blob: 8a82b4b8ea52cb3690e25bf039eaf32ff5c8c079 [file] [log] [blame]
* Copyright (C) 2004 IBM Corporation
* Author: Serge Hallyn <>
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation, version 2 of the
* License.
#include <linux/module.h>
#include <linux/uts.h>
#include <linux/utsname.h>
#include <linux/err.h>
#include <linux/slab.h>
static struct uts_namespace *create_uts_ns(void)
struct uts_namespace *uts_ns;
uts_ns = kmalloc(sizeof(struct uts_namespace), GFP_KERNEL);
if (uts_ns)
return uts_ns;
* Clone a new ns copying an original utsname, setting refcount to 1
* @old_ns: namespace to clone
* Return NULL on error (failure to kmalloc), new ns otherwise
static struct uts_namespace *clone_uts_ns(struct uts_namespace *old_ns)
struct uts_namespace *ns;
ns = create_uts_ns();
if (!ns)
return ERR_PTR(-ENOMEM);
memcpy(&ns->name, &old_ns->name, sizeof(ns->name));
return ns;
* Copy task tsk's utsname namespace, or clone it if flags
* specifies CLONE_NEWUTS. In latter case, changes to the
* utsname of this process won't be seen by parent, and vice
* versa.
struct uts_namespace *copy_utsname(unsigned long flags, struct uts_namespace *old_ns)
struct uts_namespace *new_ns;
if (!(flags & CLONE_NEWUTS))
return old_ns;
new_ns = clone_uts_ns(old_ns);
return new_ns;
void free_uts_ns(struct kref *kref)
struct uts_namespace *ns;
ns = container_of(kref, struct uts_namespace, kref);