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3 Commits

Author SHA1 Message Date
Daniel P. Berrange e155494cf0 io: some fixes to handling of /dev/null when running commands 
The /dev/null file handle was leaked in a couple of places.
There is also the possibility that both readfd and writefd
point to the same /dev/null file handle, so care must be
taken not to close the same file handle twice.

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
 2016-01-20 11:30:56 +00:00
Daniel P. Berrange 0c0a55b229 io: increment counter when killing off subcommand 
When killing the subcommand, it is intended to first send
SIGTERM, then SIGKILL and only report an error if it still
doesn't die after SIGKILL. The 'step' counter was not
being incremented though, so the code never got past the
SIGTERM stage.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
 2016-01-19 14:03:27 +00:00
Daniel P. Berrange 195e14d026 io: add QIOChannelCommand class 
Add a QIOChannel subclass that is capable of performing I/O
to/from a separate process, via a pair of pipes. The command
can be used for unidirectional or bi-directional I/O.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
 2015-12-18 12:18:31 +00:00