code.delx.au - pulseaudio/blob - src/pulsecore/module.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of PulseAudio.
   5
   6   Copyright 2004-2006 Lennart Poettering
   7   Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
   8
   9   PulseAudio is free software; you can redistribute it and/or modify
  10   it under the terms of the GNU Lesser General Public License as published
  11   by the Free Software Foundation; either version 2 of the License,
  12   or (at your option) any later version.
  13
  14   PulseAudio is distributed in the hope that it will be useful, but
  15   WITHOUT ANY WARRANTY; without even the implied warranty of
  16   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  17   General Public License for more details.
  18
  19   You should have received a copy of the GNU Lesser General Public License
  20   along with PulseAudio; if not, write to the Free Software
  21   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  22   USA.
  23 ***/
  24
  25 #ifdef HAVE_CONFIG_H
  26 #include <config.h>
  27 #endif
  28
  29 #include <limits.h>
  30 #include <stdio.h>
  31 #include <stdlib.h>
  32 #include <assert.h>
  33 #include <string.h>
  34 #include <errno.h>
  35 #include <ctype.h>
  36
  37 #include <pulse/timeval.h>
  38 #include <pulse/xmalloc.h>
  39
  40 #include <pulsecore/core-subscribe.h>
  41 #include <pulsecore/log.h>
  42 #include <pulsecore/core-util.h>
  43
  44 #include "module.h"
  45
  46 #define PA_SYMBOL_INIT "pa__init"
  47 #define PA_SYMBOL_DONE "pa__done"
  48
  49 #define UNLOAD_POLL_TIME 2
  50
  51 /* lt_dlsym() violates ISO C, so confide the breakage into this function to
  52  * avoid warnings. */
  53 typedef void (*fnptr)(void);
  54 static inline fnptr lt_dlsym_fn(lt_dlhandle handle, const char *symbol) {
  55     return (fnptr) (long) lt_dlsym(handle, symbol);
  56 }
  57
  58 static void timeout_callback(pa_mainloop_api *m, pa_time_event*e, PA_GCC_UNUSED const struct timeval *tv, void *userdata) {
  59     pa_core *c = userdata;
  60     struct timeval ntv;
  61     assert(c && c->mainloop == m && c->module_auto_unload_event == e);
  62
  63     pa_module_unload_unused(c);
  64
  65     pa_gettimeofday(&ntv);
  66     ntv.tv_sec += UNLOAD_POLL_TIME;
  67     m->time_restart(e, &ntv);
  68 }
  69
  70 static inline fnptr load_sym(lt_dlhandle handle, const char *module, const char *symbol) {
  71     char *buffer, *ch;
  72     size_t buflen;
  73     fnptr res;
  74
  75     res = lt_dlsym_fn(handle, symbol);
  76     if (res)
  77         return res;
  78
  79     /* As the .la files might have been cleansed from the system, we should
  80      * try with the ltdl prefix as well. */
  81
  82     buflen = strlen(symbol) + strlen(module) + strlen("_LTX_") + 1;
  83     buffer = pa_xmalloc(buflen);
  84     assert(buffer);
  85
  86     strcpy(buffer, module);
  87
  88     for (ch = buffer;*ch != '\0';ch++) {
  89         if (!isalnum(*ch))
  90             *ch = '_';
  91     }
  92
  93     strcat(buffer, "_LTX_");
  94     strcat(buffer, symbol);
  95
  96     res = lt_dlsym_fn(handle, buffer);
  97
  98     pa_xfree(buffer);
  99
 100     return res;
 101 }
 102
 103 pa_module* pa_module_load(pa_core *c, const char *name, const char *argument) {
 104     pa_module *m = NULL;
 105     int r;
 106
 107     assert(c && name);
 108
 109     if (c->disallow_module_loading)
 110         goto fail;
 111
 112     m = pa_xmalloc(sizeof(pa_module));
 113
 114     m->name = pa_xstrdup(name);
 115     m->argument = pa_xstrdup(argument);
 116
 117     if (!(m->dl = lt_dlopenext(name))) {
 118         pa_log("Failed to open module \"%s\": %s", name, lt_dlerror());
 119         goto fail;
 120     }
 121
 122     if (!(m->init = (int (*)(pa_core *_c, pa_module*_m)) load_sym(m->dl, name, PA_SYMBOL_INIT))) {
 123         pa_log("Failed to load module \"%s\": symbol \""PA_SYMBOL_INIT"\" not found.", name);
 124         goto fail;
 125     }
 126
 127     if (!(m->done = (void (*)(pa_core *_c, pa_module*_m)) load_sym(m->dl, name, PA_SYMBOL_DONE))) {
 128         pa_log("Failed to load module \"%s\": symbol \""PA_SYMBOL_DONE"\" not found.", name);
 129         goto fail;
 130     }
 131
 132     m->userdata = NULL;
 133     m->core = c;
 134     m->n_used = -1;
 135     m->auto_unload = 0;
 136     m->unload_requested = 0;
 137
 138     assert(m->init);
 139     if (m->init(c, m) < 0) {
 140         pa_log_error("Failed to load  module \"%s\" (argument: \"%s\"): initialization failed.", name, argument ? argument : "");
 141         goto fail;
 142     }
 143
 144     if (!c->modules)
 145         c->modules = pa_idxset_new(NULL, NULL);
 146
 147     if (!c->module_auto_unload_event) {
 148         struct timeval ntv;
 149         pa_gettimeofday(&ntv);
 150         ntv.tv_sec += UNLOAD_POLL_TIME;
