linux c++获取当前程序的运行路径

比如我的程序名为:aaa
存放路径是:/homo/code/
我在/home/ccc 目录执行shell文件。shell文件的内容为

#!/bin/bash
/homo/code/aaa
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我希望获取的路径是 /homo/code/ 而不是脚本的路径

给出完整接口代码

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

#define MAX_PATH_LEN  256

bool getCurrRunningPath(std::string &currPath)
{
    char path[MAX_PATH_LEN] = {0};
    char *p = NULL;
    ssize_t n = readlink("/proc/self/exe", path, MAX_PATH_LEN);
    if (n > 0) {
        p = strrchr(path, '/');
        *(p + 1) = '\0'; // 去掉最后的程序名称
        currPath.assign(path);
        std::cout << "get current running path:" << path << std::endl;
        return true;
    } else {
        std::cout << "get current running path failed, errno: " << errno << std::endl;
    }

    return false;
}

int main()
{
 std::string curpath;
 getCurrRunningPath(curpath);
 std::cout << "***: " << curpath << std::endl;

 return 0;
}
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