mirror of
https://github.com/epasveer/seer.git
synced 2026-08-29 08:34:42 +08:00
Ernie Pasveer
109 lines
2.8 KiB
Plaintext
109 lines
2.8 KiB
Plaintext
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Notes for using a psuedo tty device instead of the default one that gdb uses.
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This allows the executable's stdin and stdout to be separate from gdb's.
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Thus any stdin or stdout from gdb's is only gdb/mi commands and results.
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// Create a special tty.
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int m_ptsFd;
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m_ptsFd = openPseudoTerminal() {
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int ptsFd = posix_openpt(O_RDWR | O_NOCTTY);
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if(grantpt(ptsFd))
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critMsg("Failed to grantpt");
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if(unlockpt(ptsFd))
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critMsg("Failed to unlock pt");
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// Set window size
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struct winsize term_winsize;
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term_winsize.ws_col = 80;
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term_winsize.ws_row = 20;
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term_winsize.ws_xpixel = 80 * 8;
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term_winsize.ws_ypixel = 20 * 8;
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if(ioctl(ptsFd, TIOCSWINSZ, &term_winsize) < 0) {
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errorMsg("ioctl TIOCSWINSZ failed (%s)", strerror(errno));
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}
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// Set controlling
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if (ioctl(ptsFd, TIOCSCTTY, (char *)0) < 0) {
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errorMsg("ioctl TIOCSCTTY failed (%s)", strerror(errno));
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}
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return ptsFd;
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}
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// Get the tty's name.
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QString ptsDevPath = ptsname(m_ptsFd);
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// Tell GDB about the special tty.
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com.commandF(&resultData, "-inferior-tty-set %s", stringToCStr(ptsDevPath)
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// Close the special tty (when Seer exits).
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close(m_ptsFd);
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// Create a socket notifier to read stdout of special tty.
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// When there's something to read, call 'read' function.
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// The socket notifier is set up just before 'run' or 'start'.
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// Always delete the old one an create a new one. The special
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// tty is never reopened.
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if (m_ptsListener) {
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delete m_ptsListener;
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}
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m_ptsListener = new QSocketNotifier(m_ptsFd, QSocketNotifier::Read);
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connect(m_ptsListener, SIGNAL(activated(int)), this, SLOT(onGdbOutput(int)));
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// Writes to stdin of the special tty.
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void writeTargetStdin (QString text) {
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QByteArray rawData = text.toLocal8Bit();
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int bytesWritten = 0;
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int n;
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do {
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n = write(m_ptsFd, rawData.constData()+bytesWritten, rawData.size()-bytesWritten);
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if (n > 0) {
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bytesWritten += n;
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}else if (n < 0) {
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errorMsg("Failed to write data to target stdin");
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}
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} while(n > 0 && bytesWritten != rawData.size());
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fsync(m_ptsFd);
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}
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// Reads from stdout of the special tty.
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void Core::onGdbOutput(int socketFd) {
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Q_UNUSED(socketFd);
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char buff[128];
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buff[0] = '\0';
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int n = read(m_ptsFd, buff, sizeof(buff)-1);
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if(n > 0) {
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buff[n] = '\0';
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QString str = QString::fromUtf8(buff);
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m_inf->ICore_onTargetOutput(str);
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}else{
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delete m_ptsListener;
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m_ptsListener = NULL;
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}
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}
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