ctermid(3S)                                           ctermid(3S)



     NAME
          ctermid - generate filename for terminal

     SYNOPSIS
          #include <stdio.h>

          char *ctermid(s)
          char *s;

     DESCRIPTION
          ctermid generates the pathname 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 pathname 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
          refers to the terminal if used as a filename.  For this
          reason, ttyname is useful only if the process already has at
          least one file open to a terminal.

     SEE ALSO
          ttyname(3C).























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