ttyname_r

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 NUL-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
       Values stored in errno by a failing ttyname() or returned by a failing
       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
       POSIX.1

SEE ALSO
       fstat(2), isatty(3)



Linux				  2002-07-20			   TTYNAME(3)