TTYNAME(3) TTYNAME(3)
NAME
ttyname, isatty, nametty - find or set name of a terminal
SYNOPSIS
char *ttyname(fildes)
isatty(fildes)
nametty(fildes, file)
char *file;
DESCRIPTION
Ttyname returns a pointer to the null-terminated path name
of the terminal device associated with file descriptor
fildes.
Isatty returns 1 if fildes is associated with a terminal
device, 0 otherwise.
Nametty arranges that future opens of file will refer to the
stream opened on fildes. File must exist before nametty is
called. The arrangement is terminated when the other end of
the stream is closed or hung up.
FILES
list of tty directories for ttyname
SEE ALSO
fmount(2), ioctl(2)
DIAGNOSTICS
Ttyname returns `NULL' if fildes does not describe an entry
in any of the directories listed in
Nametty returns 1 for success, 0 for failure (file does not
exist, fildes is not a stream).
BUGS
The return value of ttyname points to static data whose con-
tent is overwritten by each call.
If fildes is a network connection, isatty may produce
answers having more to do with the network than to the file
to which network data is copied. In particular, it always
returns no for connections set up by rx, and always returns
yes for connections arranged by dcon; see con(1).