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>
17 #include <linux/rwsem.h>
19 #ifdef CONFIG_PROC_SYSCTL
21 static void *get_uts(struct ctl_table *table, int write)
23 char *which = table->data;
24 struct uts_namespace *uts_ns;
26 uts_ns = current->nsproxy->uts_ns;
27 which = (which - (char *)&init_uts_ns) + (char *)uts_ns;
36 static void put_uts(struct ctl_table *table, int write, void *which)
45 * Special case of dostring for the UTS structure. This has locks
46 * to observe. Should this be in kernel/sys.c ????
48 static int proc_do_uts_string(struct ctl_table *table, int write,
49 void __user *buffer, size_t *lenp, loff_t *ppos)
51 struct ctl_table uts_table;
53 memcpy(&uts_table, table, sizeof(uts_table));
54 uts_table.data = get_uts(table, write);
55 r = proc_dostring(&uts_table, write, buffer, lenp, ppos);
56 put_uts(table, write, uts_table.data);
59 proc_sys_poll_notify(table->poll);
64 #define proc_do_uts_string NULL
67 static DEFINE_CTL_TABLE_POLL(hostname_poll);
68 static DEFINE_CTL_TABLE_POLL(domainname_poll);
70 static struct ctl_table uts_kern_table[] = {
73 .data = init_uts_ns.name.sysname,
74 .maxlen = sizeof(init_uts_ns.name.sysname),
76 .proc_handler = proc_do_uts_string,
79 .procname = "osrelease",
80 .data = init_uts_ns.name.release,
81 .maxlen = sizeof(init_uts_ns.name.release),
83 .proc_handler = proc_do_uts_string,
86 .procname = "version",
87 .data = init_uts_ns.name.version,
88 .maxlen = sizeof(init_uts_ns.name.version),
90 .proc_handler = proc_do_uts_string,
93 .procname = "hostname",
94 .data = init_uts_ns.name.nodename,
95 .maxlen = sizeof(init_uts_ns.name.nodename),
97 .proc_handler = proc_do_uts_string,
98 .poll = &hostname_poll,
101 .procname = "domainname",
102 .data = init_uts_ns.name.domainname,
103 .maxlen = sizeof(init_uts_ns.name.domainname),
105 .proc_handler = proc_do_uts_string,
106 .poll = &domainname_poll,
111 static struct ctl_table uts_root_table[] = {
113 .procname = "kernel",
115 .child = uts_kern_table,
120 #ifdef CONFIG_PROC_SYSCTL
122 * Notify userspace about a change in a certain entry of uts_kern_table,
123 * identified by the parameter proc.
125 void uts_proc_notify(enum uts_proc proc)
127 struct ctl_table *table = &uts_kern_table[proc];
129 proc_sys_poll_notify(table->poll);
133 static int __init utsname_sysctl_init(void)
135 register_sysctl_table(uts_root_table);
139 device_initcall(utsname_sysctl_init);