 151         c->module_auto_unload_event = c->mainloop->time_new(c->mainloop, &ntv, timeout_callback, c);
 152     }
 153     assert(c->module_auto_unload_event);
 154
 155     assert(c->modules);
 156     r = pa_idxset_put(c->modules, m, &m->index);
 157     assert(r >= 0 && m->index != PA_IDXSET_INVALID);
 158
 159     pa_log_info("Loaded \"%s\" (index: #%u; argument: \"%s\").", m->name, m->index, m->argument ? m->argument : "");
 160
 161     pa_subscription_post(c, PA_SUBSCRIPTION_EVENT_MODULE|PA_SUBSCRIPTION_EVENT_NEW, m->index);
 162
 163     return m;
 164
 165 fail:
 166
 167     if (m) {
 168         pa_xfree(m->argument);
 169         pa_xfree(m->name);
 170
 171         if (m->dl)
 172             lt_dlclose(m->dl);
 173
 174         pa_xfree(m);
 175     }
 176
 177     return NULL;
 178 }
 179
 180 static void pa_module_free(pa_module *m) {
 181     assert(m && m->done && m->core);
 182
 183     if (m->core->disallow_module_loading)
 184         return;
 185
 186     pa_log_info("Unloading \"%s\" (index: #%u).", m->name, m->index);
 187
 188     m->done(m->core, m);
 189
 190     lt_dlclose(m->dl);
 191
 192     pa_log_info("Unloaded \"%s\" (index: #%u).", m->name, m->index);
 193
 194     pa_subscription_post(m->core, PA_SUBSCRIPTION_EVENT_MODULE|PA_SUBSCRIPTION_EVENT_REMOVE, m->index);
 195
 196     pa_xfree(m->name);
 197     pa_xfree(m->argument);
 198     pa_xfree(m);
 199 }
 200
 201 void pa_module_unload(pa_core *c, pa_module *m) {
 202     assert(c && m);
 203
 204     assert(c->modules);
 205     if (!(m = pa_idxset_remove_by_data(c->modules, m, NULL)))
 206         return;
 207
 208     pa_module_free(m);
 209 }
 210
 211 void pa_module_unload_by_index(pa_core *c, uint32_t idx) {
 212     pa_module *m;
 213     assert(c && idx != PA_IDXSET_INVALID);
 214
 215     assert(c->modules);
 216     if (!(m = pa_idxset_remove_by_index(c->modules, idx)))
 217         return;
 218
 219     pa_module_free(m);
 220 }
 221
 222 static void free_callback(void *p, PA_GCC_UNUSED void *userdata) {
 223     pa_module *m = p;
 224     assert(m);
 225     pa_module_free(m);
 226 }
 227
 228 void pa_module_unload_all(pa_core *c) {
 229     pa_module *m;
 230     assert(c);
 231
 232     if (!c->modules)
 233         return;
 234
 235     while ((m = pa_idxset_first(c->modules, NULL)))
 236         pa_module_unload(c, m);
 237
 238     pa_idxset_free(c->modules, free_callback, NULL);
 239     c->modules = NULL;
 240
 241     if (c->module_auto_unload_event) {
 242         c->mainloop->time_free(c->module_auto_unload_event);
 243         c->module_auto_unload_event = NULL;
 244     }
 245
 246     if (c->module_defer_unload_event) {
 247         c->mainloop->defer_free(c->module_defer_unload_event);
 248         c->module_defer_unload_event = NULL;
 249     }
 250 }
 251
 252 static int unused_callback(void *p, PA_GCC_UNUSED uint32_t idx, int *del, void *userdata) {
 253     pa_module *m = p;
 254     time_t *now = userdata;
 255     assert(p && del && now);
 256
 257     if (m->n_used == 0 && m->auto_unload && m->last_used_time+m->core->module_idle_time <= *now) {
 258         pa_module_free(m);
 259         *del = 1;
 260     }
 261
 262     return 0;
 263 }
 264
 265 void pa_module_unload_unused(pa_core *c) {
 266     time_t now;
 267     assert(c);
 268
 269     if (!c->modules)
 270         return;
 271
 272     time(&now);
 273     pa_idxset_foreach(c->modules, unused_callback, &now);
 274 }
 275
 276 static int unload_callback(void *p, PA_GCC_UNUSED uint32_t idx, int *del, PA_GCC_UNUSED void *userdata) {
 277     pa_module *m = p;
 278     assert(m);
 279
 280     if (m->unload_requested) {
 281         pa_module_free(m);
 282         *del = 1;
 283     }
 284
 285     return 0;
 286 }
 287
 288 static void defer_cb(pa_mainloop_api*api, pa_defer_event *e, void *userdata) {
 289     pa_core *core = userdata;
 290     api->defer_enable(e, 0);
 291
 292     if (!core->modules)
 293         return;
 294
 295     pa_idxset_foreach(core->modules, unload_callback, NULL);
 296
 297 }
 298
 299 void pa_module_unload_request(pa_module *m) {
 300     assert(m);
 301
 302     m->unload_requested = 1;
 303
 304     if (!m->core->module_defer_unload_event)
 305         m->core->module_defer_unload_event = m->core->mainloop->defer_new(m->core->mainloop, defer_cb, m->core);
 306
 307     m->core->mainloop->defer_enable(m->core->module_defer_unload_event, 1);
 308 }
 309
 310 void pa_module_set_used(pa_module*m, int used) {
 311     assert(m);
 312
 313     if (m->n_used != used)
 314         pa_subscription_post(m->core, PA_SUBSCRIPTION_EVENT_MODULE|PA_SUBSCRIPTION_EVENT_CHANGE, m->index);
 315
 316     if (m->n_used != used && used == 0)
 317         time(&m->last_used_time);
 318
 319     m->n_used = used;
 320 }
 321
 322 pa_modinfo *pa_module_get_info(pa_module *m) {
 323     assert(m);
 324
 325     return pa_modinfo_get_by_handle(m->dl);
 326 }