include/linux/sysctl.h

   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
  14  **  to 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  **  --sct
  19  **
  20  ****************************************************************
  21  ****************************************************************
  22  */
  23
  24 #ifndef _LINUX_SYSCTL_H
  25 #define _LINUX_SYSCTL_H
  26
  27 #include <linux/kernel.h>
  28 #include <linux/types.h>
  29 #include <linux/list.h>
  30
  31 struct file;
  32
  33 #define CTL_MAXNAME 10
  34
  35 struct __sysctl_args {
  36         int *name;
  37         int nlen;
  38         void *oldval;
  39         size_t *oldlenp;
  40         void *newval;
  41         size_t newlen;
  42         unsigned long __unused[4];
  43 };
  44
  45 /* Define sysctl names first */
  46
  47 /* Top-level names: */
  48
  49 /* For internal pattern-matching use only: */
  50 #ifdef __KERNEL__
  51 #define CTL_ANY         -1      /* Matches any name */
  52 #define CTL_NONE        0
  53 #endif
  54
  55 enum
  56 {
  57         CTL_KERN=1,             /* General kernel info and control */
  58         CTL_VM=2,               /* VM management */
  59         CTL_NET=3,              /* Networking */
  60         CTL_PROC=4,             /* Process info */
  61         CTL_FS=5,               /* Filesystems */
  62         CTL_DEBUG=6,            /* Debugging */
  63         CTL_DEV=7,              /* Devices */
  64         CTL_BUS=8               /* Buses */
  65 };
  66
  67 /* CTL_BUS names: */
  68 enum
  69 {
  70         BUS_ISA=1               /* ISA */
  71 };
  72
  73 /* CTL_KERN names: */
  74 enum
  75 {
  76         KERN_OSTYPE=1,          /* string: system version */
  77         KERN_OSRELEASE=2,       /* string: system release */
  78         KERN_OSREV=3,           /* int: system revision */
  79         KERN_VERSION=4,         /* string: compile time info */
  80         KERN_SECUREMASK=5,      /* struct: maximum rights mask */
  81         KERN_PROF=6,            /* table: profiling information */
  82         KERN_NODENAME=7,
  83         KERN_DOMAINNAME=8,
  84
  85         KERN_CAP_BSET=14,       /* int: capability bounding set */
  86         KERN_PANIC=15,          /* int: panic timeout */
  87         KERN_REALROOTDEV=16,    /* real root device to mount after initrd */
  88
  89         KERN_SPARC_REBOOT=21,   /* reboot command on Sparc */
  90         KERN_CTLALTDEL=22,      /* int: allow ctl-alt-del to reboot */
  91         KERN_PRINTK=23,         /* struct: control printk logging parameters */
  92         KERN_NAMETRANS=24,      /* Name translation */
  93         KERN_PPC_HTABRECLAIM=25, /* turn htab reclaimation on/off on PPC */
  94         KERN_PPC_ZEROPAGED=26,  /* turn idle page zeroing on/off on PPC */
  95         KERN_PPC_POWERSAVE_NAP=27, /* use nap mode for power saving */
  96         KERN_MODPROBE=28,
  97         KERN_SG_BIG_BUFF=29,
  98         KERN_ACCT=30,           /* BSD process accounting parameters */
  99         KERN_PPC_L2CR=31,       /* l2cr register on PPC */
 100
