For now we only support ESTABLISHED state, so this is mostly
a preparation for the future extention.
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

With window parameters, we have stuff to restore before
queues and after queues.
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

In TCP repair some stuff should be restored before calling
connect/bind on socker and some -- after it.
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

As an API for dumping and restoring the data the structure
with __u32-s is used. Getting one (and restoring) also involve
the size of the structure so that both -- caller and library --
can know which "version" of it the other one is using.

As a starting point all the fields that tcp_entry carries are
used.

Also note, that only tcp connection info is handled by the
library. Stuff like addresses and ports, socket options and
other are left for the caller to care for.
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

The calls put socket into a mode where it can be saved or
restored. Add take one out of this mode.

TODO: In criu we turn repair off (resume the socket) from
restorer blob that cannot use the library. Need to somehow
fix it.
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

In order to get messages from libsoccr I propose to
introduce a printing callback that can be set by library
user and that will be called by libsoccr.
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

For now build the .a library not to produce criu wrappers.
Next version should include the .so library as well.
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

Function has unsigned int return value, and error is coded by 0, not -1.

travis-ci: success for ns: Fix error return value in __get_ns_id()
Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

The man page says, it's not optional argument:
  The application shall ensure that the infop argument
  points to a siginfo_t structure.

Fixes:
Test output: ================================
17:40:26.128:     5: FAIL: helper_zombie_child.c:33: waitid (errno = 14 (Bad address))
17:40:26.128:     4: FAIL: helper_zombie_child.c:78: read (errno = 2 (No such file or directory))
17:40:26.129:     3: ERR: test.c:229: Test exited unexpectedly with code 1

Test output: ================================
15:30:49.021:    30: ERR: sigpending.c:213: waitid (errno = 14 (Bad address))
15:30:49.021:    29: ERR: test.c:229: Test exited unexpectedly with code 1

and etc.

travis-ci: success for 32-bit tests fixes
Signed-off-by: Dmitry Safonov <dsafonov@virtuozzo.com>
Acked-by: Tycho Andersen <tycho.andersen@canonical.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

For ZDTM purposes, poll.c uses delta of 5 seconds, which is fine, since
tests don't take a very long time to pass. However, in vzt-cpt, we start
a batch with multitude of tests and starting them all could take over an
hour. Hence, the test is bound to fail. An easy solution would be to
introduce an environment variable, which would allow to specify the
delta - ZDTM_DELTA. If it's unset (which is default behaviour in ZDTM) -
it would default to 5 seconds. However, if it's set (what we can do from
vzt-cpt) - then it will use delta which is set by our test.

travis-ci: success for test: add variable delta for poll.c test (rev2)
Signed-off-by: Vitaly Ostrosablin <vostrosablin@virtuozzo.com>
Reviewed-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

CID 173737 (#1 of 2): Resource leak (RESOURCE_LEAK)
9. leaked_handle: Handle variable rmntns_root going out of scope leaks the handle.

travis-ci: success for files: don't leak a file descriptor
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

When splicing page server data from UNIX socket we may get
error (EAGAIN) from splice if no data is available on the
socket yet. This is because the SPLICE_F_NONBLOCK flag is
checked by af_unix.c in the kernel to decide whether or
not to do blocking read.

This is not symmetrical with TCP sockets, which only check
for the socket's O_NONBLOCK flag for the same decicion.

Dropping the SPLICE_F_NONBLOCK flag is not possible too, as
otherwise we'll block on the pipe when trying to put data
into it. Even if part of the data fits into it kernel would
block anyway untill full buffer is in. And there will be
no read() from the pipe, as it should happen one step later
in the same task.

So to untie this, we need to wait for the data explicitly
with poll().
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

A unix socket can be bound to itself, so we need only one socket
instead of a pair of pipe.

If we use a socket, we can peek a message and if it isn't for us
we don't need to send it back.

