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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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Daniel P. Berrange 407a281a8e Revert "Prevent more compiler optimization of mockable functions" 
This reverts commit e4b980c853.

When a binary links against a .a archive (as opposed to a shared library),
any symbols which are marked as 'weak' get silently dropped. As a result
when the binary later runs, those 'weak' functions have an address of
0x0 and thus crash when run.

This happened with virtlogd and virtlockd because they don't link to
libvirt.so, but instead just libvirt_util.a and libvirt_rpc.a. The
virRandomBits symbols was weak and so left out of the virtlogd &
virtlockd binaries, despite being required by virHashTable functions.

Various other binaries like libvirt_lxc, libvirt_iohelper, etc also
link directly to .a files instead of libvirt.so, so are potentially
at risk of dropping symbols leading to a later runtime crash.

This is normal linker behaviour because a weak symbol is not treated
as undefined, so nothing forces it to be pulled in from the .a You
have to force the linker to pull in weak symbols using -u$SYMNAME
which is not a practical approach.

This risk is silent bad linkage that affects runtime behaviour is
not acceptable for a fix that was merely trying to fix the test
suite. So stop using __weak__ again.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2017-07-13 13:07:06 +01:00
.gnulib@ce4ee4cbb5 maint: update to latest gnulib 2017-06-14 11:19:18 +01:00
build-aux Revert "Prevent more compiler optimization of mockable functions" 2017-07-13 13:07:06 +01:00
daemon fdstream: Report error from the I/O thread 2017-07-11 08:41:01 +02:00
docs news: qemu platform serial devices now use -chardev 2017-07-12 09:38:43 -04:00
examples apparmor, libvirt-qemu: Allow access to certificates used by libvirt-vnc 2017-06-16 10:38:52 +02:00
gnulib build: drop hack for old mingw ssize_t 2016-07-12 08:57:13 -06:00
include/libvirt virStream*All: Report error if a callback fails 2017-07-11 09:33:12 +02:00
m4 configure: fix typo in nss error message 2017-07-10 10:00:43 +02:00
po storage: Split out virStorageSource accessors to separate file 2017-07-11 17:07:04 +02:00
src Revert "Prevent more compiler optimization of mockable functions" 2017-07-13 13:07:06 +01:00
tests tests: add virjsondata to EXTRA_DIST 2017-07-13 10:46:38 +01:00
tools Use unsigned timeout in cmdMigrateSetMaxDowntime 2017-07-10 10:23:45 -04:00
.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 Add YouCompleteMe support 2017-05-09 09:51:11 +02:00
.gitmodules util: switch over to use keycodemapdb GIT submodule 2017-04-25 21:14:18 +01:00
.mailmap maint: update .mailmap for recent contributions 2015-03-20 06:17:55 -06:00
.travis.yml CI: show the log in case of failure 2017-05-25 08:58:39 +02:00
.ycm_extra_conf.py.in Add YouCompleteMe support 2017-05-09 09:51:11 +02:00
AUTHORS.in Change maintainers list 2016-02-12 13:10:05 +03:00
autogen.sh autogen.sh: Improve and generalize 2017-04-25 09:52:37 +02:00
bootstrap maint: update to latest gnulib 2017-01-10 12:54:54 -06:00
bootstrap.conf hvsupport: use a regex instead of XML::XPath 2016-07-19 18:42:44 +02:00
cfg.mk HACKING: Drop from the git repository 2017-06-26 14:25:54 +02:00
ChangeLog-old Fix typos in src/* 2014-04-21 16:49:08 -06:00
config-post.h Require use of GCC 4.4 or CLang compilers 2017-07-11 13:57:11 +01:00
configure.ac Post-release version bump to 3.6.0 2017-07-05 06:34:08 -04:00
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: Use HTTPS instead of HTTP 2017-05-11 18:35:45 +02:00
Makefile.am HACKING: Drop from the git repository 2017-06-26 14:25:54 +02:00
Makefile.nonreentrant cfg.mk: use a single regex for all non-reentrant functions 2016-06-15 15:00:56 +02:00
mingw-libvirt.spec.in spec: Use HTTPS instead of HTTP 2017-05-11 18:35:45 +02:00
README Provide a useful README file 2017-05-22 17:01:37 +01:00
README-hacking HACKING: Drop from the git repository 2017-06-26 14:25:54 +02:00
README.md HACKING: Drop from the git repository 2017-06-26 14:25:54 +02:00
run.in Add PKG_CONFIG_PATH to run.in script. 2014-06-26 14:32:35 +01:00
TODO Update todo list file to point at bugzilla/website 2010-10-13 16:45:26 +01:00

README.md

Build Status

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