 101         KERN_RTSIGNR=32,        /* Number of rt sigs queued */
 102         KERN_RTSIGMAX=33,       /* Max queuable */
 103
 104         KERN_SHMMAX=34,         /* long: Maximum shared memory segment */
 105         KERN_MSGMAX=35,         /* int: Maximum size of a messege */
 106         KERN_MSGMNB=36,         /* int: Maximum message queue size */
 107         KERN_MSGPOOL=37,        /* int: Maximum system message pool size */
 108         KERN_SYSRQ=38,          /* int: Sysreq enable */
 109         KERN_MAX_THREADS=39,    /* int: Maximum nr of threads in the system */
 110         KERN_RANDOM=40,         /* Random driver */
 111         KERN_SHMALL=41,         /* int: Maximum size of shared memory */
 112         KERN_MSGMNI=42,         /* int: msg queue identifiers */
 113         KERN_SEM=43,            /* struct: sysv semaphore limits */
 114         KERN_SPARC_STOP_A=44,   /* int: Sparc Stop-A enable */
 115         KERN_SHMMNI=45,         /* int: shm array identifiers */
 116         KERN_OVERFLOWUID=46,    /* int: overflow UID */
 117         KERN_OVERFLOWGID=47,    /* int: overflow GID */
 118         KERN_SHMPATH=48,        /* string: path to shm fs */
 119         KERN_HOTPLUG=49,        /* string: path to hotplug policy agent */
 120 };
 121
 122
 123 /* CTL_VM names: */
 124 enum
 125 {
 126         VM_SWAPCTL=1,           /* struct: Set vm swapping control */
 127         VM_SWAPOUT=2,           /* int: Linear or sqrt() swapout for hogs */
 128         VM_FREEPG=3,            /* struct: Set free page thresholds */
 129         VM_BDFLUSH=4,           /* struct: Control buffer cache flushing */
 130         VM_OVERCOMMIT_MEMORY=5, /* Turn off the virtual memory safety limit */
 131         VM_BUFFERMEM=6,         /* struct: Set buffer memory thresholds */
 132         VM_PAGECACHE=7,         /* struct: Set cache memory thresholds */
 133         VM_PAGERDAEMON=8,       /* struct: Control kswapd behaviour */
 134         VM_PGT_CACHE=9,         /* struct: Set page table cache parameters */
 135         VM_PAGE_CLUSTER=10      /* int: set number of pages to swap together */
 136 };
 137
 138
 139 /* CTL_NET names: */
 140 enum
 141 {
 142         NET_CORE=1,
 143         NET_ETHER=2,
 144         NET_802=3,
 145         NET_UNIX=4,
 146         NET_IPV4=5,
 147         NET_IPX=6,
 148         NET_ATALK=7,
 149         NET_NETROM=8,
 150         NET_AX25=9,
 151         NET_BRIDGE=10,
 152         NET_ROSE=11,
 153         NET_IPV6=12,
 154         NET_X25=13,
 155         NET_TR=14,
 156         NET_DECNET=15,
 157         NET_ECONET=16,
 158         NET_KHTTPD=17
 159 };
 160
 161 /* /proc/sys/kernel/random */
 162 enum
 163 {
 164         RANDOM_POOLSIZE=1,
 165         RANDOM_ENTROPY_COUNT=2,
 166         RANDOM_READ_THRESH=3,
 167         RANDOM_WRITE_THRESH=4,
 168         RANDOM_BOOT_ID=5,
 169         RANDOM_UUID=6
 170 };
 171
 172 /* /proc/sys/bus/isa */
 173 enum
 174 {
 175         BUS_ISA_MEM_BASE=1,
 176         BUS_ISA_PORT_BASE=2,
 177         BUS_ISA_PORT_SHIFT=3
 178 };
 179
 180 /* /proc/sys/net/core */
 181 enum
 182 {