Currently a process reads message from pipe, if it isn't for him,
it sends it back and sleeps for a random timeout. In a worst case
each waiter will read and send a message back, before the right
one will get it.

travis-ci: success for series starting with [1/3] zdtm: call test_init() before doing anything
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

travis-ci: success for series starting with [1/3] zdtm: call test_init() before doing anything
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

test_init() has to be executed first, because it prepares a container.

travis-ci: success for series starting with [1/3] zdtm: call test_init() before doing anything
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

travis-ci: success for Fetch mmap_minimal_address and drop MAP_ANON
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

We assume that mmap_minimal_address with non-default
setting is not widespread but it's not true. Instead
lets fetch this setting runtime.

travis-ci: success for Fetch mmap_minimal_address and drop MAP_ANON
Signed-off-by: Cyrill Gorcunov <gorcunov@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

This one covers the following cases:
* socket is bound to an interface
* socket isn't bound to an interface

https://github.com/xemul/criu/issues/73
travis-ci: success for series starting with [1/2] socket: Add support for SOCK_PACKET sockets
Signed-off-by: Gleb Valin <the7winds@yandex.ru>
Signed-off-by: Eugene Batalov <eabatalov89@gmail.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

If socket type is SOCK_PACKET it restores binding with proper address structure.

https://github.com/xemul/criu/issues/73
travis-ci: success for series starting with [1/2] socket: Add support for SOCK_PACKET sockets
Signed-off-by: Gleb Valin <the7winds@yandex.ru>
Signed-off-by: Eugene Batalov <eabatalov89@gmail.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

Test seem to assume that zdtm lib directory is on PATH, but if it's not
- calling for parseargs.sh would fail (if cwd is static). Therefore,
this patch changes this to ../lib/parseargs.sh which should be fine both
for zdtm and vzt-cpt.

travis-ci: success for test: fix shell script tests (conntracks & route_rules)
Signed-off-by: Vitaly Ostrosablin <vostrosablin@virtuozzo.com>
Reviewed-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

Compiling zdtm on the latest Fedora rawhide gives errors like this:

ns.c: In function ‘prepare_mntns’:
ns.c:122:13: error: In the GNU C Library, "makedev" is defined
 by <sys/sysmacros.h>. For historical compatibility, it is
 currently defined by <sys/types.h> as well, but we plan to
 remove this soon. To use "makedev", include <sys/sysmacros.h>
 directly. If you did not intend to use a system-defined macro
 "makedev", you should undefine it after including <sys/types.h>. [-Werror]
   if (mknod("/dev/ptmx", 0666 | S_IFCHR, makedev(5, 2)) == 0) {
             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors

This commit fixes those errors.

travis-ci: success for zdtm: fix '"makedev" is defined by <sys/sysmacros.h>'
Signed-off-by: Adrian Reber <areber@redhat.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

When going daemon criu services ask cr_daemon() to keep
some descriptors open and the routine dup2-s them. The
problem is that the original descriptor is left where it
was and is leaked.

travis-ci: success for util: Do not leak dup-ed file descriptor
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

The idea of this test is to check non-root shared mounts
which lives in a few shared groups.

v2: fix the link description.

travis-ci: success for test: check non-root shared mounts (rev2)
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

Most of the rest code uses int nr, so ...
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>
Acked-by: Mike Rapoport <rppt@linux.vnet.ibm.com>

The PagemapEntry and struct iovec are quite interchangeable.
PagemapEntry can be used directly in the few places that converted it to
struct iovec.
The only place that used iovec2pagemap can be switched to open-coded
assignments without really hurting code readability.

travis-ci: success for pagemap: minor cleanups (rev2)
Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

travis-ci: success for pagemap: minor cleanups (rev2)
Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

CID 172196, issues/233.

The advance method can keep pr->pe NULL while the rest of
the code doesn't count on that.
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>
Acked-by: Mike Rapoport <rppt@linux.vnet.ibm.com>

Now it's obsoleted by the advance method.
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>
Acked-by: Mike Rapoport <rppt@linux.vnet.ibm.com>

We have pr->pe with the same data available widely, no need
to copy this thing twice.
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>
Acked-by: Mike Rapoport <rppt@linux.vnet.ibm.com>

The only external users of ->seek_page method are page-xfer and uffd and
both of them are anyway interested in the entire pagemap rather than a
particular page.
The added 'skip_zero' parameter allows proper detection of zero pagemaps by
uffd.
Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

The return value of seep_pagemap_page can be either 1 (page found) or 0 (no
page found). There's no point in checking its return value for -1.
Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

travis-ci: success for uffd: A new set of improvements
Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

Since commit 95009c4c6d5 (criu: pagemap: introduce advance() helper for
pagemap iteration) seek_pagemap_page traverses the entire pagemap, rather
than starts each time from the last pagemap that was used.
With large pagemaps (like, e.g. in maps05 case) the new behavior causes
exponential increase in amount of calls to skip_pagemap_page for every new
snapshot.
Let's restore the original behavior.

Fixes: #217
Reported-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

travis-ci: success for series starting with [01/21] build: install libnet-dev
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>