奇怪的错误（解除指向不完整类型的指针） [英] Strange error(dereferencing pointer to incomplete type)

问题描述

  void get_cwd（char * buf）
 {
 char * result; 
 
 current-> fs-> pwd; 
 result = get_dentry_path（current-> fs-> pwd）; 
 
 memcpy（buf，result，strlen（result）+1）; 
 
 kfree（result）; 
} 
  

错误：解除指向不完整类型的指针

错误指向current-> fs-> pwd;

包括：

  #include< asm / stat.h> 
 #include< linux / fs.h> 
 #include< linux / file.h> 
 #include< linux / module.h> 
 #include< linux / kernel.h> 
 #include< linux / string.h> 
 #include< linux / dirent.h> 
 #include< linux / sched.h> 
 #include< asm / uaccess.h> 
 #include< asm / current.h> 
 #include< linux / path.h> 
  

如果我输入current-> fs;在第5行gcc不要给这行错误。问题出在 pwd 字段。

解决方案

陈旧，但我又碰到同样的问题，试图在内核v2.6.33中实现 getcwd 。由于这是在搜索取消引用指向不完整类型current-> fs时出现的最相关结果，因此最好有解决方案以供将来参考。

<解决方案是包含这两个头文件：

  #include< linux / sched.h> 
 #include< linux / fs_struct.h> 
  

void get_cwd(char* buf)
{
    char *result;

  current->fs->pwd;
    result = get_dentry_path(current->fs->pwd);

    memcpy(buf, result, strlen(result)+1);

    kfree(result);
}

error: dereferencing pointer to incomplete type

The error points to current->fs->pwd;

includes:

#include <asm/stat.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/dirent.h>
#include <linux/sched.h>
#include <asm/uaccess.h>
#include <asm/current.h>
#include <linux/path.h>

If I type current->fs; on 5th line gcc don't give error on this line. The problem is with pwd field.

解决方案

This question is kind of stale but I ran into the same issue again trying to implement getcwd in kernel v2.6.33. Since this is the most relevant result that comes up when searched for "dereferencing pointer to incomplete type current->fs", it would be good to have the solution for future reference.

The solution is to include both of these headers:

#include <linux/sched.h>
#include <linux/fs_struct.h>

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