times(NULL) Segmentation fault-白红宇

times(NULL) Segmentation fault

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发布时间：2019-06-27

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****************************************************************************** *                   times(NULL) Segmentation fault * 说明： *     在PC机上times(NULL)是没问题的，但在嵌入式Linux上，貌似不传递参数是有可能 * 会出问题的。 * *                                         2017-7-6 深圳 龙华樟坑村 曾剑锋 *****************************************************************************/一、参考文档：    1. Segmentation fault using ctime        https://stackoverflow.com/questions/12338947/segmentation-fault-using-ctime        2. Segmentation fault on time(0);        https://stackoverflow.com/questions/1731802/segmentation-fault-on-time0    3. segmentation fault (core dumped) error when using time function        https://stackoverflow.com/questions/20939415/segmentation-fault-core-dumped-error-when-using-time-function 　　 4. An application encounters segmentation fault in glibc's times(2) function 　　　　 https://access.redhat.com/solutions/1124633 二、测试代码：    #include 
     
          #include 
      
           #include 
       
            using namespace std;    int main()    {        unsigned long SysF = sysconf(_SC_CLK_TCK);        struct tms tmp;        while(1)        {            // unsigned long tick = times(NULL);    // don't use this. it may cause segmentation fault.            unsigned long tick = times(&tmp);            unsigned long RetUl = (1000 / SysF) * tick;            cout << "tick: " << tick << " RetUl: " << RetUl << endl;            usleep(10000);        }        return 0;    }