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api: add set_cgroup_item and get_cgroup_item (to c api)
set_cgroup_item takes a pointer to a running container, a cgroup subsystem name, and a char *value and it mimicks 'lxc-cgroup -n containername subsys value' get_cgroup_item takes a pointer to a running container, a a cgroup subsystem name, a destination value * and the length of the value being sent in, and returns the length of what was read from the cgroup file. If a 0 len is passed in, then the length of the file is returned. So you can do len = c->get_cgroup_item(c, "devices.list", NULL, 0); v = malloc(len+1); ret = c->get_cgroup_item(c, "devices.list", v, len); to read the whole file. This patch also disables the lxc-init part of the startone test, which was failing because lxc-init has been moved due to multiarch issues. The test is salvagable, but saving it was beyond this effort. Signed-off-by: Serge Hallyn <email@example.com> Acked-by: Stéphane Graber <firstname.lastname@example.org>
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