tcgetpgrp.c 1.2 KB

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  1. /* Copyright (C) 1991, 1997, 2002 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 <sys/ioctl.h>
  16. #include <errno.h>
  17. #include <unistd.h>
  18. #include <sys/types.h>
  19. libc_hidden_proto(tcgetpgrp)
  20. libc_hidden_proto(ioctl)
  21. /* Return the foreground process group ID of FD. */
  22. pid_t tcgetpgrp (int fd)
  23. {
  24. int pgrp;
  25. if (ioctl (fd, TIOCGPGRP, &pgrp) < 0)
  26. return (pid_t) -1;
  27. return (pid_t) pgrp;
  28. }
  29. libc_hidden_def (tcgetpgrp)