1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
|
/*
* lxc: linux Container library
*
* (C) Copyright IBM Corp. 2007, 2009
*
* Authors:
* Daniel Lezcano <dlezcano at fr.ibm.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <unistd.h>
#include <alloca.h>
#include <errno.h>
#include <signal.h>
#include <syscall.h>
#include <sys/param.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "namespace.h"
#include "log.h"
#ifndef __NR_setns
# if __i386__
# define __NR_setns 338
# elif __x86_64__
# define __NR_setns 300
# elif __powerpc__
# define __NR_setns 323
# elif __s390__
# define __NR_setns 332
# else
# warning "architecture not supported for setns"
# endif
#endif
lxc_log_define(lxc_namespace, lxc);
struct clone_arg {
int (*fn)(void *);
void *arg;
};
int setns(int nstype, int fd)
{
#ifndef __NR_setns
errno = ENOSYS;
return -1;
#else
return syscall(__NR_setns, nstype, fd);
#endif
}
static int do_clone(void *arg)
{
struct clone_arg *clone_arg = arg;
return clone_arg->fn(clone_arg->arg);
}
pid_t lxc_clone(int (*fn)(void *), void *arg, int flags)
{
struct clone_arg clone_arg = {
.fn = fn,
.arg = arg,
};
long stack_size = sysconf(_SC_PAGESIZE);
void *stack = alloca(stack_size) + stack_size;
pid_t ret;
#ifdef __ia64__
ret = __clone2(do_clone, stack,
stack_size, flags | SIGCHLD, &clone_arg);
#else
ret = clone(do_clone, stack, flags | SIGCHLD, &clone_arg);
#endif
if (ret < 0)
ERROR("failed to clone(0x%x): %s", flags, strerror(errno));
return ret;
}
int lxc_attach(pid_t pid)
{
char path[MAXPATHLEN];
char *ns[] = { "pid", "mnt", "net", "ipc", "uts" };
const int size = sizeof(ns) / sizeof(char *);
int fd[size];
int i;
sprintf(path, "/proc/%d/ns", pid);
if (access(path, R_OK)) {
ERROR("Does this kernel version support 'attach' ?");
return -1;
}
for (i = 0; i < size; i++) {
sprintf(path, "/proc/%d/ns/%s", pid, ns[i]);
fd[i] = open(path, O_RDONLY);
if (fd[i] < 0) {
SYSERROR("failed to open '%s'", path);
return -1;
}
}
for (i = 0; i < size; i++) {
if (setns(0, fd[i])) {
SYSERROR("failed to set namespace '%s'", ns[i]);
return -1;
}
close(fd[i]);
}
return 0;
}
|
GitWeb