ttyname(3C)

find name of a terminal

From the original Amiga UNIX 2.1 manual. Some things it mentions may not be in this release.

NAME

ttyname, isatty - find name of a terminal

#include <stdlib.h>

char *ttyname (int fildes);

int isatty (int fildes);

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.

/dev/*

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

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