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Linux 2.6 - man page for ttyname (linux section 3)

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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 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.

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 pathname.

ATTRIBUTES
   Multithreading (see pthreads(7))
       The ttyname() function is not thread-safe.

       The ttyname_r() function is thread-safe.

CONFORMING TO
       4.2BSD, POSIX.1-2001.

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

COLOPHON
       This  page  is  part of release 3.55 of the Linux man-pages project.  A description of the
       project,    and	  information	 about	  reporting    bugs,	can    be    found     at
       http://www.kernel.org/doc/man-pages/.

Linux					    2013-06-21				       TTYNAME(3)
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