ttyname(3C)ttyname(3C)NAMEttyname(), ttyname_r(), isatty() - find name of a terminal
returns a pointer to a string containing the null-terminated path name
of the terminal device associated with file descriptor fildes.
returns 1 if fildes is associated with a terminal device, 0 otherwise.
returns the result string in the supplied buffer. The buffer is buflen
characters long and should have space for the name and the terminating
null character. The maximum length of the terminal name is
returns a NULL pointer if fildes does not describe a terminal device in
directory returns a zero upon success and an error number upon failure.
and fail if any of the following conditions are encountered:
The fildes argument is invalid.
An inappropriate I/O control operation has been attempted.
The return value for points to static data whose content is overwritten
by each call.
For streams ptys, and do not consider master ptys to be tty devices.
It should also be noted that returns a pointer to the master pty name
for all master pty devices. This is a result of device files being
Users of should also note that the prototype of this function has
changed in this release for conformance with the POSIX.1c Threads stan‐
dard. The old prototype of is supported for compatibility with exist‐
ing DCE applications only.