函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\printk\printk.c Create Date:2022-07-27 11:06:07
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：devkmsg_poll

函数原型：static __poll_t devkmsg_poll(struct file *file, poll_table *wait)

返回类型：__poll_t

参数：

类型参数名称
struct file *file
poll_table *wait
974  user等于 needed for tty driver, and maybe others
975  ret等于0
977  如果非user则返回:EPOLLERR按位或EPOLLNVAL
980  poll_wait(file, & log_wait, wait)
982  Helper macros to lock/unlock logbuf_lock and switch between* printk-safe/unsafe modes.()
983  如果seq小于dex and sequence number of the next record to store in the buffer 则
985  如果seq小于dex and sequence number of the first record stored in the buffer 则ret等于Epoll event masks 按位或EPOLLRDNORM按位或EPOLLERR按位或EPOLLPRI
987  否则ret等于Epoll event masks 按位或EPOLLRDNORM
990  logbuf_unlock_irq()
992  返回:ret