gistfile1.c

int redisContextConnectTcp(redisContext *c, const char *addr, int port, struct timeval *timeout) {
    int s, rv;
    char _port[6];  /* strlen("65535"); */
    struct addrinfo hints, *servinfo, *p;
    int blocking = (c->flags & REDIS_BLOCK);

    snprintf(_port, 6, "%d", port);
    memset(&hints,0,sizeof(hints));
    hints.ai_family = AF_INET;
    hints.ai_socktype = SOCK_STREAM;

    if ((rv = getaddrinfo(addr,_port,&hints,&servinfo)) != 0) {
        __redisSetError(c,REDIS_ERR_OTHER,gai_strerror(rv));
        return REDIS_ERR;
    }
    for (p = servinfo; p != NULL; p = p->ai_next) {
        if ((s = socket(p->ai_family,p->ai_socktype,p->ai_protocol)) == -1)
            continue;

        if (redisSetBlocking(c,s,0) != REDIS_OK)
            goto error;
        if (connect(s,p->ai_addr,p->ai_addrlen) == -1) {
            if (errno == EHOSTUNREACH) {
                close(s);
                continue;
            } else if (errno == EINPROGRESS && !blocking) {
                /* This is ok. */
            } else {
                if (redisContextWaitReady(c,s,timeout) != REDIS_OK)
                    goto error;
            }
        }
        if (blocking && redisSetBlocking(c,s,1) != REDIS_OK)
            goto error;
        if (redisSetTcpNoDelay(c,s) != REDIS_OK)
            goto error;

        c->fd = s;
        c->flags |= REDIS_CONNECTED;
        rv = REDIS_OK;
        goto end;
    }
    if (p == NULL) {
        char buf[128];
        snprintf(buf,sizeof(buf),"Can't create socket: %s",strerror(errno));
        __redisSetError(c,REDIS_ERR_OTHER,buf);
        goto error;
    }

error:
    rv = REDIS_ERR;
end:
    freeaddrinfo(servinfo);
    return rv;  // Need to return REDIS_OK if alright
}