C - select() - 如何正确更新计时器

Question

Linux 手册指出:

The operation of select() and pselect() is identical, other than these
       three differences:

       (i)    ...

       (ii)   select() may update the timeout argument to indicate how much time
              was left.  pselect() does not change this argument.
       (iii)  ...

它说你可以更新它，但我该怎么做呢？我再次使用相同的参数调用 select() ？

Answer 1

It says that you can update it but how can i do that

它说没有这样的事情。它说该函数可以修改它。 The standard短语略有不同:

Upon successful completion, the select() function may modify the object pointed to by the timeout argument.