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sfdcslow.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*          Copyright (c) 1985-2008 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>                    *
*                                                                      *
***********************************************************************/
#include "sfdchdr.h"

/*    Make a stream op return immediately on interrupts.
**    This is useful on slow streams (hence the name).
**
**    Written by Glenn Fowler (03/18/1998).
*/

#if __STD_C
static int slowexcept(Sfio_t* f, int type, Void_t* v, Sfdisc_t* disc)
#else
static int slowexcept(f, type, v, disc)
Sfio_t*           f;
int         type;
Void_t*           v;
Sfdisc_t*   disc;
#endif
{
      NOTUSED(f);
      NOTUSED(v);
      NOTUSED(disc);

      switch (type)
      {
      case SF_FINAL:
      case SF_DPOP:
            free(disc);
            break;
      case SF_READ:
      case SF_WRITE:
            if (errno == EINTR)
                  return(-1);
            break;
      }

      return(0);
}

#if __STD_C
int sfdcslow(Sfio_t* f)
#else
int sfdcslow(f)
Sfio_t*     f;
#endif
{
      Sfdisc_t*   disc;

      if(!(disc = (Sfdisc_t*)malloc(sizeof(Sfdisc_t))) )
            return(-1);

      disc->readf = NIL(Sfread_f);
      disc->writef = NIL(Sfwrite_f);
      disc->seekf = NIL(Sfseek_f);
      disc->exceptf = slowexcept;

      if(sfdisc(f,disc) != disc)
      {     free(disc);
            return(-1);
      }

      return(0);
}

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