src/redis.h

   1 #ifndef __REDIS_H
   2 #define __REDIS_H
   3
   4 #include "fmacros.h"
   5 #include "config.h"
   6
   7 #if defined(__sun)
   8 #include "solarisfixes.h"
   9 #endif
  10
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <string.h>
  14 #include <time.h>
  15 #include <limits.h>
  16 #include <unistd.h>
  17 #include <errno.h>
  18 #include <inttypes.h>
  19 #include <pthread.h>
  20 #include <syslog.h>
  21
  22 #include "ae.h"     /* Event driven programming library */
  23 #include "sds.h"    /* Dynamic safe strings */
  24 #include "dict.h"   /* Hash tables */
  25 #include "adlist.h" /* Linked lists */
  26 #include "zmalloc.h" /* total memory usage aware version of malloc/free */
  27 #include "anet.h"   /* Networking the easy way */
  28 #include "zipmap.h" /* Compact string -> string data structure */
  29 #include "ziplist.h" /* Compact list data structure */
  30 #include "intset.h" /* Compact integer set structure */
  31 #include "version.h"
  32
  33 /* Error codes */
  34 #define REDIS_OK                0
  35 #define REDIS_ERR               -1
  36
  37 /* Static server configuration */
  38 #define REDIS_SERVERPORT        6379    /* TCP port */
  39 #define REDIS_MAXIDLETIME       (60*5)  /* default client timeout */
  40 #define REDIS_IOBUF_LEN         1024
  41 #define REDIS_LOADBUF_LEN       1024
  42 #define REDIS_STATIC_ARGS       8
  43 #define REDIS_DEFAULT_DBNUM     16
  44 #define REDIS_CONFIGLINE_MAX    1024
  45 #define REDIS_MAX_SYNC_TIME     60      /* Slave can't take more to sync */
  46 #define REDIS_EXPIRELOOKUPS_PER_CRON    10 /* lookup 10 expires per loop */
  47 #define REDIS_MAX_WRITE_PER_EVENT (1024*64)
  48 #define REDIS_REQUEST_MAX_SIZE (1024*1024*256) /* max bytes in inline command */
  49 #define REDIS_SHARED_INTEGERS 10000
  50 #define REDIS_REPLY_CHUNK_BYTES (5*1500) /* 5 TCP packets with default MTU */
  51 #define REDIS_MAX_LOGMSG_LEN    1024 /* Default maximum length of syslog messages */
  52
  53 /* If more then REDIS_WRITEV_THRESHOLD write packets are pending use writev */
  54 #define REDIS_WRITEV_THRESHOLD      3
  55 /* Max number of iovecs used for each writev call */
  56 #define REDIS_WRITEV_IOVEC_COUNT    256
  57
  58 /* Hash table parameters */
  59 #define REDIS_HT_MINFILL        10      /* Minimal hash table fill 10% */
  60
  61 /* Command flags:
  62  *   REDIS_CMD_DENYOOM:
  63  *     Commands marked with this flag will return an error when 'maxmemory' is
  64  *     set and the server is using more than 'maxmemory' bytes of memory.
  65  *     In short: commands with this flag are denied on low memory conditions.
  66  *   REDIS_CMD_FORCE_REPLICATION:
  67  *     Force replication even if dirty is 0. */
  68 #define REDIS_CMD_DENYOOM 4
  69 #define REDIS_CMD_FORCE_REPLICATION 8
  70
  71 /* Object types */
  72 #define REDIS_STRING 0
  73 #define REDIS_LIST 1
  74 #define REDIS_SET 2
  75 #define REDIS_ZSET 3
  76 #define REDIS_HASH 4
  77 #define REDIS_VMPOINTER 8
  78
  79 /* Objects encoding. Some kind of objects like Strings and Hashes can be
  80  * internally represented in multiple ways. The 'encoding' field of the object
  81  * is set to one of this fields for this object. */
  82 #define REDIS_ENCODING_RAW 0     /* Raw representation */
  83 #define REDIS_ENCODING_INT 1     /* Encoded as integer */
  84 #define REDIS_ENCODING_HT 2      /* Encoded as hash table */
  85 #define REDIS_ENCODING_ZIPMAP 3  /* Encoded as zipmap */
  86 #define REDIS_ENCODING_LINKEDLIST 4 /* Encoded as regular linked list */
  87 #define REDIS_ENCODING_ZIPLIST 5 /* Encoded as ziplist */
  88 #define REDIS_ENCODING_INTSET 6  /* Encoded as intset */
  89
  90 /* Object types only used for dumping to disk */
  91 #define REDIS_EXPIRETIME 253
  92 #define REDIS_SELECTDB 254
  93 #define REDIS_EOF 255
  94
  95 /* Defines related to the dump file format. To store 32 bits lengths for short
  96  * keys requires a lot of space, so we check the most significant 2 bits of
  97  * the first byte to interpreter the length:
  98  *
  99  * 00|000000 => if the two MSB are 00 the len is the 6 bits of this byte
 100  * 01|000000 00000000 =>  01, the len is 14 byes, 6 bits + 8 bits of next byte
 101  * 10|000000 [32 bit integer] => if it's 01, a full 32 bit len will follow
 102  * 11|000000 this means: specially encoded object will follow. The six bits
 103  *           number specify the kind of object that follows.
 104  *           See the REDIS_RDB_ENC_* defines.
 105  *
 106  * Lenghts up to 63 are stored using a single byte, most DB keys, and may
 107  * values, will fit inside. */
 108 #define REDIS_RDB_6BITLEN 0
 109 #define REDIS_RDB_14BITLEN 1
 110 #define REDIS_RDB_32BITLEN 2
 111 #define REDIS_RDB_ENCVAL 3
 112 #define REDIS_RDB_LENERR UINT_MAX
 113
 114 /* When a length of a string object stored on disk has the first two bits
 115  * set, the remaining two bits specify a special encoding for the object
 116  * accordingly to the following defines: */
 117 #define REDIS_RDB_ENC_INT8 0        /* 8 bit signed integer */
 118 #define REDIS_RDB_ENC_INT16 1       /* 16 bit signed integer */
 119 #define REDIS_RDB_ENC_INT32 2       /* 32 bit signed integer */
 120 #define REDIS_RDB_ENC_LZF 3         /* string compressed with FASTLZ */
 121
 122 /* Virtual memory object->where field. */
 123 #define REDIS_VM_MEMORY 0       /* The object is on memory */
 124 #define REDIS_VM_SWAPPED 1      /* The object is on disk */
 125 #define REDIS_VM_SWAPPING 2     /* Redis is swapping this object on disk */
 126 #define REDIS_VM_LOADING 3      /* Redis is loading this object from disk */
 127
 128 /* Virtual memory static configuration stuff.
