ctermid(3S)         (C Programming Language Utilities)          ctermid(3S)


   NAME
         ctermid - generate file name for terminal

   SYNOPSIS
         #include <stdio.h>

         char *ctermid (char *s);

   DESCRIPTION
         ctermid generates the path name of the controlling terminal for the
         current process, and stores it in a string.

         If s is a NULL pointer, the string is stored in an internal static
         area, the contents of which are overwritten at the next call to
         ctermid, and the address of which is returned.  Otherwise, s is
         assumed to point to a character array of at least Lctermid elements;
         the path name is placed in this array and the value of s is returned.
         The constant Lctermid is defined in the <stdio.h> header file.

   NOTES
         The difference between ctermid and ttyname(3C) is that ttyname must
         be handed a file descriptor and returns the actual name of the
         terminal associated with that file descriptor, while ctermid returns
         a string (/dev/tty) that will refer to the terminal if used as a file
         name.  Thus ttyname is useful only if the process already has at
         least one file open to a terminal.

   SEE ALSO
         ttyname(3C).
























   7/91                                                                 Page 1