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 3.54 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/.