mirror of
https://gitlab.com/libvirt/libvirt.git
synced 2024-12-24 06:35:24 +00:00
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.
49c1a078c2
There is a lot to explain, but I try to make it as short as possible. I'd start by pasting some parts of sys/stat.h: extern int stat (const char *__restrict __file, struct stat *__restrict __buf) __THROW __nonnull ((1, 2)); extern int __REDIRECT_NTH (stat, (const char *__restrict __file, struct stat *__restrict __buf), stat64) __nonnull ((1, 2)); __extern_inline int __NTH (stat (const char *__path, struct stat *__statbuf)) { return __xstat (_STAT_VER, __path, __statbuf); } Only one of these is effective at once, due to some usage of the mess we are dealing with in here. So, basically, while compiling or linking stat() in our code can be transformed into some other func. Or a dragon. Now, if you read stat(2) manpage, esp. "C library/kernel differences" section, you'll learn that glibc uses some tricks for older applications to work. I haven't gotten around actual code that does this, but based on my observations, if 'stat' symbol is found, glibc assumes it's dealing with ancient application. Unfortunately, it can be just ours stat coming from our mock. Therefore, calling stat() from a test will end up in our mock. But since glibc is not exposing the symbol anymore, our call of real_stat() will SIGSEGV immediately as the pointer to function is NULL. Therefore, we should expose only those symbols we know glibc has. Signed-off-by: Michal Privoznik <mprivozn@redhat.com> |
||
---|---|---|
.gnulib@6cc32c63e8 | ||
build-aux | ||
daemon | ||
docs | ||
examples | ||
gnulib | ||
include/libvirt | ||
m4 | ||
po | ||
src | ||
tests | ||
tools | ||
.ctags | ||
.dir-locals.el | ||
.gitignore | ||
.gitmodules | ||
.mailmap | ||
AUTHORS.in | ||
autobuild.sh | ||
autogen.sh | ||
bootstrap | ||
bootstrap.conf | ||
cfg.mk | ||
ChangeLog-old | ||
config-post.h | ||
configure.ac | ||
COPYING | ||
COPYING.LESSER | ||
HACKING | ||
libvirt-admin.pc.in | ||
libvirt-lxc.pc.in | ||
libvirt-qemu.pc.in | ||
libvirt.pc.in | ||
libvirt.spec.in | ||
Makefile.am | ||
Makefile.nonreentrant | ||
mingw-libvirt.spec.in | ||
README | ||
README-hacking | ||
run.in | ||
TODO |
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>