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
39 char *TCID = "ns_create";
40
41
print_help(void)42 void 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
child_fn(void * arg LTP_ATTRIBUTE_UNUSED)54 static 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 */
main(int argc,char * argv[])79 int 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