2 * Copyright (c) 1995-1999, Index Data
3 * See the file LICENSE for details.
4 * Sebastian Hammer, Adam Dickmeiss
7 * Revision 1.28 1999-08-27 09:40:32 adam
8 * Renamed logf function to yaz_log. Removed VC++ project files.
10 * Revision 1.27 1999/02/02 13:57:34 adam
11 * Uses preprocessor define WIN32 instead of WINDOWS to build code
12 * for Microsoft WIN32.
14 * Revision 1.26 1998/02/11 11:53:35 adam
15 * Changed code so that it compiles as C++.
17 * Revision 1.25 1998/01/29 13:30:23 adam
18 * Better event handle system for NT/Unix.
20 * Revision 1.24 1997/09/04 14:19:13 adam
23 * Revision 1.23 1997/09/01 08:52:59 adam
24 * New windows NT/95 port using MSV5.0. The test server 'ztest' was
25 * moved a separate directory. MSV5.0 project server.dsp created.
26 * As an option, the server can now operate as an NT service.
28 * Revision 1.22 1996/07/06 19:58:35 quinn
29 * System headerfiles gathered in yconfig
31 * Revision 1.21 1996/02/21 12:55:51 quinn
34 * Revision 1.20 1996/02/21 12:52:55 quinn
37 * Revision 1.19 1995/12/05 11:17:30 quinn
38 * Moved some paranthesises around. Sigh.
40 * Revision 1.18 1995/11/13 09:27:41 quinn
41 * Fiddling with the variant stuff.
43 * Revision 1.17 1995/11/07 12:37:44 quinn
44 * Added support for forcing TIMEOUT event.
46 * Revision 1.16 1995/11/01 13:54:56 quinn
49 * Revision 1.15 1995/09/15 14:44:15 quinn
50 * *** empty log message ***
52 * Revision 1.14 1995/08/29 14:44:50 quinn
55 * Revision 1.13 1995/08/29 11:17:56 quinn
56 * Added code to receive close
58 * Revision 1.12 1995/08/29 10:41:18 quinn
61 * Revision 1.11 1995/06/19 12:39:09 quinn
62 * Fixed bug in timeout code. Added BER dumper.
64 * Revision 1.10 1995/06/16 10:31:33 quinn
65 * Added session timeout.
67 * Revision 1.9 1995/06/05 10:53:31 quinn
68 * Added a better SCAN.
70 * Revision 1.8 1995/05/16 08:51:01 quinn
71 * License, documentation, and memory fixes
73 * Revision 1.7 1995/03/27 15:02:01 quinn
74 * Added some includes for better portability
76 * Revision 1.6 1995/03/27 08:34:21 quinn
77 * Added dynamic server functionality.
78 * Released bindings to session.c (is now redundant)
80 * Revision 1.5 1995/03/15 08:37:41 quinn
81 * Now we're pretty much set for nonblocking I/O.
83 * Revision 1.4 1995/03/14 16:59:48 quinn
86 * Revision 1.3 1995/03/14 11:30:14 quinn
89 * Revision 1.2 1995/03/14 10:27:59 quinn
90 * More work on demo server.
92 * Revision 1.1 1995/03/10 18:22:44 quinn
93 * The rudiments of an asynchronous server.
110 #include <comstack.h>
114 #include <statserv.h>
116 IOCHAN iochan_create(int fd, IOC_CALLBACK cb, int flags)
120 if (!(new_iochan = (IOCHAN)xmalloc(sizeof(*new_iochan))))
122 new_iochan->destroyed = 0;
124 new_iochan->flags = flags;
125 new_iochan->fun = cb;
126 new_iochan->force_event = 0;
127 new_iochan->last_event = new_iochan->max_idle = 0;
128 new_iochan->next = NULL;
132 int event_loop(IOCHAN *iochans)
134 do /* loop as long as there are active associations to process */
137 fd_set in, out, except;
139 static struct timeval nullto = {0, 0}, to;
140 struct timeval *timeout;
145 timeout = &to; /* hang on select */
149 for (p = *iochans; p; p = p->next)
152 timeout = &nullto; /* polling select */
153 if (p->flags & EVENT_INPUT)
155 if (p->flags & EVENT_OUTPUT)
157 if (p->flags & EVENT_EXCEPT)
158 FD_SET(p->fd, &except);
162 if ((res = select(max + 1, &in, &out, &except, timeout)) < 0)
168 /* Destroy the first member in the chain, and try again */
169 association *assoc = (association *)iochan_getdata(*iochans);
170 COMSTACK conn = assoc->client_link;
173 destroy_association(assoc);
174 iochan_destroy(*iochans);
175 yaz_log(LOG_DEBUG, "error select, destroying iochan %p",
179 for (p = *iochans; p; p = p->next)
181 int force_event = p->force_event;
182 time_t now = time(0);
185 if (!p->destroyed && (FD_ISSET(p->fd, &in) ||
186 force_event == EVENT_INPUT))
189 (*p->fun)(p, EVENT_INPUT);
191 if (!p->destroyed && (FD_ISSET(p->fd, &out) ||
192 force_event == EVENT_OUTPUT))
195 (*p->fun)(p, EVENT_OUTPUT);
197 if (!p->destroyed && (FD_ISSET(p->fd, &except) ||
198 force_event == EVENT_EXCEPT))
201 (*p->fun)(p, EVENT_EXCEPT);
203 if (!p->destroyed && ((p->max_idle && now - p->last_event >
204 p->max_idle) || force_event == EVENT_TIMEOUT))
207 (*p->fun)(p, EVENT_TIMEOUT);
210 for (p = *iochans; p; p = nextp)
218 /* We need to inform the threadlist that this channel has been destroyed */
221 /* Now reset the pointers */
226 for (pr = *iochans; pr; pr = pr->next)
229 assert(pr); /* grave error if it weren't there */