Note that the child process never returns from the call to execv.
请注意，该子进程一直没有从execv调用返回。
When this new process-the child process-is executing, the parent process will still be running.
当这个新进程(子进程)正在执行时，父进程仍然在运行。
The function returns an integer, which represents the exit code for the child process.
这个函数返回一个整数，代表子进程的退出码。
The function returns an integer, which represents the exit code for the child process.
这个函数返回一个整数，代表子进程的退出码。
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