term% cat index.txt TTYNAME(3) Library Functions Manual TTYNAME(3)
NAME
ttyname, cttyname, isatty, ttyslot - find name of a terminal
SYNOPSIS
char *ttyname(fildes)
char *cttyname()
isatty(fildes)
ttyslot()
DESCRIPTION
Ttyname returns a pointer to the null-terminated path name of the ter‐
minal device associated with file descriptor fildes.
Cttyname returns a pointer to the path name of the terminal device as‐
sociated with the first file descriptor among 0,1,2 that is connected
to a terminal device. This probably is the control terminal for the
present process.
Isatty returns 1 if fildes is associated with a terminal device, 0 oth‐
erwise.
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 fildes does not describe a termi‐
nal 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.
TTYNAME(3)