520eb3e15b
This is brand new way of closing FDs before exec(). We need to close all FDs except those we want to explicitly pass to avoid leaking FDs into the child. Historically, we've done this by either iterating over all opened FDs and closing them one by one (or preserving them), or by iterating over an FD interval [2 ... N] and closing them one by one followed by calling closefrom(N + 1). This is a lot of syscalls. That's why Linux kernel developers introduced new close_from syscall. It closes all FDs within given range, in a single syscall. Since we keep list of FDs we want to preserve and pass to the child process, we can use this syscall to close all FDs in between. We don't even need to care about opened FDs. Of course, we have to check whether the syscall is available and fall back to the old implementation if it isn't. Signed-off-by: Michal Privoznik <mprivozn@redhat.com> Reviewed-by: Ján Tomko <jtomko@redhat.com> Reviewed-by: Kristina Hanicova <khanicov@redhat.com> |
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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:
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 2.0 (or later). See the files COPYING.LESSER and COPYING for full license terms & conditions.
Installation
Instructions on building and installing libvirt can be found on the website:
https://libvirt.org/compiling.html
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:
- libvirt-users@redhat.com (for user discussions)
- libvir-list@redhat.com (for development only)
Further details on contacting the project are available on the website: