Example: Probe at exit of read system call all processes.
示例：读取系统调用所有进程的出口的探针。
All the read system calls eventually call soreceive .
所有的read系统调用最终调用soreceive 。
The asterisk indicates that the read system call for all processes are to be probed.
星号表示所有进程的read系统调用都应该探测。
Step one: the read system call causes a context switch from user mode to kernel mode.
read() 调用（参见 图 2）引发了一次从用户模式到内核模式的上下文切换。
Step two: data is copied from the kernel buffer into the user buffer, and the read system call returns.
所需的数据被从读取缓冲区拷贝到用户缓冲区，read()调用返回。
Step two: data is copied from the kernel buffer into the user buffer, and the read system call returns. The return from the call caused a context switch from kernel back to user mode.
步骤二：数据从内核空间缓冲区复制到用户空间缓冲区，之后系统调用read返回，这导致了从内核空间向用户空间的上下文切换。
This command USES the klogctl system call to read the kernel ring buffer and emit it to standard output (stdout).
这个命令使用klogctl系统调用来读取内核环缓冲区，并将它转发到标准输出(stdout)。
From the system call count, there were several calls to read, write, close, and stat that didn't appear before.
从系统调用计数中可以看出，有一些以前没有出现过的调用，包括read、write、close和stat。
Read event occurrence data through a read() system call.
通过read()系统调用读取事件发生数据。
At the top of the kernel is the system call interface, which handles the routing of user-space calls to their appropriate destination in the kernel (such as an open, read, or write).
内核的顶部是系统调用接口，处理用户空间调用到内核中合适的目的地的路由(例如open、read或write)。
At the top is the system call interface, which implements the basic functions such as read and write.
最上面是系统调用接口，它实现了一些基本的功能，例如read和write。
Wait on event occurrences with the select() (or a blocking read()) system call.
使用select()（或阻塞的read()）系统调用等待事件发生。
The inode refers to the file operations that are possible on it, most of which map directly to the system-call interfaces (for example, open, read, write, and flush).
inode引用它所允许的文件操作，大部分这些操作直接映射到系统调用接口(例如，open、read、write和flush)。
Now, to free up the blocked thread, I would somehow need to cancel the system read call.
现在，释放被阻塞的线程，我会需要取消系统读取电话。
Now, to free up the blocked thread, I would somehow need to cancel the system read call.
现在，释放被阻塞的线程，我会需要取消系统读取电话。
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