205 lines
8.5 KiB
C
205 lines
8.5 KiB
C
/*
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* Copyright (c) 2009-2011, Salvatore Sanfilippo <antirez at gmail dot com>
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* Copyright (c) 2010-2011, Pieter Noordhuis <pcnoordhuis at gmail dot com>
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of Redis nor the names of its contributors may be used
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* to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef __HIREDIS_H
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#define __HIREDIS_H
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#include <stdio.h> /* for size_t */
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#include <stdarg.h> /* for va_list */
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#include <sys/time.h> /* for struct timeval */
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#define HIREDIS_MAJOR 0
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#define HIREDIS_MINOR 9
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#define HIREDIS_PATCH 2
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#define REDIS_ERR -1
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#define REDIS_OK 0
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/* When an error occurs, the err flag in a context is set to hold the type of
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* error that occured. REDIS_ERR_IO means there was an I/O error and you
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* should use the "errno" variable to find out what is wrong.
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* For other values, the "errstr" field will hold a description. */
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#define REDIS_ERR_IO 1 /* Error in read or write */
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#define REDIS_ERR_EOF 3 /* End of file */
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#define REDIS_ERR_PROTOCOL 4 /* Protocol error */
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#define REDIS_ERR_OOM 5 /* Out of memory */
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#define REDIS_ERR_OTHER 2 /* Everything else... */
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/* Connection type can be blocking or non-blocking and is set in the
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* least significant bit of the flags field in redisContext. */
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#define REDIS_BLOCK 0x1
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/* Connection may be disconnected before being free'd. The second bit
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* in the flags field is set when the context is connected. */
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#define REDIS_CONNECTED 0x2
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/* The async API might try to disconnect cleanly and flush the output
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* buffer and read all subsequent replies before disconnecting.
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* This flag means no new commands can come in and the connection
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* should be terminated once all replies have been read. */
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#define REDIS_DISCONNECTING 0x4
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/* Flag specific to the async API which means that the context should be clean
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* up as soon as possible. */
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#define REDIS_FREEING 0x8
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/* Flag that is set when an async callback is executed. */
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#define REDIS_IN_CALLBACK 0x10
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/* Flag that is set when the async context has one or more subscriptions. */
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#define REDIS_SUBSCRIBED 0x20
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#define REDIS_REPLY_STRING 1
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#define REDIS_REPLY_ARRAY 2
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#define REDIS_REPLY_INTEGER 3
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#define REDIS_REPLY_NIL 4
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#define REDIS_REPLY_STATUS 5
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#define REDIS_REPLY_ERROR 6
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* This is the reply object returned by redisCommand() */
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typedef struct redisReply {
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int type; /* REDIS_REPLY_* */
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long long integer; /* The integer when type is REDIS_REPLY_INTEGER */
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int len; /* Length of string */
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char *str; /* Used for both REDIS_REPLY_ERROR and REDIS_REPLY_STRING */
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size_t elements; /* number of elements, for REDIS_REPLY_ARRAY */
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struct redisReply **element; /* elements vector for REDIS_REPLY_ARRAY */
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} redisReply;
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typedef struct redisReadTask {
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int type;
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int elements; /* number of elements in multibulk container */
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int idx; /* index in parent (array) object */
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void *obj; /* holds user-generated value for a read task */
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struct redisReadTask *parent; /* parent task */
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void *privdata; /* user-settable arbitrary field */
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} redisReadTask;
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typedef struct redisReplyObjectFunctions {
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void *(*createString)(const redisReadTask*, char*, size_t);
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void *(*createArray)(const redisReadTask*, int);
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void *(*createInteger)(const redisReadTask*, long long);
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void *(*createNil)(const redisReadTask*);
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void (*freeObject)(void*);
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} redisReplyObjectFunctions;
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/* State for the protocol parser */
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typedef struct redisReader {
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int err; /* Error flags, 0 when there is no error */
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char errstr[128]; /* String representation of error when applicable */
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char *buf; /* Read buffer */
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size_t pos; /* Buffer cursor */
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size_t len; /* Buffer length */
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redisReadTask rstack[3];
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int ridx; /* Index of current read task */
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void *reply; /* Temporary reply pointer */
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redisReplyObjectFunctions *fn;
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void *privdata;
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} redisReader;
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/* Public API for the protocol parser. */
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redisReader *redisReaderCreate(void);
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void redisReaderFree(redisReader *r);
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int redisReaderFeed(redisReader *r, const char *buf, size_t len);
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int redisReaderGetReply(redisReader *r, void **reply);
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/* Backwards compatibility, can be removed on big version bump. */
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#define redisReplyReaderCreate redisReaderCreate
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#define redisReplyReaderFree redisReaderFree
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#define redisReplyReaderFeed redisReaderFeed
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#define redisReplyReaderGetReply redisReaderGetReply
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#define redisReplyReaderSetPrivdata(_r, _p) (int)(((redisReader*)(_r))->privdata = (_p))
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#define redisReplyReaderGetObject(_r) (((redisReader*)(_r))->reply)
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#define redisReplyReaderGetError(_r) (((redisReader*)(_r))->errstr)
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/* Function to free the reply objects hiredis returns by default. */
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void freeReplyObject(void *reply);
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/* Functions to format a command according to the protocol. */
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int redisvFormatCommand(char **target, const char *format, va_list ap);
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int redisFormatCommand(char **target, const char *format, ...);
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int redisFormatCommandArgv(char **target, int argc, const char **argv, const size_t *argvlen);
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/* Context for a connection to Redis */
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typedef struct redisContext {
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int err; /* Error flags, 0 when there is no error */
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char errstr[128]; /* String representation of error when applicable */
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int fd;
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int flags;
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char *obuf; /* Write buffer */
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redisReader *reader; /* Protocol reader */
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} redisContext;
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redisContext *redisConnect(const char *ip, int port);
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redisContext *redisConnectWithTimeout(const char *ip, int port, struct timeval tv);
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redisContext *redisConnectNonBlock(const char *ip, int port);
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redisContext *redisConnectUnix(const char *path);
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redisContext *redisConnectUnixWithTimeout(const char *path, struct timeval tv);
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redisContext *redisConnectUnixNonBlock(const char *path);
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int redisSetTimeout(redisContext *c, struct timeval tv);
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void redisFree(redisContext *c);
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int redisBufferRead(redisContext *c);
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int redisBufferWrite(redisContext *c, int *done);
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/* In a blocking context, this function first checks if there are unconsumed
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* replies to return and returns one if so. Otherwise, it flushes the output
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* buffer to the socket and reads until it has a reply. In a non-blocking
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* context, it will return unconsumed replies until there are no more. */
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int redisGetReply(redisContext *c, void **reply);
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int redisGetReplyFromReader(redisContext *c, void **reply);
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/* Write a command to the output buffer. Use these functions in blocking mode
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* to get a pipeline of commands. */
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int redisvAppendCommand(redisContext *c, const char *format, va_list ap);
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int redisAppendCommand(redisContext *c, const char *format, ...);
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int redisAppendCommandArgv(redisContext *c, int argc, const char **argv, const size_t *argvlen);
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/* Issue a command to Redis. In a blocking context, it is identical to calling
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* redisAppendCommand, followed by redisGetReply. The function will return
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* NULL if there was an error in performing the request, otherwise it will
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* return the reply. In a non-blocking context, it is identical to calling
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* only redisAppendCommand and will always return NULL. */
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void *redisvCommand(redisContext *c, const char *format, va_list ap);
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void *redisCommand(redisContext *c, const char *format, ...);
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void *redisCommandArgv(redisContext *c, int argc, const char **argv, const size_t *argvlen);
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#ifdef __cplusplus
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}
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#endif
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#endif
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