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00028 #include "asterisk.h"
00029
00030 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 163448 $")
00031
00032 #include <stdio.h>
00033 #include <stdlib.h>
00034 #include <string.h>
00035 #include <sys/time.h>
00036 #include <signal.h>
00037 #include <errno.h>
00038 #include <unistd.h>
00039
00040 #include "asterisk/pbx.h"
00041 #include "asterisk/frame.h"
00042 #include "asterisk/sched.h"
00043 #include "asterisk/options.h"
00044 #include "asterisk/channel.h"
00045 #include "asterisk/logger.h"
00046 #include "asterisk/file.h"
00047 #include "asterisk/translate.h"
00048 #include "asterisk/manager.h"
00049 #include "asterisk/chanvars.h"
00050 #include "asterisk/linkedlists.h"
00051 #include "asterisk/indications.h"
00052 #include "asterisk/lock.h"
00053 #include "asterisk/utils.h"
00054
00055 #define MAX_AUTOMONS 1500
00056
00057 struct asent {
00058 struct ast_channel *chan;
00059
00060
00061
00062 unsigned int use_count;
00063 unsigned int orig_end_dtmf_flag:1;
00064
00065
00066
00067 AST_LIST_HEAD_NOLOCK(, ast_frame) deferred_frames;
00068 AST_LIST_ENTRY(asent) list;
00069 };
00070
00071 static AST_LIST_HEAD_STATIC(aslist, asent);
00072 static ast_cond_t as_cond;
00073
00074 static pthread_t asthread = AST_PTHREADT_NULL;
00075
00076 static int as_chan_list_state;
00077
00078 static void *autoservice_run(void *ign)
00079 {
00080 for (;;) {
00081 struct ast_channel *mons[MAX_AUTOMONS];
00082 struct asent *ents[MAX_AUTOMONS];
00083 struct ast_channel *chan;
00084 struct asent *as;
00085 int i, x = 0, ms = 50;
00086 struct ast_frame *f = NULL;
00087 struct ast_frame *defer_frame = NULL;
00088
00089 AST_LIST_LOCK(&aslist);
00090
00091
00092
00093 as_chan_list_state++;
00094
00095 if (AST_LIST_EMPTY(&aslist)) {
00096 ast_cond_wait(&as_cond, &aslist.lock);
00097 }
00098
00099 AST_LIST_TRAVERSE(&aslist, as, list) {
00100 if (!as->chan->_softhangup) {
00101 if (x < MAX_AUTOMONS) {
00102 ents[x] = as;
00103 mons[x++] = as->chan;
00104 } else {
00105 ast_log(LOG_WARNING, "Exceeded maximum number of automatic monitoring events. Fix autoservice.c\n");
00106 }
00107 }
00108 }
00109
00110 AST_LIST_UNLOCK(&aslist);
00111
00112 if (!x) {
00113 continue;
00114 }
00115
00116 chan = ast_waitfor_n(mons, x, &ms);
00117 if (!chan) {
00118 continue;
00119 }
00120
00121 f = ast_read(chan);
00122
00123 if (!f) {
00124 struct ast_frame hangup_frame = { 0, };
00125
00126
00127
00128
00129
00130
00131 hangup_frame.frametype = AST_FRAME_CONTROL;
00132 hangup_frame.subclass = AST_CONTROL_HANGUP;
00133
00134 defer_frame = &hangup_frame;
00135 } else {
00136
00137
00138
00139
00140
00141 switch (f->frametype) {
00142
00143 case AST_FRAME_DTMF_END:
00144 case AST_FRAME_CONTROL:
00145 case AST_FRAME_TEXT:
00146 case AST_FRAME_IMAGE:
00147 case AST_FRAME_HTML:
00148 defer_frame = f;
00149 break;
00150
00151
00152 case AST_FRAME_DTMF_BEGIN:
00153 case AST_FRAME_VOICE:
00154 case AST_FRAME_VIDEO:
00155 case AST_FRAME_NULL:
00156 case AST_FRAME_IAX:
00157 case AST_FRAME_CNG:
00158 case AST_FRAME_MODEM:
00159 break;
00160 }
00161 }
00162
00163 if (defer_frame) {
00164 for (i = 0; i < x; i++) {
00165 struct ast_frame *dup_f;
