Linux C/C++编程：使用libuv获取当前进程的执行路径

秒速五厘米 2023-01-03 14:25 120阅读 0赞

> 准备： [https://blog.csdn.net/zhizhengguan/article/details/111678847][https_blog.csdn.net_zhizhengguan_article_details_111678847]

![在这里插入图片描述][20201225145423548.png]

cmake_minimum_required(VERSION 3.16)
    project(libuv_test C)
    
    set(CMAKE_C_STANDARD 99)
    link_directories(usr/local/lib)
    include_directories(usr/local/include)
    
    add_executable(${
        PROJECT_NAME}  main.c)
    
    target_link_libraries (${
        PROJECT_NAME} -luv )   #libuv.a

#include <unistd.h>
    #include <stdio.h>
    #include <pwd.h>
    #include <uv.h>
    
    
    char exepath[FILENAME_MAX + 1];
    
    void get_netdata_execution_path(void)
    {
        
        int ret;
        size_t exepath_size = 0;
        struct passwd *passwd = NULL;
        char *user = NULL;
    
        passwd = getpwuid(getuid());
        user = (passwd && passwd->pw_name) ? passwd->pw_name : "";
    
        exepath_size = sizeof(exepath) - 1;
        ret = uv_exepath(exepath, &exepath_size);
        if (0 != ret) {
        
            printf("[error]: \t\tuv_exepath(\"%s\", %u) (user: %s) failed (%s).", exepath, (unsigned)exepath_size, user,
                  uv_strerror(ret));
            printf("[fatal]: \t\tCannot start netdata without getting execution path.");
        }
        exepath[exepath_size] = '\0';
    }
    
    int main()
    {
        
        get_netdata_execution_path();
        printf("%s", exepath);
    }

![在这里插入图片描述][2021010721535099.png]

# 理论 #

## 错误处理 ##

*  初始化函数或者同步执行的函数，会在执行失败后返回代表错误的负数。
 *  对于异步执行的函数，会在执行失败的时候，给它们的回调函数传递一个状态参数。错误信息被定义为[UV\_E\* 常量][UV_E_]， 你可以使用`uv_strerror(int)`和`uv_err_name(int)`分别获取const char \*格式的错误信息和错误名字。

[https_blog.csdn.net_zhizhengguan_article_details_111678847]: https://blog.csdn.net/zhizhengguan/article/details/111678847
[20201225145423548.png]: /images/20221119/bc86e4f84d854c36a565701d78628ccd.png
[2021010721535099.png]: /images/20221119/f1080a1cf4614a4cb900b73367f16d4c.png
[UV_E_]: http://docs.libuv.org/en/v1.x/errors.html#error-constants