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f3d6754415
Previously, the parent process opened 'null' to /dev/null, then the child process closes 'null' as well as 'childout'. But if childout was set to be null, then this is a double close. At least the double close was confined to the child process after a fork, and therefore there is no risk of another thread opening an fd of the same value to be bitten by the double close, but it is always better to avoid double-close to begin with. Additionally, if all three fds were specified, then opening 'null' was wasted. This patch fixes things to lazily open null on the first use, then guarantees it gets closed exactly once. * src/util/command.c (getDevNull): New helper function. (virExecWithHook): Use it to avoid spurious opens and double close.
LibVirt : simple API for virtualization
Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.
Daniel Veillard <veillard@redhat.com>