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yuesong-feng avatar yuesong-feng commented on May 18, 2024

close(fd)返回-1有以下几种情况,可以根据errno来判断:
EBADF:fd不是一个有效的、开启的文件描述符
EINTR:close()被一个信号中断了
EIO:发生了一个IO错误
ENOSPC, EDQUOT:在NFS文件系统中,第一次写入超过了可用的存储空间大小并不会发生,但后续的write()、fsync()或close()会发生。

绝大部分情况应该是EBADF,当你close(fd)的时候,它已经是一个失效的fd了。
这可能是fd在之前某个时候从epoll上被移除,因为从epoll上移除会自动调用close()来关闭文件描述符。

epoll add error: bad file descriptor和close没有关系,close掉的fd不会被加入到epoll,可能是加入的fd已经被关闭、或者是一个无效fd。

from 30daymakecppserver.

yeinan avatar yeinan commented on May 18, 2024

from 30daymakecppserver.

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