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 * Eclipse Public License, Version 1.0 *
7 * by AT&T Intellectual Property *
8 * *
9 * A copy of the License is available at *
10 * http://www.eclipse.org/org/documents/epl-v10.html *
11 * (with md5 checksum b35adb5213ca9657e911e9befb180842) *
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
slowexcept(Sfio_t * f,int type,Void_t * v,Sfdisc_t * disc)31 static int slowexcept(Sfio_t* f, int type, Void_t* v, Sfdisc_t* disc)
32 #else
33 static int slowexcept(f, type, v, disc)
34 Sfio_t* f;
35 int type;
36 Void_t* v;
37 Sfdisc_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
sfdcslow(Sfio_t * f)61 int sfdcslow(Sfio_t* f)
62 #else
63 int sfdcslow(f)
64 Sfio_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 sfset(f,SF_IOINTR,1);
82
83 return(0);
84 }
85