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                ## telldir ## 取得目錄流的讀取位置 ### 相關函數 ### open,opendir,closedir,rewinddir,seekdir,readdir,scandir ### 表頭文件 ### ``` #include<dirent.h> ``` ### 定義函數 ### ``` off_t telldir(DIR *dir); ``` ### 函數說明 ### telldir()返回參數dir目錄流目前的讀取位置。此返回值代表距離目錄文件開頭的偏移量返回值返回下個讀取位置,有錯誤發生時返回-1。 ### 錯誤代碼 ### EBADF參數dir為無效的目錄流。 ### 范例 ### ``` #include<sys/types.h> #include<dirent.h> #include<unistd.h> main() { DIR *dir; struct dirent *ptr; int offset; dir = opendir(“/etc/rc.d”); while((ptr = readdir(dir))!=NULL) { offset = telldir (dir); printf(“d_name : %s offset :%d\n”, ptr->d_name,offset); } closedir(dir); } ``` ### 執行 ### ``` d_name : . offset :12 d_name : .. offset:24 d_name : init.d offset 40 d_name : rc0.d offset :56 d_name :rc1.d offset :72 d_name:rc2.d offset :88 d_name:rc3.d offset 104 d_name:rc4.d offset:120 d_name:rc5.d offset:136 d_name:rc6.d offset:152 d_name:rc offset 164 d_name:rc.local offset :180 d_name:rc.sysinit offset :4096 ```
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