ARM: OMAP: Improve 34xx detection
[linux-ginger.git] / kernel / utsname_sysctl.c
blob4ab9659d269e23bc315729f840b8742b5876e1ff
1 /*
2 * Copyright (C) 2007
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
9 * License.
12 #include <linux/module.h>
13 #include <linux/uts.h>
14 #include <linux/utsname.h>
15 #include <linux/sysctl.h>
17 static void *get_uts(ctl_table *table, int write)
19 char *which = table->data;
20 struct uts_namespace *uts_ns;
22 uts_ns = current->nsproxy->uts_ns;
23 which = (which - (char *)&init_uts_ns) + (char *)uts_ns;
25 if (!write)
26 down_read(&uts_sem);
27 else
28 down_write(&uts_sem);
29 return which;
32 static void put_uts(ctl_table *table, int write, void *which)
34 if (!write)
35 up_read(&uts_sem);
36 else
37 up_write(&uts_sem);
40 #ifdef CONFIG_PROC_FS
42 * Special case of dostring for the UTS structure. This has locks
43 * to observe. Should this be in kernel/sys.c ????
45 static int proc_do_uts_string(ctl_table *table, int write, struct file *filp,
46 void __user *buffer, size_t *lenp, loff_t *ppos)
48 struct ctl_table uts_table;
49 int r;
50 memcpy(&uts_table, table, sizeof(uts_table));
51 uts_table.data = get_uts(table, write);
52 r = proc_dostring(&uts_table,write,filp,buffer,lenp, ppos);
53 put_uts(table, write, uts_table.data);
54 return r;
56 #else
57 #define proc_do_uts_string NULL
58 #endif
61 #ifdef CONFIG_SYSCTL_SYSCALL
62 /* The generic string strategy routine: */
63 static int sysctl_uts_string(ctl_table *table, int __user *name, int nlen,
64 void __user *oldval, size_t __user *oldlenp,
65 void __user *newval, size_t newlen)
67 struct ctl_table uts_table;
68 int r, write;
69 write = newval && newlen;
70 memcpy(&uts_table, table, sizeof(uts_table));
71 uts_table.data = get_uts(table, write);
72 r = sysctl_string(&uts_table, name, nlen,
73 oldval, oldlenp, newval, newlen);
74 put_uts(table, write, uts_table.data);
75 return r;
77 #else
78 #define sysctl_uts_string NULL
79 #endif
81 static struct ctl_table uts_kern_table[] = {
83 .ctl_name = KERN_OSTYPE,
84 .procname = "ostype",
85 .data = init_uts_ns.name.sysname,
86 .maxlen = sizeof(init_uts_ns.name.sysname),
87 .mode = 0444,
88 .proc_handler = proc_do_uts_string,
89 .strategy = sysctl_uts_string,
92 .ctl_name = KERN_OSRELEASE,
93 .procname = "osrelease",
94 .data = init_uts_ns.name.release,
95 .maxlen = sizeof(init_uts_ns.name.release),
96 .mode = 0444,
97 .proc_handler = proc_do_uts_string,
98 .strategy = sysctl_uts_string,
101 .ctl_name = KERN_VERSION,
102 .procname = "version",
103 .data = init_uts_ns.name.version,
104 .maxlen = sizeof(init_uts_ns.name.version),
105 .mode = 0444,
106 .proc_handler = proc_do_uts_string,
107 .strategy = sysctl_uts_string,
110 .ctl_name = KERN_NODENAME,
111 .procname = "hostname",
112 .data = init_uts_ns.name.nodename,
113 .maxlen = sizeof(init_uts_ns.name.nodename),
114 .mode = 0644,
115 .proc_handler = proc_do_uts_string,
116 .strategy = sysctl_uts_string,
119 .ctl_name = KERN_DOMAINNAME,
120 .procname = "domainname",
121 .data = init_uts_ns.name.domainname,
122 .maxlen = sizeof(init_uts_ns.name.domainname),
123 .mode = 0644,
124 .proc_handler = proc_do_uts_string,
125 .strategy = sysctl_uts_string,
130 static struct ctl_table uts_root_table[] = {
132 .ctl_name = CTL_KERN,
133 .procname = "kernel",
134 .mode = 0555,
135 .child = uts_kern_table,
140 static int __init utsname_sysctl_init(void)
142 register_sysctl_table(uts_root_table);
143 return 0;
146 __initcall(utsname_sysctl_init);