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

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of PulseAudio.
   5
   6   Copyright 2006 Lennart Poettering
   7
   8   PulseAudio is free software; you can redistribute it and/or modify
   9   it under the terms of the GNU Lesser General Public License as published
  10   by the Free Software Foundation; either version 2 of the License,
  11   or (at your option) any later version.
  12
  13   PulseAudio is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with PulseAudio; if not, write to the Free Software
  20   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  21   USA.
  22 ***/
  23
  24 #ifdef HAVE_CONFIG_H
  25 #include <config.h>
  26 #endif
  27
  28 #include <string.h>
  29 #include <unistd.h>
  30 #include <stdlib.h>
  31 #include <errno.h>
  32 #include <signal.h>
  33 #include <sys/types.h>
  34 #include <sys/wait.h>
  35 #include <fcntl.h>
  36
  37 #include <pulse/xmalloc.h>
  38 #include <pulsecore/module.h>
  39 #include <pulsecore/core.h>
  40 #include <pulsecore/llist.h>
  41 #include <pulsecore/core-util.h>
  42 #include <pulsecore/log.h>
  43 #include <pulse/mainloop-api.h>
  44 #include <pulsecore/core-error.h>
  45 #include <pulsecore/start-child.h>
  46
  47 #include "module-gconf-symdef.h"
  48
  49 PA_MODULE_AUTHOR("Lennart Poettering");
  50 PA_MODULE_DESCRIPTION("GConf Adapter");
  51 PA_MODULE_VERSION(PACKAGE_VERSION);
  52 PA_MODULE_LOAD_ONCE(TRUE);
  53
  54 #define MAX_MODULES 10
  55 #define BUF_MAX 2048
  56
  57 /* #undef PA_GCONF_HELPER */
  58 /* #define PA_GCONF_HELPER "/home/lennart/projects/pulseaudio/src/gconf-helper" */
  59
  60 struct module_item {
  61     char *name;
  62     char *args;
  63     uint32_t index;
  64 };
  65
  66 struct module_info {
  67     char *name;
  68
  69     struct module_item items[MAX_MODULES];
  70     unsigned n_items;
  71 };
  72
  73 struct userdata {
  74     pa_core *core;
  75     pa_module *module;
  76
  77     pa_hashmap *module_infos;
  78
  79     pid_t pid;
  80
  81     int fd;
  82     int fd_type;
  83     pa_io_event *io_event;
  84
  85     char buf[BUF_MAX];
  86     size_t buf_fill;
  87 };
  88
  89 static int fill_buf(struct userdata *u) {
  90     ssize_t r;
  91     pa_assert(u);
  92
  93     if (u->buf_fill >= BUF_MAX) {
  94         pa_log("read buffer overflow");
  95         return -1;
  96     }
  97
  98     if ((r = pa_read(u->fd, u->buf + u->buf_fill, BUF_MAX - u->buf_fill, &u->fd_type)) <= 0)
  99         return -1;
 100
 101     u->buf_fill += r;
 102     return 0;
 103 }
 104
 105 static int read_byte(struct userdata *u) {
 106     int ret;
 107     pa_assert(u);
 108
 109     if (u->buf_fill < 1)
 110         if (fill_buf(u) < 0)
 111             return -1;
 112
 113     ret = u->buf[0];
 114     pa_assert(u->buf_fill > 0);
 115     u->buf_fill--;
 116     memmove(u->buf, u->buf+1, u->buf_fill);
 117     return ret;
 118 }
 119
 120 static char *read_string(struct userdata *u) {
 121     pa_assert(u);
 122
 123     for (;;) {
 124         char *e;
 125
 126         if ((e = memchr(u->buf, 0, u->buf_fill))) {
 127             char *ret = pa_xstrdup(u->buf);
 128             u->buf_fill -= e - u->buf +1;
 129             memmove(u->buf, e+1, u->buf_fill);
 130             return ret;
 131         }
 132
 133         if (fill_buf(u) < 0)
 134             return NULL;
 135     }
 136 }
 137
 138 static void unload_one_module(struct userdata *u, struct module_info*m, unsigned i) {
 139     pa_assert(u);
 140     pa_assert(m);
 141     pa_assert(i < m->n_items);
