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Libvirt native C API and daemons
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Richard Jones f4a43df52b Ignore SIGWINCH in remote client call to poll(2) (RHBZ#567931). 
In bug 567931 we found that virt-top would exit occasionally
when the terminal window was resized.  Tracking this down it
turned out that SIGWINCH was being delivered to the process at
exactly the point where the libvirt remote driver was calling
poll(2) waiting for a reply from libvirtd.

This caused the poll(2) call to be interrupted (returning errno
EINTR).  However handling EINTR the same way as EAGAIN was not
the solution to this problem since we found previously that this
would break Ctrl-C handling (commit 47fec8eac2).

The correct solution is to mask out SIGWINCH for the duration
of the poll(2) system call.  The per-thread mask is changed and
restored immediately after the call.  Since we are using
pthread_sigmask, this should not affect other threads, and
since we restore the signal mask immediately afterwards it should
not affect the current thread visibly either.  Other possibly
problematic signals are SIGCHLD and SIGPIPE and these are
masked too.

Note use of ignore_value: It's not fatal if we cannot mask out
SIGWINCH, and in any case pthread_sigmask never fails on Linux
as long as you supply the correct arguments.

I tested this patch and it cures the original problem with
virt-top.
2010-02-24 16:06:40 +00:00
.gnulib@11fbc57405 Format FS pools on creation 2010-02-24 09:51:34 +01:00
build-aux maint: sort .gitignore 2010-02-23 21:32:04 +01:00
daemon Wire protocol format and dispatcher for virConnectBaselineCPU 2010-02-12 14:27:20 +01:00
docs Add descriptions for macvtap direct type interfaces 2010-02-24 10:29:23 +01:00
examples maint: avoid excess parens in STREQ 2010-02-01 17:21:26 +01:00
include virConnectBaselineCPU public API 2010-02-12 14:21:58 +01:00
m4 remove all .cvsignore files 2009-07-08 16:17:51 +02:00
po maint: sort .gitignore 2010-02-23 21:32:04 +01:00
proxy Fix compile error in Xen proxy from virConnectPtr changes 2010-02-10 12:51:41 +00:00
python python: Actually add virConnectGetVersion to generated bindings 2010-02-17 16:15:57 -05:00
src Ignore SIGWINCH in remote client call to poll(2) (RHBZ#567931). 2010-02-24 16:06:40 +00:00
tests Fix daemon-conf invalid failures 2010-02-20 15:26:53 +01:00
tools virsh.c: avoid all leaks in OOM path in cmdCPUBaseline 2010-02-23 13:53:39 +01:00
.gitignore maint: sort .gitignore 2010-02-23 21:32:04 +01:00
.gitmodules make .gnulib a submodule 2009-07-08 16:17:51 +02:00
.hgignore Add qemuhelptest to .*ignore files 2009-06-16 14:06:48 +00:00
.x-sc_avoid_ctype_macros exempt gnulib from ctype-macros prohibition 2008-10-28 17:36:31 +00:00
.x-sc_avoid_if_before_free avoid a "make syntax-check" failure 2009-07-09 20:00:37 +02:00
.x-sc_avoid_write Fully asynchronous monitor I/O processing 2009-11-10 13:27:18 +00:00
.x-sc_m4_quote_check syntax-check: enable more checks 2009-02-03 13:08:36 +00:00
.x-sc_prohibit_asprintf add .x-sc_prohibit_asprintf 2008-12-23 13:40:42 +00:00
.x-sc_prohibit_gethostby Various syntax-check fixes. 2009-10-26 10:34:05 +01:00
.x-sc_prohibit_gethostname Add a new syntax-check rule for gethostname. 2009-10-26 10:34:27 +01:00
.x-sc_prohibit_have_config_h maint: sync from coreutils 2009-01-29 18:06:19 +00:00
.x-sc_prohibit_HAVE_MBRTOWC maint: sync from coreutils 2009-01-29 18:06:19 +00:00
.x-sc_prohibit_nonreentrant Tighten up nonreentrant syntax-check. 2009-10-26 10:33:42 +01:00
.x-sc_prohibit_readlink Add a rule to check for uses of readlink. 2010-01-22 09:42:35 -05:00
.x-sc_prohibit_strcmp exempt gnulib/ from "make syntax-check" strcmp prohibition 2008-05-14 21:18:27 +00:00
.x-sc_prohibit_strcmp_and_strncmp Ignore docs/ directory for strcmp() syntax check 2009-11-23 11:58:13 +00:00
.x-sc_prohibit_strncpy Various syntax-check fixes. 2009-10-26 10:34:05 +01:00
.x-sc_prohibit_VIR_ERR_NO_MEMORY Various syntax-check fixes. 2009-10-26 10:34:05 +01:00
.x-sc_require_config_h Various syntax-check fixes. 2009-10-26 10:34:05 +01:00
.x-sc_require_config_h_first Misc syntax-check fixes 2009-09-21 14:41:47 +01:00
.x-sc_trailing_blank build: exempt *.ico files from the trailing blank check 2008-10-16 13:28:07 +00:00
acinclude.m4 remove all trailing blank lines 2009-07-16 15:06:42 +02:00
AUTHORS Add Jiri Denemark <jdenemar@redhat.com> to commiters 2010-01-19 14:41:19 +01:00
autobuild.sh Enable ESX driver build on Mingw32 2009-07-31 16:15:51 +01:00
autogen.sh maint: import modern bootstrap 2010-02-23 21:31:21 +01:00
bootstrap maint: import modern bootstrap 2010-02-23 21:31:21 +01:00
bootstrap.conf maint: import modern bootstrap 2010-02-23 21:31:21 +01:00
cfg.mk build: update gnulib submodule to latest 2010-02-23 21:31:17 +01:00
ChangeLog-old generate ChangeLog from git logs into distribution tarball 2009-07-08 16:17:51 +02:00
configure.ac Format FS pools on creation 2010-02-24 09:51:34 +01:00
COPYING.LIB remove all trailing blank lines 2009-07-16 15:06:42 +02:00
HACKING Remove conn parameter from virReportOOMError 2010-02-09 01:04:54 +01:00
libvirt.pc.in * libvirt.pc.in: applied patch from Daniel Berrange to fix --cflags 2006-03-24 13:18:12 +00:00
libvirt.spec.in Format FS pools on creation 2010-02-24 09:51:34 +01:00
Makefile.am add AppArmor test and examples to dist 2009-12-14 13:40:42 +01:00
Makefile.nonreentrant syntax-check: enable prohibit_nonreentrant 2009-02-05 16:28:41 +00:00
mingw32-libvirt.spec.in Make pki_check.sh into an installed & supported tool 2009-09-21 14:41:46 +01:00
README Correct typos in the documentation (Atsushi SAKAI) 2008-01-24 10:15:13 +00:00
README-hacking build: automatically rerun ./bootstrap when needed 2009-07-10 13:39:28 +02:00
TODO Remove all trailing blanks; turn on the rule to detect them. 2008-02-05 19:27:37 +00:00

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>