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/*
* 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"
#include "setns.h"
lxc_log_define(lxc_namespace, lxc);
struct clone_arg {
int (*fn)(void *);
void *arg;
};
int setns(int fd, int nstype)
{
#ifndef __NR_setns
errno = ENOSYS;
return -1;
#else
return syscall(__NR_setns, fd, nstype);
#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);
pid_t ret;
#ifdef __ia64__
ret = __clone2(do_clone, stack,
stack_size, flags | SIGCHLD, &clone_arg);
#else
ret = clone(do_clone, stack + stack_size, 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, X_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(fd[i], 0)) {
SYSERROR("failed to set namespace '%s'", ns[i]);
return -1;
}
close(fd[i]);
}
return 0;
}
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