A disabling repair mode drops SO_REUSEADDR.

We can set SO_REUSEADDR after disabling repair mode, but
a small race window exists in this case.
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Stupid misprint
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

For debugging
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

* Don't dumplicate array when sending to parasite
* Allocate necessary space in cr-dump for local fds/flags
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Otherwise we can get stuck waiting for more data in vain.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

The value in eax is positive on error. Callers expect it to
be negative to report error.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

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

Currently peer is %d, but this is wrong. It should be paired
with inode easily.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

fd is shown in %d
flags are shown in %#o
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Stanislav Kinsbursky <skinsbursky@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

New custom specificator:

'S': output as string (unprintable characters replaced by dots)
Signed-off-by: Stanislav Kinsbursky <skinsbursky@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

So try to check on extra descriptors a few times

v2: move save_fds in a loop
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

It will be used for checking tcp connections, external unix sockets, etc
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

* Delete internal buffer, all data are written immediately in a log file
* Add timestamp and pid in a message
* All processes write log messages in one file
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

It's now quite simple. It's better to open-code one.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Just save the ii->ie on stack and do s/ii->ie/ie/ over the fn.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

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

After previous rework (513dde00) they are no longer needed.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Move logic from run_unix_connections to post_open().

I don't fix indents in this patch for easy reviewing.
They are fixed in the next patch.
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

All sockets are created with SO_REUSEADDR, it's needed for restoring.
E.g.: A listen socket is created after a connected socket. Both of them
are binded to one port.

So SO_REUSEADDR should be restored, when all sockets on a port were created.

This code creates a structure for each port of one type of sockets
and accounts a number of sockets, which are not restored yet.

Sockets have a hook post_open(), in which it waits when all sockets for
a defined port would be created and then it will restore SO_REUSEADDR.

struct port contains a type (udp, tcp, etc) and a port number.
It doesn't contain family or addr, because it's extra loads of logic,
which doesn't bring a significant profits.

v2: fix according with comments from Pavel
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

It will be used for restoring inet sockets. An inet socket is created with
the option REUSEADDR, because the restore logic requires this.
The origin value can be restored only when all sockets were restored.
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Now we can at least look into images manually to check how
rings are dumped. Later we should write an auto test.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

There's no way (currently) to check that the ring got restored.
Will do it once we implement mapping of a packet socket and
tcpdump app test.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

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

This one may be present and may be not, thus it's optional in the image.
The C-binding we use report the field absense in the parsed stream via
the has_xxx field, but in the google docs it's stated, that

	"When a message is parsed, if it does not contain an optional
	 element, the corresponding field in the parsed object is set
	 to the default value for that field."

Thus, I also declare the default value for it to be not zero as 0 is
a valid fanout configuration.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

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

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

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

If a vdso page was not accessed before dump, it's not present
and now it doesn't save in a dump image.
The vdso area is restored as VMA_ANON, it isn't an actual vdso more,
so when a not-present vdso page is accessed, a zero page would be mapped.

For this reason we should save all vdso pages in a image.

v2: make code more clear
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Don't need to wait external sockets, they should exist.
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Long time ago the conn jobs were implemented in a bad
manner -- they tried to connect to peer until it succeeds
sleeping in the middle.

Time to stop doing so and switch to proper futex-based
waiting for bound event.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

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

It's unclear why we've had two different names
for same argument. Moreover, "tsk" is definitely
misnamed feature.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

These are used by single process, no need in keeping them in
such a strange way. Plus, turn this array into a hash table
for better search.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

This one allocates a memory, that will be shared (MAP_SHARED)
between all the subsequent children. This can now be just used
for fd resote, later it will be required at inet socket port
binding.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

The implementation is rather straightforward. One thing to note
is that non-single membership of each type is not supported. It
can be done, but I'm unaware of any software doing so.

Note: the pb show routine should be tuned to support showing bytes.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>