On 10/05/13 21:51, Daniel P. Berrange wrote: > From: "Daniel P. Berrange" <berrange(a)redhat.com&gt; > > In b2878ed860ceceec3cd6481424fed0b543b687cd we added the O_NOCTTY > flag when opening files in the stream code. Unfortunately a later > piece of code was comparing the flags == O_RDONLY, without masking > out the non-access mode flags. This broke the iohelper when used > with streams for read, since it caused us to attach the stream > output pipe to the stream input FD instead of output FD :-( > > Signed-off-by: Daniel P. Berrange <berrange(a)redhat.com&gt; > --- > src/fdstream.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/src/fdstream.c b/src/fdstream.c > index 6f8ce53..a9a4851 100644 > --- a/src/fdstream.c > +++ b/src/fdstream.c > @@ -641,7 +641,7 @@ virFDStreamOpenFileInternal(virStreamPtr st, > virCommandTransferFD(cmd, fd); > virCommandAddArgFormat(cmd, "%d", fd); > - if (oflags == O_RDONLY) { > + if ((oflags & O_ACCMODE) == O_RDONLY) { > childfd = fds[1]; > fd = fds[0]; > virCommandSetOutputFD(cmd, &childfd); ACK. I went a bit far away to find the cause.. :-(