在C中读取目录的问题

Question

我正在编写一个简单的C程序,它接收一个目录作为参数,并显示该目录中的文件以及他的子目录.为此我写了一个"递归"函数.但由于一个未知的原因,我的程序在该stat功能失败.这是我的计划:

    #define _POSIX_SOURCE 1

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <dirent.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>


void display_directory(char* path){

  DIR* directory = opendir(path);
  if( directory == NULL){
    printf("opendir failure for %s\n", path);
    exit(1);
  }


 struct dirent* dirent;
 struct stat stat_info;

 while((dirent = readdir(directory)) != NULL){
   printf("[%s]\n", dirent->d_name);
   if(stat(dirent -> d_name, &stat_info) == -1){
     printf("readdir error for %s\n", dirent->d_name);
     exit(1);
   }
   if(S_ISREG(stat_info.st_mode)){
       printf("File: %s \n", dirent -> d_name); 
   }
   if(S_ISDIR(stat_info.st_mode)){
     if(strncmp(dirent->d_name, "..",2)){
       printf("Directory : %s\n", dirent->d_name);
       display_directory(dirent->d_name);
     }  
    }

 }

 closedir(directory);
}

int main(int argc, char* argv[]){

char* path;

if(argc > 1){
 path = argv[1];
} else {
 path = ".";
}

display_directory(path);

 return EXIT_SUCCESS;
}

例如,如果在我的目录A中,我有a1,a2,a3和..,它首先读取..目录,当它读取目录a1时,该stat函数失败.

有人可以告诉我我的代码不正确.

[编辑]我包括<errno.h>你们许多建议,并在运行程序后,我有错误Too many open files.

    #define _POSIX_SOURCE 1

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <dirent.h>
#include <string.h>
#include <errno.h>
#include <sys/stat.h>
#include <sys/types.h>


void display_directory(char* path){

  DIR* directory = opendir(path);
  if( directory == NULL){
    printf("opendir failure for %s --> %s\n", path, strerror(errno));
    exit(1);
  }


 struct dirent* dirent;
 struct stat stat_info;

 while((dirent = readdir(directory)) != NULL){
   printf("[%s]\n", dirent->d_name);
   if(stat(dirent->d_name, &stat_info)){
     printf("readdir error for %s ---> %s\n", dirent->d_name, strerror(errno));
     continue;
   }
   if(S_ISREG(stat_info.st_mode)){
       printf("Fichier : %s \n", dirent->d_name); 
   }
   if(S_ISDIR(stat_info.st_mode)){
     if(strncmp(dirent->d_name, "..",2)){
       printf("Directory : %s\n", dirent->d_name);
       display_directory(dirent->d_name);
     }  
    }

 }

 closedir(directory);
}

int main(int argc, char* argv[]){

char* path;

if (argc > 2) { 
 fprintf(stderr, "Usage: %s [directory]\n", argv[0]); 
 exit(1); 
}

path = argv[1];


display_directory(path);

 return EXIT_SUCCESS;
}

该计划的输出:

[..]
[mykill.c]
readdir error for mykill.c ---> No such file or directory
[.]
Directory : .
[..]
[.]
Directory : .
[..]
[.]
Directory : .
[..]

...
...
Directory : .
opendir failure for . --> Too many open files

mykill.c是作为参数传递的目录中的文件.

Answer 1

我非常清楚错误,但我想先告诉你如何为自己调试这个问题.更改此代码...

if(stat(dirent -> d_name, &stat_info) == -1){
  printf("readdir error for %s\n", dirent->d_name);
  exit(1);
}

......改为阅读......

if (stat(dirent->d_name, &stat_info)) {
    printf("%s: %s\n", dirent->d_name, strerror(errno));
    continue;
}

您需要添加到包含列表

#include <errno.h>

再次运行该程序.如果你没有从输出中看到问题是什么,那么在你的问题中编辑COMPLETE,UNEDITED输出,我们将从那里开始.