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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Daniel P. Berrangé fc06debd0c qemu: remove pointless connect retry logic in agent
When the agent code was first introduced back in

  commit c160ce3316
  Author: Daniel P. Berrange <berrange@redhat.com>
  Date:   Wed Oct 5 18:31:54 2011 +0100

    QEMU guest agent support

there was code that would loop and retry the connection when opening
the agent socket. At this time, the only thing done in between the
opening of the monitor socket & opening of the agent socket was a
call to set the monitor capabilities. This was a no-op on non-QMP
versions, so in theory there could be a race which let us connect
to the monitor while the agent socket was still not created by QEMU.

In the modern world, however, we long ago mandated the use of QMP
for managing QEMU, so we're guaranteed to have a set capabilities
QMP call. Once we've seen a reply to this, we're guaranteed that
QEMU has fully initialized all backends and is in its event loop.

We can thus be sure the QEMU agent socket is present and don't need
to retry connections to it, even without having the chardev FD passing
feature.

Reviewed-by: John Ferlan <jferlan@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
2018-06-05 17:30:57 +01:00
.gnulib@d6397dde2e Update to latest gnulib 2018-03-12 11:27:54 +00:00
build-aux po: minimize & canonicalize translations stored in git 2018-04-19 11:11:08 +01:00
docs docs: news: Explain iommu_support improvement 2018-06-05 09:11:29 +02:00
examples lxc: allow use of lxc:///system URI as preferred format 2018-04-12 16:52:01 +01:00
gnulib Update to latest gnulib 2018-03-12 11:27:54 +00:00
include/libvirt Introduce virConnectBaselineHypervisorCPU public API 2018-05-28 15:58:05 +02:00
m4 configure: Require GnuTLS 2018-06-05 14:32:03 +02:00
po po: delete bogus translations from various languages 2018-04-30 10:40:58 +01:00
src qemu: remove pointless connect retry logic in agent 2018-06-05 17:30:57 +01:00
tests qemu: don't retry connect() if doing FD passing 2018-06-05 17:30:57 +01:00
tools virsh: Introduce new hypervisor-cpu-baseline command 2018-05-28 15:59:10 +02:00
.color_coded.in Add color_coded support 2017-05-09 09:51:11 +02:00
.ctags maint: Make ctags work out of the box 2013-07-18 08:47:21 +02:00
.dir-locals.el build: avoid tabs that failed syntax-check 2012-09-06 09:43:46 -06:00
.gitignore po: minimize & canonicalize translations stored in git 2018-04-19 11:11:08 +01:00
.gitmodules gnulib: switch to use https:// instead of git:// protocol 2018-03-19 16:32:34 +00:00
.gitpublish git: add config file telling git-publish how to send patches 2018-04-23 11:36:09 +01:00
.mailmap mailmap: set preferred spelling for my name 2018-01-25 09:42:27 +00:00
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ABOUT-NLS po: provide custom make rules for po file management 2018-04-19 10:35:58 +01:00
AUTHORS.in AUTHORS: Add myself to the list of committers 2018-03-05 13:45:21 +03:00
autogen.sh po: provide custom make rules for po file management 2018-04-19 10:35:58 +01:00
bootstrap Update to latest gnulib 2018-03-12 11:27:54 +00:00
bootstrap.conf virrandom: Make virRandomBits better 2018-06-05 10:31:19 +02:00
cfg.mk syntax-check: Prohibit canonicalize_file_name() 2018-05-03 18:23:30 +02:00
ChangeLog-old Fix typos in src/* 2014-04-21 16:49:08 -06:00
config-post.h Deprecate GNUTLS_GCRYPT 2018-05-16 10:40:40 +02:00
configure.ac configure: Require GnuTLS 2018-06-05 14:32:03 +02:00
COPYING maint: follow recommended practice for using LGPL 2013-05-20 14:15:21 -06:00
COPYING.LESSER maint: Remove control characters from LGPL license file 2015-09-25 09:16:24 +02:00
libvirt-admin.pc.in Add libvirt-admin library 2015-06-16 13:46:20 +02:00
libvirt-lxc.pc.in Add pkg-config files for libvirt-qemu & libvirt-lxc 2014-06-23 16:17:27 +01:00
libvirt-qemu.pc.in Add pkg-config files for libvirt-qemu & libvirt-lxc 2014-06-23 16:17:27 +01:00
libvirt.pc.in Add pkg-config files for libvirt-qemu & libvirt-lxc 2014-06-23 16:17:27 +01:00
libvirt.spec.in spec: Fix requirement for "tc" on new distros 2018-06-01 17:38:37 +02:00
Makefile.am docs: Call reformat-news.py with $(PYTHON) 2018-03-14 12:00:27 +01:00
Makefile.nonreentrant Remove backslash alignment attempts 2017-11-03 13:24:12 +01:00
mingw-libvirt.spec.in mingw: Use Python 3 for building 2018-03-20 14:03:22 +01:00
README Provide a useful README file 2017-05-22 17:01:37 +01:00
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run.in Add PKG_CONFIG_PATH to run.in script. 2014-06-26 14:32:35 +01:00

Build Status CII Best Practices

Libvirt API for virtualization

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.

For some of these hypervisors, it provides a stateful management daemon which runs on the virtualization host allowing access to the API both by non-privileged local users and remote users.

Layered packages provide bindings of the libvirt C API into other languages including Python, Perl, PHP, Go, Java, OCaml, as well as mappings into object systems such as GObject, CIM and SNMP.

Further information about the libvirt project can be found on the website:

https://libvirt.org

License

The libvirt C API is distributed under the terms of GNU Lesser General Public License, version 2.1 (or later). Some parts of the code that are not part of the C library may have the more restrictive GNU General Public License, version 2.1 (or later). See the files COPYING.LESSER and COPYING for full license terms & conditions.

Installation

Libvirt uses the GNU Autotools build system, so in general can be built and installed with the usual commands. For example, to build in a manner that is suitable for installing as root, use:

$ ./configure --prefix=/usr --sysconfdir=/etc --localstatedir=/var
$ make
$ sudo make install

While to build & install as an unprivileged user

$ ./configure --prefix=$HOME/usr
$ make
$ make install

The libvirt code relies on a large number of 3rd party libraries. These will be detected during execution of the configure script and a summary printed which lists any missing (optional) dependencies.

Contributing

The libvirt project welcomes contributions in many ways. For most components the best way to contribute is to send patches to the primary development mailing list. Further guidance on this can be found on the website:

https://libvirt.org/contribute.html

Contact

The libvirt project has two primary mailing lists:

Further details on contacting the project are available on the website:

https://libvirt.org/contact.html