 183         NET_CORE_WMEM_MAX=1,
 184         NET_CORE_RMEM_MAX=2,
 185         NET_CORE_WMEM_DEFAULT=3,
 186         NET_CORE_RMEM_DEFAULT=4,
 187 /* was  NET_CORE_DESTROY_DELAY */
 188         NET_CORE_MAX_BACKLOG=6,
 189         NET_CORE_FASTROUTE=7,
 190         NET_CORE_MSG_COST=8,
 191         NET_CORE_MSG_BURST=9,
 192         NET_CORE_OPTMEM_MAX=10,
 193         NET_CORE_HOT_LIST_LENGTH=11,
 194         NET_CORE_DIVERT_VERSION=12,
 195         NET_CORE_NO_CONG_THRESH=13,
 196         NET_CORE_NO_CONG=14,
 197         NET_CORE_LO_CONG=15,
 198         NET_CORE_MOD_CONG=16
 199 };
 200
 201 /* /proc/sys/net/ethernet */
 202
 203 /* /proc/sys/net/802 */
 204
 205 /* /proc/sys/net/unix */
 206
 207 enum
 208 {
 209         NET_UNIX_DESTROY_DELAY=1,
 210         NET_UNIX_DELETE_DELAY=2,
 211         NET_UNIX_MAX_DGRAM_QLEN=3,
 212 };
 213
 214 /* /proc/sys/net/ipv4 */
 215 enum
 216 {
 217         /* v2.0 compatibile variables */
 218         NET_IPV4_FORWARD=8,
 219         NET_IPV4_DYNADDR=9,
 220
 221         NET_IPV4_CONF=16,
 222         NET_IPV4_NEIGH=17,
 223         NET_IPV4_ROUTE=18,
 224         NET_IPV4_FIB_HASH=19,
 225
 226         NET_IPV4_TCP_TIMESTAMPS=33,
 227         NET_IPV4_TCP_WINDOW_SCALING=34,
 228         NET_IPV4_TCP_SACK=35,
 229         NET_IPV4_TCP_RETRANS_COLLAPSE=36,
 230         NET_IPV4_DEFAULT_TTL=37,
 231         NET_IPV4_AUTOCONFIG=38,
 232         NET_IPV4_NO_PMTU_DISC=39,
 233         NET_IPV4_TCP_SYN_RETRIES=40,
 234         NET_IPV4_IPFRAG_HIGH_THRESH=41,
 235         NET_IPV4_IPFRAG_LOW_THRESH=42,
 236         NET_IPV4_IPFRAG_TIME=43,
 237         NET_IPV4_TCP_MAX_KA_PROBES=44,
 238         NET_IPV4_TCP_KEEPALIVE_TIME=45,
 239         NET_IPV4_TCP_KEEPALIVE_PROBES=46,
 240         NET_IPV4_TCP_RETRIES1=47,
 241         NET_IPV4_TCP_RETRIES2=48,
 242         NET_IPV4_TCP_FIN_TIMEOUT=49,
 243         NET_IPV4_IP_MASQ_DEBUG=50,
 244         NET_TCP_SYNCOOKIES=51,
 245         NET_TCP_STDURG=52,
 246         NET_TCP_RFC1337=53,
 247         NET_TCP_SYN_TAILDROP=54,
 248         NET_TCP_MAX_SYN_BACKLOG=55,
 249         NET_IPV4_LOCAL_PORT_RANGE=56,
 250         NET_IPV4_ICMP_ECHO_IGNORE_ALL=57,
 251         NET_IPV4_ICMP_ECHO_IGNORE_BROADCASTS=58,
 252         NET_IPV4_ICMP_SOURCEQUENCH_RATE=59,
 253         NET_IPV4_ICMP_DESTUNREACH_RATE=60,
 254         NET_IPV4_ICMP_TIMEEXCEED_RATE=61,
 255         NET_IPV4_ICMP_PARAMPROB_RATE=62,
 256         NET_IPV4_ICMP_ECHOREPLY_RATE=63,
 257         NET_IPV4_ICMP_IGNORE_BOGUS_ERROR_RESPONSES=64,
 258         NET_IPV4_IGMP_MAX_MEMBERSHIPS=65,
 259         NET_TCP_TW_RECYCLE=66,
 260         NET_IPV4_ALWAYS_DEFRAG=67,
 261         NET_IPV4_TCP_KEEPALIVE_INTVL=68,
 262         NET_IPV4_INET_PEER_THRESHOLD=69,
 263         NET_IPV4_INET_PEER_MINTTL=70,
 264         NET_IPV4_INET_PEER_MAXTTL=71,
 265         NET_IPV4_INET_PEER_GC_MINTIME=72,
 266         NET_IPV4_INET_PEER_GC_MAXTIME=73,
 267         NET_TCP_ORPHAN_RETRIES=74,
 268         NET_TCP_ABORT_ON_OVERFLOW=75,
 269         NET_TCP_SYNACK_RETRIES=76,
 270         NET_TCP_MAX_ORPHANS=77,
 271         NET_TCP_MAX_TW_BUCKETS=78,
