可以从套接字 return EWOULDBLOCK 读取（）吗？
Can read() from socket return EWOULDBLOCK?
我的代码使用 epoll 进行多路复用。遇到 EPOLLIN 后，它从就绪套接字中读取一个字节。
read(fd, &onebyte, 1);
上面那行可以returnEWOULDBLOCK吗?
是的，
Errors:
...
EAGAIN or EWOULDBLOCK
The file descriptor fd refers to a socket and has been marked
nonblocking (O_NONBLOCK), and the read would block. POSIX.1-2001
allows either error to be returned for this case, and does not require
these constants to have the same value, so a portable application
should check for both possibilities
我的代码使用 epoll 进行多路复用。遇到 EPOLLIN 后，它从就绪套接字中读取一个字节。
read(fd, &onebyte, 1);
上面那行可以returnEWOULDBLOCK吗?
是的，
Errors:
...
EAGAIN or EWOULDBLOCK
The file descriptor fd refers to a socket and has been marked nonblocking (O_NONBLOCK), and the read would block. POSIX.1-2001 allows either error to be returned for this case, and does not require these constants to have the same value, so a portable application should check for both possibilities