dump: Unlock network if -R option passed

It's been found that if -R (leave task running after checkpoint)
option passed we don't unlock network, nether we clean service
files (such as link remaps).

After a long discussion we choose the following path: if -R option
is passed, it means a user is quite confident in what he is doing
and consistency of the resources (file system) is achieved by
a user himself with help of post-dump script. Also a user knows
that the network will be unlocked and accept such case.

So here we check of -R being passed in command line and once
checkpoint complete we unlock the network.

Cleaning up of link remaps is addressed in another patch.

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
dump: Don't forget to cleanup link remap if needed

In case if checkpoint is failed or -R option passed
we need to remove link remap files created during
dump procedure.

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
docs: Document -R|--leave-running option

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
ptrace: Introduce get/set regs helpers

Required for simpler next patching.

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
parasite-syscall: use the ptrace requests PTRACE_(GET|SET)REGSET to retrieve and set CPU registers

This patch introduces the routines ptrace_get_gpregs() and ptrace_set_gpregs()
that wrap the ptrace interface to get and set CPU registers respectively.
The motivation is to make the CRIU code be compatible with architectures that
don't support the PTRACE_GETREGS and PTRACE_SETREGS ptrace calls ---
the requests PTRACE_GETREGSET and PTRACE_SETREGSET are implemented instead.

Signed-off-by: Alexander Kartashov <alekskartashov@parallels.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
sigframe: introduced the macros to access the FPU state

An fpu_state_t instance shouldn't be stored in an ARM sigframe
that makes it necessary to generalize the way the FPU state is
accessed in the routine construct_sigframe()

Signed-off-by: Alexander Kartashov <alekskartashov@parallels.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
cr: identify LDARCH and ARCH by default

Signed-off-by: Alexander Kartashov <alekskartashov@parallels.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
arm: fixed AArch64 syscall numbers

It turned out that AArch64 uses the UAPI syscall numbering scheme
that is incompatible with x86. Unfortunately this kills the idea
of the unified syscall table and syscall generator.

Note that the following syscalls:

* open,
* mkdir,
* rmdir,
* unlink,

are declared obsolete in the UAPI. Moreover the syscall arch_prctl
doesn't exist in the UAPI.

Signed-off-by: Alexander Kartashov <alekskartashov@parallels.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
arm: restore the VFP sigframe field fpscr properly

The routine restore_fpu() contains two bugs:

1) it reads more bytes from the array ThreadInfoArm::fpstate::vfp_regs
   than it actually containes;

2) the value of the field ThreadInfoArm::fpstate::fpscr is dropped
   on the floor.

Signed-off-by: Alexander Kartashov <alekskartashov@parallels.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
arm: initialize the ARM VFP header in the routine restore_fpu()

The ARM VFP header is a part of the VFP frame that makes
it unreasonable to have frame initialization split into
two routines. This patch moerges the ARM version of
the routine sigreturn_prep_fpu_frame() into restore_fpu()
and reduces the former into a stub.

Signed-off-by: Alexander Kartashov <alekskartashov@parallels.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
arm: kill fpu_state_t

It has been a mistake to introduce this struct since the FPU state
is stored deep inside an ARM sigframe. A remnant of the struct
is left to make the code compatible with the universal declaration
of the routine sigreturn_prep_fpu_frame().

Signed-off-by: Alexander Kartashov <alekskartashov@parallels.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Documnetation: added the HOWTO on cross-compilation

Signed-off-by: Alexander Kartashov <alekskartashov@parallels.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
docs: Add 'service' command description

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
v3 service: SIGCHLD handler

Hi!

Now we're ignoring SIGCHLD from forked children.
This patch provides SIGCHLD handler, that will wait for child and write some
information about it's exit status to logfile.

Signed-off-by: Ruslan Kuprieiev <kupruser@gmail.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
util: Update kdev_to_odev to respect BITS_PER_LONG

Depending on BITS_PER_LONG userspace representation of dev_t
may vary, so we need to choose proper encoding.

Signed-off-by: Igor Sukhih <igor@parallels.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
rst: Introduce an engine to allocate memory on restore

On restore we need differetn types of memory allocation.
Here's an engine that tries to generalize them all. The
main difference is in how the buffer with objects is being
grown up.

There are 3 types of memory allocations:

1. shared memory -- objects, that will be used by all criu
   children, but will not reach the restorer
2. shared remapable -- the same, but restorer would need
   access to them, i.e. -- buffer with objects will get
   remapped into restorer
3. private -- the same, but allocatedby each task for itself

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
rst: Switch shmalloc allocator to use rst-malloc

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
rst: Switch private rst-mem allocator on generic rst-malloc

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
rst: Make shmem restore to use rst-malloc

This actually fixes a bug -- memory for shmem info was
not allocated dynamically, thus we were limited in the
amount of shmems to be restored.

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