当内核通过exec函数启动C程序时，在调用主函数前会调用特殊启动例程。可执行程序文件将此启动例程指定为程序起始地址，由C编译器调用链接编辑器设置。该启动例程从内核获取值并进行设置，以便调用主函数。
When a C program is started by the kernel(by one of the exec functuions),a speical start-up routine is called before the main function is called. The executable program file specifies this start-up routine as the starting address for the program-this is set up by the link editor when it is invoked by the C compiler,usually cc. This start-up routine takes values from the kernel(the command-line arguments and the environment)and sets things up so thar the main function is called as shown earlier.
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