zdtm: Add fifo-rowo-pair test case

I need a special test case where fake
fifo will be created by us to restore
the former.

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
zdtm: Add fifo ghost file test

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Acked-by: Andrey Wagin <avagin@gmail.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
zdtm: Enable fifo and fifo_wronly tests

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

Don't push open cb onto reg_file_into, pass it into regfiles engine
as an argument.

Note: I haven't merged the fifo zdtms yet, thus this patch is untested.

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Tested-by: Cyrill Gorcunov <gorcunov@openvz.org>
pipes: Cleanup pipe data collecting code

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
zdtm: copy futex engine from crtools (v2)

We can't reuse it from crtools, because zdtm is used separately.

v2 syscall() returns an error code in errno.

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
zdtm: add ability to set id of a test proccess

It's just easy for debugging

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
zdtm: add a test case for checking sid and pgid

A process tree is described in the array. New cases are easy for adding.

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
restore: wait while restroring pgid (v2)

Pgid leader should become such before any other task tries
to enter this group (with setpgid). Thus we introduce a yet
another global sync point -- before it all pgid leaders call
setpgid after it all the others do it.

v2: wait while helpers restored pgid

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
restore: restore pgid in two phases

As described in the previous patch, process group leaders are restored in
the first phase, then all other processes restores pgid.

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
restore: create fake process group leaders

Just like for orphaned sessions, create a fake task for orphaned pgids.

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
zdtm: fifo-rowo-pair test update

Address Andrew's comments

 - use TEST_VALUE macro instead of open coded value
 - use WIFx macros for child status testing
 - kill child/parent on error

Note that it was not clear from an initiall patch
change log -- the difference between fifo_wronly
test case and this one is that we use fork() call
here which allow us to make sure that fifo restoration
code logic will be tested more widely.

Basically the flowchart of the test case:

parent				child
------				-----
open RW fifo (slave)
open RO fifo (master)
				open WO fifo (master)
				dup parent slave to slave1

				... waiting c/r to happen ...
				... waking up from c/r ...

				send bytes to master
				send bytes to slave1

				finish
... initiating c/r ...
... waking up from c/r ...

read bytes from master
read bytes from slave

PASS :D

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