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read3d.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*           Copyright (c) 1989-2007 AT&T Knowledge Ventures            *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                      by AT&T Knowledge Ventures                      *
*                                                                      *
*                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>                   *
*                   Eduardo Krell <ekrell@adexus.cl>                   *
*                                                                      *
***********************************************************************/
#pragma prototyped

#include "3d.h"

#ifdef      read3d

ssize_t
read3d(int fd, void* buf, size_t n)
{
      register ssize_t  r;
#if FS
      Mount_t*          mp;
      off_t             off;
      int               pos = 0;
      
      if (!fscall(NiL, MSG_read, 0, fd, buf, n))
            return(state.ret);
      mp = monitored();
#endif
      r = READ(fd, buf, n);
#if FS
      if (r >= 0)
      {
            if (mp)
            {
                  if (!pos)
                  {
                        pos = 1;
                        off = LSEEK(fd, 0, SEEK_CUR) - r;
                  }
                  fscall(mp, r, MSG_read3d, fd, buf, n, off);
            }
            for (mp = state.global; mp; mp = mp->global)
                  if (fssys(mp, MSG_read))
                  {
                        if (!pos)
                        {
                              pos = 1;
                              off = LSEEK(fd, 0, SEEK_CUR) - r;
                        }
                        fscall(mp, MSG_read3d, r, fd, buf, n, off);
                  }
      }
#endif
      return(r);
}

#else

NoN(read)

#endif

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