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

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