4 * Author: Eric Biederman <ebiederm@xmision.com>
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as
8 * published by the Free Software Foundation, version 2 of the
12 #include <linux/export.h>
13 #include <linux/uts.h>
14 #include <linux/utsname.h>
15 #include <linux/sysctl.h>
16 #include <linux/wait.h>
18 #ifdef CONFIG_PROC_SYSCTL
20 static void *get_uts(struct ctl_table *table, int write)
22 char *which = table->data;
23 struct uts_namespace *uts_ns;
25 uts_ns = current->nsproxy->uts_ns;
26 which = (which - (char *)&init_uts_ns) + (char *)uts_ns;
35 static void put_uts(struct ctl_table *table, int write, void *which)
44 * Special case of dostring for the UTS structure. This has locks
45 * to observe. Should this be in kernel/sys.c ????
47 static int proc_do_uts_string(struct ctl_table *table, int write,
48 void __user *buffer, size_t *lenp, loff_t *ppos)
50 struct ctl_table uts_table;
52 memcpy(&uts_table, table, sizeof(uts_table));
53 uts_table.data = get_uts(table, write);
54 r = proc_dostring(&uts_table, write, buffer, lenp, ppos);
55 put_uts(table, write, uts_table.data);
58 proc_sys_poll_notify(table->poll);
63 #define proc_do_uts_string NULL
66 static DEFINE_CTL_TABLE_POLL(hostname_poll);
67 static DEFINE_CTL_TABLE_POLL(domainname_poll);
69 static struct ctl_table uts_kern_table[] = {
72 .data = init_uts_ns.name.sysname,
73 .maxlen = sizeof(init_uts_ns.name.sysname),
75 .proc_handler = proc_do_uts_string,
78 .procname = "osrelease",
79 .data = init_uts_ns.name.release,
80 .maxlen = sizeof(init_uts_ns.name.release),
82 .proc_handler = proc_do_uts_string,
85 .procname = "version",
86 .data = init_uts_ns.name.version,
87 .maxlen = sizeof(init_uts_ns.name.version),
89 .proc_handler = proc_do_uts_string,
92 .procname = "hostname",
93 .data = init_uts_ns.name.nodename,
94 .maxlen = sizeof(init_uts_ns.name.nodename),
96 .proc_handler = proc_do_uts_string,
97 .poll = &hostname_poll,
100 .procname = "domainname",
101 .data = init_uts_ns.name.domainname,
102 .maxlen = sizeof(init_uts_ns.name.domainname),
104 .proc_handler = proc_do_uts_string,
105 .poll = &domainname_poll,
110 static struct ctl_table uts_root_table[] = {
112 .procname = "kernel",
114 .child = uts_kern_table,
119 #ifdef CONFIG_PROC_SYSCTL
121 * Notify userspace about a change in a certain entry of uts_kern_table,
122 * identified by the parameter proc.
124 void uts_proc_notify(enum uts_proc proc)
126 struct ctl_table *table = &uts_kern_table[proc];
128 proc_sys_poll_notify(table->poll);
132 static int __init utsname_sysctl_init(void)
134 register_sysctl_table(uts_root_table);
138 device_initcall(utsname_sysctl_init);