摘要：man bash: Special Parameters The shell treats several parameters specially. These parameters may only be referenced; assignment to them is not allowed 阅读全文

摘要：http://blog.sina.com.cn/s/blog_590be5290100izdf.html 用法： #include <sys/time.h> int getitimer(int which, struct itimerval *value); int setitimer(int wh 阅读全文