ctermid.c 1.2 KB

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  1. /* Copyright (C) 1991, 1997 Free Software Foundation, Inc.
  2. This file is part of the GNU C Library.
  3. The GNU C Library is free software; you can redistribute it and/or
  4. modify it under the terms of the GNU Lesser General Public
  5. License as published by the Free Software Foundation; either
  6. version 2.1 of the License, or (at your option) any later version.
  7. The GNU C Library is distributed in the hope that it will be useful,
  8. but WITHOUT ANY WARRANTY; without even the implied warranty of
  9. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  10. Lesser General Public License for more details.
  11. You should have received a copy of the GNU Lesser General Public
  12. License along with the GNU C Library; if not, write to the Free
  13. Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  14. 02111-1307 USA. */
  15. #include <stdio.h>
  16. #include <string.h>
  17. /* Return the name of the controlling terminal.
  18. If S is not NULL, the name is copied into it (it should be at
  19. least L_ctermid bytes long), otherwise a static buffer is used. */
  20. char *
  21. ctermid (s)
  22. char *s;
  23. {
  24. static char name[L_ctermid];
  25. if (s == NULL)
  26. s = name;
  27. return strcpy (s, "/dev/tty");
  28. }