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BSD 2.11 - man page for ttyslot (bsd section 3)

TTYNAME(3)				       Library Functions Manual 				   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 terminal 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 terminal device in directory `/dev'. Ttyslot returns 0 if `/etc/ttys' is inaccessible or if it cannot determine 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)


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