Linux C + + gets file absolute path

The FTP service needs to get the absolute path of the file, here is a record.

1#include <stdlib.h>2#include <stdio.h>3#include <limits.h>4 5 intMain () {6     Const Char*file_name ="filename";7     CharAbs_path_buff[path_max];8 9     //get file path, populate to Abs_path_buffTen     //the Realpath function returns: null indicates that the acquisition failed; otherwise a pointer to Abs_path_buff is returned One     if(Realpath (file_name, Abs_path_buff)) { Aprintf"%s%s\n", file_name, abs_path_buff); -     } -     Else{ theprintf"The file '%s ' is not exist\n", file_name);  -     } -  -     return 0; +}

Linux C + + gets file absolute path