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getgroups.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*          Copyright (c) 1985-2009 AT&T Intellectual Property          *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                    by AT&T Intellectual Property                     *
*                                                                      *
*                A copy of the License is available at                 *
*            http://www.opensource.org/licenses/cpl1.0.txt             *
*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
*                                                                      *
*              Information and Software Systems Research               *
*                            AT&T Research                             *
*                           Florham Park NJ                            *
*                                                                      *
*                 Glenn Fowler <gsf@research.att.com>                  *
*                  David Korn <dgk@research.att.com>                   *
*                   Phong Vo <kpv@research.att.com>                    *
*                                                                      *
***********************************************************************/
#pragma prototyped

#include <ast.h>

#if !defined(getgroups) && defined(_lib_getgroups)

NoN(getgroups)

#else

#include <error.h>

#if defined(getgroups)
#undef      getgroups
#define     ast_getgroups     _ast_getgroups
#define botched         1
extern int        getgroups(int, int*);
#else
#define ast_getgroups   getgroups
#endif

#if defined(__EXPORT__)
#define extern    __EXPORT__
#endif

extern int
ast_getgroups(int len, gid_t* set)
{
#if botched
#if NGROUPS_MAX < 1
#undef      NGROUPS_MAX
#define NGROUPS_MAX     1
#endif
      register int      i;
      int         big[NGROUPS_MAX];
#else
#undef      NGROUPS_MAX
#define NGROUPS_MAX     1
#endif
      if (!len) return(NGROUPS_MAX);
      if (len < 0 || !set)
      {
            errno = EINVAL;
            return(-1);
      }
#if botched
      len = getgroups(len > NGROUPS_MAX ? NGROUPS_MAX : len, big);
      for (i = 0; i < len; i++)
            set[i] = big[i];
      return(len);
#else
      *set = getgid();
      return(1);
#endif
}

#endif

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