 129  * Check vmFindContiguousPages() to know more about this magic numbers. */
 130 #define REDIS_VM_MAX_NEAR_PAGES 65536
 131 #define REDIS_VM_MAX_RANDOM_JUMP 4096
 132 #define REDIS_VM_MAX_THREADS 32
 133 #define REDIS_THREAD_STACK_SIZE (1024*1024*4)
 134 /* The following is the *percentage* of completed I/O jobs to process when the
 135  * handelr is called. While Virtual Memory I/O operations are performed by
 136  * threads, this operations must be processed by the main thread when completed
 137  * in order to take effect. */
 138 #define REDIS_MAX_COMPLETED_JOBS_PROCESSED 1
 139
 140 /* Client flags */
 141 #define REDIS_SLAVE 1       /* This client is a slave server */
 142 #define REDIS_MASTER 2      /* This client is a master server */
 143 #define REDIS_MONITOR 4     /* This client is a slave monitor, see MONITOR */
 144 #define REDIS_MULTI 8       /* This client is in a MULTI context */
 145 #define REDIS_BLOCKED 16    /* The client is waiting in a blocking operation */
 146 #define REDIS_IO_WAIT 32    /* The client is waiting for Virtual Memory I/O */
 147 #define REDIS_DIRTY_CAS 64  /* Watched keys modified. EXEC will fail. */
 148 #define REDIS_CLOSE_AFTER_REPLY 128 /* Close after writing entire reply. */
 149
 150 /* Client request types */
 151 #define REDIS_REQ_INLINE 1
 152 #define REDIS_REQ_MULTIBULK 2
 153
 154 /* Slave replication state - slave side */
 155 #define REDIS_REPL_NONE 0   /* No active replication */
 156 #define REDIS_REPL_CONNECT 1    /* Must connect to master */
 157 #define REDIS_REPL_TRANSFER 2    /* Receiving .rdb from master */
 158 #define REDIS_REPL_CONNECTED 3  /* Connected to master */
 159
 160 /* Slave replication state - from the point of view of master
 161  * Note that in SEND_BULK and ONLINE state the slave receives new updates
 162  * in its output queue. In the WAIT_BGSAVE state instead the server is waiting
 163  * to start the next background saving in order to send updates to it. */
 164 #define REDIS_REPL_WAIT_BGSAVE_START 3 /* master waits bgsave to start feeding it */
 165 #define REDIS_REPL_WAIT_BGSAVE_END 4 /* master waits bgsave to start bulk DB transmission */
 166 #define REDIS_REPL_SEND_BULK 5 /* master is sending the bulk DB */
 167 #define REDIS_REPL_ONLINE 6 /* bulk DB already transmitted, receive updates */
 168
 169 /* List related stuff */
 170 #define REDIS_HEAD 0
 171 #define REDIS_TAIL 1
 172
 173 /* Sort operations */
 174 #define REDIS_SORT_GET 0
 175 #define REDIS_SORT_ASC 1
 176 #define REDIS_SORT_DESC 2
 177 #define REDIS_SORTKEY_MAX 1024
 178
 179 /* Log levels */
 180 #define REDIS_DEBUG 0
 181 #define REDIS_VERBOSE 1
 182 #define REDIS_NOTICE 2
 183 #define REDIS_WARNING 3
 184
 185 /* Anti-warning macro... */
 186 #define REDIS_NOTUSED(V) ((void) V)
 187
 188 #define ZSKIPLIST_MAXLEVEL 32 /* Should be enough for 2^32 elements */
 189 #define ZSKIPLIST_P 0.25      /* Skiplist P = 1/4 */
 190
 191 /* Append only defines */
 192 #define APPENDFSYNC_NO 0
 193 #define APPENDFSYNC_ALWAYS 1
 194 #define APPENDFSYNC_EVERYSEC 2
 195
 196 /* Zip structure related defaults */
 197 #define REDIS_HASH_MAX_ZIPMAP_ENTRIES 64
 198 #define REDIS_HASH_MAX_ZIPMAP_VALUE 512
 199 #define REDIS_LIST_MAX_ZIPLIST_ENTRIES 512
 200 #define REDIS_LIST_MAX_ZIPLIST_VALUE 64
 201 #define REDIS_SET_MAX_INTSET_ENTRIES 512
 202
 203 /* Sets operations codes */
 204 #define REDIS_OP_UNION 0
 205 #define REDIS_OP_DIFF 1
 206 #define REDIS_OP_INTER 2
 207
 208 /* Redis maxmemory strategies */
 209 #define REDIS_MAXMEMORY_VOLATILE_LRU 0
 210 #define REDIS_MAXMEMORY_VOLATILE_TTL 1
 211 #define REDIS_MAXMEMORY_VOLATILE_RANDOM 2
 212 #define REDIS_MAXMEMORY_ALLKEYS_LRU 3
 213 #define REDIS_MAXMEMORY_ALLKEYS_RANDOM 4
 214 #define REDIS_MAXMEMORY_NO_EVICTION 5
 215
 216 /* We can print the stacktrace, so our assert is defined this way: */
 217 #define redisAssert(_e) ((_e)?(void)0 : (_redisAssert(#_e,__FILE__,__LINE__),_exit(1)))
 218 #define redisPanic(_e) _redisPanic(#_e,__FILE__,__LINE__),_exit(1)
 219 void _redisAssert(char *estr, char *file, int line);
 220 void _redisPanic(char *msg, char *file, int line);
 221
 222 /*-----------------------------------------------------------------------------
 223  * Data types
 224  *----------------------------------------------------------------------------*/
 225
 226 /* A redis object, that is a type able to hold a string / list / set */
 227
 228 /* The actual Redis Object */
 229 #define REDIS_LRU_CLOCK_MAX ((1<<21)-1) /* Max value of obj->lru */
 230 #define REDIS_LRU_CLOCK_RESOLUTION 10 /* LRU clock resolution in seconds */
 231 typedef struct redisObject {
 232     unsigned type:4;
 233     unsigned storage:2;     /* REDIS_VM_MEMORY or REDIS_VM_SWAPPING */
 234     unsigned encoding:4;
 235     unsigned lru:22;        /* lru time (relative to server.lruclock) */
 236     int refcount;
 237     void *ptr;
 238     /* VM fields are only allocated if VM is active, otherwise the
 239      * object allocation function will just allocate
 240      * sizeof(redisObjct) minus sizeof(redisObjectVM), so using
 241      * Redis without VM active will not have any overhead. */
 242 } robj;
 243
 244 /* The VM pointer structure - identifies an object in the swap file.
