linux man page for ttyname

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 func-
       tion ttyname_r() returns 0 on success, and an error number upon error.

ERRORS
       ttyname_r():

       EBADF  Bad file descriptor.

       ENOTTY File descriptor does not refer to a terminal device.

       ERANGE buflen was too small to allow storing the pathname.

CONFORMING TO
       4.2BSD, POSIX.1-2001.

SEE ALSO
       fstat(2), isatty(3)

COLOPHON
       This page is part of release 3.27 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								    2008-07-14								TTYNAME(3)