 142
 143     if (m->items[i].index == PA_INVALID_INDEX)
 144         return;
 145
 146     pa_log_debug("Unloading module #%i", m->items[i].index);
 147     pa_module_unload_by_index(u->core, m->items[i].index);
 148     m->items[i].index = PA_INVALID_INDEX;
 149     pa_xfree(m->items[i].name);
 150     pa_xfree(m->items[i].args);
 151     m->items[i].name = m->items[i].args = NULL;
 152 }
 153
 154 static void unload_all_modules(struct userdata *u, struct module_info*m) {
 155     unsigned i;
 156
 157     pa_assert(u);
 158     pa_assert(m);
 159
 160     for (i = 0; i < m->n_items; i++)
 161         unload_one_module(u, m, i);
 162
 163     m->n_items = 0;
 164 }
 165
 166 static void load_module(
 167         struct userdata *u,
 168         struct module_info *m,
 169         int i,
 170         const char *name,
 171         const char *args,
 172         int is_new) {
 173
 174     pa_module *mod;
 175
 176     pa_assert(u);
 177     pa_assert(m);
 178     pa_assert(name);
 179     pa_assert(args);
 180
 181     if (!is_new) {
 182         if (m->items[i].index != PA_INVALID_INDEX &&
 183             strcmp(m->items[i].name, name) == 0 &&
 184             strcmp(m->items[i].args, args) == 0)
 185             return;
 186
 187         unload_one_module(u, m, i);
 188     }
 189
 190     pa_log_debug("Loading module '%s' with args '%s' due to GConf configuration.", name, args);
 191
 192     m->items[i].name = pa_xstrdup(name);
 193     m->items[i].args = pa_xstrdup(args);
 194     m->items[i].index = PA_INVALID_INDEX;
 195
 196     if (!(mod = pa_module_load(u->core, name, args))) {
 197         pa_log("pa_module_load() failed");
 198         return;
 199     }
 200
 201     m->items[i].index = mod->index;
 202 }
 203
 204 static void module_info_free(void *p, void *userdata) {
 205     struct module_info *m = p;
 206     struct userdata *u = userdata;
 207
 208     pa_assert(m);
 209     pa_assert(u);
 210
 211     unload_all_modules(u, m);
 212     pa_xfree(m->name);
 213     pa_xfree(m);
 214 }
 215
 216 static int handle_event(struct userdata *u) {
 217     int opcode;
 218     int ret = 0;
 219
 220     do {
 221         if ((opcode = read_byte(u)) < 0){
 222             if (errno == EINTR || errno == EAGAIN)
 223                 break;
 224             goto fail;
 225         }
 226
 227         switch (opcode) {
 228             case '!':
 229                 /* The helper tool is now initialized */
 230                 ret = 1;
 231                 break;
 232
 233             case '+': {
 234                 char *name;
 235                 struct module_info *m;
 236                 unsigned i, j;
 237
 238                 if (!(name = read_string(u)))
 239                     goto fail;
 240
 241                 if (!(m = pa_hashmap_get(u->module_infos, name))) {
 242                     m = pa_xnew(struct module_info, 1);
 243                     m->name = name;
 244                     m->n_items = 0;
 245                     pa_hashmap_put(u->module_infos, m->name, m);
 246                 } else
 247                     pa_xfree(name);
 248
 249                 i = 0;
 250                 while (i < MAX_MODULES) {
 251                     char *module, *args;
 252
 253                     if (!(module = read_string(u))) {
 254                         if (i > m->n_items) m->n_items = i;
 255                         goto fail;
 256                     }
 257
 258                     if (!*module) {
 259                         pa_xfree(module);
 260                         break;
 261                     }
