sfdcslow.c revision 7c2fbfb345896881c631598ee3852ce9ce33fb07
/***********************************************************************
* *
* 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);
}