 272         NET_TCP_FACK=79,
 273         NET_TCP_REORDERING=80,
 274         NET_TCP_ECN=81,
 275         NET_TCP_DSACK=82,
 276         NET_TCP_MEM=83,
 277         NET_TCP_WMEM=84,
 278         NET_TCP_RMEM=85,
 279         NET_TCP_APP_WIN=86,
 280         NET_TCP_ADV_WIN_SCALE=87,
 281         NET_IPV4_NONLOCAL_BIND=88,
 282 };
 283
 284 enum {
 285         NET_IPV4_ROUTE_FLUSH=1,
 286         NET_IPV4_ROUTE_MIN_DELAY=2,
 287         NET_IPV4_ROUTE_MAX_DELAY=3,
 288         NET_IPV4_ROUTE_GC_THRESH=4,
 289         NET_IPV4_ROUTE_MAX_SIZE=5,
 290         NET_IPV4_ROUTE_GC_MIN_INTERVAL=6,
 291         NET_IPV4_ROUTE_GC_TIMEOUT=7,
 292         NET_IPV4_ROUTE_GC_INTERVAL=8,
 293         NET_IPV4_ROUTE_REDIRECT_LOAD=9,
 294         NET_IPV4_ROUTE_REDIRECT_NUMBER=10,
 295         NET_IPV4_ROUTE_REDIRECT_SILENCE=11,
 296         NET_IPV4_ROUTE_ERROR_COST=12,
 297         NET_IPV4_ROUTE_ERROR_BURST=13,
 298         NET_IPV4_ROUTE_GC_ELASTICITY=14,
 299         NET_IPV4_ROUTE_MTU_EXPIRES=15,
 300         NET_IPV4_ROUTE_MIN_PMTU=16,
 301         NET_IPV4_ROUTE_MIN_ADVMSS=17
 302 };
 303
 304 enum
 305 {
 306         NET_PROTO_CONF_ALL=-2,
 307         NET_PROTO_CONF_DEFAULT=-3
 308
 309         /* And device ifindices ... */
 310 };
 311
 312 enum
 313 {
 314         NET_IPV4_CONF_FORWARDING=1,
 315         NET_IPV4_CONF_MC_FORWARDING=2,
 316         NET_IPV4_CONF_PROXY_ARP=3,
 317         NET_IPV4_CONF_ACCEPT_REDIRECTS=4,
 318         NET_IPV4_CONF_SECURE_REDIRECTS=5,
 319         NET_IPV4_CONF_SEND_REDIRECTS=6,
 320         NET_IPV4_CONF_SHARED_MEDIA=7,
 321         NET_IPV4_CONF_RP_FILTER=8,
 322         NET_IPV4_CONF_ACCEPT_SOURCE_ROUTE=9,
 323         NET_IPV4_CONF_BOOTP_RELAY=10,
 324         NET_IPV4_CONF_LOG_MARTIANS=11,
 325         NET_IPV4_CONF_TAG=12
 326 };
 327
 328 /* /proc/sys/net/ipv6 */
 329 enum {
 330         NET_IPV6_CONF=16,
 331         NET_IPV6_NEIGH=17,
 332         NET_IPV6_ROUTE=18
 333 };
 334
 335 enum {
 336         NET_IPV6_ROUTE_FLUSH=1,
 337         NET_IPV6_ROUTE_GC_THRESH=2,
 338         NET_IPV6_ROUTE_MAX_SIZE=3,
 339         NET_IPV6_ROUTE_GC_MIN_INTERVAL=4,
 340         NET_IPV6_ROUTE_GC_TIMEOUT=5,
 341         NET_IPV6_ROUTE_GC_INTERVAL=6,
 342         NET_IPV6_ROUTE_GC_ELASTICITY=7,
 343         NET_IPV6_ROUTE_MTU_EXPIRES=8,
 344         NET_IPV6_ROUTE_MIN_ADVMSS=9
 345 };
 346
 347 enum {
 348         NET_IPV6_FORWARDING=1,
 349         NET_IPV6_HOP_LIMIT=2,
 350         NET_IPV6_MTU=3,
 351         NET_IPV6_ACCEPT_RA=4,
 352         NET_IPV6_ACCEPT_REDIRECTS=5,
 353         NET_IPV6_AUTOCONF=6,
 354         NET_IPV6_DAD_TRANSMITS=7,
 355         NET_IPV6_RTR_SOLICITS=8,
 356         NET_IPV6_RTR_SOLICIT_INTERVAL=9,
 357         NET_IPV6_RTR_SOLICIT_DELAY=10
 358 };
 359
 360 /* /proc/sys/net/<protocol>/neigh/<dev> */
 361 enum {
 362         NET_NEIGH_MCAST_SOLICIT=1,
 363         NET_NEIGH_UCAST_SOLICIT=2,
 364         NET_NEIGH_APP_SOLICIT=3,
 365         NET_NEIGH_RETRANS_TIME=4,
 366         NET_NEIGH_REACHABLE_TIME=5,
 367         NET_NEIGH_DELAY_PROBE_TIME=6,
 368         NET_NEIGH_GC_STALE_TIME=7,
 369         NET_NEIGH_UNRES_QLEN=8,