 245  *
 246  * This object is stored in place of the value
 247  * object in the main key->value hash table representing a database.
 248  * Note that the first fields (type, storage) are the same as the redisObject
 249  * structure so that vmPointer strucuters can be accessed even when casted
 250  * as redisObject structures.
 251  *
 252  * This is useful as we don't know if a value object is or not on disk, but we
 253  * are always able to read obj->storage to check this. For vmPointer
 254  * structures "type" is set to REDIS_VMPOINTER (even if without this field
 255  * is still possible to check the kind of object from the value of 'storage').*/
 256 typedef struct vmPointer {
 257     unsigned type:4;
 258     unsigned storage:2; /* REDIS_VM_SWAPPED or REDIS_VM_LOADING */
 259     unsigned notused:26;
 260     unsigned int vtype; /* type of the object stored in the swap file */
 261     off_t page;         /* the page at witch the object is stored on disk */
 262     off_t usedpages;    /* number of pages used on disk */
 263 } vmpointer;
 264
 265 /* Macro used to initalize a Redis object allocated on the stack.
 266  * Note that this macro is taken near the structure definition to make sure
 267  * we'll update it when the structure is changed, to avoid bugs like
 268  * bug #85 introduced exactly in this way. */
 269 #define initStaticStringObject(_var,_ptr) do { \
 270     _var.refcount = 1; \
 271     _var.type = REDIS_STRING; \
 272     _var.encoding = REDIS_ENCODING_RAW; \
 273     _var.ptr = _ptr; \
 274     _var.storage = REDIS_VM_MEMORY; \
 275 } while(0);
 276
 277 typedef struct redisDb {
 278     dict *dict;                 /* The keyspace for this DB */
 279     dict *expires;              /* Timeout of keys with a timeout set */
 280     dict *blocking_keys;        /* Keys with clients waiting for data (BLPOP) */
 281     dict *io_keys;              /* Keys with clients waiting for VM I/O */
 282     dict *watched_keys;         /* WATCHED keys for MULTI/EXEC CAS */
 283     int id;
 284 } redisDb;
 285
 286 /* Client MULTI/EXEC state */
 287 typedef struct multiCmd {
 288     robj **argv;
 289     int argc;
 290     struct redisCommand *cmd;
 291 } multiCmd;
 292
 293 typedef struct multiState {
 294     multiCmd *commands;     /* Array of MULTI commands */
 295     int count;              /* Total number of MULTI commands */
 296 } multiState;
 297
 298 typedef struct blockingState {
 299     robj **keys;            /* The key we are waiting to terminate a blocking
 300                              * operation such as BLPOP. Otherwise NULL. */
 301     int count;              /* Number of blocking keys */
 302     time_t timeout;         /* Blocking operation timeout. If UNIX current time
 303                              * is >= timeout then the operation timed out. */
 304     robj *target;           /* The key that should receive the element,
 305                              * for BRPOPLPUSH. */
 306 } blockingState;
 307
 308 /* With multiplexing we need to take per-clinet state.
 309  * Clients are taken in a liked list. */
 310 typedef struct redisClient {
 311     int fd;
 312     redisDb *db;
 313     int dictid;
 314     sds querybuf;
 315     int argc;
 316     robj **argv;
 317     int reqtype;
 318     int multibulklen;       /* number of multi bulk arguments left to read */
 319     long bulklen;           /* length of bulk argument in multi bulk request */
 320     list *reply;
 321     int sentlen;
 322     time_t lastinteraction; /* time of the last interaction, used for timeout */
 323     int flags;              /* REDIS_SLAVE | REDIS_MONITOR | REDIS_MULTI ... */
 324     int slaveseldb;         /* slave selected db, if this client is a slave */
 325     int authenticated;      /* when requirepass is non-NULL */
 326     int replstate;          /* replication state if this is a slave */
 327     int repldbfd;           /* replication DB file descriptor */
 328     long repldboff;         /* replication DB file offset */
 329     off_t repldbsize;       /* replication DB file size */
 330     multiState mstate;      /* MULTI/EXEC state */
 331     blockingState bpop;   /* blocking state */
 332     list *io_keys;          /* Keys this client is waiting to be loaded from the
 333                              * swap file in order to continue. */
 334     list *watched_keys;     /* Keys WATCHED for MULTI/EXEC CAS */
 335     dict *pubsub_channels;  /* channels a client is interested in (SUBSCRIBE) */
 336     list *pubsub_patterns;  /* patterns a client is interested in (SUBSCRIBE) */
 337
 338     /* Response buffer */
 339     int bufpos;
 340     char buf[REDIS_REPLY_CHUNK_BYTES];
 341 } redisClient;
 342
 343 struct saveparam {
 344     time_t seconds;
 345     int changes;
 346 };
 347
 348 struct sharedObjectsStruct {
 349     robj *crlf, *ok, *err, *emptybulk, *czero, *cone, *cnegone, *pong, *space,
 350     *colon, *nullbulk, *nullmultibulk, *queued,
 351     *emptymultibulk, *wrongtypeerr, *nokeyerr, *syntaxerr, *sameobjecterr,
 352     *outofrangeerr, *loadingerr, *plus,
 353     *select0, *select1, *select2, *select3, *select4,
 354     *select5, *select6, *select7, *select8, *select9,
 355     *messagebulk, *pmessagebulk, *subscribebulk, *unsubscribebulk, *mbulk3,
 356     *mbulk4, *psubscribebulk, *punsubscribebulk,
 357     *integers[REDIS_SHARED_INTEGERS];
 358 };
 359
 360 /* Global server state structure */
 361 struct redisServer {
 362     pthread_t mainthread;
 363     int port;
 364     char *bindaddr;
 365     char *unixsocket;
 366     int ipfd;
 367     int sofd;
 368     redisDb *db;
 369     long long dirty;            /* changes to DB from the last save */
 370     long long dirty_before_bgsave; /* used to restore dirty on failed BGSAVE */
 371     list *clients;
 372     dict *commands;             /* Command table hahs table */
 373     /* RDB / AOF loading information */
 374     int loading;
 375     off_t loading_total_bytes;
 376     off_t loading_loaded_bytes;
 377     time_t loading_start_time;
 378     /* Fast pointers to often looked up command */
 379     struct redisCommand *delCommand, *multiCommand;
 380     list *slaves, *monitors;
