code.delx.au - pulseaudio/blob - src/modules/gconf/module-gconf.c

   1 /***
   2   This file is part of PulseAudio.
   3
   4   Copyright 2006 Lennart Poettering
   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 <string.h>
  27 #include <unistd.h>
  28 #include <stdlib.h>
  29 #include <errno.h>
  30 #include <signal.h>
  31 #include <sys/types.h>
  32 #include <sys/wait.h>
  33 #include <fcntl.h>
  34
  35 #include <pulse/xmalloc.h>
  36 #include <pulsecore/module.h>
  37 #include <pulsecore/core.h>
  38 #include <pulsecore/llist.h>
  39 #include <pulsecore/core-util.h>
  40 #include <pulsecore/log.h>
  41 #include <pulse/mainloop-api.h>
  42 #include <pulsecore/core-error.h>
  43 #include <pulsecore/start-child.h>
  44
  45 #include "module-gconf-symdef.h"
  46
  47 PA_MODULE_AUTHOR("Lennart Poettering");
  48 PA_MODULE_DESCRIPTION("GConf Adapter");
  49 PA_MODULE_VERSION(PACKAGE_VERSION);
  50 PA_MODULE_LOAD_ONCE(TRUE);
  51
  52 #define MAX_MODULES 10
  53 #define BUF_MAX 2048
  54
  55 /* #undef PA_GCONF_HELPER */
  56 /* #define PA_GCONF_HELPER "/home/lennart/projects/pulseaudio/src/gconf-helper" */
  57
  58 struct module_item {
  59     char *name;
  60     char *args;
  61     uint32_t index;
  62 };
  63
  64 struct module_info {
  65     char *name;
  66
  67     struct module_item items[MAX_MODULES];
  68     unsigned n_items;
  69 };
  70
  71 struct userdata {
  72     pa_core *core;
  73     pa_module *module;
  74
  75     pa_hashmap *module_infos;
  76
  77     pid_t pid;
  78
  79     int fd;
  80     int fd_type;
  81     pa_io_event *io_event;
  82
  83     char buf[BUF_MAX];
  84     size_t buf_fill;
  85 };
  86
  87 static int fill_buf(struct userdata *u) {
  88     ssize_t r;
  89     pa_assert(u);
  90
  91     if (u->buf_fill >= BUF_MAX) {
  92         pa_log("read buffer overflow");
  93         return -1;
  94     }
  95
  96     if ((r = pa_read(u->fd, u->buf + u->buf_fill, BUF_MAX - u->buf_fill, &u->fd_type)) <= 0)
  97         return -1;
  98
  99     u->buf_fill += r;
 100     return 0;
 101 }
 102
 103 static int read_byte(struct userdata *u) {
 104     int ret;
 105     pa_assert(u);
 106
 107     if (u->buf_fill < 1)
 108         if (fill_buf(u) < 0)
 109             return -1;
 110
 111     ret = u->buf[0];
 112     pa_assert(u->buf_fill > 0);
 113     u->buf_fill--;
 114     memmove(u->buf, u->buf+1, u->buf_fill);
 115     return ret;
 116 }
 117
 118 static char *read_string(struct userdata *u) {
 119     pa_assert(u);
 120
 121     for (;;) {
 122         char *e;
 123
 124         if ((e = memchr(u->buf, 0, u->buf_fill))) {
 125             char *ret = pa_xstrdup(u->buf);
 126             u->buf_fill -= e - u->buf +1;
 127             memmove(u->buf, e+1, u->buf_fill);
 128             return ret;
 129         }
 130
 131         if (fill_buf(u) < 0)
 132             return NULL;
 133     }
 134 }
 135
 136 static void unload_one_module(struct userdata *u, struct module_info*m, unsigned i) {
 137     pa_assert(u);
 138     pa_assert(m);
 139     pa_assert(i < m->n_items);
 140
 141     if (m->items[i].index == PA_INVALID_INDEX)
 142         return;
 143
 144     pa_log_debug("Unloading module #%i", m->items[i].index);
 145     pa_module_unload_by_index(u->core, m->items[i].index);
 146     m->items[i].index = PA_INVALID_INDEX;
 147     pa_xfree(m->items[i].name);
 148     pa_xfree(m->items[i].args);
 149     m->items[i].name = m->items[i].args = NULL;
 150 }
 151
 152 static void unload_all_modules(struct userdata *u, struct module_info*m) {
 153     unsigned i;
 154
 155     pa_assert(u);
 156     pa_assert(m);
 157
 158     for (i = 0; i < m->n_items; i++)
 159         unload_one_module(u, m, i);
 160
 161     m->n_items = 0;
 162 }
 163
 164 static void load_module(
 165         struct userdata *u,
 166         struct module_info *m,
 167         int i,
 168         const char *name,
 169         const char *args,
 170         int is_new) {
 171
 172     pa_module *mod;
 173
 174     pa_assert(u);
 175     pa_assert(m);
 176     pa_assert(name);
 177     pa_assert(args);
 178
 179     if (!is_new) {
 180         if (m->items[i].index != PA_INVALID_INDEX &&
 181             strcmp(m->items[i].name, name) == 0 &&
 182             strcmp(m->items[i].args, args) == 0)
 183             return;
 184
 185         unload_one_module(u, m, i);
 186     }
 187
 188     pa_log_debug("Loading module '%s' with args '%s' due to GConf configuration.", name, args);
 189
 190     m->items[i].name = pa_xstrdup(name);
 191     m->items[i].args = pa_xstrdup(args);
 192     m->items[i].index = PA_INVALID_INDEX;
 193
 194     if (!(mod = pa_module_load(u->core, name, args))) {
 195         pa_log("pa_module_load() failed");
 196         return;
 197     }
 198
 199     m->items[i].index = mod->index;
 200 }
 201
 202 static void module_info_free(void *p, void *userdata) {
 203     struct module_info *m = p;
 204     struct userdata *u = userdata;
 205
 206     pa_assert(m);
 207     pa_assert(u);
 208
 209     unload_all_modules(u, m);
 210     pa_xfree(m->name);
 211     pa_xfree(m);
 212 }
 213
