grent.c 1.4 KB

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  1. /*
  2. * grent.c - This file is part of the libc-8086/grp package for ELKS,
  3. * Copyright (C) 1995, 1996 Nat Friedman <ndf@linux.mit.edu>.
  4. *
  5. * This library is free software; you can redistribute it and/or
  6. * modify it under the terms of the GNU Library General Public
  7. * License as published by the Free Software Foundation; either
  8. * version 2 of the License, or (at your option) any later version.
  9. *
  10. * This library is distributed in the hope that it will be useful,
  11. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  13. * Library General Public License for more details.
  14. *
  15. * You should have received a copy of the GNU Library General Public
  16. * License along with this library; if not, write to the Free
  17. * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18. *
  19. */
  20. /*
  21. * setgrent(), endgrent(), and getgrent() are mutually-dependent functions,
  22. * so they are all included in the same object file, and thus all linked
  23. * in together.
  24. */
  25. #include <unistd.h>
  26. #include <fcntl.h>
  27. #include <paths.h>
  28. #include "config.h"
  29. static int grp_fd = -1;
  30. void setgrent(void)
  31. {
  32. if (grp_fd != -1)
  33. close(grp_fd);
  34. grp_fd = open(_PATH_GROUP, O_RDONLY);
  35. }
  36. void endgrent(void)
  37. {
  38. if (grp_fd != -1)
  39. close(grp_fd);
  40. grp_fd = -1;
  41. }
  42. struct group *getgrent(void)
  43. {
  44. if (grp_fd == -1)
  45. return NULL;
  46. return __getgrent(grp_fd);
  47. }