 381     char neterr[ANET_ERR_LEN];
 382     aeEventLoop *el;
 383     int cronloops;              /* number of times the cron function run */
 384     time_t lastsave;                /* Unix time of last save succeeede */
 385     /* Fields used only for stats */
 386     time_t stat_starttime;          /* server start time */
 387     long long stat_numcommands;     /* number of processed commands */
 388     long long stat_numconnections;  /* number of connections received */
 389     long long stat_expiredkeys;     /* number of expired keys */
 390     long long stat_keyspace_hits;   /* number of successful lookups of keys */
 391     long long stat_keyspace_misses; /* number of failed lookups of keys */
 392     /* Configuration */
 393     int verbosity;
 394     int glueoutputbuf;
 395     int maxidletime;
 396     int dbnum;
 397     int daemonize;
 398     int appendonly;
 399     int appendfsync;
 400     int no_appendfsync_on_rewrite;
 401     int shutdown_asap;
 402     time_t lastfsync;
 403     int appendfd;
 404     int appendseldb;
 405     char *pidfile;
 406     pid_t bgsavechildpid;
 407     pid_t bgrewritechildpid;
 408     sds bgrewritebuf; /* buffer taken by parent during oppend only rewrite */
 409     sds aofbuf;       /* AOF buffer, written before entering the event loop */
 410     struct saveparam *saveparams;
 411     int saveparamslen;
 412     char *logfile;
 413     int syslog_enabled;
 414     char *syslog_ident;
 415     int syslog_facility;
 416     char *dbfilename;
 417     char *appendfilename;
 418     char *requirepass;
 419     int rdbcompression;
 420     int activerehashing;
 421     /* Replication related */
 422     int isslave;
 423     /* Slave specific fields */
 424     char *masterauth;
 425     char *masterhost;
 426     int masterport;
 427     redisClient *master;    /* client that is master for this slave */
 428     int replstate;          /* replication status if the instance is a slave */
 429     off_t repl_transfer_left;  /* bytes left reading .rdb  */
 430     int repl_transfer_s;    /* slave -> master SYNC socket */
 431     int repl_transfer_fd;   /* slave -> master SYNC temp file descriptor */
 432     char *repl_transfer_tmpfile; /* slave-> master SYNC temp file name */
 433     time_t repl_transfer_lastio; /* unix time of the latest read, for timeout */
 434     int repl_serve_stale_data; /* Serve stale data when link is down? */
 435     /* Limits */
 436     unsigned int maxclients;
 437     unsigned long long maxmemory;
 438     int maxmemory_policy;
 439     int maxmemory_samples;
 440     /* Blocked clients */
 441     unsigned int bpop_blocked_clients;
 442     unsigned int vm_blocked_clients;
 443     list *unblocked_clients;
 444     /* Sort parameters - qsort_r() is only available under BSD so we
 445      * have to take this state global, in order to pass it to sortCompare() */
 446     int sort_desc;
 447     int sort_alpha;
 448     int sort_bypattern;
 449     /* Virtual memory configuration */
 450     int vm_enabled;
 451     char *vm_swap_file;
 452     off_t vm_page_size;
 453     off_t vm_pages;
 454     unsigned long long vm_max_memory;
 455     /* Zip structure config */
 456     size_t hash_max_zipmap_entries;
 457     size_t hash_max_zipmap_value;
 458     size_t list_max_ziplist_entries;
 459     size_t list_max_ziplist_value;
 460     size_t set_max_intset_entries;
 461     /* Virtual memory state */
 462     FILE *vm_fp;
 463     int vm_fd;
 464     off_t vm_next_page; /* Next probably empty page */
 465     off_t vm_near_pages; /* Number of pages allocated sequentially */
 466     unsigned char *vm_bitmap; /* Bitmap of free/used pages */
 467     time_t unixtime;    /* Unix time sampled every second. */
 468     /* Virtual memory I/O threads stuff */
 469     /* An I/O thread process an element taken from the io_jobs queue and
 470      * put the result of the operation in the io_done list. While the
 471      * job is being processed, it's put on io_processing queue. */
 472     list *io_newjobs; /* List of VM I/O jobs yet to be processed */
 473     list *io_processing; /* List of VM I/O jobs being processed */
 474     list *io_processed; /* List of VM I/O jobs already processed */
 475     list *io_ready_clients; /* Clients ready to be unblocked. All keys loaded */
 476     pthread_mutex_t io_mutex; /* lock to access io_jobs/io_done/io_thread_job */
 477     pthread_mutex_t io_swapfile_mutex; /* So we can lseek + write */
 478     pthread_attr_t io_threads_attr; /* attributes for threads creation */
 479     int io_active_threads; /* Number of running I/O threads */
 480     int vm_max_threads; /* Max number of I/O threads running at the same time */
 481     /* Our main thread is blocked on the event loop, locking for sockets ready
 482      * to be read or written, so when a threaded I/O operation is ready to be
 483      * processed by the main thread, the I/O thread will use a unix pipe to
 484      * awake the main thread. The followings are the two pipe FDs. */
 485     int io_ready_pipe_read;
 486     int io_ready_pipe_write;
 487     /* Virtual memory stats */
 488     unsigned long long vm_stats_used_pages;
 489     unsigned long long vm_stats_swapped_objects;
 490     unsigned long long vm_stats_swapouts;
 491     unsigned long long vm_stats_swapins;
 492     /* Pubsub */
 493     dict *pubsub_channels; /* Map channels to list of subscribed clients */
 494     list *pubsub_patterns; /* A list of pubsub_patterns */
 495     /* Misc */
 496     unsigned lruclock:22;        /* clock incrementing every minute, for LRU */
 497     unsigned lruclock_padding:10;
 498 };
 499
 500 typedef struct pubsubPattern {
 501     redisClient *client;
 502     robj *pattern;
 503 } pubsubPattern;
 504
 505 typedef void redisCommandProc(redisClient *c);
 506 typedef void redisVmPreloadProc(redisClient *c, struct redisCommand *cmd, int argc, robj **argv);
 507 struct redisCommand {
 508     char *name;
 509     redisCommandProc *proc;
 510     int arity;
 511     int flags;
 512     /* Use a function to determine which keys need to be loaded
 513      * in the background prior to executing this command. Takes precedence
