linux C++ 获取文件绝对路径的实例代码

#include <stdlib.h>
#include <stdio.h>
#include <limits.h>

int main(){
 const char *file_name = "filename";
 char abs_path_buff[PATH_MAX];

 //获取文件路径,填充到abs_path_buff
 //realpath函数返回: null表示获取失败; 否则返回指向abs_path_buff的指针
 if(realpath(file_name,abs_path_buff)){
  printf("%s %sn",file_name,abs_path_buff);
 }
 else{
  printf("the file '%s' is not existn",file_name); 
 }

 return 0;
}