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   ttyname_r.3p    ( 3 )

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Пролог (Prolog)

This manual page is part of the POSIX Programmer's Manual.  The
       Linux implementation of this interface may differ (consult the
       corresponding Linux manual page for details of Linux behavior),
       or the interface may not be implemented on Linux.

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Имя (Name)

ttyname, ttyname_r — find the pathname of a terminal

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Синопсис (Synopsis)

#include <unistd.h>

       char *ttyname(int fildes);
       int ttyname_r(int fildes, char *name, size_t namesize);

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Описание (Description)

The ttyname() function shall return a pointer to a string
       containing a null-terminated pathname of the terminal associated
       with file descriptor fildes.  The application shall not modify
       the string returned. The returned pointer might be invalidated or
       the string content might be overwritten by a subsequent call to
       ttyname().  The returned pointer and the string content might
       also be invalidated if the calling thread is terminated.

       The ttyname() function need not be thread-safe.

       The ttyname_r() function shall store the null-terminated pathname
       of the terminal associated with the file descriptor fildes in the
       character array referenced by name.  The array is namesize
       characters long and should have space for the name and the
       terminating null character. The maximum length of the terminal
       name shall be {TTY_NAME_MAX}.

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Возвращаемое значение (Return value)

Upon successful completion, ttyname() shall return a pointer to a
       string. Otherwise, a null pointer shall be returned and errno set
       to indicate the error.

       If successful, the ttyname_r() function shall return zero.
       Otherwise, an error number shall be returned to indicate the
       error.

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Ошибки (Error)

The ttyname() function may fail if:

       EBADF  The fildes argument is not a valid file descriptor.

       ENOTTY The file associated with the fildes argument is not a
              terminal.

       The ttyname_r() function may fail if:

       EBADF  The fildes argument is not a valid file descriptor.

       ENOTTY The file associated with the fildes argument is not a
              terminal.

       ERANGE The value of namesize is smaller than the length of the
              string to be returned including the terminating null
              character.

       The following sections are informative.

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Примеры (Examples)

None.

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Использование в приложениях (Application usage)

None.

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Обоснование (Rationale)

The term ``terminal'' is used instead of the historical term
       ``terminal device'' in order to avoid a reference to an undefined
       term.

       The thread-safe version places the terminal name in a user-
       supplied buffer and returns a non-zero value if it fails. The
       non-thread-safe version may return the name in a static data area
       that may be overwritten by each call.

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Будущие направления (Future directions)

None.

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Смотри также (See also)

The Base Definitions volume of POSIX.1‐2017, unistd.h(0p)

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