 514      * over vm_firstkey and others, ignored when NULL */
 515     redisVmPreloadProc *vm_preload_proc;
 516     /* What keys should be loaded in background when calling this command? */
 517     int vm_firstkey; /* The first argument that's a key (0 = no keys) */
 518     int vm_lastkey;  /* THe last argument that's a key */
 519     int vm_keystep;  /* The step between first and last key */
 520 };
 521
 522 struct redisFunctionSym {
 523     char *name;
 524     unsigned long pointer;
 525 };
 526
 527 typedef struct _redisSortObject {
 528     robj *obj;
 529     union {
 530         double score;
 531         robj *cmpobj;
 532     } u;
 533 } redisSortObject;
 534
 535 typedef struct _redisSortOperation {
 536     int type;
 537     robj *pattern;
 538 } redisSortOperation;
 539
 540 /* ZSETs use a specialized version of Skiplists */
 541 typedef struct zskiplistNode {
 542     robj *obj;
 543     double score;
 544     struct zskiplistNode *backward;
 545     struct zskiplistLevel {
 546         struct zskiplistNode *forward;
 547         unsigned int span;
 548     } level[];
 549 } zskiplistNode;
 550
 551 typedef struct zskiplist {
 552     struct zskiplistNode *header, *tail;
 553     unsigned long length;
 554     int level;
 555 } zskiplist;
 556
 557 typedef struct zset {
 558     dict *dict;
 559     zskiplist *zsl;
 560 } zset;
 561
 562 /* VM threaded I/O request message */
 563 #define REDIS_IOJOB_LOAD 0          /* Load from disk to memory */
 564 #define REDIS_IOJOB_PREPARE_SWAP 1  /* Compute needed pages */
 565 #define REDIS_IOJOB_DO_SWAP 2       /* Swap from memory to disk */
 566 typedef struct iojob {
 567     int type;   /* Request type, REDIS_IOJOB_* */
 568     redisDb *db;/* Redis database */
 569     robj *key;  /* This I/O request is about swapping this key */
 570     robj *id;   /* Unique identifier of this job:
 571                    this is the object to swap for REDIS_IOREQ_*_SWAP, or the
 572                    vmpointer objct for REDIS_IOREQ_LOAD. */
 573     robj *val;  /* the value to swap for REDIS_IOREQ_*_SWAP, otherwise this
 574                  * field is populated by the I/O thread for REDIS_IOREQ_LOAD. */
 575     off_t page; /* Swap page where to read/write the object */
 576     off_t pages; /* Swap pages needed to save object. PREPARE_SWAP return val */
 577     int canceled; /* True if this command was canceled by blocking side of VM */
 578     pthread_t thread; /* ID of the thread processing this entry */
 579 } iojob;
 580
 581 /* Structure to hold list iteration abstraction. */
 582 typedef struct {
 583     robj *subject;
 584     unsigned char encoding;
 585     unsigned char direction; /* Iteration direction */
 586     unsigned char *zi;
 587     listNode *ln;
 588 } listTypeIterator;
 589
 590 /* Structure for an entry while iterating over a list. */
 591 typedef struct {
 592     listTypeIterator *li;
 593     unsigned char *zi;  /* Entry in ziplist */
 594     listNode *ln;       /* Entry in linked list */
 595 } listTypeEntry;
 596
 597 /* Structure to hold set iteration abstraction. */
 598 typedef struct {
 599     robj *subject;
 600     int encoding;
 601     int ii; /* intset iterator */
 602     dictIterator *di;
 603 } setTypeIterator;
 604
 605 /* Structure to hold hash iteration abstration. Note that iteration over
 606  * hashes involves both fields and values. Because it is possible that
 607  * not both are required, store pointers in the iterator to avoid
 608  * unnecessary memory allocation for fields/values. */
 609 typedef struct {
 610     int encoding;
 611     unsigned char *zi;
 612     unsigned char *zk, *zv;
 613     unsigned int zklen, zvlen;
 614
 615     dictIterator *di;
 616     dictEntry *de;
 617 } hashTypeIterator;
 618
 619 #define REDIS_HASH_KEY 1
 620 #define REDIS_HASH_VALUE 2
 621
 622 /*-----------------------------------------------------------------------------
 623  * Extern declarations
 624  *----------------------------------------------------------------------------*/
 625
 626 extern struct redisServer server;
 627 extern struct sharedObjectsStruct shared;
 628 extern dictType setDictType;
 629 extern dictType zsetDictType;
 630 extern double R_Zero, R_PosInf, R_NegInf, R_Nan;
 631 dictType hashDictType;
 632
 633 /*-----------------------------------------------------------------------------
 634  * Functions prototypes
 635  *----------------------------------------------------------------------------*/
 636
 637 /* networking.c -- Networking and Client related operations */
 638 redisClient *createClient(int fd);
 639 void closeTimedoutClients(void);
 640 void freeClient(redisClient *c);
 641 void resetClient(redisClient *c);
 642 void sendReplyToClient(aeEventLoop *el, int fd, void *privdata, int mask);
 643 void sendReplyToClientWritev(aeEventLoop *el, int fd, void *privdata, int mask);
 644 void addReply(redisClient *c, robj *obj);
 645 void *addDeferredMultiBulkLength(redisClient *c);
 646 void setDeferredMultiBulkLength(redisClient *c, void *node, long length);
 647 void addReplySds(redisClient *c, sds s);
 648 void processInputBuffer(redisClient *c);
 649 void acceptTcpHandler(aeEventLoop *el, int fd, void *privdata, int mask);
 650 void acceptUnixHandler(aeEventLoop *el, int fd, void *privdata, int mask);
 651 void readQueryFromClient(aeEventLoop *el, int fd, void *privdata, int mask);
 652 void addReplyBulk(redisClient *c, robj *obj);
 653 void addReplyBulkCString(redisClient *c, char *s);
 654 void addReplyBulkCBuffer(redisClient *c, void *p, size_t len);
 655 void addReplyBulkLongLong(redisClient *c, long long ll);
 656 void acceptHandler(aeEventLoop *el, int fd, void *privdata, int mask);
 657 void addReply(redisClient *c, robj *obj);
 658 void addReplySds(redisClient *c, sds s);
 659 void addReplyError(redisClient *c, char *err);
 660 void addReplyStatus(redisClient *c, char *status);
 661 void addReplyDouble(redisClient *c, double d);
 662 void addReplyLongLong(redisClient *c, long long ll);
 663 void addReplyMultiBulkLen(redisClient *c, long length);
 664 void *dupClientReplyValue(void *o);
 665
 666 #ifdef __GNUC__
 667 void addReplyErrorFormat(redisClient *c, const char *fmt, ...)
