linux c 遍历目录及文件

#include <dirent.h>
void recovery_backend()
{
    DIR  * pdir ;
    struct dirent * pdirent;
    struct stat f_ftime;
    char full_path[PATH_MAX] = {0};
    char buf[PATH_MAX] = {0};
    char cmd[256] = {0};
    pdir = opendir(cups_backend);
    if(pdir == NULL)
        return ;
    for(pdirent = readdir(pdir);pdirent != NULL;pdirent = readdir(pdir))
    {
        if(strcmp(pdirent->d_name,".")==0||strcmp(pdirent->d_name,"..")==0) continue;
        memset(full_path,0,sizeof(full_path));
        snprintf(full_path,sizeof(full_path),"%s%s",cups_backend,pdirent->d_name);
        if(stat(full_path,&f_ftime) != 0)
            if(S_ISDIR(f_ftime.st_mode)) continue; /*子目录跳过*/
        if(f_ftime.st_mode & S_IFDIR) continue;
        memset(buf,0,sizeof(buf));
        readlink(full_path,buf,sizeof(buf));
        if(strcmp(full_hook_backend,buf) == 0)
        {
            remove(full_path);
            memset(cmd,0,sizeof(cmd));
            snprintf(cmd,sizeof(cmd),"cp -P %s%s %s",bk_backend,pdirent->d_name,cups_backend);
            system(cmd);
        }
    }
    closedir(pdir);
}