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

DESCRIPTION
       The function ttyname() returns a pointer to the NUL-terminated pathname
       of the terminal device that is open on the  file  descriptor  desc,  or
       NULL  on  error  (for example, if desc 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)