linux如何用pid获取进程参数？

When I execute the program ./test -debug 7 -m player,I use C language how to get the parameter values of -m -debug?

当我执行程序./test -debug 7 -m player时，我使用C语言如何获取-m -debug的参数值？

I have tried:

我努力了：

char* name = (char*)calloc(1024,sizeof(char));
if(name){
    sprintf(name, "/proc/%d/cmdline",pid);
    FILE* f = fopen(name,"r");
    if(f){
        size_t size;
        size = fread(name, sizeof(char), 1024, f);
        if(size>0){
            if('\n'==name[size-1])
                name[size-1]='\0';
        }
        fclose(f);
    }
}

But it only returns the name of the process.exec "xargs -0 < /proc/pid/cmdline" can return the right value(mytest -debug 7 -m player),I want to get in another process, rather than in the main method of the process.such as,in process mytest2,I want to get mytest process debug value with pid(via pid = getpid() and via pid get mytest process info,and than get debug value ).

但它只返回process.exec的名称“xargs -0

1 个解决方案

#1

From proc(5):

来自proc（5）：

The command-line arguments appear in this file as a set of strings separated by null bytes ('\0'), with a further null byte after the last string.

命令行参数在此文件中显示为由空字节（'\ 0'）分隔的一组字符串，在最后一个字符串后面还有一个空字节。

So, this code should work:

所以，这段代码应该工作：

for (i = 0; i < size; i++) {
    if (!i)
        printf("%s\n", name);
    else if (!name[i - 1])
        printf("%s\n", name + i);
}