1 #ifndef lint
2 static char *rcsid = "$Id: ioecall.c,v 1.2 1996/09/30 09:19:52 ishisone Exp $";
3 #endif
4 /*
5 * Copyright (C) 1994 Software Research Associates, Inc.
6 *
7 * Permission to use, copy, modify, and distribute this software and its
8 * documentation for any purpose and without fee is hereby granted, provided
9 * that the above copyright notice appear in all copies and that both that
10 * copyright notice and this permission notice appear in supporting
11 * documentation, and that the name of Software Research Associates not be
12 * used in advertising or publicity pertaining to distribution of the
13 * software without specific, written prior permission. Software Research
14 * Associates makes no representations about the suitability of this software
15 * for any purpose. It is provided "as is" without express or implied
16 * warranty.
17 *
18 * Author: Makoto Ishisone, Software Research Associates, Inc., Japan
19 */
20
21 /*
22 * X I/O error callback
23 */
24
25 #include <stdio.h>
26 #include <X11/Xlib.h>
27 #include <X11/Xfuncproto.h>
28 #include "IOECall.h"
29
30 #ifndef NULL
31 #define NULL 0
32 #endif
33
34 typedef struct ioe_cb_desc_ {
35 void (*callback)();
36 XPointer client_data;
37 struct ioe_cb_desc_ *next;
38 } CBDesc;
39
40 static CBDesc *cb_list;
41
42 static int (*original_handler)();
43
44 static int
XIOEHandler(dpy)45 XIOEHandler(dpy)
46 Display *dpy;
47 {
48 CBDesc *cb;
49
50 cb = cb_list;
51 while (cb != NULL) {
52 (*cb->callback)(cb->client_data);
53 cb = cb->next;
54 }
55 return (*original_handler)(dpy);
56 }
57
58 void
XIOEInit()59 XIOEInit()
60 {
61 int (*oldhandler)() = XSetIOErrorHandler(XIOEHandler);
62
63 if (oldhandler != XIOEHandler) original_handler = oldhandler;
64 }
65
66 XIOEHandle
67 XIOESet(handler, client_data)
68 void (*handler)();
69 XPointer client_data;
70 {
71 CBDesc *cb;
72
73 cb = (CBDesc *)malloc(sizeof(CBDesc));
74 if (cb == NULL) return NULL;
75
76 cb->callback = handler;
77 cb->client_data = client_data;
78 cb->next = NULL;
79
80 if (cb_list == NULL) {
81 cb_list = cb;
82 } else {
83 CBDesc *p = cb_list;
84
85 while (p->next != NULL) p = p->next;
86 p->next = cb;
87 }
88
89 return cb;
90 }
91
92 void
XIOEUnset(handle)93 XIOEUnset(handle)
94 XIOEHandle handle;
95 {
96 CBDesc *cb, *cb0;
97
98 cb = cb_list;
99 cb0 = NULL;
100
101 while (cb != NULL) {
102 if (cb == handle) {
103 if (cb0 == NULL) {
104 cb_list = cb->next;
105 } else {
106 cb0->next = cb->next;
107 }
108 (void)free((char *)cb);
109 return;
110 }
111 cb = cb->next;
112 }
113 }
114