 370         NET_NEIGH_PROXY_QLEN=9,
 371         NET_NEIGH_ANYCAST_DELAY=10,
 372         NET_NEIGH_PROXY_DELAY=11,
 373         NET_NEIGH_LOCKTIME=12,
 374         NET_NEIGH_GC_INTERVAL=13,
 375         NET_NEIGH_GC_THRESH1=14,
 376         NET_NEIGH_GC_THRESH2=15,
 377         NET_NEIGH_GC_THRESH3=16
 378 };
 379
 380 /* /proc/sys/net/ipx */
 381
 382
 383 /* /proc/sys/net/appletalk */
 384 enum {
 385         NET_ATALK_AARP_EXPIRY_TIME=1,
 386         NET_ATALK_AARP_TICK_TIME=2,
 387         NET_ATALK_AARP_RETRANSMIT_LIMIT=3,
 388         NET_ATALK_AARP_RESOLVE_TIME=4
 389 };
 390
 391
 392 /* /proc/sys/net/netrom */
 393 enum {
 394         NET_NETROM_DEFAULT_PATH_QUALITY=1,
 395         NET_NETROM_OBSOLESCENCE_COUNT_INITIALISER=2,
 396         NET_NETROM_NETWORK_TTL_INITIALISER=3,
 397         NET_NETROM_TRANSPORT_TIMEOUT=4,
 398         NET_NETROM_TRANSPORT_MAXIMUM_TRIES=5,
 399         NET_NETROM_TRANSPORT_ACKNOWLEDGE_DELAY=6,
 400         NET_NETROM_TRANSPORT_BUSY_DELAY=7,
 401         NET_NETROM_TRANSPORT_REQUESTED_WINDOW_SIZE=8,
 402         NET_NETROM_TRANSPORT_NO_ACTIVITY_TIMEOUT=9,
 403         NET_NETROM_ROUTING_CONTROL=10,
 404         NET_NETROM_LINK_FAILS_COUNT=11
 405 };
 406
 407 /* /proc/sys/net/ax25 */
 408 enum {
 409         NET_AX25_IP_DEFAULT_MODE=1,
 410         NET_AX25_DEFAULT_MODE=2,
 411         NET_AX25_BACKOFF_TYPE=3,
 412         NET_AX25_CONNECT_MODE=4,
 413         NET_AX25_STANDARD_WINDOW=5,
 414         NET_AX25_EXTENDED_WINDOW=6,
 415         NET_AX25_T1_TIMEOUT=7,
 416         NET_AX25_T2_TIMEOUT=8,
 417         NET_AX25_T3_TIMEOUT=9,
 418         NET_AX25_IDLE_TIMEOUT=10,
 419         NET_AX25_N2=11,
 420         NET_AX25_PACLEN=12,
 421         NET_AX25_PROTOCOL=13,
 422         NET_AX25_DAMA_SLAVE_TIMEOUT=14
 423 };
 424
 425 /* /proc/sys/net/rose */
 426 enum {
 427         NET_ROSE_RESTART_REQUEST_TIMEOUT=1,
 428         NET_ROSE_CALL_REQUEST_TIMEOUT=2,
 429         NET_ROSE_RESET_REQUEST_TIMEOUT=3,
 430         NET_ROSE_CLEAR_REQUEST_TIMEOUT=4,
 431         NET_ROSE_ACK_HOLD_BACK_TIMEOUT=5,
 432         NET_ROSE_ROUTING_CONTROL=6,
 433         NET_ROSE_LINK_FAIL_TIMEOUT=7,
 434         NET_ROSE_MAX_VCS=8,
 435         NET_ROSE_WINDOW_SIZE=9,
 436         NET_ROSE_NO_ACTIVITY_TIMEOUT=10
 437 };
 438
 439 /* /proc/sys/net/x25 */
 440 enum {
 441         NET_X25_RESTART_REQUEST_TIMEOUT=1,
 442         NET_X25_CALL_REQUEST_TIMEOUT=2,
 443         NET_X25_RESET_REQUEST_TIMEOUT=3,
 444         NET_X25_CLEAR_REQUEST_TIMEOUT=4,
 445         NET_X25_ACK_HOLD_BACK_TIMEOUT=5
 446 };
 447
 448 /* /proc/sys/net/token-ring */
 449 enum
 450 {
 451         NET_TR_RIF_TIMEOUT=1
 452 };
 453
 454 /* /proc/sys/net/decnet/ */
 455 enum {
 456         NET_DECNET_NODE_TYPE = 1,
 457         NET_DECNET_NODE_ADDRESS = 2,
 458         NET_DECNET_NODE_NAME = 3,
 459         NET_DECNET_DEFAULT_DEVICE = 4,
 460         NET_DECNET_TIME_WAIT = 5,
 461         NET_DECNET_DN_COUNT = 6,
 462         NET_DECNET_DI_COUNT = 7,
 463         NET_DECNET_DR_COUNT = 8,
 464         NET_DECNET_DST_GC_INTERVAL = 9,
 465         NET_DECNET_CONF = 10,