 668     __attribute__((format(printf, 2, 3)));
 669 void addReplyStatusFormat(redisClient *c, const char *fmt, ...)
 670     __attribute__((format(printf, 2, 3)));
 671 #else
 672 void addReplyErrorFormat(redisClient *c, const char *fmt, ...);
 673 void addReplyStatusFormat(redisClient *c, const char *fmt, ...);
 674 #endif
 675
 676 /* List data type */
 677 void listTypeTryConversion(robj *subject, robj *value);
 678 void listTypePush(robj *subject, robj *value, int where);
 679 robj *listTypePop(robj *subject, int where);
 680 unsigned long listTypeLength(robj *subject);
 681 listTypeIterator *listTypeInitIterator(robj *subject, int index, unsigned char direction);
 682 void listTypeReleaseIterator(listTypeIterator *li);
 683 int listTypeNext(listTypeIterator *li, listTypeEntry *entry);
 684 robj *listTypeGet(listTypeEntry *entry);
 685 void listTypeInsert(listTypeEntry *entry, robj *value, int where);
 686 int listTypeEqual(listTypeEntry *entry, robj *o);
 687 void listTypeDelete(listTypeEntry *entry);
 688 void listTypeConvert(robj *subject, int enc);
 689 void unblockClientWaitingData(redisClient *c);
 690 int handleClientsWaitingListPush(redisClient *c, robj *key, robj *ele);
 691 void popGenericCommand(redisClient *c, int where);
 692
 693 /* MULTI/EXEC/WATCH... */
 694 void unwatchAllKeys(redisClient *c);
 695 void initClientMultiState(redisClient *c);
 696 void freeClientMultiState(redisClient *c);
 697 void queueMultiCommand(redisClient *c, struct redisCommand *cmd);
 698 void touchWatchedKey(redisDb *db, robj *key);
 699 void touchWatchedKeysOnFlush(int dbid);
 700
 701 /* Redis object implementation */
 702 void decrRefCount(void *o);
 703 void incrRefCount(robj *o);
 704 void freeStringObject(robj *o);
 705 void freeListObject(robj *o);
 706 void freeSetObject(robj *o);
 707 void freeZsetObject(robj *o);
 708 void freeHashObject(robj *o);
 709 robj *createObject(int type, void *ptr);
 710 robj *createStringObject(char *ptr, size_t len);
 711 robj *dupStringObject(robj *o);
 712 robj *tryObjectEncoding(robj *o);
 713 robj *getDecodedObject(robj *o);
 714 size_t stringObjectLen(robj *o);
 715 robj *createStringObjectFromLongLong(long long value);
 716 robj *createListObject(void);
 717 robj *createZiplistObject(void);
 718 robj *createSetObject(void);
 719 robj *createIntsetObject(void);
 720 robj *createHashObject(void);
 721 robj *createZsetObject(void);
 722 int getLongFromObjectOrReply(redisClient *c, robj *o, long *target, const char *msg);
 723 int checkType(redisClient *c, robj *o, int type);
 724 int getLongLongFromObjectOrReply(redisClient *c, robj *o, long long *target, const char *msg);
 725 int getDoubleFromObjectOrReply(redisClient *c, robj *o, double *target, const char *msg);
 726 int getLongLongFromObject(robj *o, long long *target);
 727 char *strEncoding(int encoding);
 728 int compareStringObjects(robj *a, robj *b);
 729 int equalStringObjects(robj *a, robj *b);
 730 unsigned long estimateObjectIdleTime(robj *o);
 731
 732 /* Synchronous I/O with timeout */
 733 int syncWrite(int fd, char *ptr, ssize_t size, int timeout);
 734 int syncRead(int fd, char *ptr, ssize_t size, int timeout);
 735 int syncReadLine(int fd, char *ptr, ssize_t size, int timeout);
 736 int fwriteBulkString(FILE *fp, char *s, unsigned long len);
 737 int fwriteBulkDouble(FILE *fp, double d);
 738 int fwriteBulkLongLong(FILE *fp, long long l);
 739 int fwriteBulkObject(FILE *fp, robj *obj);
 740
 741 /* Replication */
 742 void replicationFeedSlaves(list *slaves, int dictid, robj **argv, int argc);
 743 void replicationFeedMonitors(list *monitors, int dictid, robj **argv, int argc);
 744 int syncWithMaster(void);
 745 void updateSlavesWaitingBgsave(int bgsaveerr);
 746 void replicationCron(void);
 747
 748 /* Generic persistence functions */
 749 void startLoading(FILE *fp);
 750 void loadingProgress(off_t pos);
 751 void stopLoading(void);
 752
 753 /* RDB persistence */
 754 int rdbLoad(char *filename);
 755 int rdbSaveBackground(char *filename);
 756 void rdbRemoveTempFile(pid_t childpid);
 757 int rdbSave(char *filename);
 758 int rdbSaveObject(FILE *fp, robj *o);
 759 off_t rdbSavedObjectLen(robj *o);
 760 off_t rdbSavedObjectPages(robj *o);
 761 robj *rdbLoadObject(int type, FILE *fp);
 762 void backgroundSaveDoneHandler(int statloc);
 763
 764 /* AOF persistence */
 765 void flushAppendOnlyFile(void);
 766 void feedAppendOnlyFile(struct redisCommand *cmd, int dictid, robj **argv, int argc);
 767 void aofRemoveTempFile(pid_t childpid);
 768 int rewriteAppendOnlyFileBackground(void);
 769 int loadAppendOnlyFile(char *filename);
 770 void stopAppendOnly(void);
 771 int startAppendOnly(void);
 772 void backgroundRewriteDoneHandler(int statloc);
 773
 774 /* Sorted sets data type */
 775 zskiplist *zslCreate(void);
 776 void zslFree(zskiplist *zsl);
 777 zskiplistNode *zslInsert(zskiplist *zsl, double score, robj *obj);
 778
 779 /* Core functions */
 780 void freeMemoryIfNeeded(void);
 781 int processCommand(redisClient *c);
 782 void setupSigSegvAction(void);
 783 struct redisCommand *lookupCommand(sds name);
 784 struct redisCommand *lookupCommandByCString(char *s);
