嵌入式

times(NULL) Segmentation fault

2019-07-12 19:48发布

站内文章 / 嵌入式Linux
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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; }  

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