 466         NET_DECNET_DEBUG_LEVEL = 255
 467 };
 468
 469 /* /proc/sys/net/khttpd/ */
 470 enum {
 471         NET_KHTTPD_DOCROOT      = 1,
 472         NET_KHTTPD_START        = 2,
 473         NET_KHTTPD_STOP         = 3,
 474         NET_KHTTPD_UNLOAD       = 4,
 475         NET_KHTTPD_CLIENTPORT   = 5,
 476         NET_KHTTPD_PERMREQ      = 6,
 477         NET_KHTTPD_PERMFORBID   = 7,
 478         NET_KHTTPD_LOGGING      = 8,
 479         NET_KHTTPD_SERVERPORT   = 9,
 480         NET_KHTTPD_DYNAMICSTRING= 10,
 481         NET_KHTTPD_SLOPPYMIME   = 11,
 482         NET_KHTTPD_THREADS      = 12,
 483         NET_KHTTPD_MAXCONNECT   = 13
 484 };
 485
 486 /* /proc/sys/net/decnet/conf/<dev> */
 487 enum {
 488         NET_DECNET_CONF_LOOPBACK = -2,
 489         NET_DECNET_CONF_DDCMP = -3,
 490         NET_DECNET_CONF_PPP = -4,
 491         NET_DECNET_CONF_X25 = -5,
 492         NET_DECNET_CONF_GRE = -6,
 493         NET_DECNET_CONF_ETHER = -7
 494
 495         /* ... and ifindex of devices */
 496 };
 497
 498 /* /proc/sys/net/decnet/conf/<dev>/ */
 499 enum {
 500         NET_DECNET_CONF_DEV_PRIORITY = 1,
 501         NET_DECNET_CONF_DEV_T1 = 2,
 502         NET_DECNET_CONF_DEV_T2 = 3,
 503         NET_DECNET_CONF_DEV_T3 = 4,
 504         NET_DECNET_CONF_DEV_FORWARDING = 5,
 505         NET_DECNET_CONF_DEV_BLKSIZE = 6,
 506         NET_DECNET_CONF_DEV_STATE = 7
 507 };
 508
 509 /* CTL_PROC names: */
 510
 511 /* CTL_FS names: */
 512 enum
 513 {
 514         FS_NRINODE=1,   /* int:current number of allocated inodes */
 515         FS_STATINODE=2,
 516         FS_MAXINODE=3,  /* int:maximum number of inodes that can be allocated */
 517         FS_NRDQUOT=4,   /* int:current number of allocated dquots */
 518         FS_MAXDQUOT=5,  /* int:maximum number of dquots that can be allocated */
 519         FS_NRFILE=6,    /* int:current number of allocated filedescriptors */
 520         FS_MAXFILE=7,   /* int:maximum number of filedescriptors that can be allocated */
 521         FS_DENTRY=8,
 522         FS_NRSUPER=9,   /* int:current number of allocated super_blocks */
 523         FS_MAXSUPER=10, /* int:maximum number of super_blocks that can be allocated */
 524         FS_OVERFLOWUID=11,      /* int: overflow UID */
 525         FS_OVERFLOWGID=12,      /* int: overflow GID */
 526         FS_LEASES=13,   /* int: leases enabled */
 527         FS_DIR_NOTIFY=14,       /* int: directory notification enabled */
 528         FS_LEASE_TIME=15,       /* int: maximum time to wait for a lease break */
 529 };
 530
 531 /* CTL_DEBUG names: */
 532
 533 /* CTL_DEV names: */
 534 enum {
 535         DEV_CDROM=1,
 536         DEV_HWMON=2,
 537         DEV_PARPORT=3,
 538         DEV_RAID=4,
 539         DEV_MAC_HID=5
 540 };
 541
 542 /* /proc/sys/dev/cdrom */
 543 enum {
 544         DEV_CDROM_INFO=1,
 545         DEV_CDROM_AUTOCLOSE=2,
 546         DEV_CDROM_AUTOEJECT=3,
 547         DEV_CDROM_DEBUG=4,
 548         DEV_CDROM_LOCK=5,
 549         DEV_CDROM_CHECK_MEDIA=6
 550 };
 551
 552 /* /proc/sys/dev/parport */
 553 enum {
 554         DEV_PARPORT_DEFAULT=-3
