CRIU introduces several images to keep info about what files are opened by task, but what options should I use to get images such as reg-files.img?
What I have done is as follows：
execl(criu, criu,
"dump",
"--images-dir", dump_dir,
"-d",
"-vvvv",
"-o", dump_log,
"-t", pid,
"--prev-images-dir", prev_dump_dir,
"--track-mem",
"--leave-running",
"--shell-job",
"--file-locks",
"--reg-files"
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