compilers/linux86-0.16.17/libc/getent/grent.c

   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 /*
  22  * setgrent(), endgrent(), and getgrent() are mutually-dependent functions,
  23  * so they are all included in the same object file, and thus all linked
  24  * in together.
  25  */
  26
  27 #include <unistd.h>
  28 #include <fcntl.h>
  29 #include <grp.h>
  30
  31 static int grp_fd=-1;
  32
  33 void
  34 setgrent(void)
  35 {
  36   if (grp_fd!=-1)
  37     close(grp_fd);
  38   grp_fd=open("/etc/group", O_RDONLY);
  39 }
  40
  41 void
  42 endgrent(void)
  43 {
  44  if (grp_fd!=-1)
  45    close(grp_fd);
  46  grp_fd=-1;
  47 }
  48
  49 struct group *
  50 getgrent(void)
  51 {
  52   if (grp_fd==-1)
  53     return NULL;
  54   return __getgrent(grp_fd);
  55 }
  56
  57