Re: [libvirt] [PATCHv2] util: ensure safe{read, write, zero} return is checked

> if (priv->errfd != -1) { > - saferead(priv->errfd, errout, sizeof(errout)); > + if (saferead(priv->errfd, errout, sizeof(errout)) < 0) { > + virReportSystemError(errno, "%s", > + _("cannot recv data: unknown reason")); > + return -1; > + } > } Minor point, but is "unknown reason" really the right thing we want to say here? Won't we know the reason from errno?

> remoteDriverLock(priv); > > if (fds[1].revents) { > DEBUG0("Woken up from poll by other thread"); > - saferead(priv->wakeupReadFD, &ignore, sizeof(ignore)); > + ignore_value (saferead(priv->wakeupReadFD, &ignore, > + sizeof(ignore))); Hm. Are we sure we want to ignore the return value here? On the one hand, the fact that we failed to read this byte is irrelevant; it has done it's job to wake us out of poll. On the other hand, if we can't read this one byte, that probably means something more serious is wrong and we might (probably will?) have problems later. Should we goto error here?