usr/src/lib/libast/common/comp/getgroups.c

   1 /***********************************************************************
   2 *                                                                      *
   3 *               This software is part of the ast package               *
   4 *          Copyright (c) 1985-2010 AT&T Intellectual Property          *
   5 *                      and is licensed under the                       *
   6 *                  Common Public License, Version 1.0                  *
   7 *                    by AT&T Intellectual Property                     *
   8 *                                                                      *
   9 *                A copy of the License is available at                 *
  10 *            http://www.opensource.org/licenses/cpl1.0.txt             *
  11 *         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
  12 *                                                                      *
  13 *              Information and Software Systems Research               *
  14 *                            AT&T Research                             *
  15 *                           Florham Park NJ                            *
  16 *                                                                      *
  17 *                 Glenn Fowler <gsf@research.att.com>                  *
  18 *                  David Korn <dgk@research.att.com>                   *
  19 *                   Phong Vo <kpv@research.att.com>                    *
  20 *                                                                      *
  21 ***********************************************************************/
  22 #pragma prototyped
  23
  24 #include <ast.h>
  25
  26 #if !defined(getgroups) && defined(_lib_getgroups)
  27
  28 NoN(getgroups)
  29
  30 #else
  31
  32 #include <error.h>
  33
  34 #if defined(getgroups)
  35 #undef  getgroups
  36 #define ast_getgroups   _ast_getgroups
  37 #define botched         1
  38 extern int              getgroups(int, int*);
  39 #else
  40 #define ast_getgroups   getgroups
  41 #endif
  42
  43 #if defined(__EXPORT__)
  44 #define extern  __EXPORT__
  45 #endif
  46
  47 extern int
  48 ast_getgroups(int len, gid_t* set)
  49 {
  50 #if botched
  51 #if NGROUPS_MAX < 1
  52 #undef  NGROUPS_MAX
  53 #define NGROUPS_MAX     1
  54 #endif
  55         register int    i;
  56         int             big[NGROUPS_MAX];
  57 #else
  58 #undef  NGROUPS_MAX
  59 #define NGROUPS_MAX     1
  60 #endif
  61         if (!len) return(NGROUPS_MAX);
  62         if (len < 0 || !set)
  63         {
  64                 errno = EINVAL;
  65                 return(-1);
  66         }
  67 #if botched
  68         len = getgroups(len > NGROUPS_MAX ? NGROUPS_MAX : len, big);
  69         for (i = 0; i < len; i++)
  70                 set[i] = big[i];
  71         return(len);
  72 #else
  73         *set = getgid();
  74         return(1);
  75 #endif
  76 }
  77
  78 #endif