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.
* .cvsignore, Makefile.am, autobuild.sh, configure.in,
mingw32-libvirt.spec.in: Import the latest MinGW libvirt spec
file. Note that the file has been renamed to conform to
new Fedora packaging guidelines.
* autobuild.sh: Fix a bug in the generation of the $EXTRA_RELEASE
field when autobuilding.
* src/virsh.c: Implement 'virsh edit', 'virsh net-edit' and
'virsh pool-edit' commands. These edit the XML for domains,
networks and storage pools respectively, and are the
equivalent of doing 'virsh dumpxml; vi foo.xml; virsh define'
* src/Makefile.am, src/.cvsignore: Auto-generate the net-edit
and pool-edit commands.
* docs/virsh.pod: Updated the documentation.
* src/domain_conf.c, src/network_conf.c, src/storage_conf.c:
Improve error messages from commands such as 'virsh define'
when the XML is not well-formed by passing libxml2 errors
back out through virterror.
* include/libvirt/libvirt.h.in, src/libvirt.c, src/driver.h,
src/libvirt_sym.version: New virDomainMemoryPeek API.
* qemud/remote.c, qemud/remote_protocol.x, src/remote_internal.c:
Support for remote.
* src/qemu_driver.c: QEMU driver implementation of API.
* src/test.c: Test driver (null) implementation of API.
* docs/hvsupport.html.in: Document API.
* libvirt.spec.in: New path /var/cache/libvirt for temporary
storage of memory images.
* qemud/libvirtd.init.in: Remove any old temp files in
/var/cache/libvirt on restarts.
* src/Makefile.am: make install creates /var/cache/libvirt.
* configure.in: Detect mkdir -p.
* configure.in: Document AC_SYS_LARGEFILE.
* docs/hvsupport.html.in: Document HV support for virDomainBlockPeek.
* include/libvirt/libvirt.h.in, src/driver.h, src/libvirt.c,
src/libvirt_sym.version: Add virDomainBlockPeek infrastructure.
* src/qemu_driver.c, src/test.c: Null versions of this call.
* src/xen_unified.c, src/xend_internal.c, src/xend_internal.h,
src/xm_internal.c, src/xm_internal.h: Xen implementation.
* tests/sexpr2xmldata/sexpr2xml-curmem.xml,
tests/sexpr2xmldata/sexpr2xml-no-source-cdrom.xml: XML output
has been reordered slightly in the Xen driver, but should be
functionally the same.
* include/libvirt/libvirt.h.in: Add VIR_DEPRECATED macro.
* src/internal.h: Internal code is allowed to use deprecated
features, so override VIR_DEPRECATED here.
* include/libvirt/virterror.h: Deprecate the conn, dom and net
fields in the _virError structure.
* configure.in: Fix pkg-config detection of libxml2,
add -lgcrypt to gnutls lib.
* src/Makefile.am: If compiling --without-libvirtd then
don't compile any part of the storage driver.
* configure.in, src/hash.c, src/internal.h: Detect availability
of pthread library and compile out mutex code if not available.
* src/storage_driver.c, src/util.c: Ignore some missing
headers on MinGW.
* src/util.c, src/util.h, src/libvirt_sym.version: Added
virMacAddrCompare utility function for comparing MAC
addresses.
* src/virsh.c, src/xm_internal.c: Use virMacAddrCompare
to compare addresses. (Shigeki Sakamoto and Richard Jones).
* configure.in: Use PortableXDR if available.
* qemud/internal.h: Use "socketcompat.h".
* qemud/qemud.c: Use <signal.h>.
* src/sexpr.c: Use <stdlib.h> instead of <malloc.h>.
* src/socketcompat.h: Include <sys/un.h> for Mac OS X.
* configure.in: xdr functions may require -lxdr.
* configure.in, src/Makefile.am: Extra linking flags for
building libvirt DLL.
* src/socketcompat.h: Hide Windows Winsock incompatibilities
in a separate header file.