 555 };
 556
 557 /* /proc/sys/dev/raid */
 558 enum {
 559         DEV_RAID_SPEED_LIMIT_MIN=1,
 560         DEV_RAID_SPEED_LIMIT_MAX=2
 561 };
 562
 563 /* /proc/sys/dev/parport/default */
 564 enum {
 565         DEV_PARPORT_DEFAULT_TIMESLICE=1,
 566         DEV_PARPORT_DEFAULT_SPINTIME=2
 567 };
 568
 569 /* /proc/sys/dev/parport/parport n */
 570 enum {
 571         DEV_PARPORT_SPINTIME=1,
 572         DEV_PARPORT_BASE_ADDR=2,
 573         DEV_PARPORT_IRQ=3,
 574         DEV_PARPORT_DMA=4,
 575         DEV_PARPORT_MODES=5,
 576         DEV_PARPORT_DEVICES=6,
 577         DEV_PARPORT_AUTOPROBE=16
 578 };
 579
 580 /* /proc/sys/dev/parport/parport n/devices/ */
 581 enum {
 582         DEV_PARPORT_DEVICES_ACTIVE=-3,
 583 };
 584
 585 /* /proc/sys/dev/parport/parport n/devices/device n */
 586 enum {
 587         DEV_PARPORT_DEVICE_TIMESLICE=1,
 588 };
 589
 590 /* /proc/sys/dev/mac_hid */
 591 enum {
 592         DEV_MAC_HID_KEYBOARD_SENDS_LINUX_KEYCODES=1,
 593         DEV_MAC_HID_KEYBOARD_LOCK_KEYCODES=2,
 594         DEV_MAC_HID_MOUSE_BUTTON_EMULATION=3,
 595         DEV_MAC_HID_MOUSE_BUTTON2_KEYCODE=4,
 596         DEV_MAC_HID_MOUSE_BUTTON3_KEYCODE=5,
 597         DEV_MAC_HID_ADB_MOUSE_SENDS_KEYCODES=6
 598 };
 599
 600 #ifdef __KERNEL__
 601
 602 extern asmlinkage long sys_sysctl(struct __sysctl_args *);
 603 extern void sysctl_init(void);
 604
 605 typedef struct ctl_table ctl_table;
 606
 607 typedef int ctl_handler (ctl_table *table, int *name, int nlen,
 608                          void *oldval, size_t *oldlenp,
 609                          void *newval, size_t newlen,
 610                          void **context);
 611
 612 typedef int proc_handler (ctl_table *ctl, int write, struct file * filp,
 613                           void *buffer, size_t *lenp);
 614
 615 extern int proc_dostring(ctl_table *, int, struct file *,
 616                          void *, size_t *);
 617 extern int proc_dointvec(ctl_table *, int, struct file *,
 618                          void *, size_t *);
 619 extern int proc_dointvec_bset(ctl_table *, int, struct file *,
 620                               void *, size_t *);
 621 extern int proc_dointvec_minmax(ctl_table *, int, struct file *,
 622                                 void *, size_t *);
 623 extern int proc_dointvec_jiffies(ctl_table *, int, struct file *,
 624                                  void *, size_t *);
 625 extern int proc_doulongvec_minmax(ctl_table *, int, struct file *,
 626                                   void *, size_t *);
 627 extern int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int,
 628                                       struct file *, void *, size_t *);
 629
 630 extern int do_sysctl (int *name, int nlen,
 631                       void *oldval, size_t *oldlenp,
 632                       void *newval, size_t newlen);
 633
 634 extern int do_sysctl_strategy (ctl_table *table,
 635                                int *name, int nlen,
 636                                void *oldval, size_t *oldlenp,
 637                                void *newval, size_t newlen, void ** context);
