swift - 将代码更新为 swift 4 会导致错误消息

Question

我想将此代码更新为 swift 4:

rc = select(socket_fd + 1, readfd, writefd, NULL, &timeout);

return rc;
  }

但是我得到两个错误:

Declaration of 'select' must be imported from module 'Darwin.POSIX.sys.time' before it is required
Implicit declaration of function 'select' is invalid in C99

我该如何解决这个问题？

Answer 1

在文件顶部附近添加:

#include <sys/time.h>