TTYNAME(3)		   Linux Programmer's Manual		    TTYNAME(3)



NAME
       ttyname, ttyname_r - return name of a terminal

SYNOPSIS
       #include <unistd.h>

       char *ttyname(int fd);

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

DESCRIPTION
       The  function  ttyname() returns a pointer to the null-terminated path-
       name 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.

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

ERRORS
       EBADF  Bad file descriptor.

       ENOTTY File descriptor does not refer to a terminal device.

       ERANGE (ttyname_r()) buflen was too small to allow  storing  the	 path-
	      name.

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		     |
       +------------+---------------+------------------------+
CONFORMING TO
       POSIX.1-2001, POSIX.1-2008, 4.2BSD.

SEE ALSO
       tty(1), fstat(2), ctermid(3), isatty(3)

COLOPHON
       This page is part of release 4.10 of the Linux  man-pages  project.   A
       description  of	the project, information about reporting bugs, and the
       latest	 version    of	  this	  page,	   can	   be	  found	    at
       https://www.kernel.org/doc/man-pages/.



Linux				  2016-12-12			    TTYNAME(3)