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00028 #include "asterisk.h"
00029
00030 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 163515 $")
00031
00032 #include <sys/time.h>
00033 #include <signal.h>
00034
00035 #include "asterisk/_private.h"
00036
00037 #include "asterisk/pbx.h"
00038 #include "asterisk/frame.h"
00039 #include "asterisk/sched.h"
00040 #include "asterisk/channel.h"
00041 #include "asterisk/file.h"
00042 #include "asterisk/translate.h"
00043 #include "asterisk/manager.h"
00044 #include "asterisk/chanvars.h"
00045 #include "asterisk/linkedlists.h"
00046 #include "asterisk/indications.h"
00047 #include "asterisk/lock.h"
00048 #include "asterisk/utils.h"
00049
00050 #define MAX_AUTOMONS 1500
00051
00052 struct asent {
00053 struct ast_channel *chan;
00054
00055
00056
00057 unsigned int use_count;
00058 unsigned int orig_end_dtmf_flag:1;
00059
00060
00061
00062 AST_LIST_HEAD_NOLOCK(, ast_frame) deferred_frames;
00063 AST_LIST_ENTRY(asent) list;
00064 };
00065
00066 static AST_LIST_HEAD_STATIC(aslist, asent);
00067 static ast_cond_t as_cond;
00068
00069 static pthread_t asthread = AST_PTHREADT_NULL;
00070
00071 static int as_chan_list_state;
00072
00073 static void *autoservice_run(void *ign)
00074 {
00075 for (;;) {
00076 struct ast_channel *mons[MAX_AUTOMONS];
00077 struct asent *ents[MAX_AUTOMONS];
00078 struct ast_channel *chan;
00079 struct asent *as;
00080 int i, x = 0, ms = 50;
00081 struct ast_frame *f = NULL;
00082 struct ast_frame *defer_frame = NULL;
00083
00084 AST_LIST_LOCK(&aslist);
00085
00086
00087
00088 as_chan_list_state++;
00089
00090 if (AST_LIST_EMPTY(&aslist)) {
00091 ast_cond_wait(&as_cond, &aslist.lock);
00092 }
00093
00094 AST_LIST_TRAVERSE(&aslist, as, list) {
00095 if (!ast_check_hangup(as->chan)) {
00096 if (x < MAX_AUTOMONS) {
00097 ents[x] = as;
00098 mons[x++] = as->chan;
00099 } else {
00100 ast_log(LOG_WARNING, "Exceeded maximum number of automatic monitoring events. Fix autoservice.c\n");
00101 }
00102 }
00103 }
00104
00105 AST_LIST_UNLOCK(&aslist);
00106
00107 if (!x) {
00108 continue;
00109 }
00110
00111 chan = ast_waitfor_n(mons, x, &ms);
00112 if (!chan) {
00113 continue;
00114 }
00115
00116 f = ast_read(chan);
00117
00118 if (!f) {
00119 struct ast_frame hangup_frame = { 0, };
00120
00121
00122
00123
00124
00125
00126 hangup_frame.frametype = AST_FRAME_CONTROL;
00127 hangup_frame.subclass = AST_CONTROL_HANGUP;
00128
00129 defer_frame = &hangup_frame;
00130 } else {
00131
00132
00133
00134
00135
00136 switch (f->frametype) {
00137
00138 case AST_FRAME_DTMF_END:
00139 case AST_FRAME_CONTROL:
00140 case AST_FRAME_TEXT:
00141 case AST_FRAME_IMAGE:
00142 case AST_FRAME_HTML:
00143 defer_frame = f;
00144 break;
00145
00146
00147 case AST_FRAME_DTMF_BEGIN:
00148 case AST_FRAME_VOICE:
00149 case AST_FRAME_VIDEO:
00150 case AST_FRAME_NULL:
00151 case AST_FRAME_IAX:
00152 case AST_FRAME_CNG:
00153 case AST_FRAME_MODEM:
00154 break;
00155 }
00156 }
00157
00158 if (defer_frame) {
00159 for (i = 0; i < x; i++) {
00160 struct ast_frame *dup_f;
00161
00162 if (mons[i] != chan) {
00163 continue;
00164 }
