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int pselect(
    int nfds, 
    fd_set *readfds, 
    fd_set *writefds,
    fd_set *exceptfds, 
    const struct timespec *timeout,
    const sigset_t *sigmask);

struct timespec {
        time_t   tv_sec;        /* seconds */
        long     tv_nsec;       /* nanoseconds */
};

与 select 区别

• timeout
  • select
    • timeval
      • seconds
      • milliseconds
    • 会为指示剩余时间而更新 timeout
  • pselect
    • timespec
      • seconds
      • nanoseconds
    • 不会更新 timeout
• sigmask
  • sigmask == null ?
    • pselect 行为同 select

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