4ad490007b
Replace the very generic cgroup hookup with a much simpler one. With this change only the high-level cgroup settings remain, the ability to set arbitrary cgroup attributes is removed, so is support for adding units to arbitrary cgroup controllers or setting arbitrary paths for them (especially paths that are different for the various controllers). This also introduces a new -.slice root slice, that is the parent of system.slice and friends. This enables easy admin configuration of root-level cgrouo properties. This replaces DeviceDeny= by DevicePolicy=, and implicitly adds in /dev/null, /dev/zero and friends if DeviceAllow= is used (unless this is turned off by DevicePolicy=).
81 lines
2 KiB
C
81 lines
2 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <errno.h>
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#include <unistd.h>
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#include <signal.h>
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#include <string.h>
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#include <stdlib.h>
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#include <dirent.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <ftw.h>
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#include "cgroup-util.h"
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#include "log.h"
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#include "set.h"
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#include "macro.h"
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#include "util.h"
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#include "mkdir.h"
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/* This is split out since it needs label calls, either directly or
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* indirectly. */
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int cg_create(const char *controller, const char *path) {
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_cleanup_free_ char *fs = NULL;
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int r;
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r = cg_get_path_and_check(controller, path, NULL, &fs);
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if (r < 0)
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return r;
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r = mkdir_parents_prefix("/sys/fs/cgroup", fs, 0755);
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if (r < 0)
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return r;
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if (mkdir(fs, 0755) < 0) {
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if (errno == EEXIST)
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return 0;
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return -errno;
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}
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return 1;
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}
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int cg_create_and_attach(const char *controller, const char *path, pid_t pid) {
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int r, q;
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assert(pid >= 0);
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r = cg_create(controller, path);
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if (r < 0)
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return r;
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q = cg_attach(controller, path, pid);
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if (q < 0)
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return q;
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/* This does not remove the cgroup on failure */
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return r;
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}
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