针对这个新函数更新系统调用表。

Update the system call table for the new function.

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这个系统调用返回一个文件描述符。

This system call returns a file descriptor.

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使用新的内核系统调用有两种方法。

There are two ways that you can use new kernel system calls.

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在本文中，将学习以下系统调用。

In this article, learn about the following system calls.

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为此它使用了系统调用fork 。

For that purpose it USES the system call fork .

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内存和用户数量对系统调用的影响

System Calls by Memory and Number of Users chart

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这就是第3个步骤，更新系统调用表。

This is step 3, updating the system call table.

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SCI的核心是系统调用多路分解表。

At the core of the SCI is the system call demultiplexing table.

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在bind系统调用函数中。

In the bind system call function.

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因此，系统调用被命名为fork 。

Hence, the system call is named fork .

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本文仅讨论sendmsg系统调用。

This article discusses only the sendmsg system call.

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retval是系统调用的返回值。

retval is the return value of the system call.

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您还需要考虑系统调用跟踪本身的开销。

You must also consider the overhead of system call tracing.

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系统调用接口可以从两个角度进行描述。

The system call interface can be described from two perspectives.

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exec系列系统调用运行实际的程序。

The exec family of system calls runs the actual program.

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清单1.madvise系统调用。

Listing 1. The madvise system call.

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当前，对于系统调用，只支持出口探查点。

Currently, the exit probe point is supported for system calls only.

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清单3. sendfile系统调用。

Listing 3. The sendfile system call.

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示例：读取系统调用所有进程的出口的探针。

Example: Probe at exit of read system call all processes.

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fork(2)系统调用创建一个新进程。

The fork(2) system call creates a new process.

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系统调用与库函数比较—以及一点历史知识。

System calls vs. library functions — and a bit of history.

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在下面将看到系统调用的代码，它有四个参数。

Here you can see the code for the system call, with four parameters.

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chroot系统调用有很多问题，如前所述。

The system call chroot has a number of problems, as noted above.

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系统调用入口/出口探针（或syscall）

System Call Entry/Exit probes (or syscall)

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这个系统调用向指定设备发送控制代码和其他数据。

This system call sends control code and other data to a specified device.

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清单1所示的前两个函数，是系统调用的简单示例。

The first two functions, shown in Listing 1, are simple examples of a system call.

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通过read()系统调用读取事件发生数据。

Read event occurrence data through a read() system call.

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如果是Linux，你必须熟悉unix系统调用。

If it is Linux, you must know UNIX system calls.

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向内核中添加新系统调用，需要执行3 个基本步骤

You perform three basic steps to add a new system call to the kernel

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向内核中添加新系统调用，需要执行3 个基本步骤

You perform three basic steps to add a new system call to the kernel

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