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att
GitHub Repository: att/ast
 Path: blob/master/src/lib/libast/disc/sfdcslow.c
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/***********************************************************************

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*                                                                      *

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*               This software is part of the ast package               *

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*          Copyright (c) 1985-2011 AT&T Intellectual Property          *

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*                      and is licensed under the                       *

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*                 Eclipse Public License, Version 1.0                  *

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*                    by AT&T Intellectual Property                     *

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*                                                                      *

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*                A copy of the License is available at                 *

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*          http://www.eclipse.org/org/documents/epl-v10.html           *

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*         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *

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*                                                                      *

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*              Information and Software Systems Research               *

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*                            AT&T Research                             *

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*                           Florham Park NJ                            *

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*                                                                      *

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*                 Glenn Fowler <[email protected]>                  *

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*                  David Korn <[email protected]>                   *

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*                   Phong Vo <[email protected]>                    *

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*                                                                      *

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***********************************************************************/

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#include "sfdchdr.h"

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/*	Make a stream op return immediately on interrupts.

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**	This is useful on slow streams (hence the name).

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**

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**	Written by Glenn Fowler (03/18/1998).

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*/

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#if __STD_C

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static int slowexcept(Sfio_t* f, int type, Void_t* v, Sfdisc_t* disc)

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#else

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static int slowexcept(f, type, v, disc)

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Sfio_t*		f;

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int		type;

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Void_t*		v;

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Sfdisc_t*	disc;

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#endif

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{

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	NOTUSED(f);

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	NOTUSED(v);

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	NOTUSED(disc);

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	switch (type)

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	{

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	case SF_FINAL:

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	case SF_DPOP:

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		free(disc);

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		break;

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	case SF_READ:

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	case SF_WRITE:

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		if (errno == EINTR)

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			return(-1);

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		break;

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	}

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	return(0);

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}

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#if __STD_C

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int sfdcslow(Sfio_t* f)

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#else

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int sfdcslow(f)

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Sfio_t*	f;

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#endif

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{

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	Sfdisc_t*	disc;

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	if(!(disc = (Sfdisc_t*)malloc(sizeof(Sfdisc_t))) )

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		return(-1);

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	disc->readf = NIL(Sfread_f);

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	disc->writef = NIL(Sfwrite_f);

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	disc->seekf = NIL(Sfseek_f);

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	disc->exceptf = slowexcept;

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	if(sfdisc(f,disc) != disc)

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	{	free(disc);

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		return(-1);

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	}

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	sfset(f,SF_IOINTR,1);

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	return(0);

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}

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