 262
 263                     if (!(args = read_string(u))) {
 264                         pa_xfree(module);
 265
 266                         if (i > m->n_items) m->n_items = i;
 267                         goto fail;
 268                     }
 269
 270                     load_module(u, m, i, module, args, i >= m->n_items);
 271
 272                     i++;
 273
 274                     pa_xfree(module);
 275                     pa_xfree(args);
 276                 }
 277
 278                 /* Unload all removed modules */
 279                 for (j = i; j < m->n_items; j++)
 280                     unload_one_module(u, m, j);
 281
 282                 m->n_items = i;
 283
 284                 break;
 285             }
 286
 287             case '-': {
 288                 char *name;
 289                 struct module_info *m;
 290
 291                 if (!(name = read_string(u)))
 292                     goto fail;
 293
 294                 if ((m = pa_hashmap_get(u->module_infos, name))) {
 295                     pa_hashmap_remove(u->module_infos, name);
 296                     module_info_free(m, u);
 297                 }
 298
 299                 pa_xfree(name);
 300
 301                 break;
 302             }
 303         }
 304     } while (u->buf_fill > 0 && ret == 0);
 305
 306     return ret;
 307
 308 fail:
 309     pa_log("Unable to read or parse data from client.");
 310     return -1;
 311 }
 312
 313 static void io_event_cb(
 314         pa_mainloop_api*a,
 315         pa_io_event* e,
 316         int fd,
 317         pa_io_event_flags_t events,
 318         void *userdata) {
 319
 320     struct userdata *u = userdata;
 321
 322     if (handle_event(u) < 0) {
 323
 324         if (u->io_event) {
 325             u->core->mainloop->io_free(u->io_event);
 326             u->io_event = NULL;
 327         }
 328
 329         pa_module_unload_request(u->module);
 330     }
 331 }
 332
 333 int pa__init(pa_module*m) {
 334     struct userdata *u;
 335     int r;
 336
 337     u = pa_xnew(struct userdata, 1);
 338     u->core = m->core;
 339     u->module = m;
 340     m->userdata = u;
 341     u->module_infos = pa_hashmap_new(pa_idxset_string_hash_func, pa_idxset_string_compare_func);
 342     u->pid = (pid_t) -1;
 343     u->fd = -1;
 344     u->fd_type = 0;
 345     u->io_event = NULL;
 346     u->buf_fill = 0;
 347
 348     if ((u->fd = pa_start_child_for_read(PA_GCONF_HELPER, NULL, &u->pid)) < 0)
 349         goto fail;
 350
 351     u->io_event = m->core->mainloop->io_new(
 352             m->core->mainloop,
 353             u->fd,
 354             PA_IO_EVENT_INPUT,
 355             io_event_cb,
 356             u);
 357
 358     do {
 359         if ((r = handle_event(u)) < 0)
 360             goto fail;
 361
 362         /* Read until the client signalled us that it is ready with
 363          * initialization */
 364     } while (r != 1);
 365
 366     return 0;
 367
 368 fail:
 369     pa__done(m);
 370     return -1;
 371 }
 372
 373 void pa__done(pa_module*m) {
 374     struct userdata *u;
 375
 376     pa_assert(m);
 377
 378     if (!(u = m->userdata))
 379         return;
 380
 381     if (u->pid != (pid_t) -1) {
 382         kill(u->pid, SIGTERM);
 383         waitpid(u->pid, NULL, 0);
 384     }
 385
 386     if (u->io_event)
 387         m->core->mainloop->io_free(u->io_event);
 388
 389     if (u->fd >= 0)
 390         pa_close(u->fd);
 391
 392
 393     if (u->module_infos)
 394         pa_hashmap_free(u->module_infos, module_info_free, u);
 395
 396     pa_xfree(u);
 397 }