TTYNAME(3) TTYNAME(3) NAME ttyname, isatty, ttyslot - find name of a terminal SYNOPSIS char *ttyname(filedes) isatty(filedes) ttyslot() DESCRIPTION Ttyname returns a pointer to the null-terminated path name of the ter‐ minal device associated with file descriptor filedes (this is a system file descriptor and has nothing to do with the standard I/O FILE type‐ def). Isatty returns 1 if filedes is associated with a terminal device, 0 otherwise. Ttyslot returns the number of the entry in the ttys(5) file for the control terminal of the current process. FILES /dev/∗ /etc/ttys SEE ALSO ioctl(2), ttys(5) DIAGNOSTICS Ttyname returns a null pointer (0) if filedes does not describe a ter‐ minal device in directory ‘/dev’. Ttyslot returns 0 if ‘/etc/ttys’ is inaccessible or if it cannot deter‐ mine the control terminal. BUGS The return value points to static data whose content is overwritten by each call. 7th Edition May 15, 1985 TTYNAME(3)