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   ttyname_r    ( 3 )

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Имя (Name)

ttyname, ttyname_r - return name of a terminal

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Синопсис (Synopsis)

#include <unistd.h>

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

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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.

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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.

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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.

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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                │
       └───────────────────────┴───────────────┴────────────────────────┘

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Стандарты (Conforming to)

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

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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.

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Смотри также (See also)

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

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