2 * Copyright (c) 1995, the EUROPAGATE consortium (see below).
4 * The EUROPAGATE consortium members are:
6 * University College Dublin
7 * Danmarks Teknologiske Videnscenter
8 * An Chomhairle Leabharlanna
9 * Consejo Superior de Investigaciones Cientificas
11 * Permission to use, copy, modify, distribute, and sell this software and
12 * its documentation, in whole or in part, for any purpose, is hereby granted,
15 * 1. This copyright and permission notice appear in all copies of the
16 * software and its documentation. Notices of copyright or attribution
17 * which appear at the beginning of any file must remain unchanged.
19 * 2. The names of EUROPAGATE or the project partners may not be used to
20 * endorse or promote products derived from this software without specific
21 * prior written permission.
23 * 3. Users of this software (implementors and gateway operators) agree to
24 * inform the EUROPAGATE consortium of their use of the software. This
25 * information will be used to evaluate the EUROPAGATE project and the
26 * software, and to plan further developments. The consortium may use
27 * the information in later publications.
29 * 4. Users of this software agree to make their best efforts, when
30 * documenting their use of the software, to acknowledge the EUROPAGATE
31 * consortium, and the role played by the software in their work.
33 * THIS SOFTWARE IS PROVIDED "AS IS" AND WITHOUT WARRANTY OF ANY KIND,
34 * EXPRESS, IMPLIED, OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
35 * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
36 * IN NO EVENT SHALL THE EUROPAGATE CONSORTIUM OR ITS MEMBERS BE LIABLE
37 * FOR ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF
38 * ANY KIND, OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA
39 * OR PROFITS, WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND
40 * ON ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
41 * USE OR PERFORMANCE OF THIS SOFTWARE.
44 * Revision 1.3 1995/10/30 17:35:18 adam
45 * New function zwait that waits for a variable change - due to i/o events
46 * that invoke callback routines.
48 * Revision 1.2 1995/10/27 17:30:16 adam
49 * First search request/response that works.
51 * Revision 1.1 1995/10/27 15:12:08 adam
52 * IrTcl incorporated in the gateway.
53 * Better separation of script types.
54 * Z39.50 gateway scripts entered.
62 #include <sys/types.h>
64 #include <sys/select.h>
73 static void *do_create (WCLIENT wcl, void *args);
74 static int do_exec (const char *fname, char *parms, void *mydata);
76 static struct w_interp_type w_interp_t = {
82 W_Interp_Type w_interp_irtcl = &w_interp_t;
85 static char *mod = "wirtcl";
94 static int events (struct tcl_info *p, char *waitVar);
96 static int proc_zwait_invoke (ClientData clientData, Tcl_Interp *interp,
97 int argc, char **argv)
99 struct tcl_info *p = (struct tcl_info*) clientData;
109 /* select(2) callbacks */
111 void (*r_handle)(ClientData);
112 void (*w_handle)(ClientData);
113 void (*x_handle)(ClientData);
116 #define MAX_CALLBACK 200
118 static struct callback callback_table[MAX_CALLBACK];
119 static int max_fd = 3; /* don't worry: it will grow... */
121 static void *do_create (WCLIENT wcl, void *args)
126 if (!(p = malloc (sizeof(*p))))
128 gw_log (GW_LOG_FATAL|GW_LOG_ERRNO, mod, "malloc: irtcl_info");
131 if (!(p->w_interp = w_interp_create (w_interp_tcl, wcl, NULL)))
133 gw_log (GW_LOG_FATAL, mod, "Cannot make Tcl_Interp");
137 p->interp = w_interp_tcl_get (p->w_interp);
138 if (Irtcl_Init(p->interp) == TCL_ERROR)
140 gw_log (GW_LOG_FATAL, mod, "Cannot make Irtcl_Interp");
143 /* initialize irtcl */
144 Tcl_CreateCommand (p->interp, "zwait", proc_zwait_invoke, p, NULL);
145 for (i=0; i<MAX_CALLBACK; i++)
147 callback_table[i].r_handle = NULL;
148 callback_table[i].w_handle = NULL;
149 callback_table[i].x_handle = NULL;
155 static int do_exec (const char *fname, char *parms, void *mydata)
157 struct tcl_info *p = mydata;
159 if ((r = w_interp_exec (p->w_interp, fname, parms)))
165 static int events (struct tcl_info *p, char *waitVar)
167 int r, i, min_fd = 0;
170 static fd_set fdset_tcl_r;
171 static fd_set fdset_tcl_w;
172 static fd_set fdset_tcl_x;
175 if ((cp = Tcl_GetVar (p->interp, waitVar, 0)))
177 waitVarVal = malloc (strlen(cp)+1);
178 strcpy (waitVarVal, cp);
182 gw_log (GW_LOG_WARN, mod, "Variable %s doesn't exist", waitVar);
185 gw_log (GW_LOG_DEBUG, mod, "Waiting for variable %s=%s",
186 waitVar, waitVarVal);
189 if (!(cp = Tcl_GetVar (p->interp, waitVar, 0)) ||
190 strcmp (cp, waitVarVal))
195 FD_ZERO (&fdset_tcl_r);
196 FD_ZERO (&fdset_tcl_w);
197 FD_ZERO (&fdset_tcl_x);
199 for (r=0, i=min_fd; i<=max_fd; i++)
201 if (callback_table[i].w_handle)
203 FD_SET (i, &fdset_tcl_w);
206 if (callback_table[i].r_handle)
208 FD_SET (i, &fdset_tcl_r);
211 if (callback_table[i].x_handle)
213 FD_SET (i, &fdset_tcl_x);
219 if ((r = select(max_fd+1, &fdset_tcl_r, &fdset_tcl_w,
220 &fdset_tcl_x, 0)) < 0)
227 for (i=min_fd; i<=max_fd; i++)
229 if (FD_ISSET (i, &fdset_tcl_r))
231 assert (callback_table[i].r_handle);
232 (*callback_table[i].r_handle) (callback_table[i].obj);
234 if (FD_ISSET (i, &fdset_tcl_w))
236 assert (callback_table[i].w_handle);
237 (*callback_table[i].w_handle) (callback_table[i].obj);
239 if (FD_ISSET (i, &fdset_tcl_x))
241 assert (callback_table[i].x_handle);
242 (*callback_table[i].x_handle) (callback_table[i].obj);
250 void ir_select_add (int fd, void *obj)
252 callback_table[fd].obj = obj;
253 callback_table[fd].r_handle = ir_select_read;
254 callback_table[fd].w_handle = NULL;
255 callback_table[fd].x_handle = NULL;
260 void ir_select_add_write (int fd, void *obj)
262 callback_table[fd].w_handle = ir_select_write;
267 void ir_select_remove_write (int fd, void *obj)
269 callback_table[fd].w_handle = NULL;
272 void ir_select_remove (int fd, void *obj)
274 callback_table[fd].r_handle = NULL;
275 callback_table[fd].w_handle = NULL;
276 callback_table[fd].x_handle = NULL;