code.delx.au - pulseaudio/blob - src/pdispatch.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <assert.h>
   4 #include "pdispatch.h"
   5 #include "protocol-native-spec.h"
   6
   7 static const char *command_names[PA_COMMAND_MAX] = {
   8     [PA_COMMAND_ERROR] = "ERROR",
   9     [PA_COMMAND_TIMEOUT] = "TIMEOUT",
  10     [PA_COMMAND_REPLY] = "REPLY",
  11     [PA_COMMAND_CREATE_PLAYBACK_STREAM] = "CREATE_PLAYBACK_STREAM",
  12     [PA_COMMAND_DELETE_PLAYBACK_STREAM] = "DELETE_PLAYBACK_STREAM",
  13     [PA_COMMAND_CREATE_RECORD_STREAM] = "CREATE_RECORD_STREAM",
  14     [PA_COMMAND_DELETE_RECORD_STREAM] = "DELETE_RECORD_STREAM",
  15     [PA_COMMAND_AUTH] = "AUTH",
  16     [PA_COMMAND_REQUEST] = "REQUEST",
  17     [PA_COMMAND_EXIT] = "EXIT",
  18     [PA_COMMAND_SET_NAME] = "SET_NAME",
  19     [PA_COMMAND_LOOKUP_SINK] = "LOOKUP_SINK",
  20     [PA_COMMAND_LOOKUP_SOURCE] = "LOOKUP_SOURCE",
  21     [PA_COMMAND_DRAIN_PLAYBACK_STREAM] = "DRAIN_PLAYBACK_STREAM",
  22 };
  23
  24 struct reply_info {
  25     struct pa_pdispatch *pdispatch;
  26     struct reply_info *next, *previous;
  27     void (*callback)(struct pa_pdispatch *pd, uint32_t command, uint32_t tag, struct pa_tagstruct *t, void *userdata);
  28     void *userdata;
  29     uint32_t tag;
  30     void *mainloop_timeout;
  31     int callback_is_running;
  32 };
  33
  34 struct pa_pdispatch {
  35     struct pa_mainloop_api *mainloop;
  36     const struct pa_pdispatch_command *command_table;
  37     unsigned n_commands;
  38     struct reply_info *replies;
  39     void (*drain_callback)(struct pa_pdispatch *pd, void *userdata);
  40     void *drain_userdata;
  41     int in_use, shall_free;
  42 };
  43
  44 static void reply_info_free(struct reply_info *r) {
  45     assert(r && r->pdispatch && r->pdispatch->mainloop);
  46
  47     if (r->pdispatch)
  48         r->pdispatch->mainloop->cancel_time(r->pdispatch->mainloop, r->mainloop_timeout);
  49
  50     if (r->previous)
  51         r->previous->next = r->next;
  52     else
  53         r->pdispatch->replies = r->next;
  54
  55     if (r->next)
  56         r->next->previous = r->previous;
  57
  58     free(r);
  59 }
  60
  61 struct pa_pdispatch* pa_pdispatch_new(struct pa_mainloop_api *mainloop, const struct pa_pdispatch_command*table, unsigned entries) {
  62     struct pa_pdispatch *pd;
  63     assert(mainloop);
  64
  65     assert((entries && table) || (!entries && !table));
  66
  67     pd = malloc(sizeof(struct pa_pdispatch));
  68     assert(pd);
  69     pd->mainloop = mainloop;
  70     pd->command_table = table;
  71     pd->n_commands = entries;
  72     pd->replies = NULL;
  73     pd->drain_callback = NULL;
  74     pd->drain_userdata = NULL;
  75
  76     pd->in_use = pd->shall_free = 0;
  77     return pd;
  78 }
  79
  80 void pa_pdispatch_free(struct pa_pdispatch *pd) {
  81     assert(pd);
  82
  83     if (pd->in_use) {
  84         pd->shall_free = 1;
  85         return;
  86     }
  87
  88     while (pd->replies)
  89         reply_info_free(pd->replies);
  90     free(pd);
  91 }
  92
  93 int pa_pdispatch_run(struct pa_pdispatch *pd, struct pa_packet*packet, void *userdata) {
  94     uint32_t tag, command;
  95     struct pa_tagstruct *ts = NULL;
  96     int ret = -1;
  97     assert(pd && packet && packet->data && !pd->in_use);
  98
  99     if (packet->length <= 8)
 100         goto finish;
 101
 102     ts = pa_tagstruct_new(packet->data, packet->length);
 103     assert(ts);
 104
 105     if (pa_tagstruct_getu32(ts, &command) < 0 ||
 106         pa_tagstruct_getu32(ts, &tag) < 0)
 107         goto finish;
 108
