~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/include/linux/sysctl.h

Version: ~ [ linux-5.13-rc1 ] ~ [ linux-5.12.2 ] ~ [ linux-5.11.19 ] ~ [ linux-5.10.35 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.117 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.190 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.232 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.268 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.268 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  * sysctl.h: General linux system control interface
  3  *
  4  * Begun 24 March 1995, Stephen Tweedie
  5  *
  6  ****************************************************************
  7  ****************************************************************
  8  **
  9  **  WARNING:
 10  **  The values in this file are exported to user space via 
 11  **  the sysctl() binary interface.  Do *NOT* change the
 12  **  numbering of any existing values here, and do not change
 13  **  any numbers within any one set of values.  If you have to
 14  **  redefine an existing interface, use a new number for it.
 15  **  The kernel will then return -ENOTDIR to any application using
 16  **  the old binary interface.
 17  **
 18  ****************************************************************
 19  ****************************************************************
 20  */
 21 #ifndef _LINUX_SYSCTL_H
 22 #define _LINUX_SYSCTL_H
 23 
 24 #include <linux/list.h>
 25 #include <linux/rcupdate.h>
 26 #include <linux/wait.h>
 27 #include <linux/rbtree.h>
 28 #include <linux/uidgid.h>
 29 #include <uapi/linux/sysctl.h>
 30 
 31 /* For the /proc/sys support */
 32 struct completion;
 33 struct ctl_table;
 34 struct nsproxy;
 35 struct ctl_table_root;
 36 struct ctl_table_header;
 37 struct ctl_dir;
 38 
 39 typedef int proc_handler (struct ctl_table *ctl, int write,
 40                           void __user *buffer, size_t *lenp, loff_t *ppos);
 41 
 42 extern int proc_dostring(struct ctl_table *, int,
 43                          void __user *, size_t *, loff_t *);
 44 extern int proc_dointvec(struct ctl_table *, int,
 45                          void __user *, size_t *, loff_t *);
 46 extern int proc_douintvec(struct ctl_table *, int,
 47                          void __user *, size_t *, loff_t *);
 48 extern int proc_dointvec_minmax(struct ctl_table *, int,
 49                                 void __user *, size_t *, loff_t *);
 50 extern int proc_dointvec_jiffies(struct ctl_table *, int,
 51                                  void __user *, size_t *, loff_t *);
 52 extern int proc_dointvec_userhz_jiffies(struct ctl_table *, int,
 53                                         void __user *, size_t *, loff_t *);
 54 extern int proc_dointvec_ms_jiffies(struct ctl_table *, int,
 55                                     void __user *, size_t *, loff_t *);
 56 extern int proc_doulongvec_minmax(struct ctl_table *, int,
 57                                   void __user *, size_t *, loff_t *);
 58 extern int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int,
 59                                       void __user *, size_t *, loff_t *);
 60 extern int proc_do_large_bitmap(struct ctl_table *, int,
 61                                 void __user *, size_t *, loff_t *);
 62 
 63 /*
 64  * Register a set of sysctl names by calling register_sysctl_table
 65  * with an initialised array of struct ctl_table's.  An entry with 
 66  * NULL procname terminates the table.  table->de will be
 67  * set up by the registration and need not be initialised in advance.
 68  *
 69  * sysctl names can be mirrored automatically under /proc/sys.  The
 70  * procname supplied controls /proc naming.
 71  *
 72  * The table's mode will be honoured both for sys_sysctl(2) and
 73  * proc-fs access.
 74  *
 75  * Leaf nodes in the sysctl tree will be represented by a single file
 76  * under /proc; non-leaf nodes will be represented by directories.  A
 77  * null procname disables /proc mirroring at this node.
 78  *
 79  * sysctl(2) can automatically manage read and write requests through
 80  * the sysctl table.  The data and maxlen fields of the ctl_table
 81  * struct enable minimal validation of the values being written to be
 82  * performed, and the mode field allows minimal authentication.
 83  * 
 84  * There must be a proc_handler routine for any terminal nodes
 85  * mirrored under /proc/sys (non-terminals are handled by a built-in
 86  * directory handler).  Several default handlers are available to
 87  * cover common cases.
