd, TIOCSCTTY, (char *)0) < 0) {
errorMsg("ioctl TIOCSCTTY failed (%s)", strerror(errno));
}
return ptsFd;
}
// Get the tty's name.
QString ptsDevPath = ptsname(m_ptsFd);
// Tell GDB about the special tty.
com.commandF(&resultData, "-inferior-tty-set %s", stringToCStr(ptsDevPath)
// Close the special tty (when Seer exits).
close(m_ptsFd);
// Create a socket notifier to read stdout of special tty.
// When there's something to read, call 'read' function.
// The socket notifier is set up just before 'run' or 'start'.
// Always delete the old one an create a new one. The special
// tty is never reopened.
if (m_ptsListener) {
delete m_ptsListener;
}
m_ptsListener = new QSocketNotifier(m_ptsFd, QSocketNotifier::Read);
connect(m_ptsListener, SIGNAL(activated(int)), this, SLOT(onGdbOutput(int)));
// Writes to stdin of the special tty.
void writeTargetStdin (QString text) {
QByteArray rawData = text.toLocal8Bit();
int bytesWritten = 0;
int n;
do {
n = write(m_ptsFd, rawData.constData()+bytesWritten, rawData.size()-bytesWritten);
if (n > 0) {
bytesWritten += n;
}else if (n < 0) {
errorMsg("Failed to write data to target stdin");
}
} while(n > 0 && bytesWritten != rawData.size());
fsync(m_ptsFd);
}
// Reads from stdout of the special tty.
void Core::onGdbOutput(int socketFd) {
Q_UNUSED(socketFd);
char buff[128];
buff[0] = '\0';
int n = read(m_ptsFd, buff, sizeof(buff)-1);
if(n > 0) {
buff[n] = '\0';
QString str = QString::fromUtf8(buff);
m_inf->ICore_onTargetOutput(str);
}else{
delete m_ptsListener;
m_ptsListener = NULL;
}
}
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