193     ssize_t rval;  in Read()  local
195     rval = read(mSockFd, buffer, sizeof(buffer));  in Read()
197     if (rval > 0)  in Read()
199         Decode(buffer, static_cast<uint16_t>(rval));  in Read()
201     else if ((rval < 0) && (errno != EAGAIN) && (errno != EINTR))  in Read()
236         ssize_t rval = write(mSockFd, aFrame, aLength);  in Write()  local
238         if (rval == aLength)  in Write()
242         else if (rval > 0)  in Write()
244             aLength -= static_cast<uint16_t>(rval);  in Write()
245             aFrame += static_cast<uint16_t>(rval);  in Write()
247         else if (rval < 0)  in Write()
293     int rval;  in WaitForFrame()  local
300     rval = select(mSockFd + 1, &read_fds, nullptr, &error_fds, &timeout);  in WaitForFrame()
302     if (rval > 0)  in WaitForFrame()
317     else if (rval == 0)  in WaitForFrame()
360     int            rval;  in WaitForWritable()  local
369         rval = select(mSockFd + 1, nullptr, &writeFds, &errorFds, &timeout);  in WaitForWritable()
371         if (rval > 0)  in WaitForWritable()
386         else if ((rval < 0) && (errno != EINTR))  in WaitForWritable()
415     int rval = 0;  in OpenFile()  local
433         VerifyOrExit((rval = tcgetattr(fd, &tios)) == 0);  in OpenFile()
573 …  VerifyOrExit((rval = cfsetspeed(&tios, static_cast<speed_t>(speed))) == 0, perror("cfsetspeed"));  in OpenFile()
574         VerifyOrExit((rval = tcsetattr(fd, TCSANOW, &tios)) == 0, perror("tcsetattr"));  in OpenFile()
575         VerifyOrExit((rval = tcflush(fd, TCIOFLUSH)) == 0);  in OpenFile()
579     if (rval != 0)  in OpenFile()
605     int rval = -1;  in ForkPty()  local
640         VerifyOrDie((rval = execvp(argv[0], argv)) != -1, OT_EXIT_ERROR_ERRNO);  in ForkPty()
644         VerifyOrDie((rval = fcntl(fd, F_GETFL)) != -1, OT_EXIT_ERROR_ERRNO);  in ForkPty()
645 …VerifyOrDie((rval = fcntl(fd, F_SETFL, rval | O_NONBLOCK | O_CLOEXEC)) != -1, OT_EXIT_ERROR_ERRNO);  in ForkPty()