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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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Eric Blake dbb5b6cfb9 storage: avoid short reads while chasing backing chain 
Our backing file chain code was not very robust to an ill-timed
EINTR, which could lead to a short read causing us to randomly
treat metadata differently than usual.  But the existing
virFileReadLimFD forces an error if we don't read the entire
file, even though we only care about the header of the file.
So add a new virFile function that does what we want.

* src/util/virfile.h (virFileReadHeaderFD): New prototype.
* src/util/virfile.c (virFileReadHeaderFD): New function.
* src/libvirt_private.syms (virfile.h): Export it.
* src/util/virstoragefile.c (virStorageFileGetMetadataInternal)
(virStorageFileProbeFormatFromFD): Use it.

Signed-off-by: Eric Blake <eblake@redhat.com>
(cherry picked from commit 5327fad4f2)

Conflicts:
	src/util/virstoragefile.c: OOM error reporting & buffer signedness
2014-02-18 17:07:41 +00:00
.gnulib@a363f4ed4a build: update to latest gnulib, for syntax-check 2013-05-10 20:52:57 -06:00
build-aux syntax-check: mandate space after mid-line semicolon 2013-05-28 08:26:05 -06:00
daemon Fix max stream packet size for old clients 2013-10-01 13:59:12 +01:00
docs Fix minor typos in messages and docs 2014-02-18 17:07:40 +00:00
examples syntax: prefer space after semicolon in for loop 2013-05-28 07:56:07 -06:00
gnulib maint: use LGPL correctly 2013-05-20 14:03:48 -06:00
include Change virConnectDomainEventGraphicsCallback signature 2013-05-22 18:53:59 +02:00
m4 FreeBSD: disable buggy -fstack-protector-all 2013-05-15 15:20:52 -06:00
po Release of libvirt 1.0.6 2013-06-03 12:09:56 +02:00
python syntax: prefer space after semicolon in for loop 2013-05-28 07:56:07 -06:00
src storage: avoid short reads while chasing backing chain 2014-02-18 17:07:41 +00:00
tests Remove virConnectPtr arg from virNWFilterDefParse* 2014-02-06 14:48:55 +02:00
tools virsh: Fix debugging 2013-10-18 08:24:55 +02:00
.dir-locals.el build: avoid tabs that failed syntax-check 2012-09-06 09:43:46 -06:00
.gitignore maint: follow recommended practice for using LGPL 2013-05-20 14:15:21 -06:00
.gitmodules make .gnulib a submodule 2009-07-08 16:17:51 +02:00
.mailmap Autogenerate AUTHORS 2012-10-19 12:44:56 -04:00
AUTHORS.in Add John Ferlan to the committers list 2013-02-05 10:59:32 -05:00
autobuild.sh Set PKG_CONFIG_LIBDIR in autobuild.sh 2013-05-17 17:09:29 +01:00
autogen.sh build: fix incremental autogen.sh when no AUTHORS is present 2012-12-03 14:59:09 -07:00
bootstrap maint: update to latest gnulib 2013-05-08 14:54:04 -06:00
bootstrap.conf Include GNULIB mkdtemp module 2013-05-17 17:09:29 +01:00
cfg.mk syntax: fix broken error message in previous patch 2013-05-28 09:52:03 -06:00
ChangeLog-old virterror.c: Fix several spelling mistakes 2012-02-03 11:32:51 -07:00
configure.ac Add support for using 3-arg pkcheck syntax for process (CVE-2013-4311) 2013-09-18 16:30:47 +01:00
COPYING maint: follow recommended practice for using LGPL 2013-05-20 14:15:21 -06:00
COPYING.LESSER maint: follow recommended practice for using LGPL 2013-05-20 14:15:21 -06:00
HACKING Fix minor typos in messages and docs 2014-02-18 17:07:40 +00:00
libvirt.pc.in build: silence warning from autoconf 2012-05-30 09:22:02 -06:00
libvirt.spec.in Add support for using 3-arg pkcheck syntax for process (CVE-2013-4311) 2013-09-18 16:30:47 +01:00
Makefile.am maint: use LGPL correctly 2013-05-20 14:03:48 -06:00
Makefile.nonreentrant maint: use LGPL correctly 2013-05-20 14:03:48 -06:00
mingw-libvirt.spec.in test: Return Libvirt logo as domain screenshot 2013-04-02 14:38:56 +02:00
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
run.in run: license as LGPL 2013-02-23 14:03:19 -07:00
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>