telldir - 디렉토리 스트림의 현재 위치를 반환한다
#include <dirent.h>
long telldir(DIR *dirp);
telldir():
_XOPEN_SOURCE
|| /* glibc >= 2.19: */ _DEFAULT_SOURCE
|| /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE telldir() 함수는 디렉토리 스트림 dirp과 연관된 현재 위치를 반환한다.
On success, the telldir() function returns the current location in the directory stream. On error, -1 is returned, and errno is set to indicate the error.
- EBADF
- 무효한 디렉토리 스트림 기술자 dirp.
이 섹션에서 사용되는 용어에 대한 설명은 attributes(7)EN을 참조하십시오.
| 상호 작용 | 속성 | 번호 |
| telldir() | Thread safety | MT-Safe |
POSIX.1-2001, POSIX.1-2008, 4.3BSD.
Up to glibc 2.1.1, the return type of telldir() was off_t. POSIX.1-2001 specifies long, and this is the type used since glibc 2.1.2.
In early filesystems, the value returned by telldir() was a simple file offset within a directory. Modern filesystems use tree or hash structures, rather than flat tables, to represent directories. On such filesystems, the value returned by telldir() (and used internally by readdir(3)EN) is a "cookie" that is used by the implementation to derive a position within a directory. Application programs should treat this strictly as an opaque value, making no assumptions about its contents.