 109     /*fprintf(stderr, __FILE__": Recieved opcode <%s>\n", command_names[command]);*/
 110
 111     if (command == PA_COMMAND_ERROR || command == PA_COMMAND_REPLY) {
 112         struct reply_info *r;
 113
 114         for (r = pd->replies; r; r = r->next)
 115             if (r->tag == tag)
 116                 break;
 117
 118         if (r) {
 119             pd->in_use = r->callback_is_running = 1;
 120             assert(r->callback);
 121             r->callback(r->pdispatch, command, tag, ts, r->userdata);
 122             pd->in_use = r->callback_is_running = 0;
 123             reply_info_free(r);
 124
 125             if (pd->shall_free)
 126                 pa_pdispatch_free(pd);
 127             else {
 128                 if (pd->drain_callback && !pa_pdispatch_is_pending(pd))
 129                     pd->drain_callback(pd, pd->drain_userdata);
 130             }
 131         }
 132
 133     } else if (pd->command_table && command < pd->n_commands) {
 134         const struct pa_pdispatch_command *c = pd->command_table+command;
 135
 136         if (c->proc)
 137             c->proc(pd, command, tag, ts, userdata);
 138     } else
 139         goto finish;
 140
 141     ret = 0;
 142
 143 finish:
 144     if (ts)
 145         pa_tagstruct_free(ts);
 146
 147     return ret;
 148 }
 149
 150 static void timeout_callback(struct pa_mainloop_api*m, void *id, const struct timeval *tv, void *userdata) {
 151     struct reply_info*r = userdata;
 152     assert (r && r->mainloop_timeout == id && r->pdispatch && r->pdispatch->mainloop == m && r->callback);
 153
 154     r->callback(r->pdispatch, PA_COMMAND_TIMEOUT, r->tag, NULL, r->userdata);
 155     reply_info_free(r);
 156
 157     if (r->pdispatch->drain_callback && !pa_pdispatch_is_pending(r->pdispatch))
 158         r->pdispatch->drain_callback(r->pdispatch, r->pdispatch->drain_userdata);
 159 }
 160
 161 void pa_pdispatch_register_reply(struct pa_pdispatch *pd, uint32_t tag, int timeout, void (*cb)(struct pa_pdispatch *pd, uint32_t command, uint32_t tag, struct pa_tagstruct *t, void *userdata), void *userdata) {
 162     struct reply_info *r;
 163     struct timeval tv;
 164     assert(pd && cb);
 165
 166     r = malloc(sizeof(struct reply_info));
 167     assert(r);
 168     r->pdispatch = pd;
 169     r->callback = cb;
 170     r->userdata = userdata;
 171     r->tag = tag;
 172     r->callback_is_running = 0;
 173
 174     gettimeofday(&tv, NULL);
 175     tv.tv_sec += timeout;
 176
 177     r->mainloop_timeout = pd->mainloop->source_time(pd->mainloop, &tv, timeout_callback, r);
 178     assert(r->mainloop_timeout);
 179
 180     r->previous = NULL;
 181     r->next = pd->replies;
 182     if (r->next)
 183         r->next->previous = r;
 184     pd->replies = r;
 185 }
 186
 187 int pa_pdispatch_is_pending(struct pa_pdispatch *pd) {
 188     assert(pd);
 189
 190     return !!pd->replies;
 191 }
 192
 193 void pa_pdispatch_set_drain_callback(struct pa_pdispatch *pd, void (*cb)(struct pa_pdispatch *pd, void *userdata), void *userdata) {
 194     assert(pd);
 195     assert(!cb || pa_pdispatch_is_pending(pd));
 196
 197     pd->drain_callback = cb;
 198     pd->drain_userdata = userdata;
 199 }
 200
 201 void pa_pdispatch_unregister_reply(struct pa_pdispatch *pd, void *userdata) {
 202     struct reply_info *r, *n;
 203     assert(pd);
 204
 205     for (r = pd->replies; r; r = n) {
 206         n = r->next;
 207
 208         if (!r->callback_is_running && r->userdata == userdata) /* when this item's callback is currently running it is destroyed anyway in the very near future */
 209             reply_info_free(r);
 210     }
 211 }