1/* Copyright (c) 2015 Red Hat, Inc.
2 *
3 * This program is free software: you can redistribute it and/or modify
4 * it under the terms of version 2 the GNU General Public License as
5 * published by the Free Software Foundation.
6 *
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
10 * GNU General Public License for more details.
11 *
12 * You should have received a copy of the GNU General Public License
13 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
14 *
15 * Written by Matus Marhefka <mmarhefk@redhat.com>
16 *
17 ***********************************************************************
18 * Creates a child process in the new specified namespace(s), child is then
19 * daemonized and is running in the background. PID of the daemonized child
20 * process is printed on the stdout. As the new namespace(s) is(are) maintained
21 * by the daemonized child process it(they) can be removed by killing this
22 * process.
23 *
24 */
25
26#define _GNU_SOURCE
27#include <sched.h>
28#include <sys/syscall.h>
29#include <sys/types.h>
30#include <sys/stat.h>
31#include <unistd.h>
32#include <string.h>
33#include <errno.h>
34#include "test.h"
35#include "lapi/namespaces_constants.h"
36#include "ns_common.h"
37
38char *TCID = "ns_create";
39
40
41void print_help(void)
42{
43	int i;
44
45	printf("usage: ns_create <%s", params[0].name);
46
47	for (i = 1; params[i].name; i++)
48		printf("|,%s", params[i].name);
49	printf(">\nThe only argument is a comma separated list "
50	       "of namespaces to create.\nExample: ns_create net,ipc\n");
51}
52
53static int child_fn(void *arg LTP_ATTRIBUTE_UNUSED)
54{
55	int i;
56
57	if (setsid() == -1) {
58		tst_resm(TINFO | TERRNO, "setsid");
59		exit(1);
60	}
61
62	if (chdir("/") == -1) {
63		tst_resm(TINFO | TERRNO, "chdir");
64		exit(1);
65	}
66
67	/* close all inherrited file descriptors */
68	for (i = 0; i < sysconf(_SC_OPEN_MAX); i++)
69		close(i);
70
71	pause();
72	return 0;
73}
74
75/*
76 * ./ns_create <ipc,mnt,net,pid,user,uts>
77 */
78int main(int argc, char *argv[])
79{
80	int pid, flags;
81	char *token;
82
83	if (argc < 2) {
84		print_help();
85		return 1;
86	}
87
88	flags = 0;
89	while ((token = strsep(&argv[1], ","))) {
90		struct param *p = get_param(token);
91
92		if (!p) {
93			tst_resm(TINFO, "Unknown namespace: %s", token);
94			print_help();
95			return 1;
96		}
97
98		flags |= p->flag;
99	}
100
101	pid = ltp_clone_quick(flags | SIGCHLD, child_fn, NULL);
102	if (pid == -1) {
103		tst_resm(TINFO | TERRNO, "ltp_clone_quick");
104		return 1;
105	}
106
107	printf("%d", pid);
108	return 0;
109}
110