ttyname

Section: C Library Functions (3)
Updated: 2026-02-08
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名前

ttyname, ttyname_r - 端末名を返す

ライブラリ

標準 C ライブラリ (libc,~-lc)

書式

#include <unistd.h>

char *ttyname(int fd);
int ttyname_r(size_t size;
              int fd, char buf[size], size_t size);

説明

The function ttyname() returns a pointer to the null-terminated pathname of the terminal device that is open on the file descriptor fd, or NULL on error (for example, if fd is not connected to a terminal). The return value may point to static data, possibly overwritten by the next call. The function ttyname_r() stores this pathname in the buffer buf of size size.

返り値

The function ttyname() returns a pointer to a pathname on success. On error, NULL is returned, and errno is set to indicate the error. The function ttyname_r() returns 0 on success, and an error number upon error.

エラー

EBADF: ファイルディスクリプターが不正。
ENODEV: fd refers to a slave pseudoterminal device but the corresponding pathname could not be found (see NOTES).
ENOTTY: fd が端末デバイスを参照していない。
ERANGE: (ttyname_r()) size was too small to allow storing the pathname.

属性

この節で使用されている用語の説明については、 attributes(7) を参照。

インターフェース	属性	値
ttyname()	Thread safety	MT-Unsafe race:ttyname
ttyname_r()	Thread safety	MT-Safe

標準規格

POSIX.1-2008.

歴史

POSIX.1-2001, 4.2BSD.

注意

A process that keeps a file descriptor that refers to a pts(4) device open when switching to another mount namespace that uses a different /dev/ptmx instance may still accidentally find that a device path of the same name for that file descriptor exists. However, this device path refers to a different device and thus can't be used to access the device that the file descriptor refers to. Calling ttyname() or ttyname_r() on the file descriptor in the new mount namespace will cause these functions to return NULL and set errno to ENODEV.

This document was created by man2html, using the manual pages.

ttyname

名前

ライブラリ

書式

説明

返り値

エラー

属性

標準規格

歴史

注意

関連項目

Index