1/***********************************************************************
2*                                                                      *
3*               This software is part of the ast package               *
4*          Copyright (c) 1985-2011 AT&T Intellectual Property          *
5*                      and is licensed under the                       *
6*                  Common Public License, Version 1.0                  *
7*                    by AT&T Intellectual Property                     *
8*                                                                      *
9*                A copy of the License is available at                 *
10*            http://www.opensource.org/licenses/cpl1.0.txt             *
11*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
12*                                                                      *
13*              Information and Software Systems Research               *
14*                            AT&T Research                             *
15*                           Florham Park NJ                            *
16*                                                                      *
17*                 Glenn Fowler <gsf@research.att.com>                  *
18*                  David Korn <dgk@research.att.com>                   *
19*                   Phong Vo <kpv@research.att.com>                    *
20*                                                                      *
21***********************************************************************/
22#include "sfdchdr.h"
23
24/*	Make a stream op return immediately on interrupts.
25**	This is useful on slow streams (hence the name).
26**
27**	Written by Glenn Fowler (03/18/1998).
28*/
29
30#if __STD_C
31static int slowexcept(Sfio_t* f, int type, Void_t* v, Sfdisc_t* disc)
32#else
33static int slowexcept(f, type, v, disc)
34Sfio_t*		f;
35int		type;
36Void_t*		v;
37Sfdisc_t*	disc;
38#endif
39{
40	NOTUSED(f);
41	NOTUSED(v);
42	NOTUSED(disc);
43
44	switch (type)
45	{
46	case SF_FINAL:
47	case SF_DPOP:
48		free(disc);
49		break;
50	case SF_READ:
51	case SF_WRITE:
52		if (errno == EINTR)
53			return(-1);
54		break;
55	}
56
57	return(0);
58}
59
60#if __STD_C
61int sfdcslow(Sfio_t* f)
62#else
63int sfdcslow(f)
64Sfio_t*	f;
65#endif
66{
67	Sfdisc_t*	disc;
68
69	if(!(disc = (Sfdisc_t*)malloc(sizeof(Sfdisc_t))) )
70		return(-1);
71
72	disc->readf = NIL(Sfread_f);
73	disc->writef = NIL(Sfwrite_f);
74	disc->seekf = NIL(Sfseek_f);
75	disc->exceptf = slowexcept;
76
77	if(sfdisc(f,disc) != disc)
78	{	free(disc);
79		return(-1);
80	}
81
82	return(0);
83}
84