isatty man page on Ultrix

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ttyname(3)							    ttyname(3)

Name
       ttyname, isatty, ttyslot - find terminal name

Syntax
       char *ttyname(filedes)

       isatty(filedes)

       ttyslot()

Description
       The  subroutine	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
       typedef).

       The subroutine returns 1 if  filedes  is	 associated  with  a  terminal
       device, 0 otherwise.

       The subroutine returns the number of the entry in the file for the con‐
       trol terminal of the current process.

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

Diagnostics
       The  subroutine returns a null pointer (0) if filedes does not describe
       a terminal device in directory

       The subroutine returns 0 if is inaccessible or if it  cannot  determine
       the control terminal.

Files
       /dev/∗
       /etc/ttys

See Also
       ioctl(2), ttys(5)

								    ttyname(3)
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