On 11/02/2010 01:39 PM, Daniel Veillard wrote: > This is a bug I found while testing the smbios support, it uses > virPipeReadUntilEOF to read the stdout of the exec'ed dmidecode > process and this failed to capture the full output. It read only > 1024 bytes. > The problem is that this is based on a poll loop, and in the > loop we read at most 1024 bytes per filedescriptor, but we also > note in the loop if poll indicates that the process won't output > more than that on that fd by setting finished[i] = 1. > The simplest way is that if we read a full buffer make sure > finished[i] is still 0 because we will need another pass in the > loop. > > Daniel > > diff --git a/src/util/util.c b/src/util/util.c > index f7c7d32..a059675 100644 > --- a/src/util/util.c > +++ b/src/util/util.c > @@ -984,6 +984,9 @@ virPipeReadUntilEOF(int outfd, int errfd, > > got = read(fds[i].fd, data, sizeof(data)); > > + if (got == sizeof(data)) > + finished[i] = 0; > + ACK. Worst case is a file that is exactly a multiple of 1024 now requiring one extra read to ascertain this fact, but that's not bad. -- Eric Blake eblake@xxxxxxxxxx +1-801-349-2682 Libvirt virtualization library http://libvirt.org
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