196     ssize_t rval;  in Read()  local
198     rval = read(mSockFd, buffer, sizeof(buffer));  in Read()
200     if (rval > 0)  in Read()
202         Decode(buffer, static_cast<uint16_t>(rval));  in Read()
204     else if ((rval < 0) && (errno != EAGAIN) && (errno != EINTR))  in Read()
242         ssize_t rval = write(mSockFd, aFrame, aLength);  in Write()  local
244         if (rval == aLength)  in Write()
248         else if (rval > 0)  in Write()
250             aLength -= static_cast<uint16_t>(rval);  in Write()
251             aFrame += static_cast<uint16_t>(rval);  in Write()
253         else if (rval < 0)  in Write()
312     int rval;  in WaitForFrame()  local
319     rval = select(mSockFd + 1, &read_fds, nullptr, &error_fds, &timeout);  in WaitForFrame()
321     if (rval > 0)  in WaitForFrame()
336     else if (rval == 0)  in WaitForFrame()
398     int            rval;  in WaitForWritable()  local
407         rval = select(mSockFd + 1, nullptr, &writeFds, &errorFds, &timeout);  in WaitForWritable()
409         if (rval > 0)  in WaitForWritable()
424         else if ((rval < 0) && (errno != EINTR))  in WaitForWritable()
453     int rval = 0;  in OpenFile()  local
470         VerifyOrExit((rval = tcgetattr(fd, &tios)) == 0);  in OpenFile()
619 …  VerifyOrExit((rval = cfsetspeed(&tios, static_cast<speed_t>(speed))) == 0, perror("cfsetspeed"));  in OpenFile()
620         rval = tcsetattr(fd, TCSANOW, &tios);  in OpenFile()
623         if (rval)  in OpenFile()
626             VerifyOrExit((rval = tcgetattr(fd, &orig_tios)) == 0, perror("tcgetattr"));  in OpenFile()
627 …    VerifyOrExit((rval = cfsetispeed(&tios, cfgetispeed(&orig_tios))) == 0, perror("cfsetispeed"));  in OpenFile()
628 …    VerifyOrExit((rval = cfsetospeed(&tios, cfgetospeed(&orig_tios))) == 0, perror("cfsetospeed"));  in OpenFile()
629             VerifyOrExit((rval = tcsetattr(fd, TCSANOW, &tios)) == 0, perror("tcsetattr"));  in OpenFile()
630             VerifyOrExit((rval = ioctl(fd, IOSSIOSPEED, &speed)) == 0, perror("ioctl IOSSIOSPEED"));  in OpenFile()
633         VerifyOrExit(rval == 0, perror("tcsetattr"));  in OpenFile()
635         VerifyOrExit((rval = tcflush(fd, TCIOFLUSH)) == 0);  in OpenFile()
639     if (rval != 0)  in OpenFile()
665     int rval = -1;  in ForkPty()  local
700         VerifyOrDie((rval = execvp(argv[0], argv)) != -1, OT_EXIT_ERROR_ERRNO);  in ForkPty()
704         VerifyOrDie((rval = fcntl(fd, F_GETFL)) != -1, OT_EXIT_ERROR_ERRNO);  in ForkPty()
705 …VerifyOrDie((rval = fcntl(fd, F_SETFL, rval | O_NONBLOCK | O_CLOEXEC)) != -1, OT_EXIT_ERROR_ERRNO);  in ForkPty()