This is achieved by supplying the callback. Every time a notification
arrives the callback is called. Return value of 0 means continue,
any other value aborst the request and the value is reported back
to the caller (from criu_dump/criu_restore calls).
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
It fully uses the swrk action of criu. The problems, that caller may
have is that the restored tasks die _before_ libcriu's call returns.
v2:
* rename _sub to _child
* unblock sigchild before execl-ing criu
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
The --exec-cmd option specifies a command that will be execvp()-ed on successful
restore. This way the command specified here will become the parent process of
the restored process tree.
Waiting for the restored processes to finish is responsibility of this command.
All service FDs are closed before we call execvp(). Standad output and error of
the command are redirected to the log file when we are restoring through the RPC
service.
This option will be used when restoring LinuX Containers and it seems helpful
for perf or other use cases when restored processes must be supervised by a
parent.
Two directions were researched in order to integrate CRIU and LXC:
1. We tell to CRIU, that after restoring container is should execve()
lxc properly explaining to it that there's a new container hanging
around.
2. We make LXC set himself as child subreaper, then fork() criu and ask
it to detach (-d) from restore container afterwards. Being a subreaper,
it should get the container's init into his child list after it.
The main reason for choosing the first option is that the second one can't work
with the RPC service. If we call restore via the service then criu service will
be the top-most task in the hierarchy and will not be able to reparent the
restore trees to any other task in the system. Calling execve from service
worker sub-task (and daemonizing it) should solve this.
Signed-off-by: Deyan Doychev <deyandoichev@gmail.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
This function implements the --root command line option in libcriu.
Signed-off-by: Deyan Doychev <deyandoichev@gmail.com>
Reviewed-by: Ruslan Kuprieiev <kupruser@gmail.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
The top-level makefile defines an ARCH_DIR variable. Always use
it rather than referencing ARCH directly, since ARCH may be set
by the user on the command line and that raw input may not be
what needs to be used internally.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
A user may have necessary linker directories specified in CFLAGS.
Make sure to include them.
Change-Id: I76c2a7bd6e34cc282bfcd5f83cc69ae7fa2c8cc2
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Using a soname makes it easy for applications to
detect if the ABI of libcriu.so has changed.
It still creates libcriu.so as before in lib. During
'make install' additional links are created:
libcriu.so -> libcriu.so.1.0
libcriu.so.1 -> libcriu.so.1.0
Signed-off-by: Adrian Reber <adrian@lisas.de>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
As we've added work_dir_fd to RPC, lets add support for it to libcriu.
Signed-off-by: Ruslan Kuprieiev <kupruser@gmail.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
CID 1141012 (#1 of 1): Copy into fixed size buffer (STRING_OVERFLOW)
2. fixed_size_dest: You might overrun the 108 byte fixed-size string
"addr.sun_path" by copying "service_address" without checking the
length.
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
These functions are to be used to check criu, dump process and restore process.
Signed-off-by: Ruslan Kuprieiev <kupruser@gmail.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
We need ldflags-so to link libcriu with -lprotobuf-c
and rpc.pb-c.o to use RPC.
Signed-off-by: Ruslan Kuprieiev <kupruser@gmail.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Defining it as static char is a bad idea especially
if it get included and never used -- we will get
"unused" variable error.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Add target lib to Makefile for criu library.
Created directory lib and add there Makefile and criu.c - skelettons for criu library.
Signed-off-by: Ruslan Kupreev <kupruser@gmail.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
