140         ssize_t rval = write(aFile, aBuffer, aSize);  in DoWrite()  local
141         if (rval <= 0)  in DoWrite()
143             VerifyOrExit((rval == -1) && (errno == EINTR), perror("write"); ret = false);  in DoWrite()
147             aBuffer = reinterpret_cast<const uint8_t *>(aBuffer) + rval;  in DoWrite()
148             aSize -= static_cast<size_t>(rval);  in DoWrite()
194         int rval;  in ReconnectSession()  local
199         rval = ConnectSession(aConfig);  in ReconnectSession()
201         VerifyOrExit(rval == -1, ok = true);  in ReconnectSession()
367             ssize_t rval = read(sSessionFd, buffer, sizeof(buffer));  in main()  local
368             VerifyOrExit(rval != -1, perror("read"); ret = OT_EXIT_FAILURE);  in main()
370             if (rval == 0)  in main()
383 …    VerifyOrExit(DoWrite(STDOUT_FILENO, buffer, static_cast<size_t>(rval)), ret = OT_EXIT_FAILURE);  in main()
387                 for (ssize_t i = 0; i < rval; i++)  in main()