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当我释放内存时,它导致glibc检测到错误。 当我给(当前目录包含单个文件作为输入)时它工作正常。 但是(父目录)输入给出了这个错误。我试图用gdb没有成功。 有人可以指出问题。谢谢。 以下是代码。*** glibc检测到*** outfile:free():无效指针:***
/*
*********************************************************************
*File Name - function.c
Purpose - Implementation of functions like iteration, open_read to
printf directories and file properties.
**********************************************************************
*/
#include "header.h"
gboolean iterator(GNode* _node, gpointer data)
{
guint _node_depth = g_node_depth(_node);
printf("%p insert _ \t%p data\n",_node,_node->data);
if(_node_depth>1)
{
printf("%.*s",(_node_depth-2)*2," ");
printf("%s\n",(char *)_node->data);
}
return SUCCESS;
}
gboolean destroyer(GNode* node, gpointer data)
{
printf("\nfrom destroyer: ");
printf("%pnode\t data %p\n",node,node->data);
free(node->data);
return SUCCESS;
}
void open_read(char* input_dir ,GNode* parent)
{
int count = 0;
DIR *dir;
struct dirent *dp;
char *stat_path = NULL;
struct stat file_stat;
char *data = NULL;
char *formatted_data = NULL;
if(NULL == (dir = opendir(input_dir)))
{
printf("cannot open %s directory",input_dir);
}
else
{
/* Loop through directory entries. */
while((dp = readdir(dir)) != NULL)
{
if(count >= 2) /* omitting '.' and '..' files */
{
if(dp->d_type == DT_REG)
{
/* Get entry's information. */
stat_path = (char *)malloc(sizeof(char) * MAX_SIZE);
strcpy(stat_path, input_dir);
strcat(stat_path, dp->d_name);
if (stat(stat_path, &file_stat) == -1)
{
printf("cant read the stats of %s",dp->d_name);
}
else
{
data=(char*)malloc(sizeof(char) * MAX_SIZE);
strcpy(data,dp->d_name);
strcat(data,"\n\tLinks\tUid\ti_node\tSize\tPath\n");
formatted_data=(char*)malloc(sizeof(char) * MAX_SIZE);
sprintf(formatted_data,"\t%d\t%d\t%d\t%d\t%s", (int)file_stat.st_nlink, (int)file_stat.st_uid, (int)file_stat.st_ino, (int)file_stat.st_size,input_dir);
strcat(data,formatted_data);
//free(formatted_data);
g_node_insert(parent,-1,g_node_new(data));
}
free(stat_path);
}
else if(dp->d_type == DT_DIR)
{
char *sub_dir = (char *)malloc(sizeof(char) * MAX_SIZE);
strcpy(sub_dir, input_dir);
strcat(sub_dir, dp->d_name);
strcat(sub_dir, "/");
open_read(sub_dir, g_node_insert(parent,-1,g_node_new(dp->d_name)));
}
}
count++;
}
}
closedir(dir);
}
/**********************************************************************
Purpose - Simulating the LS command
Input - directory path from the command line
Output - Displaying the list of directories and file properties
return - SUCCESS OR FAILURE
***********************************************************************/
#include "header.h"
int main(int argc, char* argv[])
{
char *user_dir = NULL;
/*allocating memory*/
user_dir = (char*)malloc(sizeof(char) * MAX_SIZE);
if (NULL == user_dir)
{
fprintf(stderr, "cant allocate memory...");
return FAILURE;
}
/*opening and reading the directory by calling open_read()*/
if (argc < 2)
{
strcpy(user_dir,"./");
}
else
{
strcpy(user_dir, argv[1]);
strcat(user_dir, "/");
}
GNode * root = g_node_new(user_dir);
//g_node_insert(root);
open_read(user_dir, root);
g_node_traverse(root, G_PRE_ORDER, G_TRAVERSE_ALL, -1, (GNodeTraverseFunc)iterator, NULL);
//printf("from main():%s",root->data);
g_node_traverse(root, G_PRE_ORDER, G_TRAVERSE_ALL, -1, (GNodeTraverseFunc)destroyer, NULL);
g_node_destroy(root);
return SUCCESS;
}
欢迎堆栈溢出! [请参阅此讨论,为什么不在'C'中投射'malloc()'和family的返回值。](http://stackoverflow.com/q/605845/2173917)。 –
关于这一行:'if(count> = 2)'代码中没有任何内容将count设置为0,但是初始值为0.代码缺少语句来检查当前目录名以确保它是不是''也不'''。建议使用strcmp()函数对目录名称“dp-> d_name”进行适当检查来替换“if(count> = 2)”。 – user3629249
所有文件系统类型都不支持d_type字段。建议使用'stat()'并查看'st_mode'字段,使用如下所示的宏:'S_ISREG(m)'来确定文件是否为'常规'文件 – user3629249