 785 void call(redisClient *c, struct redisCommand *cmd);
 786 int prepareForShutdown();
 787 void redisLog(int level, const char *fmt, ...);
 788 void usage();
 789 void updateDictResizePolicy(void);
 790 int htNeedsResize(dict *dict);
 791 void oom(const char *msg);
 792 void populateCommandTable(void);
 793
 794 /* Virtual Memory */
 795 void vmInit(void);
 796 void vmMarkPagesFree(off_t page, off_t count);
 797 robj *vmLoadObject(robj *o);
 798 robj *vmPreviewObject(robj *o);
 799 int vmSwapOneObjectBlocking(void);
 800 int vmSwapOneObjectThreaded(void);
 801 int vmCanSwapOut(void);
 802 void vmThreadedIOCompletedJob(aeEventLoop *el, int fd, void *privdata, int mask);
 803 void vmCancelThreadedIOJob(robj *o);
 804 void lockThreadedIO(void);
 805 void unlockThreadedIO(void);
 806 int vmSwapObjectThreaded(robj *key, robj *val, redisDb *db);
 807 void freeIOJob(iojob *j);
 808 void queueIOJob(iojob *j);
 809 int vmWriteObjectOnSwap(robj *o, off_t page);
 810 robj *vmReadObjectFromSwap(off_t page, int type);
 811 void waitEmptyIOJobsQueue(void);
 812 void vmReopenSwapFile(void);
 813 int vmFreePage(off_t page);
 814 void zunionInterBlockClientOnSwappedKeys(redisClient *c, struct redisCommand *cmd, int argc, robj **argv);
 815 void execBlockClientOnSwappedKeys(redisClient *c, struct redisCommand *cmd, int argc, robj **argv);
 816 int blockClientOnSwappedKeys(redisClient *c, struct redisCommand *cmd);
 817 int dontWaitForSwappedKey(redisClient *c, robj *key);
 818 void handleClientsBlockedOnSwappedKey(redisDb *db, robj *key);
 819 vmpointer *vmSwapObjectBlocking(robj *val);
 820
 821 /* Set data type */
 822 robj *setTypeCreate(robj *value);
 823 int setTypeAdd(robj *subject, robj *value);
 824 int setTypeRemove(robj *subject, robj *value);
 825 int setTypeIsMember(robj *subject, robj *value);
 826 setTypeIterator *setTypeInitIterator(robj *subject);
 827 void setTypeReleaseIterator(setTypeIterator *si);
 828 int setTypeNext(setTypeIterator *si, robj **objele, int64_t *llele);
 829 robj *setTypeNextObject(setTypeIterator *si);
 830 int setTypeRandomElement(robj *setobj, robj **objele, int64_t *llele);
 831 unsigned long setTypeSize(robj *subject);
 832 void setTypeConvert(robj *subject, int enc);
 833
 834 /* Hash data type */
 835 void convertToRealHash(robj *o);
 836 void hashTypeTryConversion(robj *subject, robj **argv, int start, int end);
 837 void hashTypeTryObjectEncoding(robj *subject, robj **o1, robj **o2);
 838 int hashTypeGet(robj *o, robj *key, robj **objval, unsigned char **v, unsigned int *vlen);
 839 robj *hashTypeGetObject(robj *o, robj *key);
 840 int hashTypeExists(robj *o, robj *key);
 841 int hashTypeSet(robj *o, robj *key, robj *value);
 842 int hashTypeDelete(robj *o, robj *key);
 843 unsigned long hashTypeLength(robj *o);
 844 hashTypeIterator *hashTypeInitIterator(robj *subject);
 845 void hashTypeReleaseIterator(hashTypeIterator *hi);
 846 int hashTypeNext(hashTypeIterator *hi);
 847 int hashTypeCurrent(hashTypeIterator *hi, int what, robj **objval, unsigned char **v, unsigned int *vlen);
 848 robj *hashTypeCurrentObject(hashTypeIterator *hi, int what);
 849 robj *hashTypeLookupWriteOrCreate(redisClient *c, robj *key);
 850
 851 /* Pub / Sub */
 852 int pubsubUnsubscribeAllChannels(redisClient *c, int notify);
 853 int pubsubUnsubscribeAllPatterns(redisClient *c, int notify);
 854 void freePubsubPattern(void *p);
 855 int listMatchPubsubPattern(void *a, void *b);
 856
 857 /* Utility functions */
 858 int stringmatchlen(const char *pattern, int patternLen,
 859         const char *string, int stringLen, int nocase);
 860 int stringmatch(const char *pattern, const char *string, int nocase);
 861 long long memtoll(const char *p, int *err);
 862 int ll2string(char *s, size_t len, long long value);
 863 int isStringRepresentableAsLong(sds s, long *longval);
 864 int isStringRepresentableAsLongLong(sds s, long long *longval);
 865 int isObjectRepresentableAsLongLong(robj *o, long long *llongval);
 866
 867 /* Configuration */
 868 void loadServerConfig(char *filename);
 869 void appendServerSaveParams(time_t seconds, int changes);
 870 void resetServerSaveParams();
 871
 872 /* db.c -- Keyspace access API */
 873 int removeExpire(redisDb *db, robj *key);
 874 void propagateExpire(redisDb *db, robj *key);
 875 int expireIfNeeded(redisDb *db, robj *key);
 876 time_t getExpire(redisDb *db, robj *key);
 877 void setExpire(redisDb *db, robj *key, time_t when);
 878 robj *lookupKey(redisDb *db, robj *key);
 879 robj *lookupKeyRead(redisDb *db, robj *key);
 880 robj *lookupKeyWrite(redisDb *db, robj *key);
 881 robj *lookupKeyReadOrReply(redisClient *c, robj *key, robj *reply);
 882 robj *lookupKeyWriteOrReply(redisClient *c, robj *key, robj *reply);
 883 int dbAdd(redisDb *db, robj *key, robj *val);
 884 int dbReplace(redisDb *db, robj *key, robj *val);
 885 int dbExists(redisDb *db, robj *key);
 886 robj *dbRandomKey(redisDb *db);
 887 int dbDelete(redisDb *db, robj *key);
 888 long long emptyDb();
 889 int selectDb(redisClient *c, int id);
 890
 891 /* Git SHA1 */
 892 char *redisGitSHA1(void);
 893 char *redisGitDirty(void);
 894
 895 /* Commands prototypes */
