http://rio.la.coocan.jp/lab/driver24/00204poll.html
AIO fallback for pipes, sockets and pollable fds [LWN.net]
WebIf nobody has the pipe open for writing, read () will always return 0 bytes and not block. If someone does have the pipe open for writing, though, blocking file descriptors will block on read (), and non-blocking ones will return immediately with EAGAIN. This is summarized in Table 2. Table 2: Reading from Empty Pipes. Web12 jul. 2012 · but again, filp->f_flags is 1. I would assume maybe 0 for O_RDONLY but not 1 which means O_WRONLY. Anyone an idea or explanation? EDIT: I also don't expect … joshleen tour tickets
Access Control on a Device File - O’Reilly Online Learning
Web8 apr. 2024 · 值得注意的是,在sock_recmsg中,有对标识O_NONBLOCK的处理. if (sock->file->f_flags & O_NONBLOCK) flags = MSG_DONTWAIT; 上述代码中sock关联的file中获取 … Web21 mrt. 2005 · 非ブロック指定されているかどうかは、chardev_read に引数として 渡される struct file 構造体へのポインタ filp を使い、f_flags メンバを調べます。 このフラグ … Webif (sock->file->f_flags & O_NONBLOCK) flags = MSG_DONTWAIT; 上述代码中sock关联的file中获取其f_flags,如果flags有O_NONBLOCK标识，那么就设置msg_flags … how to lift a boat off a trailer at home