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/*
* Copyright RedHat Inc. 2008
*
* Authors: Vivek Goyal <vgoyal@redhat.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2.1 of the GNU Lesser General Public License
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
*/
#include <errno.h>
#include <grp.h>
#include <libcgroup.h>
#include <limits.h>
#include <pwd.h>
#include <search.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <getopt.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/types.h>
#include "tools-common.h"
static struct option longopts[] = {
{"sticky", no_argument, NULL, 's'},
{0, 0, 0, 0}
};
int main(int argc, char *argv[])
{
int ret = 0, i;
int cg_specified = 0;
int flag_child = 0;
uid_t uid;
gid_t gid;
pid_t pid;
char c;
struct cgroup_group_spec *cgroup_list[CG_HIER_MAX];
if (argc < 2) {
fprintf(stderr, "Usage is %s"
" [-g <list of controllers>:<relative path to cgroup>]"
" [--sticky] command [arguments] \n",
argv[0]);
exit(2);
}
memset(cgroup_list, 0, sizeof(cgroup_list));
while ((c = getopt_long(argc, argv, "+g:s", longopts, NULL)) > 0) {
switch (c) {
case 'g':
ret = parse_cgroup_spec(cgroup_list, optarg,
CG_HIER_MAX);
if (ret) {
fprintf(stderr, "cgroup controller and path"
"parsing failed\n");
return -1;
}
cg_specified = 1;
break;
case 's':
flag_child |= CGROUP_DAEMON_UNCHANGE_CHILDREN;
break;
default:
fprintf(stderr, "Invalid command line option\n");
exit(1);
break;
}
}
/* Executable name */
if (!argv[optind]) {
fprintf(stderr, "No command specified\n");
exit(1);
}
/* Initialize libcg */
ret = cgroup_init();
if (ret) {
fprintf(stderr, "libcgroup initialization failed: %s\n",
cgroup_strerror(ret));
return ret;
}
uid = getuid();
gid = getgid();
pid = getpid();
ret = cgroup_register_unchanged_process(pid, flag_child);
if (ret) {
fprintf(stderr, "registration of process failed\n");
return ret;
}
/*
* 'cgexec' command file needs the root privilege for executing
* a cgroup_register_unchanged_process() by using unix domain
* socket, and an euid should be changed to the executing user
* from a root user.
*/
if (seteuid(uid)) {
fprintf(stderr, "%s", strerror(errno));
return -1;
}
if (cg_specified) {
/*
* User has specified the list of control group and
* controllers
* */
for (i = 0; i < CG_HIER_MAX; i++) {
if (!cgroup_list[i])
break;
ret = cgroup_change_cgroup_path(cgroup_list[i]->path,
pid,
cgroup_list[i]->controllers);
if (ret) {
fprintf(stderr,
"cgroup change of group failed\n");
return ret;
}
}
} else {
/* Change the cgroup by determining the rules based on uid */
ret = cgroup_change_cgroup_flags(uid, gid,
argv[optind], pid, 0);
if (ret) {
fprintf(stderr, "cgroup change of group failed\n");
return ret;
}
}
/* Now exec the new process */
ret = execvp(argv[optind], &argv[optind]);
if (ret == -1) {
fprintf(stderr, "%s", strerror(errno));
return -1;
}
return 0;
}
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