 896 void authCommand(redisClient *c);
 897 void pingCommand(redisClient *c);
 898 void echoCommand(redisClient *c);
 899 void setCommand(redisClient *c);
 900 void setnxCommand(redisClient *c);
 901 void setexCommand(redisClient *c);
 902 void getCommand(redisClient *c);
 903 void delCommand(redisClient *c);
 904 void existsCommand(redisClient *c);
 905 void setbitCommand(redisClient *c);
 906 void getbitCommand(redisClient *c);
 907 void setrangeCommand(redisClient *c);
 908 void getrangeCommand(redisClient *c);
 909 void incrCommand(redisClient *c);
 910 void decrCommand(redisClient *c);
 911 void incrbyCommand(redisClient *c);
 912 void decrbyCommand(redisClient *c);
 913 void selectCommand(redisClient *c);
 914 void randomkeyCommand(redisClient *c);
 915 void keysCommand(redisClient *c);
 916 void dbsizeCommand(redisClient *c);
 917 void lastsaveCommand(redisClient *c);
 918 void saveCommand(redisClient *c);
 919 void bgsaveCommand(redisClient *c);
 920 void bgrewriteaofCommand(redisClient *c);
 921 void shutdownCommand(redisClient *c);
 922 void moveCommand(redisClient *c);
 923 void renameCommand(redisClient *c);
 924 void renamenxCommand(redisClient *c);
 925 void lpushCommand(redisClient *c);
 926 void rpushCommand(redisClient *c);
 927 void lpushxCommand(redisClient *c);
 928 void rpushxCommand(redisClient *c);
 929 void linsertCommand(redisClient *c);
 930 void lpopCommand(redisClient *c);
 931 void rpopCommand(redisClient *c);
 932 void llenCommand(redisClient *c);
 933 void lindexCommand(redisClient *c);
 934 void lrangeCommand(redisClient *c);
 935 void ltrimCommand(redisClient *c);
 936 void typeCommand(redisClient *c);
 937 void lsetCommand(redisClient *c);
 938 void saddCommand(redisClient *c);
 939 void sremCommand(redisClient *c);
 940 void smoveCommand(redisClient *c);
 941 void sismemberCommand(redisClient *c);
 942 void scardCommand(redisClient *c);
 943 void spopCommand(redisClient *c);
 944 void srandmemberCommand(redisClient *c);
 945 void sinterCommand(redisClient *c);
 946 void sinterstoreCommand(redisClient *c);
 947 void sunionCommand(redisClient *c);
 948 void sunionstoreCommand(redisClient *c);
 949 void sdiffCommand(redisClient *c);
 950 void sdiffstoreCommand(redisClient *c);
 951 void syncCommand(redisClient *c);
 952 void flushdbCommand(redisClient *c);
 953 void flushallCommand(redisClient *c);
 954 void sortCommand(redisClient *c);
 955 void lremCommand(redisClient *c);
 956 void rpoplpushCommand(redisClient *c);
 957 void infoCommand(redisClient *c);
 958 void mgetCommand(redisClient *c);
 959 void monitorCommand(redisClient *c);
 960 void expireCommand(redisClient *c);
 961 void expireatCommand(redisClient *c);
 962 void getsetCommand(redisClient *c);
 963 void ttlCommand(redisClient *c);
 964 void persistCommand(redisClient *c);
 965 void slaveofCommand(redisClient *c);
 966 void debugCommand(redisClient *c);
 967 void msetCommand(redisClient *c);
 968 void msetnxCommand(redisClient *c);
 969 void zaddCommand(redisClient *c);
 970 void zincrbyCommand(redisClient *c);
 971 void zrangeCommand(redisClient *c);
 972 void zrangebyscoreCommand(redisClient *c);
 973 void zrevrangebyscoreCommand(redisClient *c);
 974 void zcountCommand(redisClient *c);
 975 void zrevrangeCommand(redisClient *c);
 976 void zcardCommand(redisClient *c);
 977 void zremCommand(redisClient *c);
 978 void zscoreCommand(redisClient *c);
 979 void zremrangebyscoreCommand(redisClient *c);
 980 void multiCommand(redisClient *c);
 981 void execCommand(redisClient *c);
 982 void discardCommand(redisClient *c);
 983 void blpopCommand(redisClient *c);
 984 void brpopCommand(redisClient *c);
 985 void brpoplpushCommand(redisClient *c);
 986 void appendCommand(redisClient *c);
 987 void strlenCommand(redisClient *c);
 988 void zrankCommand(redisClient *c);
 989 void zrevrankCommand(redisClient *c);
 990 void hsetCommand(redisClient *c);
 991 void hsetnxCommand(redisClient *c);
 992 void hgetCommand(redisClient *c);
 993 void hmsetCommand(redisClient *c);
 994 void hmgetCommand(redisClient *c);
 995 void hdelCommand(redisClient *c);
 996 void hlenCommand(redisClient *c);
 997 void zremrangebyrankCommand(redisClient *c);
 998 void zunionstoreCommand(redisClient *c);
 999 void zinterstoreCommand(redisClient *c);
1000 void hkeysCommand(redisClient *c);
1001 void hvalsCommand(redisClient *c);
1002 void hgetallCommand(redisClient *c);
1003 void hexistsCommand(redisClient *c);
1004 void configCommand(redisClient *c);
1005 void hincrbyCommand(redisClient *c);
1006 void subscribeCommand(redisClient *c);
1007 void unsubscribeCommand(redisClient *c);
1008 void psubscribeCommand(redisClient *c);
1009 void punsubscribeCommand(redisClient *c);
1010 void publishCommand(redisClient *c);
1011 void watchCommand(redisClient *c);
1012 void unwatchCommand(redisClient *c);
1013
1014 #if defined(__GNUC__)
1015 void *calloc(size_t count, size_t size) __attribute__ ((deprecated));
1016 void free(void *ptr) __attribute__ ((deprecated));
1017 void *malloc(size_t size) __attribute__ ((deprecated));
1018 void *realloc(void *ptr, size_t size) __attribute__ ((deprecated));
1019 #endif
1020
1021 #endif