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crtools: write a pid of a root task in a specified file

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When we restore a pid namespace the root task will get some unknown pid
in the original (i.e. -- the ns crtools a launched from) one. To find
this pid out one can use this option -- it will make the pid obtained by
the new init to be written into a pid file.

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
This commit is contained in:
Andrey Vagin
2012-08-14 12:54:00 +04:00
committed by Pavel Emelyanov
parent a5ac06f503
commit aabb56bd66
3 changed files with 20 additions and 0 deletions
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14
cr-restore.c
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@@ -547,6 +547,20 @@ static inline int fork_with_pid(struct pstree_item *item, unsigned long ns_clone
if (ca.clone_flags & CLONE_NEWPID)
item->pid.real = ret;
if (opts.pidfile && root_item == item) {
int fd;
fd = open(opts.pidfile, O_WRONLY | O_TRUNC | O_CREAT, 0600);
if (fd == -1) {
pr_perror("Can't open %s", opts.pidfile);
kill(ret, SIGKILL);
} else {
dprintf(fd, "%d", ret);
close(fd);
}
}
err_unlock:
if (flock(ca.fd, LOCK_UN))
pr_perror("%d: Can't unlock %s", pid, LAST_PID_PATH);