getgrgid.c 1.2 KB

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  1. /*
  2. * getgrgid.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. #include <sys/types.h>
  21. #include <unistd.h>
  22. #include <fcntl.h>
  23. #include <grp.h>
  24. struct group *getgrgid(const gid_t gid)
  25. {
  26. struct group *group;
  27. int grp_fd;
  28. if ((grp_fd = open("/etc/group", O_RDONLY)) < 0)
  29. return NULL;
  30. while ((group = __getgrent(grp_fd)) != NULL)
  31. if (group->gr_gid == gid) {
  32. close(grp_fd);
  33. return group;
  34. }
  35. close(grp_fd);
  36. return NULL;
  37. }