mirror of
https://github.com/troglobit/finit.git
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141 lines
3.6 KiB
C
141 lines
3.6 KiB
C
/* Finit control group support functions
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*
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* Copyright (c) 2019-2021 Joachim Wiberg <troglobit@gmail.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <errno.h>
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#include <stdio.h>
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#include <string.h>
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#include <lite/lite.h>
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#include <sys/mount.h>
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#include "log.h"
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#include "util.h"
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static int cg_init = 0;
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/*
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* Called by Finit at early boot to mount initial cgroups
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*/
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void cgroup_init(void)
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{
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FILE *fp;
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char buf[80];
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int opts = MS_NODEV | MS_NOEXEC | MS_NOSUID;
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fp = fopen("/proc/cgroups", "r");
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if (!fp) {
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_d("No cgroup support");
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return;
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}
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if (mount("none", "/sys/fs/cgroup", "tmpfs", opts, NULL)) {
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_d("Failed mounting cgroups");
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goto fail;
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}
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/* Skip first line, header */
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fgets(buf, sizeof(buf), fp);
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while (fgets(buf, sizeof(buf), fp)) {
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char *cgroup;
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char rc[80];
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cgroup = strtok(buf, "\t ");
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if (!cgroup)
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continue;
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snprintf(rc, sizeof(rc), "/sys/fs/cgroup/%s", cgroup);
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if (mkdir(rc, 0755) && EEXIST != errno)
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continue;
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if (mount("cgroup", rc, "cgroup", opts, cgroup))
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_d("Failed mounting %s cgroup on %s", cgroup, rc);
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}
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/* Default cgroups for process monitoring */
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if (mkdir("/sys/fs/cgroup/finit", 0755) && EEXIST != errno)
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goto fail;
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if (mount("none", "/sys/fs/cgroup/finit", "cgroup", opts, "none,name=finit")) {
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_pe("Failed mounting Finit cgroup hierarchy");
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goto fail;
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}
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/* Set up reaper and enable callbacks */
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echo("/sys/fs/cgroup/finit/release_agent", 0, FINIT_LIBPATH_ "/cgreaper.sh");
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echo("/sys/fs/cgroup/finit/notify_on_release", 0, "1");
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/* Default groups, PID 1, services, and user/login processes */
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if (mkdir("/sys/fs/cgroup/finit/init", 0755) && EEXIST != errno)
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goto fail;
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if (mkdir("/sys/fs/cgroup/finit/system", 0755) && EEXIST != errno)
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goto fail;
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if (mkdir("/sys/fs/cgroup/finit/user", 0755) && EEXIST != errno)
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goto fail;
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/* Move ourselves to init */
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echo("/sys/fs/cgroup/finit/init/cgroup.procs", 0, "1");
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/* We have signal, main screen turn on! */
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cg_init = 1;
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fail:
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fclose(fp);
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}
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static int move_pid(char *group, char *name, char *id, int pid)
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{
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char path[256];
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snprintf(path, sizeof(path), "/sys/fs/cgroup/%s/%s:%s", group, name, id);
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if (mkdir(path, 0755) && errno != EEXIST)
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return 1;
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strlcat(path, "/cgroup.procs", sizeof(path));
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return echo(path, 0, "%d", pid);
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}
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int cgroup_user(char *name)
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{
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if (!cg_init)
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return 0;
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return move_pid("finit/user", name, "0", getpid());
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}
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int cgroup_service(char *nm, char *id, int pid)
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{
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if (!cg_init)
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return 0;
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if (pid <= 0) {
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errno = EINVAL;
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return 1;
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}
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return move_pid("finit/system", nm, id, pid);
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}
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/**
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* Local Variables:
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* indent-tabs-mode: t
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* c-file-style: "linux"
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* End:
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*/
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