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Libvirt provides a portable, long term stable C API for managing the virtualization technologies provided by many operating systems. It includes support for QEMU, KVM, Xen, LXC, bhyve, Virtuozzo, VMware vCenter and ESX, VMware Desktop, Hyper-V, VirtualBox and the POWER Hypervisor.
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5e8ab3915b
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Eric Blake 5e8ab3915b command: avoid potential deadlock on handshake 
There is a theoretical problem of an extreme bug where we can get
into deadlock due to command handshaking.  Thanks to a pair of pipes,
we have a situation where the parent thinks the child reported an
error and is waiting for a message from the child to explain the
error; but at the same time the child thinks it reported success
and is waiting for the parent to acknowledge the success; so both
processes are now blocked.

Thankfully, I don't think this deadlock is possible without at
least one other bug in the code, but I did see exactly that sort
of situation prior to commit da831af - I saw a backtrace where a
double close bug in the parent caused the parent to read from the
wrong fd and assume the child failed, even though the child really
sent success.

This potential deadlock is not quite like commit 858c247 (a deadlock
due to multiple readers on one pipe preventing a write from completing),
although the solution is similar - always close unused pipe fds before
blocking, rather than after.

* src/util/command.c (virCommandHandshakeWait): Close unused fds
sooner.
2012-06-07 09:25:38 -06:00
.gnulib@77cef20220 build: update to latest gnulib 2012-05-29 08:43:55 -06:00
build-aux Autogenerate augeas test case from default config files 2012-05-28 11:07:12 +01:00
daemon build: ensure storage driver is used 2012-06-06 12:16:07 +08:00
docs build: fix 'make distcheck' issues 2012-06-05 09:20:12 -06:00
examples examples: add consolecallback example python script 2012-05-29 16:54:12 -06:00
gnulib build: fix fresh checkout on RHEL5 2012-04-19 17:11:43 -06:00
include Add sentinel for virErrorDomain enum 2012-05-24 16:20:55 +01:00
m4 build: allow building with newer glibc-headers and -O0 2012-06-04 12:08:27 -06:00
po virsh: Switch from generated cmd*Edit commands to nongenerated 2012-06-02 10:40:51 +02:00
python Coverity: Fix the forward_null error in Python binding codes 2012-05-04 10:23:57 +08:00
src command: avoid potential deadlock on handshake 2012-06-07 09:25:38 -06:00
tests rpc: Switch to dynamically allocated message buffer 2012-06-05 17:48:40 +02:00
tools build: fix build without i18n 2012-06-06 21:32:37 -06:00
.dir-locals.el maint: let emacs avoid tabs in rng files 2011-08-13 08:56:26 -06:00
.gitignore build: fix testing of augeas files in VPATH builds 2012-05-30 09:29:32 -06:00
.gitmodules make .gnulib a submodule 2009-07-08 16:17:51 +02:00
.mailmap maint: prune duplicate listings in AUTHORS 2012-02-03 09:56:45 -07:00
AUTHORS Fix for parallel port passthrough for QEMU 2012-06-04 16:46:23 -06:00
autobuild.sh Enable all warnings permanently & default to -Werror for GIT builds 2012-03-27 17:08:06 +01:00
autogen.sh build: allow for local gnulib diffs 2011-11-09 09:03:33 -07:00
bootstrap build: update to latest gnulib 2012-05-29 08:43:55 -06:00
bootstrap.conf build: update to latest gnulib 2012-05-29 08:43:55 -06:00
cfg.mk build: fix sc_prohibit_readlink 2012-06-04 09:29:21 -06:00
ChangeLog-old virterror.c: Fix several spelling mistakes 2012-02-03 11:32:51 -07:00
configure.ac build: ensure storage driver is used 2012-06-06 12:16:07 +08:00
COPYING.LIB remove all trailing blank lines 2009-07-16 15:06:42 +02:00
HACKING Document STREQ_NULLABLE and STRNEQ_NULLABLE 2011-10-06 16:50:38 +02:00
libvirt.pc.in build: silence warning from autoconf 2012-05-30 09:22:02 -06:00
libvirt.spec.in spec: Build against systemd for udev 2012-06-06 16:53:36 -04:00
Makefile.am maint: add missing copyright notices 2011-07-28 15:01:17 -06:00
Makefile.nonreentrant Ban use of all inet_* functions 2010-10-22 11:59:23 +01:00
mingw32-libvirt.spec.in Fix typos in API XML file paths 2012-02-15 11:29:38 +00:00
README Correct typos in the documentation (Atsushi SAKAI) 2008-01-24 10:15:13 +00:00
README-hacking maint: relax git minimum version 2010-02-24 14:29:27 -05:00
TODO Update todo list file to point at bugzilla/website 2010-10-13 16:45:26 +01:00

README 

         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>