如何在 C 程序中设置命令行参数，以便在用户键入“ps aux"时可见? [英] How do I set the command line arguments in a C program so that it's visible when users type "ps aux"?

问题描述

当您键入ps aux"时，ps 命令会显示程序运行时使用的命令参数.一些程序将其更改为指示状态的一种方式.我试过更改 argv[] 字段，但它似乎不起作用.是否有一种标准方法可以设置命令行参数，以便在用户键入 ps 时显示它们?

When you type "ps aux" the ps command shows command arguments that the program was run with. Some programs change this as a way of indicating status. I've tried changing argv[] fields and it doesn't seem to work. Is there a standard way to set the command line arguments so that they appear when the user types ps?

也就是说，这不起作用:

That is, this doesn't work:

int main(int argc,char **argv)
{
    argv[0] = "Hi Mom!";
    sleep(100);
}

09:40 imac3:~$ ./x &
[2] 96087
09:40 imac3:~$ ps uxp 96087 
USER      PID  %CPU %MEM      VSZ    RSS   TT  STAT STARTED      TIME COMMAND
yv32      96087   0.0  0.0  2426560    324 s001  S     9:40AM   0:00.00 ./x
09:40 imac3:~$ cat x.c

推荐答案

你的想法是对的，但你没有改变 argv[n] 中的 指针，你必须改变argv[0]本身指向的字符串:

You had the right idea, but you don't change the pointers in argv[n], you must change the string pointed to by argv[0] itself:

#include <string.h>
#include <unistd.h>

int main(int argc,char **argv)
{
    size_t maxlen = strlen(argv[0]);

    memset(argv[0], 0, maxlen);
    strncat(argv[0], "Hi Mom!", maxlen);
    pause();

    return 0;
}

(注意这是否真的改变了ps显示的命令名称是系统相关的).

(Note that whether or not this actually changes the command name shown by ps is system-dependent).

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