 88  */
 89 
 90 /* Support for userspace poll() to watch for changes */
 91 struct ctl_table_poll {
 92         atomic_t event;
 93         wait_queue_head_t wait;
 94 };
 95 
 96 static inline void *proc_sys_poll_event(struct ctl_table_poll *poll)
 97 {
 98         return (void *)(unsigned long)atomic_read(&poll->event);
 99 }
100 
101 #define __CTL_TABLE_POLL_INITIALIZER(name) {                            \
102         .event = ATOMIC_INIT(0),                                        \
103         .wait = __WAIT_QUEUE_HEAD_INITIALIZER(name.wait) }
104 
105 #define DEFINE_CTL_TABLE_POLL(name)                                     \
106         struct ctl_table_poll name = __CTL_TABLE_POLL_INITIALIZER(name)
107 
108 /* A sysctl table is an array of struct ctl_table: */
109 struct ctl_table 
110 {
111         const char *procname;           /* Text ID for /proc/sys, or zero */
112         void *data;
113         int maxlen;
114         umode_t mode;
115         struct ctl_table *child;        /* Deprecated */
116         proc_handler *proc_handler;     /* Callback for text formatting */
117         struct ctl_table_poll *poll;
118         void *extra1;
119         void *extra2;
120 };
121 
122 struct ctl_node {
123         struct rb_node node;
124         struct ctl_table_header *header;
125 };
126 
127 /* struct ctl_table_header is used to maintain dynamic lists of
128    struct ctl_table trees. */
129 struct ctl_table_header
130 {
131         union {
132                 struct {
133                         struct ctl_table *ctl_table;
134                         int used;
135                         int count;
136                         int nreg;
137                 };
138                 struct rcu_head rcu;
139         };
140         struct completion *unregistering;
141         struct ctl_table *ctl_table_arg;
142         struct ctl_table_root *root;
143         struct ctl_table_set *set;
144         struct ctl_dir *parent;
145         struct ctl_node *node;
146         struct hlist_head inodes; /* head for proc_inode->sysctl_inodes */
147 };
148 
149 struct ctl_dir {
150         /* Header must be at the start of ctl_dir */
151         struct ctl_table_header header;
152         struct rb_root root;
153 };
154 
155 struct ctl_table_set {
156         int (*is_seen)(struct ctl_table_set *);
157         struct ctl_dir dir;
158 };
159 
160 struct ctl_table_root {
161         struct ctl_table_set default_set;
162         struct ctl_table_set *(*lookup)(struct ctl_table_root *root);
163         void (*set_ownership)(struct ctl_table_header *head,
164                               struct ctl_table *table,
165                               kuid_t *uid, kgid_t *gid);
166         int (*permissions)(struct ctl_table_header *head, struct ctl_table *table);
167 };
168 
169 /* struct ctl_path describes where in the hierarchy a table is added */
170 struct ctl_path {
171         const char *procname;
172 };
173 
174 #ifdef CONFIG_SYSCTL
175 
176 void proc_sys_poll_notify(struct ctl_table_poll *poll);
177 
178 extern void setup_sysctl_set(struct ctl_table_set *p,
179         struct ctl_table_root *root,
180         int (*is_seen)(struct ctl_table_set *));
181 extern void retire_sysctl_set(struct ctl_table_set *set);
182 
183 void register_sysctl_root(struct ctl_table_root *root);
184 struct ctl_table_header *__register_sysctl_table(
185         struct ctl_table_set *set,
186         const char *path, struct ctl_table *table);
187 struct ctl_table_header *__register_sysctl_paths(
188         struct ctl_table_set *set,
189         const struct ctl_path *path, struct ctl_table *table);
190 struct ctl_table_header *register_sysctl(const char *path, struct ctl_table *table);
191 struct ctl_table_header *register_sysctl_table(struct ctl_table * table);
192 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
193                                                 struct ctl_table *table);
194 
195 void unregister_sysctl_table(struct ctl_table_header * table);
196 
197 extern int sysctl_init(void);
198 
199 extern struct ctl_table sysctl_mount_point[];
200 
201 #else /* CONFIG_SYSCTL */
202 static inline struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
203 {
204         return NULL;
205 }
206 
207 static inline struct ctl_table_header *register_sysctl_paths(
208                         const struct ctl_path *path, struct ctl_table *table)
209 {
210         return NULL;
211 }
212 
213 static inline void unregister_sysctl_table(struct ctl_table_header * table)
214 {
215 }
216 
217 static inline void setup_sysctl_set(struct ctl_table_set *p,
218         struct ctl_table_root *root,
219         int (*is_seen)(struct ctl_table_set *))
220 {
221 }
222 
223 #endif /* CONFIG_SYSCTL */
224 
225 int sysctl_max_threads(struct ctl_table *table, int write,
226                        void __user *buffer, size_t *lenp, loff_t *ppos);
227 
228 #endif /* _LINUX_SYSCTL_H */
229 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp