X-Git-Url: https://git.saurik.com/redis.git/blobdiff_plain/a0f643ea4c574d7f393a325f8f6e7c6c2e1c476f..638e42aca477816ab4754ffb4e1e2816bdcc163c:/redis.c

diff --git a/redis.c b/redis.c
index 2d8b5d3e..74986528 100644
--- a/redis.c
+++ b/redis.c
@@ -27,16 +27,24 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 
-#define REDIS_VERSION "0.100"
+#define REDIS_VERSION "1.001"
 
 #include "fmacros.h"
+#include "config.h"
 
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <time.h>
 #include <unistd.h>
+#define __USE_POSIX199309
 #include <signal.h>
+
+#ifdef HAVE_BACKTRACE
+#include <execinfo.h>
+#include <ucontext.h>
+#endif /* HAVE_BACKTRACE */
+
 #include <sys/wait.h>
 #include <errno.h>
 #include <assert.h>
@@ -50,6 +58,7 @@
 #include <sys/resource.h>
 #include <limits.h>
 
+#include "redis.h"
 #include "ae.h"     /* Event driven programming library */
 #include "sds.h"    /* Dynamic safe strings */
 #include "anet.h"   /* Networking the easy way */
@@ -74,14 +83,20 @@
 #define REDIS_OBJFREELIST_MAX   1000000 /* Max number of objects to cache */
 #define REDIS_MAX_SYNC_TIME     60      /* Slave can't take more to sync */
 #define REDIS_EXPIRELOOKUPS_PER_CRON    100 /* try to expire 100 keys/second */
+#define REDIS_MAX_WRITE_PER_EVENT (1024*64)
+#define REDIS_REQUEST_MAX_SIZE  (1024*1024*256) /* max bytes in inline command */
 
 /* Hash table parameters */
 #define REDIS_HT_MINFILL        10      /* Minimal hash table fill 10% */
-#define REDIS_HT_MINSLOTS       16384   /* Never resize the HT under this */
 
 /* Command flags */
-#define REDIS_CMD_BULK          1
-#define REDIS_CMD_INLINE        2
+#define REDIS_CMD_BULK          1       /* Bulk write command */
+#define REDIS_CMD_INLINE        2       /* Inline command */
+/* REDIS_CMD_DENYOOM reserves a longer comment: all the commands marked with
+   this flags will return an error when the 'maxmemory' option is set in the
+   config file and the server is using more than maxmemory bytes of memory.
+   In short this commands are denied on low memory conditions. */
+#define REDIS_CMD_DENYOOM       4
 
 /* Object types */
 #define REDIS_STRING 0
@@ -89,6 +104,10 @@
 #define REDIS_SET 2
 #define REDIS_HASH 3
 
+/* Objects encoding */
+#define REDIS_ENCODING_RAW 0    /* Raw representation */
+#define REDIS_ENCODING_INT 1    /* Encoded as integer */
+
 /* Object types only used for dumping to disk */
 #define REDIS_EXPIRETIME 253
 #define REDIS_SELECTDB 254
@@ -162,12 +181,15 @@
 /* Anti-warning macro... */
 #define REDIS_NOTUSED(V) ((void) V)
 
+
 /*================================= Data types ============================== */
 
 /* A redis object, that is a type able to hold a string / list / set */
 typedef struct redisObject {
     void *ptr;
-    int type;
+    unsigned char type;
+    unsigned char encoding;
+    unsigned char notused[2];
     int refcount;
 } robj;
 
@@ -184,9 +206,10 @@ typedef struct redisClient {
     redisDb *db;
     int dictid;
     sds querybuf;
-    robj **argv;
-    int argc;
+    robj **argv, **mbargv;
+    int argc, mbargc;
     int bulklen;            /* bulk read len. -1 if not in bulk read mode */
+    int multibulk;          /* multi bulk command format active */
     list *reply;
     int sentlen;
     time_t lastinteraction; /* time of the last interaction, used for timeout */
@@ -232,6 +255,7 @@ struct redisServer {
     int daemonize;
     char *pidfile;
     int bgsaveinprogress;
+    pid_t bgsavechildpid;
     struct saveparam *saveparams;
     int saveparamslen;
     char *logfile;
@@ -245,6 +269,8 @@ struct redisServer {
     int masterport;
     redisClient *master;    /* client that is master for this slave */
     int replstate;
+    unsigned int maxclients;
+    unsigned long maxmemory;
     /* Sort parameters - qsort_r() is only available under BSD so we
      * have to take this state global, in order to pass it to sortCompare() */
     int sort_desc;
@@ -260,6 +286,11 @@ struct redisCommand {
     int flags;
 };
 
+struct redisFunctionSym {
+    char *name;
+    unsigned long pointer;
+};
+
 typedef struct _redisSortObject {
     robj *obj;
     union {
@@ -299,13 +330,21 @@ static robj *createStringObject(char *ptr, size_t len);
 static void replicationFeedSlaves(list *slaves, struct redisCommand *cmd, int dictid, robj **argv, int argc);
 static int syncWithMaster(void);
 static robj *tryObjectSharing(robj *o);
+static int tryObjectEncoding(robj *o);
+static robj *getDecodedObject(const robj *o);
 static int removeExpire(redisDb *db, robj *key);
 static int expireIfNeeded(redisDb *db, robj *key);
 static int deleteIfVolatile(redisDb *db, robj *key);
 static int deleteKey(redisDb *db, robj *key);
 static time_t getExpire(redisDb *db, robj *key);
 static int setExpire(redisDb *db, robj *key, time_t when);
-static void updateSalvesWaitingBgsave(int bgsaveerr);
+static void updateSlavesWaitingBgsave(int bgsaveerr);
+static void freeMemoryIfNeeded(void);
+static int processCommand(redisClient *c);
+static void setupSigSegvAction(void);
+static void rdbRemoveTempFile(pid_t childpid);
+static size_t stringObjectLen(robj *o);
+static void processInputBuffer(redisClient *c);
 
 static void authCommand(redisClient *c);
 static void pingCommand(redisClient *c);
@@ -345,6 +384,7 @@ static void sremCommand(redisClient *c);
 static void smoveCommand(redisClient *c);
 static void sismemberCommand(redisClient *c);
 static void scardCommand(redisClient *c);
+static void spopCommand(redisClient *c);
 static void sinterCommand(redisClient *c);
 static void sinterstoreCommand(redisClient *c);
 static void sunionCommand(redisClient *c);
@@ -360,9 +400,12 @@ static void infoCommand(redisClient *c);
 static void mgetCommand(redisClient *c);
 static void monitorCommand(redisClient *c);
 static void expireCommand(redisClient *c);
-static void getSetCommand(redisClient *c);
+static void getsetCommand(redisClient *c);
 static void ttlCommand(redisClient *c);
 static void slaveofCommand(redisClient *c);
+static void debugCommand(redisClient *c);
+static void msetCommand(redisClient *c);
+static void msetnxCommand(redisClient *c);
 
 /*================================= Globals ================================= */
 
@@ -370,38 +413,41 @@ static void slaveofCommand(redisClient *c);
 static struct redisServer server; /* server global state */
 static struct redisCommand cmdTable[] = {
     {"get",getCommand,2,REDIS_CMD_INLINE},
-    {"set",setCommand,3,REDIS_CMD_BULK},
-    {"setnx",setnxCommand,3,REDIS_CMD_BULK},
+    {"set",setCommand,3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM},
+    {"setnx",setnxCommand,3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM},
     {"del",delCommand,-2,REDIS_CMD_INLINE},
     {"exists",existsCommand,2,REDIS_CMD_INLINE},
-    {"incr",incrCommand,2,REDIS_CMD_INLINE},
-    {"decr",decrCommand,2,REDIS_CMD_INLINE},
+    {"incr",incrCommand,2,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM},
+    {"decr",decrCommand,2,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM},
     {"mget",mgetCommand,-2,REDIS_CMD_INLINE},
-    {"rpush",rpushCommand,3,REDIS_CMD_BULK},
-    {"lpush",lpushCommand,3,REDIS_CMD_BULK},
+    {"rpush",rpushCommand,3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM},
+    {"lpush",lpushCommand,3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM},
     {"rpop",rpopCommand,2,REDIS_CMD_INLINE},
     {"lpop",lpopCommand,2,REDIS_CMD_INLINE},
     {"llen",llenCommand,2,REDIS_CMD_INLINE},
     {"lindex",lindexCommand,3,REDIS_CMD_INLINE},
-    {"lset",lsetCommand,4,REDIS_CMD_BULK},
+    {"lset",lsetCommand,4,REDIS_CMD_BULK|REDIS_CMD_DENYOOM},
     {"lrange",lrangeCommand,4,REDIS_CMD_INLINE},
     {"ltrim",ltrimCommand,4,REDIS_CMD_INLINE},
     {"lrem",lremCommand,4,REDIS_CMD_BULK},
-    {"sadd",saddCommand,3,REDIS_CMD_BULK},
+    {"sadd",saddCommand,3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM},
     {"srem",sremCommand,3,REDIS_CMD_BULK},
     {"smove",smoveCommand,4,REDIS_CMD_BULK},
     {"sismember",sismemberCommand,3,REDIS_CMD_BULK},
     {"scard",scardCommand,2,REDIS_CMD_INLINE},
-    {"sinter",sinterCommand,-2,REDIS_CMD_INLINE},
-    {"sinterstore",sinterstoreCommand,-3,REDIS_CMD_INLINE},
-    {"sunion",sunionCommand,-2,REDIS_CMD_INLINE},
-    {"sunionstore",sunionstoreCommand,-3,REDIS_CMD_INLINE},
-    {"sdiff",sdiffCommand,-2,REDIS_CMD_INLINE},
-    {"sdiffstore",sdiffstoreCommand,-3,REDIS_CMD_INLINE},
+    {"spop",spopCommand,2,REDIS_CMD_INLINE},
+    {"sinter",sinterCommand,-2,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM},
+    {"sinterstore",sinterstoreCommand,-3,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM},
+    {"sunion",sunionCommand,-2,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM},
+    {"sunionstore",sunionstoreCommand,-3,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM},
+    {"sdiff",sdiffCommand,-2,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM},
+    {"sdiffstore",sdiffstoreCommand,-3,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM},
     {"smembers",sinterCommand,2,REDIS_CMD_INLINE},
-    {"incrby",incrbyCommand,3,REDIS_CMD_INLINE},
-    {"decrby",decrbyCommand,3,REDIS_CMD_INLINE},
-    {"getset",getSetCommand,3,REDIS_CMD_BULK},
+    {"incrby",incrbyCommand,3,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM},
+    {"decrby",decrbyCommand,3,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM},
+    {"getset",getsetCommand,3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM},
+    {"mset",msetCommand,-3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM},
+    {"msetnx",msetnxCommand,-3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM},
     {"randomkey",randomkeyCommand,1,REDIS_CMD_INLINE},
     {"select",selectCommand,2,REDIS_CMD_INLINE},
     {"move",moveCommand,3,REDIS_CMD_INLINE},
@@ -421,14 +467,14 @@ static struct redisCommand cmdTable[] = {
     {"sync",syncCommand,1,REDIS_CMD_INLINE},
     {"flushdb",flushdbCommand,1,REDIS_CMD_INLINE},
     {"flushall",flushallCommand,1,REDIS_CMD_INLINE},
-    {"sort",sortCommand,-2,REDIS_CMD_INLINE},
+    {"sort",sortCommand,-2,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM},
     {"info",infoCommand,1,REDIS_CMD_INLINE},
     {"monitor",monitorCommand,1,REDIS_CMD_INLINE},
     {"ttl",ttlCommand,2,REDIS_CMD_INLINE},
     {"slaveof",slaveofCommand,3,REDIS_CMD_INLINE},
+    {"debug",debugCommand,-2,REDIS_CMD_INLINE},
     {NULL,NULL,0,0}
 };
-
 /*============================ Utility functions ============================ */
 
 /* Glob-style pattern matching. */
@@ -554,8 +600,7 @@ int stringmatchlen(const char *pattern, int patternLen,
     return 0;
 }
 
-void redisLog(int level, const char *fmt, ...)
-{
+static void redisLog(int level, const char *fmt, ...) {
     va_list ap;
     FILE *fp;
 
@@ -605,32 +650,68 @@ static void dictRedisObjectDestructor(void *privdata, void *val)
     decrRefCount(val);
 }
 
-static int dictSdsKeyCompare(void *privdata, const void *key1,
+static int dictObjKeyCompare(void *privdata, const void *key1,
         const void *key2)
 {
     const robj *o1 = key1, *o2 = key2;
     return sdsDictKeyCompare(privdata,o1->ptr,o2->ptr);
 }
 
-static unsigned int dictSdsHash(const void *key) {
+static unsigned int dictObjHash(const void *key) {
     const robj *o = key;
     return dictGenHashFunction(o->ptr, sdslen((sds)o->ptr));
 }
 
+static int dictEncObjKeyCompare(void *privdata, const void *key1,
+        const void *key2)
+{
+    const robj *o1 = key1, *o2 = key2;
+
+    if (o1->encoding == REDIS_ENCODING_RAW &&
+        o2->encoding == REDIS_ENCODING_RAW)
+        return sdsDictKeyCompare(privdata,o1->ptr,o2->ptr);
+    else {
+        robj *dec1, *dec2;
+        int cmp;
+
+        dec1 = o1->encoding != REDIS_ENCODING_RAW ?
+            getDecodedObject(o1) : (robj*)o1;
+        dec2 = o2->encoding != REDIS_ENCODING_RAW ?
+            getDecodedObject(o2) : (robj*)o2;
+        cmp = sdsDictKeyCompare(privdata,dec1->ptr,dec2->ptr);
+        if (dec1 != o1) decrRefCount(dec1);
+        if (dec2 != o2) decrRefCount(dec2);
+        return cmp;
+    }
+}
+
+static unsigned int dictEncObjHash(const void *key) {
+    const robj *o = key;
+
+    if (o->encoding == REDIS_ENCODING_RAW)
+        return dictGenHashFunction(o->ptr, sdslen((sds)o->ptr));
+    else {
+        robj *dec = getDecodedObject(o);
+        unsigned int hash = dictGenHashFunction(dec->ptr, sdslen((sds)dec->ptr));
+        decrRefCount(dec);
+        return hash;
+    }
+}
+
 static dictType setDictType = {
-    dictSdsHash,               /* hash function */
+    dictEncObjHash,            /* hash function */
     NULL,                      /* key dup */
     NULL,                      /* val dup */
-    dictSdsKeyCompare,         /* key compare */
+    dictEncObjKeyCompare,      /* key compare */
     dictRedisObjectDestructor, /* key destructor */
     NULL                       /* val destructor */
 };
 
 static dictType hashDictType = {
-    dictSdsHash,                /* hash function */
+    dictObjHash,                /* hash function */
     NULL,                       /* key dup */
     NULL,                       /* val dup */
-    dictSdsKeyCompare,          /* key compare */
+    dictObjKeyCompare,          /* key compare */
     dictRedisObjectDestructor,  /* key destructor */
     dictRedisObjectDestructor   /* val destructor */
 };
@@ -650,7 +731,7 @@ static void oom(const char *msg) {
 }
 
 /* ====================== Redis server networking stuff ===================== */
-void closeTimedoutClients(void) {
+static void closeTimedoutClients(void) {
     redisClient *c;
     listNode *ln;
     time_t now = time(NULL);
@@ -667,26 +748,32 @@ void closeTimedoutClients(void) {
     }
 }
 
+static int htNeedsResize(dict *dict) {
+    long long size, used;
+
+    size = dictSlots(dict);
+    used = dictSize(dict);
+    return (size && used && size > DICT_HT_INITIAL_SIZE &&
+            (used*100/size < REDIS_HT_MINFILL));
+}
+
 /* If the percentage of used slots in the HT reaches REDIS_HT_MINFILL
  * we resize the hash table to save memory */
-void tryResizeHashTables(void) {
+static void tryResizeHashTables(void) {
     int j;
 
     for (j = 0; j < server.dbnum; j++) {
-        long long size, used;
-
-        size = dictSlots(server.db[j].dict);
-        used = dictSize(server.db[j].dict);
-        if (size && used && size > REDIS_HT_MINSLOTS &&
-            (used*100/size < REDIS_HT_MINFILL)) {
-            redisLog(REDIS_NOTICE,"The hash table %d is too sparse, resize it...",j);
+        if (htNeedsResize(server.db[j].dict)) {
+            redisLog(REDIS_DEBUG,"The hash table %d is too sparse, resize it...",j);
             dictResize(server.db[j].dict);
-            redisLog(REDIS_NOTICE,"Hash table %d resized.",j);
+            redisLog(REDIS_DEBUG,"Hash table %d resized.",j);
         }
+        if (htNeedsResize(server.db[j].expires))
+            dictResize(server.db[j].expires);
     }
 }
 
-int serverCron(struct aeEventLoop *eventLoop, long long id, void *clientData) {
+static int serverCron(struct aeEventLoop *eventLoop, long long id, void *clientData) {
     int j, loops = server.cronloops++;
     REDIS_NOTUSED(eventLoop);
     REDIS_NOTUSED(id);
@@ -702,8 +789,8 @@ int serverCron(struct aeEventLoop *eventLoop, long long id, void *clientData) {
         size = dictSlots(server.db[j].dict);
         used = dictSize(server.db[j].dict);
         vkeys = dictSize(server.db[j].expires);
-        if (!(loops % 5) && used > 0) {
-            redisLog(REDIS_DEBUG,"DB %d: %d keys (%d volatile) in %d slots HT.",j,used,vkeys,size);
+        if (!(loops % 5) && (used || vkeys)) {
+            redisLog(REDIS_DEBUG,"DB %d: %lld keys (%lld volatile) in %lld slots HT.",j,used,vkeys,size);
             /* dictPrintStats(server.dict); */
         }
     }
@@ -718,7 +805,7 @@ int serverCron(struct aeEventLoop *eventLoop, long long id, void *clientData) {
 
     /* Show information about connected clients */
     if (!(loops % 5)) {
-        redisLog(REDIS_DEBUG,"%d clients connected (%d slaves), %zu bytes in use",
+        redisLog(REDIS_DEBUG,"%d clients connected (%d slaves), %zu bytes in use, %d shared objects",
             listLength(server.clients)-listLength(server.slaves),
             listLength(server.slaves),
             server.usedmemory,
@@ -732,20 +819,25 @@ int serverCron(struct aeEventLoop *eventLoop, long long id, void *clientData) {
     /* Check if a background saving in progress terminated */
     if (server.bgsaveinprogress) {
         int statloc;
-        /* XXX: TODO handle the case of the saving child killed */
         if (wait4(-1,&statloc,WNOHANG,NULL)) {
             int exitcode = WEXITSTATUS(statloc);
-            if (exitcode == 0) {
+            int bysignal = WIFSIGNALED(statloc);
+
+            if (!bysignal && exitcode == 0) {
                 redisLog(REDIS_NOTICE,
                     "Background saving terminated with success");
                 server.dirty = 0;
                 server.lastsave = time(NULL);
+            } else if (!bysignal && exitcode != 0) {
+                redisLog(REDIS_WARNING, "Background saving error");
             } else {
                 redisLog(REDIS_WARNING,
-                    "Background saving error");
+                    "Background saving terminated by signal");
+                rdbRemoveTempFile(server.bgsavechildpid);
             }
             server.bgsaveinprogress = 0;
-            updateSalvesWaitingBgsave(exitcode == 0 ? REDIS_OK : REDIS_ERR);
+            server.bgsavechildpid = -1;
+            updateSlavesWaitingBgsave(exitcode == 0 ? REDIS_OK : REDIS_ERR);
         }
     } else {
         /* If there is not a background saving in progress check if
@@ -862,6 +954,9 @@ static void initServerConfig() {
     server.dbfilename = "dump.rdb";
     server.requirepass = NULL;
     server.shareobjects = 0;
+    server.sharingpoolsize = 1024;
+    server.maxclients = 0;
+    server.maxmemory = 0;
     ResetServerSaveParams();
 
     appendServerSaveParams(60*60,1);  /* save after 1 hour and 1 change */
@@ -880,6 +975,7 @@ static void initServer() {
 
     signal(SIGHUP, SIG_IGN);
     signal(SIGPIPE, SIG_IGN);
+    setupSigSegvAction();
 
     server.clients = listCreate();
     server.slaves = listCreate();
@@ -889,7 +985,6 @@ static void initServer() {
     server.el = aeCreateEventLoop();
     server.db = zmalloc(sizeof(redisDb)*server.dbnum);
     server.sharingpool = dictCreate(&setDictType,NULL);
-    server.sharingpoolsize = 1024;
     if (!server.db || !server.clients || !server.slaves || !server.monitors || !server.el || !server.objfreelist)
         oom("server initialization"); /* Fatal OOM */
     server.fd = anetTcpServer(server.neterr, server.port, server.bindaddr);
@@ -904,6 +999,7 @@ static void initServer() {
     }
     server.cronloops = 0;
     server.bgsaveinprogress = 0;
+    server.bgsavechildpid = -1;
     server.lastsave = time(NULL);
     server.dirty = 0;
     server.usedmemory = 0;
@@ -935,15 +1031,20 @@ static int yesnotoi(char *s) {
 /* I agree, this is a very rudimental way to load a configuration...
    will improve later if the config gets more complex */
 static void loadServerConfig(char *filename) {
-    FILE *fp = fopen(filename,"r");
+    FILE *fp;
     char buf[REDIS_CONFIGLINE_MAX+1], *err = NULL;
     int linenum = 0;
     sds line = NULL;
-    
-    if (!fp) {
-        redisLog(REDIS_WARNING,"Fatal error, can't open config file");
-        exit(1);
+
+    if (filename[0] == '-' && filename[1] == '\0')
+        fp = stdin;
+    else {
+        if ((fp = fopen(filename,"r")) == NULL) {
+            redisLog(REDIS_WARNING,"Fatal error, can't open config file");
+            exit(1);
+        }
     }
+
     while(fgets(buf,REDIS_CONFIGLINE_MAX+1,fp) != NULL) {
         sds *argv;
         int argc, j;
@@ -997,7 +1098,7 @@ static void loadServerConfig(char *filename) {
                 goto loaderr;
             }
         } else if (!strcasecmp(argv[0],"logfile") && argc == 2) {
-            FILE *fp;
+            FILE *logfp;
 
             server.logfile = zstrdup(argv[1]);
             if (!strcasecmp(server.logfile,"stdout")) {
@@ -1007,19 +1108,23 @@ static void loadServerConfig(char *filename) {
             if (server.logfile) {
                 /* Test if we are able to open the file. The server will not
                  * be able to abort just for this problem later... */
-                fp = fopen(server.logfile,"a");
-                if (fp == NULL) {
+                logfp = fopen(server.logfile,"a");
+                if (logfp == NULL) {
                     err = sdscatprintf(sdsempty(),
                         "Can't open the log file: %s", strerror(errno));
                     goto loaderr;
                 }
-                fclose(fp);
+                fclose(logfp);
             }
         } else if (!strcasecmp(argv[0],"databases") && argc == 2) {
             server.dbnum = atoi(argv[1]);
             if (server.dbnum < 1) {
                 err = "Invalid number of databases"; goto loaderr;
             }
+        } else if (!strcasecmp(argv[0],"maxclients") && argc == 2) {
+            server.maxclients = atoi(argv[1]);
+        } else if (!strcasecmp(argv[0],"maxmemory") && argc == 2) {
+            server.maxmemory = strtoll(argv[1], NULL, 10);
         } else if (!strcasecmp(argv[0],"slaveof") && argc == 3) {
             server.masterhost = sdsnew(argv[1]);
             server.masterport = atoi(argv[2]);
@@ -1032,6 +1137,11 @@ static void loadServerConfig(char *filename) {
             if ((server.shareobjects = yesnotoi(argv[1])) == -1) {
                 err = "argument must be 'yes' or 'no'"; goto loaderr;
             }
+        } else if (!strcasecmp(argv[0],"shareobjectspoolsize") && argc == 2) {
+            server.sharingpoolsize = atoi(argv[1]);
+            if (server.sharingpoolsize < 1) {
+                err = "invalid object sharing pool size"; goto loaderr;
+            }
         } else if (!strcasecmp(argv[0],"daemonize") && argc == 2) {
             if ((server.daemonize = yesnotoi(argv[1])) == -1) {
                 err = "argument must be 'yes' or 'no'"; goto loaderr;
@@ -1050,7 +1160,7 @@ static void loadServerConfig(char *filename) {
         zfree(argv);
         sdsfree(line);
     }
-    fclose(fp);
+    if (fp != stdin) fclose(fp);
     return;
 
 loaderr:
@@ -1066,7 +1176,10 @@ static void freeClientArgv(redisClient *c) {
 
     for (j = 0; j < c->argc; j++)
         decrRefCount(c->argv[j]);
+    for (j = 0; j < c->mbargc; j++)
+        decrRefCount(c->mbargv[j]);
     c->argc = 0;
+    c->mbargc = 0;
 }
 
 static void freeClient(redisClient *c) {
@@ -1094,6 +1207,7 @@ static void freeClient(redisClient *c) {
         server.replstate = REDIS_REPL_CONNECT;
     }
     zfree(c->argv);
+    zfree(c->mbargv);
     zfree(c);
 }
 
@@ -1146,6 +1260,7 @@ static void sendReplyToClient(aeEventLoop *el, int fd, void *privdata, int mask)
         }
 
         if (c->flags & REDIS_MASTER) {
+            /* Don't reply to a master */
             nwritten = objlen - c->sentlen;
         } else {
             nwritten = write(fd, ((char*)o->ptr)+c->sentlen, objlen - c->sentlen);
@@ -1158,6 +1273,12 @@ static void sendReplyToClient(aeEventLoop *el, int fd, void *privdata, int mask)
             listDelNode(c->reply,listFirst(c->reply));
             c->sentlen = 0;
         }
+        /* Note that we avoid to send more thank REDIS_MAX_WRITE_PER_EVENT
+         * bytes, in a single threaded server it's a good idea to server
+         * other clients as well, even if a very large request comes from
+         * super fast link that is always able to accept data (in real world
+         * terms think to 'KEYS *' against the loopback interfae) */
+        if (totwritten > REDIS_MAX_WRITE_PER_EVENT) break;
     }
     if (nwritten == -1) {
         if (errno == EAGAIN) {
@@ -1189,6 +1310,7 @@ static struct redisCommand *lookupCommand(char *name) {
 static void resetClient(redisClient *c) {
     freeClientArgv(c);
     c->bulklen = -1;
+    c->multibulk = 0;
 }
 
 /* If this function gets called we already read a whole
@@ -1203,6 +1325,85 @@ static int processCommand(redisClient *c) {
     struct redisCommand *cmd;
     long long dirty;
 
+    /* Free some memory if needed (maxmemory setting) */
+    if (server.maxmemory) freeMemoryIfNeeded();
+
+    /* Handle the multi bulk command type. This is an alternative protocol
+     * supported by Redis in order to receive commands that are composed of
+     * multiple binary-safe "bulk" arguments. The latency of processing is
+     * a bit higher but this allows things like multi-sets, so if this
+     * protocol is used only for MSET and similar commands this is a big win. */
+    if (c->multibulk == 0 && c->argc == 1 && ((char*)(c->argv[0]->ptr))[0] == '*') {
+        c->multibulk = atoi(((char*)c->argv[0]->ptr)+1);
+        if (c->multibulk <= 0) {
+            resetClient(c);
+            return 1;
+        } else {
+            decrRefCount(c->argv[c->argc-1]);
+            c->argc--;
+            return 1;
+        }
+    } else if (c->multibulk) {
+        if (c->bulklen == -1) {
+            if (((char*)c->argv[0]->ptr)[0] != '$') {
+                addReplySds(c,sdsnew("-ERR multi bulk protocol error\r\n"));
+                resetClient(c);
+                return 1;
+            } else {
+                int bulklen = atoi(((char*)c->argv[0]->ptr)+1);
+                decrRefCount(c->argv[0]);
+                if (bulklen < 0 || bulklen > 1024*1024*1024) {
+                    c->argc--;
+                    addReplySds(c,sdsnew("-ERR invalid bulk write count\r\n"));
+                    resetClient(c);
+                    return 1;
+                }
+                c->argc--;
+                c->bulklen = bulklen+2; /* add two bytes for CR+LF */
+                /*
+                if (sdslen(c->querybuf) > 0)
+                    processInputBuffer(c);
+                    */
+                return 1;
+            }
+        } else {
+            c->mbargv = zrealloc(c->mbargv,(sizeof(robj*))*(c->mbargc+1));
+            c->mbargv[c->mbargc] = c->argv[0];
+            c->mbargc++;
+            c->argc--;
+            c->multibulk--;
+            if (c->multibulk == 0) {
+                robj **auxargv;
+                int auxargc;
+
+                /* Here we need to swap the multi-bulk argc/argv with the
+                 * normal argc/argv of the client structure. */
+                auxargv = c->argv;
+                c->argv = c->mbargv;
+                c->mbargv = auxargv;
+
+                auxargc = c->argc;
+                c->argc = c->mbargc;
+                c->mbargc = auxargc;
+
+                /* We need to set bulklen to something different than -1
+                 * in order for the code below to process the command without
+                 * to try to read the last argument of a bulk command as
+                 * a special argument. */
+                c->bulklen = 0;
+                /* continue below and process the command */
+            } else {
+                c->bulklen = -1;
+                /*
+                if (sdslen(c->querybuf) > 0)
+                    processInputBuffer(c);
+                    */
+                return 1;
+            }
+        }
+    }
+    /* -- end of multi bulk commands processing -- */
+
     /* The QUIT command is handled as a special case. Normal command
      * procs are unable to close the client connection safely */
     if (!strcasecmp(c->argv[0]->ptr,"quit")) {
@@ -1219,6 +1420,10 @@ static int processCommand(redisClient *c) {
         addReplySds(c,sdsnew("-ERR wrong number of arguments\r\n"));
         resetClient(c);
         return 1;
+    } else if (server.maxmemory && cmd->flags & REDIS_CMD_DENYOOM && zmalloc_used_memory() > server.maxmemory) {
+        addReplySds(c,sdsnew("-ERR command not allowed when used memory > 'maxmemory'\r\n"));
+        resetClient(c);
+        return 1;
     } else if (cmd->flags & REDIS_CMD_BULK && c->bulklen == -1) {
         int bulklen = atoi(c->argv[c->argc-1]->ptr);
 
@@ -1247,6 +1452,10 @@ static int processCommand(redisClient *c) {
         for(j = 1; j < c->argc; j++)
             c->argv[j] = tryObjectSharing(c->argv[j]);
     }
+    /* Let's try to encode the bulk object to save space. */
+    if (cmd->flags & REDIS_CMD_BULK)
+        tryObjectEncoding(c->argv[c->argc-1]);
+
     /* Check if the user is authenticated */
     if (server.requirepass && !c->authenticated && cmd->proc != authCommand) {
         addReplySds(c,sdsnew("-ERR operation not permitted\r\n"));
@@ -1292,7 +1501,8 @@ static void replicationFeedSlaves(list *slaves, struct redisCommand *cmd, int di
             robj *lenobj;
 
             lenobj = createObject(REDIS_STRING,
-                sdscatprintf(sdsempty(),"%d\r\n",sdslen(argv[j]->ptr)));
+                sdscatprintf(sdsempty(),"%d\r\n",
+                    stringObjectLen(argv[j])));
             lenobj->refcount = 0;
             outv[outc++] = lenobj;
         }
@@ -1341,39 +1551,13 @@ static void replicationFeedSlaves(list *slaves, struct redisCommand *cmd, int di
     if (outv != static_outv) zfree(outv);
 }
 
-static void readQueryFromClient(aeEventLoop *el, int fd, void *privdata, int mask) {
-    redisClient *c = (redisClient*) privdata;
-    char buf[REDIS_IOBUF_LEN];
-    int nread;
-    REDIS_NOTUSED(el);
-    REDIS_NOTUSED(mask);
-
-    nread = read(fd, buf, REDIS_IOBUF_LEN);
-    if (nread == -1) {
-        if (errno == EAGAIN) {
-            nread = 0;
-        } else {
-            redisLog(REDIS_DEBUG, "Reading from client: %s",strerror(errno));
-            freeClient(c);
-            return;
-        }
-    } else if (nread == 0) {
-        redisLog(REDIS_DEBUG, "Client closed connection");
-        freeClient(c);
-        return;
-    }
-    if (nread) {
-        c->querybuf = sdscatlen(c->querybuf, buf, nread);
-        c->lastinteraction = time(NULL);
-    } else {
-        return;
-    }
-
+static void processInputBuffer(redisClient *c) {
 again:
     if (c->bulklen == -1) {
         /* Read the first line of the query */
         char *p = strchr(c->querybuf,'\n');
         size_t querylen;
+
         if (p) {
             sds query, *argv;
             int argc, j;
@@ -1415,9 +1599,9 @@ again:
             /* Execute the command. If the client is still valid
              * after processCommand() return and there is something
              * on the query buffer try to process the next command. */
-            if (processCommand(c) && sdslen(c->querybuf)) goto again;
+            if (c->argc && processCommand(c) && sdslen(c->querybuf)) goto again;
             return;
-        } else if (sdslen(c->querybuf) >= 1024) {
+        } else if (sdslen(c->querybuf) >= REDIS_REQUEST_MAX_SIZE) {
             redisLog(REDIS_DEBUG, "Client protocol error");
             freeClient(c);
             return;
@@ -1434,12 +1618,45 @@ again:
             c->argv[c->argc] = createStringObject(c->querybuf,c->bulklen-2);
             c->argc++;
             c->querybuf = sdsrange(c->querybuf,c->bulklen,-1);
-            processCommand(c);
+            /* Process the command. If the client is still valid after
+             * the processing and there is more data in the buffer
+             * try to parse it. */
+            if (processCommand(c) && sdslen(c->querybuf)) goto again;
             return;
         }
     }
 }
 
+static void readQueryFromClient(aeEventLoop *el, int fd, void *privdata, int mask) {
+    redisClient *c = (redisClient*) privdata;
+    char buf[REDIS_IOBUF_LEN];
+    int nread;
+    REDIS_NOTUSED(el);
+    REDIS_NOTUSED(mask);
+
+    nread = read(fd, buf, REDIS_IOBUF_LEN);
+    if (nread == -1) {
+        if (errno == EAGAIN) {
+            nread = 0;
+        } else {
+            redisLog(REDIS_DEBUG, "Reading from client: %s",strerror(errno));
+            freeClient(c);
+            return;
+        }
+    } else if (nread == 0) {
+        redisLog(REDIS_DEBUG, "Client closed connection");
+        freeClient(c);
+        return;
+    }
+    if (nread) {
+        c->querybuf = sdscatlen(c->querybuf, buf, nread);
+        c->lastinteraction = time(NULL);
+    } else {
+        return;
+    }
+    processInputBuffer(c);
+}
+
 static int selectDb(redisClient *c, int id) {
     if (id < 0 || id >= server.dbnum)
         return REDIS_ERR;
@@ -1464,6 +1681,9 @@ static redisClient *createClient(int fd) {
     c->argc = 0;
     c->argv = NULL;
     c->bulklen = -1;
+    c->multibulk = 0;
+    c->mbargc = 0;
+    c->mbargv = NULL;
     c->sentlen = 0;
     c->flags = 0;
     c->lastinteraction = time(NULL);
@@ -1487,8 +1707,12 @@ static void addReply(redisClient *c, robj *obj) {
          c->replstate == REDIS_REPL_ONLINE) &&
         aeCreateFileEvent(server.el, c->fd, AE_WRITABLE,
         sendReplyToClient, c, NULL) == AE_ERR) return;
+    if (obj->encoding != REDIS_ENCODING_RAW) {
+        obj = getDecodedObject(obj);
+    } else {
+        incrRefCount(obj);
+    }
     if (!listAddNodeTail(c->reply,obj)) oom("listAddNodeTail");
-    incrRefCount(obj);
 }
 
 static void addReplySds(redisClient *c, sds s) {
@@ -1497,9 +1721,30 @@ static void addReplySds(redisClient *c, sds s) {
     decrRefCount(o);
 }
 
+static void addReplyBulkLen(redisClient *c, robj *obj) {
+    size_t len;
+
+    if (obj->encoding == REDIS_ENCODING_RAW) {
+        len = sdslen(obj->ptr);
+    } else {
+        long n = (long)obj->ptr;
+
+        len = 1;
+        if (n < 0) {
+            len++;
+            n = -n;
+        }
+        while((n = n/10) != 0) {
+            len++;
+        }
+    }
+    addReplySds(c,sdscatprintf(sdsempty(),"$%d\r\n",len));
+}
+
 static void acceptHandler(aeEventLoop *el, int fd, void *privdata, int mask) {
     int cport, cfd;
     char cip[128];
+    redisClient *c;
     REDIS_NOTUSED(el);
     REDIS_NOTUSED(mask);
     REDIS_NOTUSED(privdata);
@@ -1510,11 +1755,23 @@ static void acceptHandler(aeEventLoop *el, int fd, void *privdata, int mask) {
         return;
     }
     redisLog(REDIS_DEBUG,"Accepted %s:%d", cip, cport);
-    if (createClient(cfd) == NULL) {
+    if ((c = createClient(cfd)) == NULL) {
         redisLog(REDIS_WARNING,"Error allocating resoures for the client");
         close(cfd); /* May be already closed, just ingore errors */
         return;
     }
+    /* If maxclient directive is set and this is one client more... close the
+     * connection. Note that we create the client instead to check before
+     * for this condition, since now the socket is already set in nonblocking
+     * mode and we can send an error for free using the Kernel I/O */
+    if (server.maxclients && listLength(server.clients) > server.maxclients) {
+        char *err = "-ERR max number of clients reached\r\n";
+
+        /* That's a best effort error message, don't check write errors */
+        (void) write(c->fd,err,strlen(err));
+        freeClient(c);
+        return;
+    }
     server.stat_numconnections++;
 }
 
@@ -1532,6 +1789,7 @@ static robj *createObject(int type, void *ptr) {
     }
     if (!o) oom("createObject");
     o->type = type;
+    o->encoding = REDIS_ENCODING_RAW;
     o->ptr = ptr;
     o->refcount = 1;
     return o;
@@ -1556,7 +1814,9 @@ static robj *createSetObject(void) {
 }
 
 static void freeStringObject(robj *o) {
-    sdsfree(o->ptr);
+    if (o->encoding == REDIS_ENCODING_RAW) {
+        sdsfree(o->ptr);
+    }
 }
 
 static void freeListObject(robj *o) {
@@ -1600,6 +1860,36 @@ static void decrRefCount(void *obj) {
     }
 }
 
+static robj *lookupKey(redisDb *db, robj *key) {
+    dictEntry *de = dictFind(db->dict,key);
+    return de ? dictGetEntryVal(de) : NULL;
+}
+
+static robj *lookupKeyRead(redisDb *db, robj *key) {
+    expireIfNeeded(db,key);
+    return lookupKey(db,key);
+}
+
+static robj *lookupKeyWrite(redisDb *db, robj *key) {
+    deleteIfVolatile(db,key);
+    return lookupKey(db,key);
+}
+
+static int deleteKey(redisDb *db, robj *key) {
+    int retval;
+
+    /* We need to protect key from destruction: after the first dictDelete()
+     * it may happen that 'key' is no longer valid if we don't increment
+     * it's count. This may happen when we get the object reference directly
+     * from the hash table with dictRandomKey() or dict iterators */
+    incrRefCount(key);
+    if (dictSize(db->expires)) dictDelete(db->expires,key);
+    retval = dictDelete(db->dict,key);
+    decrRefCount(key);
+
+    return retval == DICT_OK;
+}
+
 /* Try to share an object against the shared objects pool */
 static robj *tryObjectSharing(robj *o) {
     struct dictEntry *de;
@@ -1645,34 +1935,98 @@ static robj *tryObjectSharing(robj *o) {
     }
 }
 
-static robj *lookupKey(redisDb *db, robj *key) {
-    dictEntry *de = dictFind(db->dict,key);
-    return de ? dictGetEntryVal(de) : NULL;
+/* Check if the nul-terminated string 's' can be represented by a long
+ * (that is, is a number that fits into long without any other space or
+ * character before or after the digits).
+ *
+ * If so, the function returns REDIS_OK and *longval is set to the value
+ * of the number. Otherwise REDIS_ERR is returned */
+static int isStringRepresentableAsLong(char *s, long *longval) {
+    char buf[32], *endptr;
+    long value;
+    int slen;
+    
+    value = strtol(s, &endptr, 10);
+    if (endptr[0] != '\0') return REDIS_ERR;
+    slen = snprintf(buf,32,"%ld",value);
+
+    /* If the number converted back into a string is not identical
+     * then it's not possible to encode the string as integer */
+    if (strlen(buf) != (unsigned)slen || memcmp(buf,s,slen)) return REDIS_ERR;
+    if (longval) *longval = value;
+    return REDIS_OK;
 }
 
-static robj *lookupKeyRead(redisDb *db, robj *key) {
-    expireIfNeeded(db,key);
-    return lookupKey(db,key);
+/* Try to encode a string object in order to save space */
+static int tryObjectEncoding(robj *o) {
+    long value;
+    sds s = o->ptr;
+
+    if (o->encoding != REDIS_ENCODING_RAW)
+        return REDIS_ERR; /* Already encoded */
+
+    /* It's not save to encode shared objects: shared objects can be shared
+     * everywhere in the "object space" of Redis. Encoded objects can only
+     * appear as "values" (and not, for instance, as keys) */
+     if (o->refcount > 1) return REDIS_ERR;
+
+    /* Currently we try to encode only strings */
+    assert(o->type == REDIS_STRING);
+
+    /* Check if we can represent this string as a long integer */
+    if (isStringRepresentableAsLong(s,&value) == REDIS_ERR) return REDIS_ERR;
+
+    /* Ok, this object can be encoded */
+    o->encoding = REDIS_ENCODING_INT;
+    sdsfree(o->ptr);
+    o->ptr = (void*) value;
+    return REDIS_OK;
 }
 
-static robj *lookupKeyWrite(redisDb *db, robj *key) {
-    deleteIfVolatile(db,key);
-    return lookupKey(db,key);
+/* Get a decoded version of an encoded object (returned as a new object) */
+static robj *getDecodedObject(const robj *o) {
+    robj *dec;
+    
+    assert(o->encoding != REDIS_ENCODING_RAW);
+    if (o->type == REDIS_STRING && o->encoding == REDIS_ENCODING_INT) {
+        char buf[32];
+
+        snprintf(buf,32,"%ld",(long)o->ptr);
+        dec = createStringObject(buf,strlen(buf));
+        return dec;
+    } else {
+        assert(1 != 1);
+    }
 }
 
-static int deleteKey(redisDb *db, robj *key) {
-    int retval;
+static int compareStringObjects(robj *a, robj *b) {
+    assert(a->type == REDIS_STRING && b->type == REDIS_STRING);
 
-    /* We need to protect key from destruction: after the first dictDelete()
-     * it may happen that 'key' is no longer valid if we don't increment
-     * it's count. This may happen when we get the object reference directly
-     * from the hash table with dictRandomKey() or dict iterators */
-    incrRefCount(key);
-    if (dictSize(db->expires)) dictDelete(db->expires,key);
-    retval = dictDelete(db->dict,key);
-    decrRefCount(key);
+    if (a->encoding == REDIS_ENCODING_INT && b->encoding == REDIS_ENCODING_INT){
+        return (long)a->ptr - (long)b->ptr;
+    } else {
+        int retval;
 
-    return retval == DICT_OK;
+        incrRefCount(a);
+        incrRefCount(b);
+        if (a->encoding != REDIS_ENCODING_RAW) a = getDecodedObject(a);
+        if (b->encoding != REDIS_ENCODING_RAW) b = getDecodedObject(a);
+        retval = sdscmp(a->ptr,b->ptr);
+        decrRefCount(a);
+        decrRefCount(b);
+        return retval;
+    }
+}
+
+static size_t stringObjectLen(robj *o) {
+    assert(o->type == REDIS_STRING);
+    if (o->encoding == REDIS_ENCODING_RAW) {
+        return sdslen(o->ptr);
+    } else {
+        char buf[32];
+
+        return snprintf(buf,32,"%ld",(long)o->ptr);
+    }
 }
 
 /*============================ DB saving/loading ============================ */
@@ -1714,7 +2068,7 @@ static int rdbSaveLen(FILE *fp, uint32_t len) {
 /* String objects in the form "2391" "-100" without any space and with a
  * range of values that can fit in an 8, 16 or 32 bit signed value can be
  * encoded as integers to save space */
-int rdbTryIntegerEncoding(sds s, unsigned char *enc) {
+static int rdbTryIntegerEncoding(sds s, unsigned char *enc) {
     long long value;
     char *endptr, buf[32];
 
@@ -1779,10 +2133,12 @@ writeerr:
 
 /* Save a string objet as [len][data] on disk. If the object is a string
  * representation of an integer value we try to safe it in a special form */
-static int rdbSaveStringObject(FILE *fp, robj *obj) {
-    size_t len = sdslen(obj->ptr);
+static int rdbSaveStringObjectRaw(FILE *fp, robj *obj) {
+    size_t len;
     int enclen;
 
+    len = sdslen(obj->ptr);
+
     /* Try integer encoding */
     if (len <= 11) {
         unsigned char buf[5];
@@ -1794,7 +2150,7 @@ static int rdbSaveStringObject(FILE *fp, robj *obj) {
 
     /* Try LZF compression - under 20 bytes it's unable to compress even
      * aaaaaaaaaaaaaaaaaa so skip it */
-    if (1 && len > 20) {
+    if (len > 20) {
         int retval;
 
         retval = rdbSaveLzfStringObject(fp,obj);
@@ -1809,6 +2165,21 @@ static int rdbSaveStringObject(FILE *fp, robj *obj) {
     return 0;
 }
 
+/* Like rdbSaveStringObjectRaw() but handle encoded objects */
+static int rdbSaveStringObject(FILE *fp, robj *obj) {
+    int retval;
+    robj *dec;
+
+    if (obj->encoding != REDIS_ENCODING_RAW) {
+        dec = getDecodedObject(obj);
+        retval = rdbSaveStringObjectRaw(fp,dec);
+        decrRefCount(dec);
+        return retval;
+    } else {
+        return rdbSaveStringObjectRaw(fp,obj);
+    }
+}
+
 /* Save the DB on disk. Return REDIS_ERR on error, REDIS_OK on success */
 static int rdbSave(char *filename) {
     dictIterator *di = NULL;
@@ -1818,7 +2189,7 @@ static int rdbSave(char *filename) {
     int j;
     time_t now = time(NULL);
 
-    snprintf(tmpfile,256,"temp-%d.%ld.rdb",(int)time(NULL),(long int)random());
+    snprintf(tmpfile,256,"temp-%d.rdb", (int) getpid());
     fp = fopen(tmpfile,"w");
     if (!fp) {
         redisLog(REDIS_WARNING, "Failed saving the DB: %s", strerror(errno));
@@ -1939,11 +2310,19 @@ static int rdbSaveBackground(char *filename) {
         }
         redisLog(REDIS_NOTICE,"Background saving started by pid %d",childpid);
         server.bgsaveinprogress = 1;
+        server.bgsavechildpid = childpid;
         return REDIS_OK;
     }
     return REDIS_OK; /* unreached */
 }
 
+static void rdbRemoveTempFile(pid_t childpid) {
+    char tmpfile[256];
+
+    snprintf(tmpfile,256,"temp-%d.rdb", (int) childpid);
+    unlink(tmpfile);
+}
+
 static int rdbLoadType(FILE *fp) {
     unsigned char type;
     if (fread(&type,1,1,fp) == 0) return -1;
@@ -2118,6 +2497,7 @@ static int rdbLoad(char *filename) {
         if (type == REDIS_STRING) {
             /* Read string value */
             if ((o = rdbLoadStringObject(fp,rdbver)) == NULL) goto eoferr;
+            tryObjectEncoding(o);
         } else if (type == REDIS_LIST || type == REDIS_SET) {
             /* Read list/set value */
             uint32_t listlen;
@@ -2130,6 +2510,7 @@ static int rdbLoad(char *filename) {
                 robj *ele;
 
                 if ((ele = rdbLoadStringObject(fp,rdbver)) == NULL) goto eoferr;
+                tryObjectEncoding(ele);
                 if (type == REDIS_LIST) {
                     if (!listAddNodeTail((list*)o->ptr,ele))
                         oom("listAddNodeTail");
@@ -2183,8 +2564,7 @@ static void pingCommand(redisClient *c) {
 }
 
 static void echoCommand(redisClient *c) {
-    addReplySds(c,sdscatprintf(sdsempty(),"$%d\r\n",
-        (int)sdslen(c->argv[1]->ptr)));
+    addReplyBulkLen(c,c->argv[1]);
     addReply(c,c->argv[1]);
     addReply(c,shared.crlf);
 }
@@ -2229,14 +2609,14 @@ static void getCommand(redisClient *c) {
         if (o->type != REDIS_STRING) {
             addReply(c,shared.wrongtypeerr);
         } else {
-            addReplySds(c,sdscatprintf(sdsempty(),"$%d\r\n",(int)sdslen(o->ptr)));
+            addReplyBulkLen(c,o);
             addReply(c,o);
             addReply(c,shared.crlf);
         }
     }
 }
 
-static void getSetCommand(redisClient *c) {
+static void getsetCommand(redisClient *c) {
     getCommand(c);
     if (dictAdd(c->db->dict,c->argv[1],c->argv[2]) == DICT_ERR) {
         dictReplace(c->db->dict,c->argv[1],c->argv[2]);
@@ -2260,7 +2640,7 @@ static void mgetCommand(redisClient *c) {
             if (o->type != REDIS_STRING) {
                 addReply(c,shared.nullbulk);
             } else {
-                addReplySds(c,sdscatprintf(sdsempty(),"$%d\r\n",(int)sdslen(o->ptr)));
+                addReplyBulkLen(c,o);
                 addReply(c,o);
                 addReply(c,shared.crlf);
             }
@@ -2282,12 +2662,18 @@ static void incrDecrCommand(redisClient *c, long long incr) {
         } else {
             char *eptr;
 
-            value = strtoll(o->ptr, &eptr, 10);
+            if (o->encoding == REDIS_ENCODING_RAW)
+                value = strtoll(o->ptr, &eptr, 10);
+            else if (o->encoding == REDIS_ENCODING_INT)
+                value = (long)o->ptr;
+            else
+                assert(1 != 1);
         }
     }
 
     value += incr;
     o = createObject(REDIS_STRING,sdscatprintf(sdsempty(),"%lld",value));
+    tryObjectEncoding(o);
     retval = dictAdd(c->db->dict,c->argv[1],o);
     if (retval == DICT_ERR) {
         dictReplace(c->db->dict,c->argv[1],o);
@@ -2461,15 +2847,26 @@ static void bgsaveCommand(redisClient *c) {
 
 static void shutdownCommand(redisClient *c) {
     redisLog(REDIS_WARNING,"User requested shutdown, saving DB...");
-    /* XXX: TODO kill the child if there is a bgsave in progress */
+    /* Kill the saving child if there is a background saving in progress.
+       We want to avoid race conditions, for instance our saving child may
+       overwrite the synchronous saving did by SHUTDOWN. */
+    if (server.bgsaveinprogress) {
+        redisLog(REDIS_WARNING,"There is a live saving child. Killing it!");
+        kill(server.bgsavechildpid,SIGKILL);
+        rdbRemoveTempFile(server.bgsavechildpid);
+    }
+    /* SYNC SAVE */
     if (rdbSave(server.dbfilename) == REDIS_OK) {
-        if (server.daemonize) {
+        if (server.daemonize)
             unlink(server.pidfile);
-        }
         redisLog(REDIS_WARNING,"%zu bytes used at exit",zmalloc_used_memory());
         redisLog(REDIS_WARNING,"Server exit now, bye bye...");
         exit(1);
     } else {
+        /* Ooops.. error saving! The best we can do is to continue operating.
+         * Note that if there was a background saving process, in the next
+         * cron() Redis will be notified that the background saving aborted,
+         * handling special stuff like slaves pending for synchronization... */
         redisLog(REDIS_WARNING,"Error trying to save the DB, can't exit"); 
         addReplySds(c,sdsnew("-ERR can't quit, problems saving the DB\r\n"));
     }
@@ -2637,7 +3034,7 @@ static void lindexCommand(redisClient *c) {
                 addReply(c,shared.nullbulk);
             } else {
                 robj *ele = listNodeValue(ln);
-                addReplySds(c,sdscatprintf(sdsempty(),"$%d\r\n",(int)sdslen(ele->ptr)));
+                addReplyBulkLen(c,ele);
                 addReply(c,ele);
                 addReply(c,shared.crlf);
             }
@@ -2697,7 +3094,7 @@ static void popGenericCommand(redisClient *c, int where) {
                 addReply(c,shared.nullbulk);
             } else {
                 robj *ele = listNodeValue(ln);
-                addReplySds(c,sdscatprintf(sdsempty(),"$%d\r\n",(int)sdslen(ele->ptr)));
+                addReplyBulkLen(c,ele);
                 addReply(c,ele);
                 addReply(c,shared.crlf);
                 listDelNode(list,ln);
@@ -2753,7 +3150,7 @@ static void lrangeCommand(redisClient *c) {
             addReplySds(c,sdscatprintf(sdsempty(),"*%d\r\n",rangelen));
             for (j = 0; j < rangelen; j++) {
                 ele = listNodeValue(ln);
-                addReplySds(c,sdscatprintf(sdsempty(),"$%d\r\n",(int)sdslen(ele->ptr)));
+                addReplyBulkLen(c,ele);
                 addReply(c,ele);
                 addReply(c,shared.crlf);
                 ln = ln->next;
@@ -2805,8 +3202,8 @@ static void ltrimCommand(redisClient *c) {
                 ln = listLast(list);
                 listDelNode(list,ln);
             }
-            addReply(c,shared.ok);
             server.dirty++;
+            addReply(c,shared.ok);
         }
     }
 }
@@ -2816,7 +3213,7 @@ static void lremCommand(redisClient *c) {
     
     o = lookupKeyWrite(c->db,c->argv[1]);
     if (o == NULL) {
-        addReply(c,shared.nokeyerr);
+        addReply(c,shared.czero);
     } else {
         if (o->type != REDIS_LIST) {
             addReply(c,shared.wrongtypeerr);
@@ -2836,7 +3233,7 @@ static void lremCommand(redisClient *c) {
                 robj *ele = listNodeValue(ln);
 
                 next = fromtail ? ln->prev : ln->next;
-                if (sdscmp(ele->ptr,c->argv[3]->ptr) == 0) {
+                if (compareStringObjects(ele,c->argv[3]) == 0) {
                     listDelNode(list,ln);
                     server.dirty++;
                     removed++;
@@ -2887,6 +3284,7 @@ static void sremCommand(redisClient *c) {
         }
         if (dictDelete(set->ptr,c->argv[2]) == DICT_OK) {
             server.dirty++;
+            if (htNeedsResize(set->ptr)) dictResize(set->ptr);
             addReply(c,shared.cone);
         } else {
             addReply(c,shared.czero);
@@ -2966,6 +3364,34 @@ static void scardCommand(redisClient *c) {
     }
 }
 
+static void spopCommand(redisClient *c) {
+    robj *set;
+    dictEntry *de;
+
+    set = lookupKeyWrite(c->db,c->argv[1]);
+    if (set == NULL) {
+        addReply(c,shared.nullbulk);
+    } else {
+        if (set->type != REDIS_SET) {
+            addReply(c,shared.wrongtypeerr);
+            return;
+        }
+        de = dictGetRandomKey(set->ptr);
+        if (de == NULL) {
+            addReply(c,shared.nullbulk);
+        } else {
+            robj *ele = dictGetEntryKey(de);
+
+            addReplyBulkLen(c,ele);
+            addReply(c,ele);
+            addReply(c,shared.crlf);
+            dictDelete(set->ptr,ele);
+            if (htNeedsResize(set->ptr)) dictResize(set->ptr);
+            server.dirty++;
+        }
+    }
+}
+
 static int qsortCompareSetsByCardinality(const void *s1, const void *s2) {
     dict **d1 = (void*) s1, **d2 = (void*) s2;
 
@@ -3037,7 +3463,7 @@ static void sinterGenericCommand(redisClient *c, robj **setskeys, int setsnum, r
             continue; /* at least one set does not contain the member */
         ele = dictGetEntryKey(de);
         if (!dstkey) {
-            addReplySds(c,sdscatprintf(sdsempty(),"$%d\r\n",sdslen(ele->ptr)));
+            addReplyBulkLen(c,ele);
             addReply(c,ele);
             addReply(c,shared.crlf);
             cardinality++;
@@ -3146,8 +3572,7 @@ static void sunionDiffGenericCommand(redisClient *c, robj **setskeys, int setsnu
             robj *ele;
 
             ele = dictGetEntryKey(de);
-            addReplySds(c,sdscatprintf(sdsempty(),
-                    "$%d\r\n",sdslen(ele->ptr)));
+            addReplyBulkLen(c,ele);
             addReply(c,ele);
             addReply(c,shared.crlf);
         }
@@ -3201,7 +3626,7 @@ static void flushallCommand(redisClient *c) {
     server.dirty++;
 }
 
-redisSortOperation *createSortOperation(int type, robj *pattern) {
+static redisSortOperation *createSortOperation(int type, robj *pattern) {
     redisSortOperation *so = zmalloc(sizeof(*so));
     if (!so) oom("createSortOperation");
     so->type = type;
@@ -3211,7 +3636,7 @@ redisSortOperation *createSortOperation(int type, robj *pattern) {
 
 /* Return the value associated to the key with a name obtained
  * substituting the first occurence of '*' in 'pattern' with 'subst' */
-robj *lookupKeyByPattern(redisDb *db, robj *pattern, robj *subst) {
+static robj *lookupKeyByPattern(redisDb *db, robj *pattern, robj *subst) {
     char *p;
     sds spat, ssub;
     robj keyobj;
@@ -3223,6 +3648,12 @@ robj *lookupKeyByPattern(redisDb *db, robj *pattern, robj *subst) {
         char buf[REDIS_SORTKEY_MAX+1];
     } keyname;
 
+    if (subst->encoding == REDIS_ENCODING_RAW)
+        incrRefCount(subst);
+    else {
+        subst = getDecodedObject(subst);
+    }
+
     spat = pattern->ptr;
     ssub = subst->ptr;
     if (sdslen(spat)+sdslen(ssub)-1 > REDIS_SORTKEY_MAX) return NULL;
@@ -3242,6 +3673,8 @@ robj *lookupKeyByPattern(redisDb *db, robj *pattern, robj *subst) {
     keyobj.type = REDIS_STRING;
     keyobj.ptr = ((char*)&keyname)+(sizeof(long)*2);
 
+    decrRefCount(subst);
+
     /* printf("lookup '%s' => %p\n", keyname.buf,de); */
     return lookupKeyRead(db,&keyobj);
 }
@@ -3279,7 +3712,20 @@ static int sortCompare(const void *s1, const void *s2) {
             }
         } else {
             /* Compare elements directly */
-            cmp = strcoll(so1->obj->ptr,so2->obj->ptr);
+            if (so1->obj->encoding == REDIS_ENCODING_RAW &&
+                so2->obj->encoding == REDIS_ENCODING_RAW) {
+                cmp = strcoll(so1->obj->ptr,so2->obj->ptr);
+            } else {
+                robj *dec1, *dec2;
+
+                dec1 = so1->obj->encoding == REDIS_ENCODING_RAW ?
+                    so1->obj : getDecodedObject(so1->obj);
+                dec2 = so2->obj->encoding == REDIS_ENCODING_RAW ?
+                    so2->obj : getDecodedObject(so2->obj);
+                cmp = strcoll(dec1->ptr,dec2->ptr);
+                if (dec1 != so1->obj) decrRefCount(dec1);
+                if (dec2 != so2->obj) decrRefCount(dec2);
+            }
         }
     }
     return server.sort_desc ? -cmp : cmp;
@@ -3409,13 +3855,33 @@ static void sortCommand(redisClient *c) {
                 byval = lookupKeyByPattern(c->db,sortby,vector[j].obj);
                 if (!byval || byval->type != REDIS_STRING) continue;
                 if (alpha) {
-                    vector[j].u.cmpobj = byval;
-                    incrRefCount(byval);
+                    if (byval->encoding == REDIS_ENCODING_RAW) {
+                        vector[j].u.cmpobj = byval;
+                        incrRefCount(byval);
+                    } else {
+                        vector[j].u.cmpobj = getDecodedObject(byval);
+                    }
                 } else {
-                    vector[j].u.score = strtod(byval->ptr,NULL);
+                    if (byval->encoding == REDIS_ENCODING_RAW) {
+                        vector[j].u.score = strtod(byval->ptr,NULL);
+                    } else {
+                        if (byval->encoding == REDIS_ENCODING_INT) {
+                            vector[j].u.score = (long)byval->ptr;
+                        } else
+                            assert(1 != 1);
+                    }
                 }
             } else {
-                if (!alpha) vector[j].u.score = strtod(vector[j].obj->ptr,NULL);
+                if (!alpha) {
+                    if (vector[j].obj->encoding == REDIS_ENCODING_RAW)
+                        vector[j].u.score = strtod(vector[j].obj->ptr,NULL);
+                    else {
+                        if (vector[j].obj->encoding == REDIS_ENCODING_INT)
+                            vector[j].u.score = (long) vector[j].obj->ptr;
+                        else
+                            assert(1 != 1);
+                    }
+                }
             }
         }
     }
@@ -3447,8 +3913,7 @@ static void sortCommand(redisClient *c) {
     for (j = start; j <= end; j++) {
         listNode *ln;
         if (!getop) {
-            addReplySds(c,sdscatprintf(sdsempty(),"$%d\r\n",
-                sdslen(vector[j].obj->ptr)));
+            addReplyBulkLen(c,vector[j].obj);
             addReply(c,vector[j].obj);
             addReply(c,shared.crlf);
         }
@@ -3462,8 +3927,7 @@ static void sortCommand(redisClient *c) {
                 if (!val || val->type != REDIS_STRING) {
                     addReply(c,shared.nullbulk);
                 } else {
-                    addReplySds(c,sdscatprintf(sdsempty(),"$%d\r\n",
-                        sdslen(val->ptr)));
+                    addReplyBulkLen(c,val);
                     addReply(c,val);
                     addReply(c,shared.crlf);
                 }
@@ -3486,9 +3950,11 @@ static void sortCommand(redisClient *c) {
 static void infoCommand(redisClient *c) {
     sds info;
     time_t uptime = time(NULL)-server.stat_starttime;
+    int j;
     
     info = sdscatprintf(sdsempty(),
         "redis_version:%s\r\n"
+        "arch_bits:%s\r\n"
         "uptime_in_seconds:%d\r\n"
         "uptime_in_days:%d\r\n"
         "connected_clients:%d\r\n"
@@ -3501,6 +3967,7 @@ static void infoCommand(redisClient *c) {
         "total_commands_processed:%lld\r\n"
         "role:%s\r\n"
         ,REDIS_VERSION,
+        (sizeof(long) == 8) ? "64" : "32",
         uptime,
         uptime/(3600*24),
         listLength(server.clients)-listLength(server.slaves),
@@ -3526,6 +3993,16 @@ static void infoCommand(redisClient *c) {
             (int)(time(NULL)-server.master->lastinteraction)
         );
     }
+    for (j = 0; j < server.dbnum; j++) {
+        long long keys, vkeys;
+
+        keys = dictSize(server.db[j].dict);
+        vkeys = dictSize(server.db[j].expires);
+        if (keys || vkeys) {
+            info = sdscatprintf(info, "db%d: keys=%lld,expires=%lld\r\n",
+                j, keys, vkeys);
+        }
+    }
     addReplySds(c,sdscatprintf(sdsempty(),"$%d\r\n",sdslen(info)));
     addReplySds(c,info);
     addReply(c,shared.crlf);
@@ -3615,10 +4092,12 @@ static void expireCommand(redisClient *c) {
         return;
     } else {
         time_t when = time(NULL)+seconds;
-        if (setExpire(c->db,c->argv[1],when))
+        if (setExpire(c->db,c->argv[1],when)) {
             addReply(c,shared.cone);
-        else
+            server.dirty++;
+        } else {
             addReply(c,shared.czero);
+        }
         return;
     }
 }
@@ -3635,6 +4114,42 @@ static void ttlCommand(redisClient *c) {
     addReplySds(c,sdscatprintf(sdsempty(),":%d\r\n",ttl));
 }
 
+static void msetGenericCommand(redisClient *c, int nx) {
+    int j;
+
+    if ((c->argc % 2) == 0) {
+        addReplySds(c,sdsnew("-ERR wrong number of arguments\r\n"));
+        return;
+    }
+    /* Handle the NX flag. The MSETNX semantic is to return zero and don't
+     * set nothing at all if at least one already key exists. */
+    if (nx) {
+        for (j = 1; j < c->argc; j += 2) {
+            if (dictFind(c->db->dict,c->argv[j]) != NULL) {
+                addReply(c, shared.czero);
+                return;
+            }
+        }
+    }
+
+    for (j = 1; j < c->argc; j += 2) {
+        dictAdd(c->db->dict,c->argv[j],c->argv[j+1]);
+        incrRefCount(c->argv[j]);
+        incrRefCount(c->argv[j+1]);
+        removeExpire(c->db,c->argv[j]);
+    }
+    server.dirty += (c->argc-1)/2;
+    addReply(c, nx ? shared.cone : shared.ok);
+}
+
+static void msetCommand(redisClient *c) {
+    msetGenericCommand(c,0);
+}
+
+static void msetnxCommand(redisClient *c) {
+    msetGenericCommand(c,1);
+}
+
 /* =============================== Replication  ============================= */
 
 static int syncWrite(int fd, char *ptr, ssize_t size, int timeout) {
@@ -3812,7 +4327,13 @@ static void sendBulkToSlave(aeEventLoop *el, int fd, void *privdata, int mask) {
     }
 }
 
-static void updateSalvesWaitingBgsave(int bgsaveerr) {
+/* This function is called at the end of every backgrond saving.
+ * The argument bgsaveerr is REDIS_OK if the background saving succeeded
+ * otherwise REDIS_ERR is passed to the function.
+ *
+ * The goal of this function is to handle slaves waiting for a successful
+ * background saving in order to perform non-blocking synchronization. */
+static void updateSlavesWaitingBgsave(int bgsaveerr) {
     listNode *ln;
     int startbgsave = 0;
 
@@ -3824,7 +4345,7 @@ static void updateSalvesWaitingBgsave(int bgsaveerr) {
             startbgsave = 1;
             slave->replstate = REDIS_REPL_WAIT_BGSAVE_END;
         } else if (slave->replstate == REDIS_REPL_WAIT_BGSAVE_END) {
-            struct stat buf;
+            struct redis_stat buf;
            
             if (bgsaveerr != REDIS_OK) {
                 freeClient(slave);
@@ -3832,7 +4353,7 @@ static void updateSalvesWaitingBgsave(int bgsaveerr) {
                 continue;
             }
             if ((slave->repldbfd = open(server.dbfilename,O_RDONLY)) == -1 ||
-                fstat(slave->repldbfd,&buf) == -1) {
+                redis_fstat(slave->repldbfd,&buf) == -1) {
                 freeClient(slave);
                 redisLog(REDIS_WARNING,"SYNC failed. Can't open/stat DB after BGSAVE: %s", strerror(errno));
                 continue;
@@ -3957,6 +4478,307 @@ static void slaveofCommand(redisClient *c) {
     addReply(c,shared.ok);
 }
 
+/* ============================ Maxmemory directive  ======================== */
+
+/* This function gets called when 'maxmemory' is set on the config file to limit
+ * the max memory used by the server, and we are out of memory.
+ * This function will try to, in order:
+ *
+ * - Free objects from the free list
+ * - Try to remove keys with an EXPIRE set
+ *
+ * It is not possible to free enough memory to reach used-memory < maxmemory
+ * the server will start refusing commands that will enlarge even more the
+ * memory usage.
+ */
+static void freeMemoryIfNeeded(void) {
+    while (server.maxmemory && zmalloc_used_memory() > server.maxmemory) {
+        if (listLength(server.objfreelist)) {
+            robj *o;
+
+            listNode *head = listFirst(server.objfreelist);
+            o = listNodeValue(head);
+            listDelNode(server.objfreelist,head);
+            zfree(o);
+        } else {
+            int j, k, freed = 0;
+
+            for (j = 0; j < server.dbnum; j++) {
+                int minttl = -1;
+                robj *minkey = NULL;
+                struct dictEntry *de;
+
+                if (dictSize(server.db[j].expires)) {
+                    freed = 1;
+                    /* From a sample of three keys drop the one nearest to
+                     * the natural expire */
+                    for (k = 0; k < 3; k++) {
+                        time_t t;
+
+                        de = dictGetRandomKey(server.db[j].expires);
+                        t = (time_t) dictGetEntryVal(de);
+                        if (minttl == -1 || t < minttl) {
+                            minkey = dictGetEntryKey(de);
+                            minttl = t;
+                        }
+                    }
+                    deleteKey(server.db+j,minkey);
+                }
+            }
+            if (!freed) return; /* nothing to free... */
+        }
+    }
+}
+
+/* ================================= Debugging ============================== */
+
+static void debugCommand(redisClient *c) {
+    if (!strcasecmp(c->argv[1]->ptr,"segfault")) {
+        *((char*)-1) = 'x';
+    } else if (!strcasecmp(c->argv[1]->ptr,"object") && c->argc == 3) {
+        dictEntry *de = dictFind(c->db->dict,c->argv[2]);
+        robj *key, *val;
+
+        if (!de) {
+            addReply(c,shared.nokeyerr);
+            return;
+        }
+        key = dictGetEntryKey(de);
+        val = dictGetEntryVal(de);
+        addReplySds(c,sdscatprintf(sdsempty(),
+            "+Key at:%p refcount:%d, value at:%p refcount:%d encoding:%d\r\n",
+                key, key->refcount, val, val->refcount, val->encoding));
+    } else {
+        addReplySds(c,sdsnew(
+            "-ERR Syntax error, try DEBUG [SEGFAULT|OBJECT <key>]\r\n"));
+    }
+}
+
+#ifdef HAVE_BACKTRACE
+static struct redisFunctionSym symsTable[] = {
+{"compareStringObjects", (unsigned long)compareStringObjects},
+{"isStringRepresentableAsLong", (unsigned long)isStringRepresentableAsLong},
+{"dictEncObjKeyCompare", (unsigned long)dictEncObjKeyCompare},
+{"dictEncObjHash", (unsigned long)dictEncObjHash},
+{"incrDecrCommand", (unsigned long)incrDecrCommand},
+{"freeStringObject", (unsigned long)freeStringObject},
+{"freeListObject", (unsigned long)freeListObject},
+{"freeSetObject", (unsigned long)freeSetObject},
+{"decrRefCount", (unsigned long)decrRefCount},
+{"createObject", (unsigned long)createObject},
+{"freeClient", (unsigned long)freeClient},
+{"rdbLoad", (unsigned long)rdbLoad},
+{"rdbSaveStringObject", (unsigned long)rdbSaveStringObject},
+{"rdbSaveStringObjectRaw", (unsigned long)rdbSaveStringObjectRaw},
+{"addReply", (unsigned long)addReply},
+{"addReplySds", (unsigned long)addReplySds},
+{"incrRefCount", (unsigned long)incrRefCount},
+{"rdbSaveBackground", (unsigned long)rdbSaveBackground},
+{"createStringObject", (unsigned long)createStringObject},
+{"replicationFeedSlaves", (unsigned long)replicationFeedSlaves},
+{"syncWithMaster", (unsigned long)syncWithMaster},
+{"tryObjectSharing", (unsigned long)tryObjectSharing},
+{"tryObjectEncoding", (unsigned long)tryObjectEncoding},
+{"getDecodedObject", (unsigned long)getDecodedObject},
+{"removeExpire", (unsigned long)removeExpire},
+{"expireIfNeeded", (unsigned long)expireIfNeeded},
+{"deleteIfVolatile", (unsigned long)deleteIfVolatile},
+{"deleteKey", (unsigned long)deleteKey},
+{"getExpire", (unsigned long)getExpire},
+{"setExpire", (unsigned long)setExpire},
+{"updateSlavesWaitingBgsave", (unsigned long)updateSlavesWaitingBgsave},
+{"freeMemoryIfNeeded", (unsigned long)freeMemoryIfNeeded},
+{"authCommand", (unsigned long)authCommand},
+{"pingCommand", (unsigned long)pingCommand},
+{"echoCommand", (unsigned long)echoCommand},
+{"setCommand", (unsigned long)setCommand},
+{"setnxCommand", (unsigned long)setnxCommand},
+{"getCommand", (unsigned long)getCommand},
+{"delCommand", (unsigned long)delCommand},
+{"existsCommand", (unsigned long)existsCommand},
+{"incrCommand", (unsigned long)incrCommand},
+{"decrCommand", (unsigned long)decrCommand},
+{"incrbyCommand", (unsigned long)incrbyCommand},
+{"decrbyCommand", (unsigned long)decrbyCommand},
+{"selectCommand", (unsigned long)selectCommand},
+{"randomkeyCommand", (unsigned long)randomkeyCommand},
+{"keysCommand", (unsigned long)keysCommand},
+{"dbsizeCommand", (unsigned long)dbsizeCommand},
+{"lastsaveCommand", (unsigned long)lastsaveCommand},
+{"saveCommand", (unsigned long)saveCommand},
+{"bgsaveCommand", (unsigned long)bgsaveCommand},
+{"shutdownCommand", (unsigned long)shutdownCommand},
+{"moveCommand", (unsigned long)moveCommand},
+{"renameCommand", (unsigned long)renameCommand},
+{"renamenxCommand", (unsigned long)renamenxCommand},
+{"lpushCommand", (unsigned long)lpushCommand},
+{"rpushCommand", (unsigned long)rpushCommand},
+{"lpopCommand", (unsigned long)lpopCommand},
+{"rpopCommand", (unsigned long)rpopCommand},
+{"llenCommand", (unsigned long)llenCommand},
+{"lindexCommand", (unsigned long)lindexCommand},
+{"lrangeCommand", (unsigned long)lrangeCommand},
+{"ltrimCommand", (unsigned long)ltrimCommand},
+{"typeCommand", (unsigned long)typeCommand},
+{"lsetCommand", (unsigned long)lsetCommand},
+{"saddCommand", (unsigned long)saddCommand},
+{"sremCommand", (unsigned long)sremCommand},
+{"smoveCommand", (unsigned long)smoveCommand},
+{"sismemberCommand", (unsigned long)sismemberCommand},
+{"scardCommand", (unsigned long)scardCommand},
+{"spopCommand", (unsigned long)spopCommand},
+{"sinterCommand", (unsigned long)sinterCommand},
+{"sinterstoreCommand", (unsigned long)sinterstoreCommand},
+{"sunionCommand", (unsigned long)sunionCommand},
+{"sunionstoreCommand", (unsigned long)sunionstoreCommand},
+{"sdiffCommand", (unsigned long)sdiffCommand},
+{"sdiffstoreCommand", (unsigned long)sdiffstoreCommand},
+{"syncCommand", (unsigned long)syncCommand},
+{"flushdbCommand", (unsigned long)flushdbCommand},
+{"flushallCommand", (unsigned long)flushallCommand},
+{"sortCommand", (unsigned long)sortCommand},
+{"lremCommand", (unsigned long)lremCommand},
+{"infoCommand", (unsigned long)infoCommand},
+{"mgetCommand", (unsigned long)mgetCommand},
+{"monitorCommand", (unsigned long)monitorCommand},
+{"expireCommand", (unsigned long)expireCommand},
+{"getsetCommand", (unsigned long)getsetCommand},
+{"ttlCommand", (unsigned long)ttlCommand},
+{"slaveofCommand", (unsigned long)slaveofCommand},
+{"debugCommand", (unsigned long)debugCommand},
+{"processCommand", (unsigned long)processCommand},
+{"setupSigSegvAction", (unsigned long)setupSigSegvAction},
+{"readQueryFromClient", (unsigned long)readQueryFromClient},
+{"rdbRemoveTempFile", (unsigned long)rdbRemoveTempFile},
+{"msetGenericCommand", (unsigned long)msetGenericCommand},
+{"msetCommand", (unsigned long)msetCommand},
+{"msetnxCommand", (unsigned long)msetnxCommand},
+{NULL,0}
+};
+
+/* This function try to convert a pointer into a function name. It's used in
+ * oreder to provide a backtrace under segmentation fault that's able to
+ * display functions declared as static (otherwise the backtrace is useless). */
+static char *findFuncName(void *pointer, unsigned long *offset){
+    int i, ret = -1;
+    unsigned long off, minoff = 0;
+
+    /* Try to match against the Symbol with the smallest offset */
+    for (i=0; symsTable[i].pointer; i++) {
+        unsigned long lp = (unsigned long) pointer;
+
+        if (lp != (unsigned long)-1 && lp >= symsTable[i].pointer) {
+            off=lp-symsTable[i].pointer;
+            if (ret < 0 || off < minoff) {
+                minoff=off;
+                ret=i;
+            }
+        }
+    }
+    if (ret == -1) return NULL;
+    *offset = minoff;
+    return symsTable[ret].name;
+}
+
+static void *getMcontextEip(ucontext_t *uc) {
+#if defined(__FreeBSD__)
+    return (void*) uc->uc_mcontext.mc_eip;
+#elif defined(__dietlibc__)
+    return (void*) uc->uc_mcontext.eip;
+#elif defined(__APPLE__) && !defined(MAC_OS_X_VERSION_10_6)
+    return (void*) uc->uc_mcontext->__ss.__eip;
+#elif defined(__APPLE__) && defined(MAC_OS_X_VERSION_10_6)
+  #ifdef _STRUCT_X86_THREAD_STATE64
+    return (void*) uc->uc_mcontext->__ss.__rip;
+  #else
+    return (void*) uc->uc_mcontext->__ss.__eip;
+  #endif 
+#elif defined(__i386__) || defined(__X86_64__) /* Linux x86 */
+    return (void*) uc->uc_mcontext.gregs[REG_EIP];
+#elif defined(__ia64__) /* Linux IA64 */
+    return (void*) uc->uc_mcontext.sc_ip;
+#else
+    return NULL;
+#endif
+}
+
+static void segvHandler(int sig, siginfo_t *info, void *secret) {
+    void *trace[100];
+    char **messages = NULL;
+    int i, trace_size = 0;
+    unsigned long offset=0;
+    time_t uptime = time(NULL)-server.stat_starttime;
+    ucontext_t *uc = (ucontext_t*) secret;
+    REDIS_NOTUSED(info);
+
+    redisLog(REDIS_WARNING,
+        "======= Ooops! Redis %s got signal: -%d- =======", REDIS_VERSION, sig);
+    redisLog(REDIS_WARNING, "%s", sdscatprintf(sdsempty(),
+        "redis_version:%s; "
+        "uptime_in_seconds:%d; "
+        "connected_clients:%d; "
+        "connected_slaves:%d; "
+        "used_memory:%zu; "
+        "changes_since_last_save:%lld; "
+        "bgsave_in_progress:%d; "
+        "last_save_time:%d; "
+        "total_connections_received:%lld; "
+        "total_commands_processed:%lld; "
+        "role:%s;"
+        ,REDIS_VERSION,
+        uptime,
+        listLength(server.clients)-listLength(server.slaves),
+        listLength(server.slaves),
+        server.usedmemory,
+        server.dirty,
+        server.bgsaveinprogress,
+        server.lastsave,
+        server.stat_numconnections,
+        server.stat_numcommands,
+        server.masterhost == NULL ? "master" : "slave"
+    ));
+    
+    trace_size = backtrace(trace, 100);
+    /* overwrite sigaction with caller's address */
+    if (getMcontextEip(uc) != NULL) {
+        trace[1] = getMcontextEip(uc);
+    }
+    messages = backtrace_symbols(trace, trace_size);
+
+    for (i=1; i<trace_size; ++i) {
+        char *fn = findFuncName(trace[i], &offset), *p;
+
+        p = strchr(messages[i],'+');
+        if (!fn || (p && ((unsigned long)strtol(p+1,NULL,10)) < offset)) {
+            redisLog(REDIS_WARNING,"%s", messages[i]);
+        } else {
+            redisLog(REDIS_WARNING,"%d redis-server %p %s + %d", i, trace[i], fn, (unsigned int)offset);
+        }
+    }
+    free(messages);
+    exit(0);
+}
+
+static void setupSigSegvAction(void) {
+    struct sigaction act;
+
+    sigemptyset (&act.sa_mask);
+    /* When the SA_SIGINFO flag is set in sa_flags then sa_sigaction
+     * is used. Otherwise, sa_handler is used */
+    act.sa_flags = SA_NODEFER | SA_ONSTACK | SA_RESETHAND | SA_SIGINFO;
+    act.sa_sigaction = segvHandler;
+    sigaction (SIGSEGV, &act, NULL);
+    sigaction (SIGBUS, &act, NULL);
+    sigaction (SIGFPE, &act, NULL);
+    sigaction (SIGILL, &act, NULL);
+    sigaction (SIGBUS, &act, NULL);
+    return;
+}
+#else /* HAVE_BACKTRACE */
+static void setupSigSegvAction(void) {
+}
+#endif /* HAVE_BACKTRACE */
+
 /* =================================== Main! ================================ */
 
 #ifdef __linux__
@@ -3976,7 +4798,7 @@ int linuxOvercommitMemoryValue(void) {
 
 void linuxOvercommitMemoryWarning(void) {
     if (linuxOvercommitMemoryValue() == 0) {
-        redisLog(REDIS_WARNING,"WARNING overcommit_memory is set to 0! Background save may fail under low condition memory. To fix this issue add 'echo 1 > /proc/sys/vm/overcommit_memory' in your init scripts.");
+        redisLog(REDIS_WARNING,"WARNING overcommit_memory is set to 0! Background save may fail under low condition memory. To fix this issue add 'vm.overcommit_memory = 1' to /etc/sysctl.conf and then reboot or run the command 'sysctl vm.overcommit_memory=1' for this to take effect.");
     }
 }
 #endif /* __linux__ */
@@ -4006,10 +4828,6 @@ static void daemonize(void) {
 }
 
 int main(int argc, char **argv) {
-#ifdef __linux__
-    linuxOvercommitMemoryWarning();
-#endif
-
     initServerConfig();
     if (argc == 2) {
         ResetServerSaveParams();
@@ -4023,6 +4841,9 @@ int main(int argc, char **argv) {
     initServer();
     if (server.daemonize) daemonize();
     redisLog(REDIS_NOTICE,"Server started, Redis version " REDIS_VERSION);
+#ifdef __linux__
+    linuxOvercommitMemoryWarning();
+#endif
     if (rdbLoad(server.dbfilename) == REDIS_OK)
         redisLog(REDIS_NOTICE,"DB loaded from disk");
     if (aeCreateFileEvent(server.el, server.fd, AE_READABLE,