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   ttyname_r    ( 3 )

вернуть имя терминала (return name of a terminal)

Имя (Name)

ttyname, ttyname_r - return name of a terminal


Синопсис (Synopsis)

#include <unistd.h>

char *ttyname(int fd); int ttyname_r(int fd, char *buf, size_t buflen);


Описание (Description)

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 length buflen.


Возвращаемое значение (Return value)

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.


Ошибки (Error)

EBADF Bad file descriptor.

ENODEV fd refers to a slave pseudoterminal device but the corresponding pathname could not be found (see NOTES).

ENOTTY fd does not refer to a terminal device.

ERANGE (ttyname_r()) buflen was too small to allow storing the pathname.


Атрибуты (Attributes)

For an explanation of the terms used in this section, see attributes(7).

┌───────────────────────┬───────────────┬────────────────────────┐ │Interface Attribute Value │ ├───────────────────────┼───────────────┼────────────────────────┤ │ttyname() │ Thread safety │ MT-Unsafe race:ttyname │ ├───────────────────────┼───────────────┼────────────────────────┤ │ttyname_r() │ Thread safety │ MT-Safe │ └───────────────────────┴───────────────┴────────────────────────┘


Стандарты (Conforming to)

POSIX.1-2001, POSIX.1-2008, 4.2BSD.


Примечание (Note)

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.


Смотри также (See also)

tty(1), fstat(2), ctermid(3), isatty(3), pts(4)