如何设置在C程序的命令行参数,以便当用户键入&QUOT是可见的,的ps aux"? [英] How do I set the command line arguments in a C program so that it's visible when users type "ps aux"?

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问题描述

当你输入的ps auxps命令显示程序与运行命令的参数。某些程序更改此为指示状态的一种方式。我试着改变的argv []字段,它似乎并没有工作。有没有让他们出现设置命令行参数的标准方式,当用户键入PS?

这是,这并不工作:​​

  INT主(INT ARGC,字符** argv的)
{
    的argv [0] =嗨妈妈!
    睡眠(100);
}09:40 IMAC3:〜$ ./x&安培;
[2] 96087
09:40 IMAC3:〜$ ps的UXP 96087
USER PID%CPU%MEM VSZ RSS TT STAT启动时COMMAND
yv32 96087 0.0 0.0 2426560 324 S001小号9:40 AM 0:00.00 ./x
09:40 IMAC3:〜$猫x.c


解决方案

您有正确的想法,但你没有在修改的指针的的argv [N] ,您必须更改指向的字符串的argv [0] 本身:

 的#include<&string.h中GT;
#包括LT&;&unistd.h中GT;INT主(INT ARGC,字符** argv的)
{
    为size_t MAXLEN = strlen的(的argv [0]);    memset的(argv的[0],0,maxlen的);
    strncat函数(的argv [0],妈妈你好!,MAXLEN);
    暂停();    返回0;
}

(请注意,这是否实际上改变由 PS 显示的命令名称取决于系统)。

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?

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

解决方案

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;
}

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

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