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Line 68: − + + − If no pid is set and type is DUMP, CRIU will dump client process by default.+ − Note: Whole tree <pid> must have the same uid, as a client, or client's uid must be == 0, otherwise CRIU won't dump nothing at all. − + − + − +
→Protobuf messages
=== Request ===
=== Request ===
==== criu_req ====
==== criu_req ====
This is the header of the request. It defines the operation requested and options.
<pre>
<pre>
message criu_req {
message criu_req {
required criu_req_type type = 1;
required criu_req_type type = 1;
optional criu_opts opts = 2;
optional criu_opts opts = 2;
}
}
==== criu_req_type ====
==== criu_req_type ====
There are 8 request/response types for now. Comments show cmdline analogs.
There are 8 request/response types for now. Comments show cmdline analogs.
<pre>enum criu_req_type {
<pre>enum criu_req_type {
EMPTY = 0;
EMPTY = 0;
PRE_DUMP = 4; /* criu pre-dump */
PRE_DUMP = 4; /* criu pre-dump */
PAGE_SERVER = 5; /* criu page-server */
PAGE_SERVER = 5; /* criu page-server */
CPUINFO_DUMP = 7; /* criu cpuinfo dump */
CPUINFO_DUMP = 7; /* criu cpuinfo dump */
CPUINFO_CHECK = 8; /* criu cpuinfo check */
CPUINFO_CHECK = 8; /* criu cpuinfo check */
==== criu_opts ====
==== criu_opts ====
It is used to store options.
It is used to store options.
<pre>message criu_opts {
<pre>message criu_opts {
required int32 images_dir_fd = 1;
required int32 images_dir_fd = 1;
optional bool rst_sibling = 26; /* swrk only */
optional bool rst_sibling = 26; /* swrk only */
}</pre>
}
</pre>
Comments to options.
Only images_dir_fd is required, all other fields may not be set.
* If no pid is set and type is DUMP, CRIU will dump client process by default.
Client must open directory for/with images by himself and set images_dir_fd to it's fd.
* All processes in the subtree starting with <pid> must have the same uid, as a client, or client's uid must be root (uid == 0), otherwise CRIU will return error.
CRIU will open /proc/<client's_pid>/fd/<images_dir_fd>, so it will work, if client is in another namespace.
* Only the images_dir_fd is required, all other fields are optional. Client must open directory for/with images by himself and set images_dir_fd to it's fd. CRIU will open /proc/<client's_pid>/fd/<images_dir_fd>.
The logic of setting request is the same as when setting options in console. Here is an example:
The logic of setting request is the same as when setting options in console. Here is an example: