Shared memory - shmget filling holes

shmget设置的size值,不能大于最大值SHMMAXand is less than the minimum valueSHMMIN
且若是keyThe segment corresponding to the value already exists,Then use it latershmget的sizeThe value must be less than or equal to the original value function

Then I asked the programmer,He set20kB,个人是100kB,And his settings are to start at boot,So it was me who made the mistake every time,悲催！

/******************************************************************************
*函数名称:yg_init_mem_share
*功能描述: 初始化共享内存(Used to store map calibration data)
*全局影响:无
*输入:
*输出:无
*返回值:0:成功      -1：发送失败
* 做者        日期          内容
* Jimmy     2018-10-16  建立
*
******************************************************************************/
void yg_init_mem_share(int size)
{
    key_t key;
    //int size = 1024*1024; //1M内存大小
    
    //1. 建立共享内存
    if(-1 == (key = ftok("/", 4)))
    {
        bv_loge("ftok failed [%d:%s]!", errno, strerror(errno));
        bv_error_handle("ftok failed [%d:%s]!", errno, strerror(errno));
        return ;
    }
    
    bv_logd("key=%#x!", key);
    
    SHM_ID = shmget(key, (size_t)size, IPC_CREAT|0644);

    if(-1 == SHM_ID)
    {
        bv_loge("Init the shared memory[%dKB] failed [%d:%s]!",size/1024, errno, strerror(errno));
        bv_error_handle("Init the shared memory[%dKB] failed [%d:%s]!",size/1024, errno, strerror(errno));
    }
    else
    {
        bv_logd("Init the shared memory[%dKB] OK!", size/1000);
        bv_file_log(g_tcp_fp, "Init the shared memory[%dKB] OK!", size/1000);
    }
    
    return ;
}

The above is copied from others,意思就是说,你先创建了一个KEY对应的文件,比如说是K1,现在程序运行时K1对应的内存SIZE是1000字节,Later you want to expand this memory,Modify the allocated memory directly,最大还是1000字节,只有删掉K1对应的文件,Recreate and allocate larger memory,才能满足.

共享内存 - shmget填坑记 - JavaShuo