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lseek3d.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*          Copyright (c) 1989-2007 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>                   *
*                   Eduardo Krell <ekrell@adexus.cl>                   *
*                                                                      *
***********************************************************************/
#pragma prototyped

#if defined(__STDPP__directive) && defined(__STDPP__hide)
__STDPP__directive pragma pp:hide lseek
#else
#define lseek        ______lseek
#endif
#define _def_syscall_3d 1
#define _LS_H           1

#include "3d.h"

#undef      _def_syscall_3d
#if defined(__STDPP__directive) && defined(__STDPP__hide)
__STDPP__directive pragma pp:nohide lseek
#else
#undef  lseek
#endif

#include "FEATURE/syscall"

#ifdef      lseek3d

#if !_nosys_lseek64 && _typ_off64_t

typedef off64_t (*Seek64_f)(int, off64_t, int);

#undef      off_t
#undef      lseek

off64_t
lseek64(int fd, off64_t off, int op)
{
      off64_t           r;
      int         n;
      int         m;

      static Seek64_f   seekf;
#if FS
      Mount_t*    mp;

      if (!fscall(NiL, MSG_seek, 0, fd, off, op))
            return state.ret;
      mp = monitored();
#endif
      if (!seekf)
            seekf = (Seek64_f)sysfunc(SYS3D_lseek64);
      for (m = state.trap.size - 1; m >= 0; m--)
            if (MSG_MASK(MSG_seek) & state.trap.intercept[m].mask)
                  break;
      if (m >= 0)
      {
            n = state.trap.size;
            state.trap.size = m;
            r = (*state.trap.intercept[m].call)(&state.trap.intercept[m], MSG_seek, SYS3D_lseek64, (void*)fd, (void*)&off, (void*)op, NiL, NiL, NiL) ? -1 : off;
            state.trap.size = n;
      }
      else
            r = (*seekf)(fd, off, op);
#if FS
      if (r != (off64_t)(-1))
      {
            if (mp)
                  fscall(mp, MSG_seek, r, fd, off, op);
            for (mp = state.global; mp; mp = mp->global)
                  if (fssys(mp, MSG_seek))
                        fscall(mp, MSG_seek, r, fd, off, op);
      }
#endif
      return r;
}

#endif

typedef off_t (*Seek_f)(int, off_t, int);

off_t
lseek3d(int fd, off_t off, int op)
{
      off_t       r;

      static Seek_f     seekf;

#if FS
      Mount_t*    mp;

      if (!fscall(NiL, MSG_seek, 0, fd, off, op))
            return state.ret;
      mp = monitored();
#endif
      if (sizeof(off_t) > sizeof(long))
      {
            if (!seekf)
                  seekf = (Seek_f)sysfunc(SYS3D_lseek);
            r = (*seekf)(fd, off, op);
      }
      else if ((r = LSEEK(fd, off, op)) == -1)
            return -1;
#if FS
      if (mp)
            fscall(mp, MSG_seek, r, fd, off, op);
      for (mp = state.global; mp; mp = mp->global)
            if (fssys(mp, MSG_seek))
                  fscall(mp, MSG_seek, r, fd, off, op);
#endif
      return r;
}

#else

NoN(lseek)

#endif

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