2 * Copyright (c) 1995-1999, Index Data
3 * See the file LICENSE for details.
4 * Sebastian Hammer, Adam Dickmeiss
7 * Revision 1.29 1999-11-30 13:47:12 adam
8 * Improved installation. Moved header files to include/yaz.
10 * Revision 1.28 1999/08/27 09:40:32 adam
11 * Renamed logf function to yaz_log. Removed VC++ project files.
13 * Revision 1.27 1999/02/02 13:57:34 adam
14 * Uses preprocessor define WIN32 instead of WINDOWS to build code
15 * for Microsoft WIN32.
17 * Revision 1.26 1998/02/11 11:53:35 adam
18 * Changed code so that it compiles as C++.
20 * Revision 1.25 1998/01/29 13:30:23 adam
21 * Better event handle system for NT/Unix.
23 * Revision 1.24 1997/09/04 14:19:13 adam
26 * Revision 1.23 1997/09/01 08:52:59 adam
27 * New windows NT/95 port using MSV5.0. The test server 'ztest' was
28 * moved a separate directory. MSV5.0 project server.dsp created.
29 * As an option, the server can now operate as an NT service.
31 * Revision 1.22 1996/07/06 19:58:35 quinn
32 * System headerfiles gathered in yconfig
34 * Revision 1.21 1996/02/21 12:55:51 quinn
37 * Revision 1.20 1996/02/21 12:52:55 quinn
40 * Revision 1.19 1995/12/05 11:17:30 quinn
41 * Moved some paranthesises around. Sigh.
43 * Revision 1.18 1995/11/13 09:27:41 quinn
44 * Fiddling with the variant stuff.
46 * Revision 1.17 1995/11/07 12:37:44 quinn
47 * Added support for forcing TIMEOUT event.
49 * Revision 1.16 1995/11/01 13:54:56 quinn
52 * Revision 1.15 1995/09/15 14:44:15 quinn
53 * *** empty log message ***
55 * Revision 1.14 1995/08/29 14:44:50 quinn
58 * Revision 1.13 1995/08/29 11:17:56 quinn
59 * Added code to receive close
61 * Revision 1.12 1995/08/29 10:41:18 quinn
64 * Revision 1.11 1995/06/19 12:39:09 quinn
65 * Fixed bug in timeout code. Added BER dumper.
67 * Revision 1.10 1995/06/16 10:31:33 quinn
68 * Added session timeout.
70 * Revision 1.9 1995/06/05 10:53:31 quinn
71 * Added a better SCAN.
73 * Revision 1.8 1995/05/16 08:51:01 quinn
74 * License, documentation, and memory fixes
76 * Revision 1.7 1995/03/27 15:02:01 quinn
77 * Added some includes for better portability
79 * Revision 1.6 1995/03/27 08:34:21 quinn
80 * Added dynamic server functionality.
81 * Released bindings to session.c (is now redundant)
83 * Revision 1.5 1995/03/15 08:37:41 quinn
84 * Now we're pretty much set for nonblocking I/O.
86 * Revision 1.4 1995/03/14 16:59:48 quinn
89 * Revision 1.3 1995/03/14 11:30:14 quinn
92 * Revision 1.2 1995/03/14 10:27:59 quinn
93 * More work on demo server.
95 * Revision 1.1 1995/03/10 18:22:44 quinn
96 * The rudiments of an asynchronous server.
111 #include <yaz/yconfig.h>
113 #include <yaz/comstack.h>
114 #include <yaz/xmalloc.h>
117 #include <yaz/statserv.h>
119 IOCHAN iochan_create(int fd, IOC_CALLBACK cb, int flags)
123 if (!(new_iochan = (IOCHAN)xmalloc(sizeof(*new_iochan))))
125 new_iochan->destroyed = 0;
127 new_iochan->flags = flags;
128 new_iochan->fun = cb;
129 new_iochan->force_event = 0;
130 new_iochan->last_event = new_iochan->max_idle = 0;
131 new_iochan->next = NULL;
135 int event_loop(IOCHAN *iochans)
137 do /* loop as long as there are active associations to process */
140 fd_set in, out, except;
142 static struct timeval nullto = {0, 0}, to;
143 struct timeval *timeout;
148 timeout = &to; /* hang on select */
152 for (p = *iochans; p; p = p->next)
155 timeout = &nullto; /* polling select */
156 if (p->flags & EVENT_INPUT)
158 if (p->flags & EVENT_OUTPUT)
160 if (p->flags & EVENT_EXCEPT)
161 FD_SET(p->fd, &except);
165 if ((res = select(max + 1, &in, &out, &except, timeout)) < 0)
171 /* Destroy the first member in the chain, and try again */
172 association *assoc = (association *)iochan_getdata(*iochans);
173 COMSTACK conn = assoc->client_link;
176 destroy_association(assoc);
177 iochan_destroy(*iochans);
178 yaz_log(LOG_DEBUG, "error select, destroying iochan %p",
182 for (p = *iochans; p; p = p->next)
184 int force_event = p->force_event;
185 time_t now = time(0);
188 if (!p->destroyed && (FD_ISSET(p->fd, &in) ||
189 force_event == EVENT_INPUT))
192 (*p->fun)(p, EVENT_INPUT);
194 if (!p->destroyed && (FD_ISSET(p->fd, &out) ||
195 force_event == EVENT_OUTPUT))
198 (*p->fun)(p, EVENT_OUTPUT);
200 if (!p->destroyed && (FD_ISSET(p->fd, &except) ||
201 force_event == EVENT_EXCEPT))
204 (*p->fun)(p, EVENT_EXCEPT);
206 if (!p->destroyed && ((p->max_idle && now - p->last_event >
207 p->max_idle) || force_event == EVENT_TIMEOUT))
210 (*p->fun)(p, EVENT_TIMEOUT);
213 for (p = *iochans; p; p = nextp)
221 /* We need to inform the threadlist that this channel has been destroyed */
224 /* Now reset the pointers */
229 for (pr = *iochans; pr; pr = pr->next)
232 assert(pr); /* grave error if it weren't there */