 214 static int handle_event(struct userdata *u) {
 215     int opcode;
 216     int ret = 0;
 217
 218     do {
 219         if ((opcode = read_byte(u)) < 0){
 220             if (errno == EINTR || errno == EAGAIN)
 221                 break;
 222             goto fail;
 223         }
 224
 225         switch (opcode) {
 226             case '!':
 227                 /* The helper tool is now initialized */
 228                 ret = 1;
 229                 break;
 230
 231             case '+': {
 232                 char *name;
 233                 struct module_info *m;
 234                 unsigned i, j;
 235
 236                 if (!(name = read_string(u)))
 237                     goto fail;
 238
 239                 if (!(m = pa_hashmap_get(u->module_infos, name))) {
 240                     m = pa_xnew(struct module_info, 1);
 241                     m->name = name;
 242                     m->n_items = 0;
 243                     pa_hashmap_put(u->module_infos, m->name, m);
 244                 } else
 245                     pa_xfree(name);
 246
 247                 i = 0;
 248                 while (i < MAX_MODULES) {
 249                     char *module, *args;
 250
 251                     if (!(module = read_string(u))) {
 252                         if (i > m->n_items) m->n_items = i;
 253                         goto fail;
 254                     }
 255
 256                     if (!*module) {
 257                         pa_xfree(module);
 258                         break;
 259                     }
 260
 261                     if (!(args = read_string(u))) {
 262                         pa_xfree(module);
 263
 264                         if (i > m->n_items) m->n_items = i;
 265                         goto fail;
 266                     }
 267
 268                     load_module(u, m, i, module, args, i >= m->n_items);
 269
 270                     i++;
 271
 272                     pa_xfree(module);
 273                     pa_xfree(args);
 274                 }
 275
 276                 /* Unload all removed modules */
 277                 for (j = i; j < m->n_items; j++)
 278                     unload_one_module(u, m, j);
 279
 280                 m->n_items = i;
 281
 282                 break;
 283             }
 284
 285             case '-': {
 286                 char *name;
 287                 struct module_info *m;
 288
 289                 if (!(name = read_string(u)))
 290                     goto fail;
 291
 292                 if ((m = pa_hashmap_get(u->module_infos, name))) {
 293                     pa_hashmap_remove(u->module_infos, name);
 294                     module_info_free(m, u);
 295                 }
 296
 297                 pa_xfree(name);
 298
 299                 break;
 300             }
 301         }
 302     } while (u->buf_fill > 0 && ret == 0);
 303
 304     return ret;
 305
 306 fail:
 307     pa_log("Unable to read or parse data from client.");
 308     return -1;
 309 }
 310
 311 static void io_event_cb(
 312         pa_mainloop_api*a,
 313         pa_io_event* e,
 314         int fd,
 315         pa_io_event_flags_t events,
 316         void *userdata) {
 317
 318     struct userdata *u = userdata;
 319
 320     if (handle_event(u) < 0) {
 321
 322         if (u->io_event) {
 323             u->core->mainloop->io_free(u->io_event);
 324             u->io_event = NULL;
 325         }
 326
 327         pa_module_unload_request(u->module);
 328     }
 329 }
 330
 331 int pa__init(pa_module*m) {
 332     struct userdata *u;
 333     int r;
 334
 335     u = pa_xnew(struct userdata, 1);
 336     u->core = m->core;
 337     u->module = m;
 338     m->userdata = u;
 339     u->module_infos = pa_hashmap_new(pa_idxset_string_hash_func, pa_idxset_string_compare_func);
 340     u->pid = (pid_t) -1;
 341     u->fd = -1;
 342     u->fd_type = 0;
 343     u->io_event = NULL;
 344     u->buf_fill = 0;
 345
 346     if ((u->fd = pa_start_child_for_read(PA_GCONF_HELPER, NULL, &u->pid)) < 0)
 347         goto fail;
 348
 349     u->io_event = m->core->mainloop->io_new(
 350             m->core->mainloop,
 351             u->fd,
 352             PA_IO_EVENT_INPUT,
 353             io_event_cb,
 354             u);
 355
 356     do {
 357         if ((r = handle_event(u)) < 0)
 358             goto fail;
 359
 360         /* Read until the client signalled us that it is ready with
 361          * initialization */
 362     } while (r != 1);
 363
 364     return 0;
 365
 366 fail:
 367     pa__done(m);
 368     return -1;
 369 }
 370
 371 void pa__done(pa_module*m) {
 372     struct userdata *u;
 373
 374     pa_assert(m);
 375
 376     if (!(u = m->userdata))
 377         return;
 378
 379     if (u->pid != (pid_t) -1) {
 380         kill(u->pid, SIGTERM);
 381         waitpid(u->pid, NULL, 0);
 382     }
 383
 384     if (u->io_event)
 385         m->core->mainloop->io_free(u->io_event);
 386
 387     if (u->fd >= 0)
 388         pa_close(u->fd);
 389
 390
 391     if (u->module_infos)
 392         pa_hashmap_free(u->module_infos, module_info_free, u);
 393
 394     pa_xfree(u);
 395 }