epoll 文件描述符操作
我正在尝试了解 Linux 中的 epoll。
正常操作似乎是：
// Create the epoll_fd
int epoll_fd = epoll_create(10);
...
// Add file descriptors to it
struct epoll_event ev = {0};
ev.events |= EPOLLIN;
ev.data.ptr = ...;
/* for brevity, I don't do error checking here */
epoll_ctl(epoll_fd, EPOLL_CTL_ADD, some_fd, &ev);
...
// Wait for IO events
struct epoll_event events[10];
int num_events = epoll_wait(epoll_fd, events, 10, -1);
// Now handle the events
...
我的问题是这样的：鉴于 epoll_fd 似乎是常规文件描述符，除了三个 epoll 函数调用之外，我还可以用它执行其他文件操作吗？
I'm trying to wrap my head around epoll in Linux.
The normal operation seems to be:
// Create the epoll_fd
int epoll_fd = epoll_create(10);
...
// Add file descriptors to it
struct epoll_event ev = {0};
ev.events |= EPOLLIN;
ev.data.ptr = ...;
/* for brevity, I don't do error checking here */
epoll_ctl(epoll_fd, EPOLL_CTL_ADD, some_fd, &ev);
...
// Wait for IO events
struct epoll_event events[10];
int num_events = epoll_wait(epoll_fd, events, 10, -1);
// Now handle the events
...
My question is this: given the epoll_fd seems to be a regular file descriptor, are there any other file operations that I can do with it, besides the three epoll function calls?
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从 手册页：
From the man page:
您可以
poll(2)您的epoll_fd本身:)You can
poll(2)yourepoll_fditself :)