 638
 639 extern ctl_handler sysctl_string;
 640 extern ctl_handler sysctl_intvec;
 641 extern ctl_handler sysctl_jiffies;
 642
 643
 644 /*
 645  * Register a set of sysctl names by calling register_sysctl_table
 646  * with an initialised array of ctl_table's.  An entry with zero
 647  * ctl_name terminates the table.  table->de will be set up by the
 648  * registration and need not be initialised in advance.
 649  *
 650  * sysctl names can be mirrored automatically under /proc/sys.  The
 651  * procname supplied controls /proc naming.
 652  *
 653  * The table's mode will be honoured both for sys_sysctl(2) and
 654  * proc-fs access.
 655  *
 656  * Leaf nodes in the sysctl tree will be represented by a single file
 657  * under /proc; non-leaf nodes will be represented by directories.  A
 658  * null procname disables /proc mirroring at this node.
 659  *
 660  * sysctl(2) can automatically manage read and write requests through
 661  * the sysctl table.  The data and maxlen fields of the ctl_table
 662  * struct enable minimal validation of the values being written to be
 663  * performed, and the mode field allows minimal authentication.
 664  *
 665  * More sophisticated management can be enabled by the provision of a
 666  * strategy routine with the table entry.  This will be called before
 667  * any automatic read or write of the data is performed.
 668  *
 669  * The strategy routine may return:
 670  * <0: Error occurred (error is passed to user process)
 671  * 0:  OK - proceed with automatic read or write.
 672  * >0: OK - read or write has been done by the strategy routine, so
 673  *     return immediately.
 674  *
 675  * There must be a proc_handler routine for any terminal nodes
 676  * mirrored under /proc/sys (non-terminals are handled by a built-in
 677  * directory handler).  Several default handlers are available to
 678  * cover common cases.
 679  */
 680
 681 /* A sysctl table is an array of struct ctl_table: */
 682 struct ctl_table
 683 {
 684         int ctl_name;                   /* Binary ID */
 685         const char *procname;           /* Text ID for /proc/sys, or zero */
 686         void *data;
 687         int maxlen;
 688         mode_t mode;
 689         ctl_table *child;
 690         proc_handler *proc_handler;     /* Callback for text formatting */
 691         ctl_handler *strategy;          /* Callback function for all r/w */
 692         struct proc_dir_entry *de;      /* /proc control block */
 693         void *extra1;
 694         void *extra2;
 695 };
 696
 697 /* struct ctl_table_header is used to maintain dynamic lists of
 698    ctl_table trees. */
 699 struct ctl_table_header
 700 {
 701         ctl_table *ctl_table;
 702         struct list_head ctl_entry;
 703 };
 704
 705 struct ctl_table_header * register_sysctl_table(ctl_table * table,
 706                                                 int insert_at_head);
 707 void unregister_sysctl_table(struct ctl_table_header * table);
 708
 709 #else /* __KERNEL__ */
 710
 711 #endif /* __KERNEL__ */
 712
 713 #endif /* _LINUX_SYSCTL_H */