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 <strings.h>
34#include <errno.h>
35#include "test.h"
36#include "lapi/namespaces_constants.h"
37#include "ns_common.h"
38
39char *TCID = "ns_create";
40
41
42void print_help(void)
43{
44	int i;
45
46	printf("usage: ns_create <%s", params[0].name);
47
48	for (i = 1; params[i].name; i++)
49		printf("|,%s", params[i].name);
50	printf(">\nThe only argument is a comma separated list "
51	       "of namespaces to create.\nExample: ns_create net,ipc\n");
52}
53
54static int child_fn(void *arg LTP_ATTRIBUTE_UNUSED)
55{
56	int i;
57
58	if (setsid() == -1) {
59		tst_resm(TINFO | TERRNO, "setsid");
60		exit(1);
61	}
62
63	if (chdir("/") == -1) {
64		tst_resm(TINFO | TERRNO, "chdir");
65		exit(1);
66	}
67
68	/* close all inherrited file descriptors */
69	for (i = 0; i < sysconf(_SC_OPEN_MAX); i++)
70		close(i);
71
72	pause();
73	return 0;
74}
75
76/*
77 * ./ns_create <ipc,mnt,net,pid,user,uts>
78 */
79int main(int argc, char *argv[])
80{
81	int pid, flags;
82	char *token;
83
84	if (argc < 2) {
85		print_help();
86		return 1;
87	}
88
89	flags = 0;
90	while ((token = strsep(&argv[1], ","))) {
91		struct param *p = get_param(token);
92
93		if (!p) {
94			tst_resm(TINFO, "Unknown namespace: %s", token);
95			print_help();
96			return 1;
97		}
98
99		flags |= p->flag;
100	}
101
102	pid = ltp_clone_quick(flags | SIGCHLD, child_fn, NULL);
103	if (pid == -1) {
104		tst_resm(TINFO | TERRNO, "ltp_clone_quick");
105		return 1;
106	}
107
108	printf("%d", pid);
109	return 0;
110}
111