c - linux如何使用pid获取进程参数？

Question

我用C语言执行程序./test -debug 7 -m player时，如何获取-m -debug的参数值？

我试过:

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);
    }
}

但它只返回进程的名称。exec "xargs -0

Answer 1

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.

所以，这段代码应该可以工作:

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