00165
00166 if ((dup_f = ast_frdup(defer_frame))) {
00167 AST_LIST_INSERT_HEAD(&ents[i]->deferred_frames, dup_f, frame_list);
00168 }
00169
00170 break;
00171 }
00172 }
00173
00174 if (f) {
00175 ast_frfree(f);
00176 }
00177 }
00178
00179 asthread = AST_PTHREADT_NULL;
00180
00181 return NULL;
00182 }
00183
00184 int ast_autoservice_start(struct ast_channel *chan)
00185 {
00186 int res = 0;
00187 struct asent *as;
00188
00189 AST_LIST_LOCK(&aslist);
00190 AST_LIST_TRAVERSE(&aslist, as, list) {
00191 if (as->chan == chan) {
00192 as->use_count++;
00193 break;
00194 }
00195 }
00196 AST_LIST_UNLOCK(&aslist);
00197
00198 if (as) {
00199
00200 return 0;
00201 }
00202
00203 if (!(as = ast_calloc(1, sizeof(*as))))
00204 return -1;
00205
00206
00207 as->chan = chan;
00208 as->use_count = 1;
00209
00210 ast_channel_lock(chan);
00211 as->orig_end_dtmf_flag = ast_test_flag(chan, AST_FLAG_END_DTMF_ONLY) ? 1 : 0;
00212 if (!as->orig_end_dtmf_flag)
00213 ast_set_flag(chan, AST_FLAG_END_DTMF_ONLY);
00214 ast_channel_unlock(chan);
00215
00216 AST_LIST_LOCK(&aslist);
00217
00218 if (AST_LIST_EMPTY(&aslist) && asthread != AST_PTHREADT_NULL) {
00219 ast_cond_signal(&as_cond);
00220 }
00221
00222 AST_LIST_INSERT_HEAD(&aslist, as, list);
00223
00224 if (asthread == AST_PTHREADT_NULL) {
00225 if (ast_pthread_create_background(&asthread, NULL, autoservice_run, NULL)) {
00226 ast_log(LOG_WARNING, "Unable to create autoservice thread :(\n");
00227
00228
00229 AST_LIST_REMOVE(&aslist, as, list);
00230 free(as);
00231 asthread = AST_PTHREADT_NULL;
00232 res = -1;
00233 } else {
00234 pthread_kill(asthread, SIGURG);
00235 }
00236 }
00237
00238 AST_LIST_UNLOCK(&aslist);
00239
00240 return res;
00241 }
00242
00243 int ast_autoservice_stop(struct ast_channel *chan)
00244 {
00245 int res = -1;
00246 struct asent *as, *removed = NULL;
00247 struct ast_frame *f;
00248 int chan_list_state;
00249
00250 AST_LIST_LOCK(&aslist);
00251
00252
00253
00254
00255
00256 chan_list_state = as_chan_list_state;
00257
00258
00259
00260 AST_LIST_TRAVERSE_SAFE_BEGIN(&aslist, as, list) {
00261 if (as->chan == chan) {
00262 as->use_count--;
00263 if (as->use_count < 1) {
00264 AST_LIST_REMOVE_CURRENT(list);
00265 removed = as;
00266 }
00267 break;
00268 }
00269 }
00270 AST_LIST_TRAVERSE_SAFE_END;
00271
00272 if (removed && asthread != AST_PTHREADT_NULL) {
00273 pthread_kill(asthread, SIGURG);
00274 }
00275
00276 AST_LIST_UNLOCK(&aslist);
00277
00278 if (!removed) {
00279 return 0;
00280 }
00281
00282
00283 while (chan_list_state == as_chan_list_state) {
00284 usleep(1000);
00285 }
00286
00287
00288
00289
00290 if (!chan->_softhangup) {
00291 res = 0;
00292 }
00293
00294 if (!as->orig_end_dtmf_flag) {
00295 ast_clear_flag(chan, AST_FLAG_END_DTMF_ONLY);
00296 }
00297
00298 ast_channel_lock(chan);
00299 while ((f = AST_LIST_REMOVE_HEAD(&as->deferred_frames, frame_list))) {
00300 ast_queue_frame_head(chan, f);
00301 ast_frfree(f);
00302 }
00303 ast_channel_unlock(chan);
00304
00305 free(as);
00306
00307 return res;
00308 }
00309
00310 void ast_autoservice_init(void)
00311 {
00312 ast_cond_init(&as_cond, NULL);
00313 }