00166
00167 if (mons[i] != chan) {
00168 continue;
00169 }
00170
00171 if ((dup_f = ast_frdup(defer_frame))) {
00172 AST_LIST_INSERT_HEAD(&ents[i]->deferred_frames, dup_f, frame_list);
00173 }
00174
00175 break;
00176 }
00177 }
00178
00179 if (f) {
00180 ast_frfree(f);
00181 }
00182 }
00183
00184 asthread = AST_PTHREADT_NULL;
00185
00186 return NULL;
00187 }
00188
00189 int ast_autoservice_start(struct ast_channel *chan)
00190 {
00191 int res = 0;
00192 struct asent *as;
00193
00194
00195 AST_LIST_LOCK(&aslist);
00196 AST_LIST_TRAVERSE(&aslist, as, list) {
00197 if (as->chan == chan) {
00198 as->use_count++;
00199 break;
00200 }
00201 }
00202 AST_LIST_UNLOCK(&aslist);
00203
00204 if (as) {
00205
00206 return 0;
00207 }
00208
00209 if (!(as = ast_calloc(1, sizeof(*as))))
00210 return -1;
00211
00212
00213 as->chan = chan;
00214 as->use_count = 1;
00215
00216 ast_channel_lock(chan);
00217 as->orig_end_dtmf_flag = ast_test_flag(chan, AST_FLAG_END_DTMF_ONLY) ? 1 : 0;
00218 if (!as->orig_end_dtmf_flag)
00219 ast_set_flag(chan, AST_FLAG_END_DTMF_ONLY);
00220 ast_channel_unlock(chan);
00221
00222 AST_LIST_LOCK(&aslist);
00223
00224 if (AST_LIST_EMPTY(&aslist) && asthread != AST_PTHREADT_NULL) {
00225 ast_cond_signal(&as_cond);
00226 }
00227
00228 AST_LIST_INSERT_HEAD(&aslist, as, list);
00229
00230 if (asthread == AST_PTHREADT_NULL) {
00231 if (ast_pthread_create_background(&asthread, NULL, autoservice_run, NULL)) {
00232 ast_log(LOG_WARNING, "Unable to create autoservice thread :(\n");
00233
00234
00235 AST_LIST_REMOVE(&aslist, as, list);
00236 free(as);
00237 asthread = AST_PTHREADT_NULL;
00238 res = -1;
00239 } else {
00240 pthread_kill(asthread, SIGURG);
00241 }
00242 }
00243
00244 AST_LIST_UNLOCK(&aslist);
00245
00246 return res;
00247 }
00248
00249 int ast_autoservice_stop(struct ast_channel *chan)
00250 {
00251 int res = -1;
00252 struct asent *as, *removed = NULL;
00253 struct ast_frame *f;
00254 int chan_list_state;
00255
00256 AST_LIST_LOCK(&aslist);
00257
00258
00259
00260
00261
00262 chan_list_state = as_chan_list_state;
00263
00264
00265
00266 AST_LIST_TRAVERSE_SAFE_BEGIN(&aslist, as, list) {
00267 if (as->chan == chan) {
00268 as->use_count--;
00269 if (as->use_count < 1) {
00270 AST_LIST_REMOVE_CURRENT(&aslist, list);
00271 removed = as;
00272 }
00273 break;
00274 }
00275 }
00276 AST_LIST_TRAVERSE_SAFE_END
00277
00278 if (removed && asthread != AST_PTHREADT_NULL) {
00279 pthread_kill(asthread, SIGURG);
00280 }
00281
00282 AST_LIST_UNLOCK(&aslist);
00283
00284 if (!removed) {
00285 return 0;
00286 }
00287
00288
00289 while (chan_list_state == as_chan_list_state) {
00290 usleep(1000);
00291 }
00292
00293
00294
00295
00296 if (!chan->_softhangup) {
00297 res = 0;
00298 }
00299
00300 if (!as->orig_end_dtmf_flag) {
00301 ast_clear_flag(chan, AST_FLAG_END_DTMF_ONLY);
00302 }
00303
00304 ast_channel_lock(chan);
00305 while ((f = AST_LIST_REMOVE_HEAD(&as->deferred_frames, frame_list))) {
00306 ast_queue_frame_head(chan, f);
00307 ast_frfree(f);
00308 }
00309 ast_channel_unlock(chan);
00310
00311 free(as);
00312
00313 return res;
00314 }
00315
00316 void ast_autoservice_init(void)
00317 {
00318 ast_cond_init(&as_cond, NULL);
00319 }