TTYNAME
NAME
ttyname, ttyname_r - return name of a terminal
SYNOPSIS
#include <unistd.h>
I char *ttyname(int fd );
I int ttyname_r(int fd , char * buf , size_t buflen );
DESCRIPTION
The function
R 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
R ttyname_r ()
stores this pathname in the buffer
buf
of length
R buflen .
RETURN VALUE
The function
R ttyname ()
returns a pointer to a pathname on success.
On error, NULL is returned, and
errno
is set appropriately.
The function
R ttyname_r ()
returns 0 on success, and an error number upon error.
ERRORS
Values stored in
errno
by a failing
R ttyname ()
or returned by a failing
R 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
ČLÁNKY DO MAILU