Linux version 4.4.0-22-generic (buildd@lgw01-41)
(gcc version 5.3.1 20160413 (Ubuntu 5.3.1-14ubuntu2) )
#40-Ubuntu SMP Thu May 12 22:03:46 UTC 2016

wget http://download.redis.io/releases/redis-3.0.6.tar.gz
tar xzf redis-3.0.6.tar.gz
cd redis-3.0.6
make

wget https://github.com/redis/hiredis/archive/master.zip
unzip master.zip

make
sudo make install

mkdir -p /usr/local/include/hiredis /usr/local/lib
cp -a hiredis.h async.h read.h sds.h adapters /usr/local/include/hiredis
cp -a libhiredis.so /usr/local/lib/libhiredis.so.0.13
cd /usr/local/lib && ln -sf libhiredis.so.0.13 libhiredis.so
cp -a libhiredis.a /usr/local/lib
mkdir -p /usr/local/lib/pkgconfig
cp -a hiredis.pc /usr/local/lib/pkgconfig

/** redis链接函数, 返回redis上下文.* ip    : 链接地址的ip* port    : 链接端口*         : 返回 redis上下文, NULL表示获取失败*/
redisContext *redisConnect(const char *ip, int port)/**  执行redis操作命令, 返回得到的结果集*    context    : redisConnect 返回的redis上下文对象*    format    : 等同于 printf格式控制符*    ...        : 后面可变参数, 需要和 format中格式符对应*            : 返回 得到的结果集*/
void *redisCommand(redisContext *context, const char *format, ...);/** 释放redis命令操作返回过来的结果集* reply    : redisCommand返回的结果集*/
void freeReplyObject(void *reply);/** 释放链接上下文* context    : redisConnect返回的链接上下文*/
void redisFree(redisContext *context);

第一个是 redisConnect 返回的 redisContext上下文结构
/* Context for a connection to Redis */
typedef struct redisContext {int err; /* Error flags, 0 when there is no error */char errstr[128]; /* String representation of error when applicable */int fd;int flags;char *obuf; /* Write buffer */redisReader *reader; /* Protocol reader */enum redisConnectionType connection_type;struct timeval *timeout;struct {char *host;char *source_addr;int port;} tcp;struct {char *path;} unix_sock;
} redisContext;还有一个是 redisCommand 返回的命令集
/* This is the reply object returned by redisCommand() */
typedef struct redisReply {int type; /* REDIS_REPLY_* */long long integer; /* The integer when type is REDIS_REPLY_INTEGER */int len; /* Length of string */char *str; /* Used for both REDIS_REPLY_ERROR and REDIS_REPLY_STRING */size_t elements; /* number of elements, for REDIS_REPLY_ARRAY */struct redisReply **element; /* elements vector for REDIS_REPLY_ARRAY */
} redisReply;

#include <stdio.h>
#include <stdlib.h>
#include <hiredis/hiredis.h>/** 请求 redis网络缓存服务器内存.*/
int main(int argc, char* argv[]) {redisContext *conn = redisConnect("127.0.0.1", 6379);if(NULL == conn) {fprintf(stderr, "redisConnect 127.0.0.1:6379 error!\n");exit(EXIT_FAILURE);}   if(conn->err) {fprintf(stderr, "redisConect error:%d\n", conn->err);redisFree(conn);exit(EXIT_FAILURE);}   // 这里redisConnect 链接对象创建完毕了redisReply *reply = redisCommand(conn, "get foo");if(reply && reply->type == REDIS_REPLY_STRING) {printf("get foo => %s\n", reply->str);}   printf("reply->type = %d\n", reply->type);// 释放这个对象
    freeReplyObject(reply);// 释放hiredis 上下文对象
    redisFree(conn);return 0;
}

gcc -Wall -ggdb -o simpleget.out simpleget.c -lhiredis

 find . -name *.h | xargs grep 'REDIS_REPLY_STRING'

#define REDIS_REPLY_STRING 1
#define REDIS_REPLY_ARRAY 2
#define REDIS_REPLY_INTEGER 3
#define REDIS_REPLY_NIL 4
#define REDIS_REPLY_STATUS 5
#define REDIS_REPLY_ERROR 6

#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <hiredis/hiredis.h>/** 请求 redis网络缓存服务器内存.*/
int main(int argc, char* argv[]) {// 忽略服务器退出,导致当前进程退出
    signal(SIGPIPE, SIG_IGN);redisContext *conn = redisConnect("127.0.0.1", 6379);if(NULL == conn) {fprintf(stderr, "redisConnect 127.0.0.1:6379 error!\n");exit(EXIT_FAILURE);}   if(conn->err) {fprintf(stderr, "redisConect error:%d\n", conn->err);redisFree(conn);exit(EXIT_FAILURE);}   // 这里redisConnect 链接对象创建完毕了freeReplyObject(redisCommand(conn, "lpush mylist foo"));freeReplyObject(redisCommand(conn, "lpush mylist bar"));redisReply *reply = redisCommand(conn, "lrange mylist 0 -1");if(reply && reply->type == REDIS_REPLY_ARRAY && reply->elements == 2) {printf("%s %s\n", reply->element[0]->str, reply->element[1]->str);}   else {printf("redisCommand [lrange mylist 0 -1] error:%d. %s\n", reply->type, reply->str);}   // 释放这个对象
    freeReplyObject(reply);// 释放hiredis 上下文对象
    redisFree(conn);return 0;
}

gcc -Wall -ggdb -o setlist.out setlist.c -lhiredis