NAME

ttyname, isatty − find name of a terminal

SYNOPSIS

char ∗ttyname (fildes)
int fildes;

int isatty (fildes)
int fildes;

DESCRIPTION

ttyname returns a pointer to a string containing 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. 

FILES

/dev/∗

DIAGNOSTICS

ttyname returns a NULL pointer if fildes does not describe a terminal device in directory /dev.

CAVEAT

The return value points to static data whose content is overwritten by each call. 

March 13, 1992