TTYNAME(3P)TTYNAME(3P)NAME
ttyname, isatty - find name of a terminal
SYNOPSIS
#include <unistd.h>
char *ttyname(int fd)
int isatty(int fd)
(ALSO AVAILABLE IN BSD)
int ttyslot(void);
DESCRIPTION
Ttyname returns a pointer to the null-terminated path name of the
terminal device associated with file descriptor fd.
Isatty returns 1 if fd 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. Ttyslot is not a POSIX
function.
RETURN VALUE
The ttyname function returns a NULL pointer if fd is not a valid file
descriptor associated with a terminal or if the pathname cannot be
determined.
Ttyslot returns 0 if `/etc/ttys' is inaccessible or if it cannot
determine the control terminal.
FILES
/dev/∗
/etc/ttys
SEE ALSOioctl(2), ttys(5)BUGS
The return value points to static data whose content is overwritten by
each call.
7th Edition May 15, 1985 TTYNAME(3P)