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TTYNAME(3P) POSIX Programmer's Manual TTYNAME(3P)
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.
ttyname, ttyname_r — find the pathname of a terminal
#include <unistd.h>
char *ttyname(int fildes);
int ttyname_r(int fildes, char *name, size_t namesize);
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 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}.
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.
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.
None.
None.
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.
None.
The Base Definitions volume of POSIX.1‐2008, unistd.h(0p)
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2013 Edition, Standard for Information
Technology -- Portable Operating System Interface (POSIX), The Open
Group Base Specifications Issue 7, Copyright (C) 2013 by the
Institute of Electrical and Electronics Engineers, Inc and The Open
Group. (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1
applied.) In the event of any discrepancy between this version and
the original IEEE and The Open Group Standard, the original IEEE and
The Open Group Standard is the referee document. The original
Standard can be obtained online at http://www.unix.org/online.html .
Any typographical or formatting errors that appear in this page are
most likely to have been introduced during the conversion of the
source files to man page format. To report such errors, see
https://www.kernel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group 2013 TTYNAME(3P)
Pages that refer to this page: unistd.h(0p), tty(1p), ctermid(3p), ptsname(3p)