* src/remote_internal.c: Switch to using socketcompat.h /
socket_errno().
* src/test.c: Switch to using socketcompat.h.
* gnulib/lib/arpa/.cvsignore: Ignore another generated file.
* src/qparams.c: Include <config.h>.
* src/qparams.c, src/qparams.h, src/Makefile.am: Added a
separate 'qparams' module for handling query parameters.
* src/remote_internal.c: Factor out query parameter code so
it uses the 'qparams' module.
* src/console.c, src/console.h, src/virsh.c: Disable
text console on Windows.
* src/libvirt.c: Use replacement getpass from Gnulib.
* src/libvirt.c: Initialize Winsock before use.
* src/remote_internal.c: Header file fixes for Windows.
Don't fail if AI_ADDRCONFIG isn't defined. Disable
unsupported stuff under Windows.
* src/uuid.c: ENODATA unavailable on Windows, use EIO instead.
* src/virsh.c: No uid_t / getuid on Windows.
* src/virsh.c: No O_SYNC on Windows.
* src/.cvsignore: Ignore *.loT files (generated under Windows).
* proxy/libvirt_proxy.c: Bail out earlier --without-xen.
* src/proxy_internal.c: Don't build proxy client side if
configured --without-xen.
* src/iptables.c, src/iptables.h: Disable this code if
configured --without-qemu.
* src/nodeinfo.c: If no 'uname' function, set model name to
empty string (for Windows).
* src/xen_unified.h, src/util.c, src/test.c: Include <winsock2.h>
on Windows.
* src/util.c: Disable virExec* and virFileLinkPointsTo on
MinGW.
* python/libvir.c, python/libvirt_wrap.h, qemud/qemud.c,
qemud/remote.c, src/internal.h, src/openvz_conf.c,
src/openvz_driver.c, src/proxy_internal.h, src/qemu_conf.c,
src/qemu_driver.c, src/remote_internal.h, src/test.h, src/util.c,
src/xen_unified.c, src/xen_unified.h, tests/nodeinfotest.c,
tests/qemuxml2argvtest.c, tests/qemuxml2xmltest.c, tests/reconnect.c,
tests/sexpr2xmltest.c, tests/virshtest.c, tests/xencapstest.c,
tests/xmconfigtest.c, tests/xml2sexprtest.c:
Change #include <> to #include "" for local includes.
Removed many includes from src/internal.h and put them in
the C files which actually use them.
Removed <ansidecl.h> - unused.
Added a comment around __func__.
Removed a clashing redefinition of VERSION symbol.
All limits (PATH_MAX etc) now done in src/internal.h, so we
don't need to include those headers in other files.
* configure.in: curses is not actually required to build libvirt
* configure.in, src/virsh.c: Make readline optional. If not
available then virsh is built without support for command
line editing.
* python/libvir.c, python/libvir.py: Make Python aware that
the C bindings module is called cygvirtmod.dll when compiled
by CYGWIN.
* python/Makefile.am: Remove symlink libvirtmod.dll -> cygvirtmod.dll
no longer necessary because of the above.
* configure.in: Remove AM_CONDITIONAL(CYGWIN).
* configure.in: Added CYGWIN_EXTRA_LDFLAGS, CYGWIN_EXTRA_LIBADD,
CYGWIN_EXTRA_PYTHON_LIBADD, CYGWIN automake conditional.
* src/Makefile.am: Extra flags required to build DLL of libvirt
for Cygwin.
* python/Makefile.am: Extra flags and rule required to build
Python module for Cygwin.
* tests/Makefile.am, tests/nodeinfotest.c, tests/qemuxml2argvtest.c,
tests/qemuxml2xmltest.c, tests/sexpr2xmltest.c, tests/virshtest.c,
tests/xencapstest.c, tests/xmconfigtest.c, tests/xml2sexprtest.c:
Miscellaneous fixes to the tests to compile under Cygwin.
Richard Jones